Context:
/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.test.api.task;

import static java.util.Arrays.asList;
import static java.util.Collections.emptyList;
import static java.util.Collections.emptyMap;
import static java.util.Collections.singletonList;
import static java.util.Collections.singletonMap;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;

import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.ActivitiOptimisticLockingException;
import org.activiti.engine.ActivitiTaskAlreadyClaimedException;
import org.activiti.engine.history.HistoricActivityInstance;
import org.activiti.engine.history.HistoricDetail;
import org.activiti.engine.history.HistoricTaskInstance;
import org.activiti.engine.history.HistoricVariableUpdate;
import org.activiti.engine.impl.TaskServiceImpl;
import org.activiti.engine.impl.history.HistoryLevel;
import org.activiti.engine.impl.identity.Authentication;
import org.activiti.engine.impl.persistence.entity.CommentEntity;
import org.activiti.engine.impl.persistence.entity.HistoricDetailVariableInstanceUpdateEntity;
import org.activiti.engine.impl.test.PluggableActivitiTestCase;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Attachment;
import org.activiti.engine.task.Comment;
import org.activiti.engine.task.DelegationState;
import org.activiti.engine.task.Event;
import org.activiti.engine.task.IdentityLink;
import org.activiti.engine.task.IdentityLinkType;
import org.activiti.engine.task.Task;
import org.activiti.engine.test.Deployment;

public class TaskServiceTest extends PluggableActivitiTestCase {

    public void testSaveTaskUpdate() throws Exception {

        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss");
        Task task = taskService.newTask();
        task.setDescription("description");
        task.setName("taskname");
        task.setPriority(0);
        task.setAssignee("taskassignee");
        task.setOwner("taskowner");
        Date dueDate = sdf.parse("01/02/2003 04:05:06");
        task.setDueDate(dueDate);
        taskService.saveTask(task);

        // Fetch the task again and update
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getDescription()).isEqualTo("description");
        assertThat(task.getName()).isEqualTo("taskname");
        assertThat(task.getAssignee()).isEqualTo("taskassignee");
        assertThat(task.getOwner()).isEqualTo("taskowner");
        assertThat(task.getDueDate()).isEqualTo(dueDate);
        assertThat(task.getPriority()).isEqualTo(0);

        task.setName("updatedtaskname");
        task.setDescription("updateddescription");
        task.setPriority(1);
        task.setAssignee("updatedassignee");
        task.setOwner("updatedowner");
        dueDate = sdf.parse("01/02/2003 04:05:06");
        task.setDueDate(dueDate);
        taskService.saveTask(task);

        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getName()).isEqualTo("updatedtaskname");
        assertThat(task.getDescription()).isEqualTo("updateddescription");
        assertThat(task.getAssignee()).isEqualTo("updatedassignee");
        assertThat(task.getOwner()).isEqualTo("updatedowner");
        assertThat(task.getDueDate()).isEqualTo(dueDate);
        assertThat(task.getPriority()).isEqualTo(1);

        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.AUDIT)) {
            HistoricTaskInstance historicTaskInstance = historyService.createHistoricTaskInstanceQuery().taskId(task.getId()).singleResult();
            assertThat(historicTaskInstance.getName()).isEqualTo("updatedtaskname");
            assertThat(historicTaskInstance.getDescription()).isEqualTo("updateddescription");
            assertThat(historicTaskInstance.getAssignee()).isEqualTo("updatedassignee");
            assertThat(historicTaskInstance.getOwner()).isEqualTo("updatedowner");
            assertThat(historicTaskInstance.getDueDate()).isEqualTo(dueDate);
            assertThat(historicTaskInstance.getPriority()).isEqualTo(1);
        }

        // Finally, delete task
        taskService.deleteTask(task.getId(), true);
    }

    public void testTaskOwner() {
        Task task = taskService.newTask();
        task.setOwner("johndoe");
        taskService.saveTask(task);

        // Fetch the task again and update
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getOwner()).isEqualTo("johndoe");

        task.setOwner("joesmoe");
        taskService.saveTask(task);

        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getOwner()).isEqualTo("joesmoe");

        // Finally, delete task
        taskService.deleteTask(task.getId(), true);
    }

    public void testTaskComments() {
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.ACTIVITY)) {
            Task task = taskService.newTask();
            task.setOwner("johndoe");
            taskService.saveTask(task);
            String taskId = task.getId();

            Authentication.setAuthenticatedUserId("johndoe");
            // Fetch the task again and update
            taskService
                    .addComment(
                            taskId,
                            null,
                            "look at this \n       isn't this great? slkdjf sldkfjs ldkfjs ldkfjs ldkfj sldkfj sldkfj sldkjg laksfg sdfgsd;flgkj ksajdhf skjdfh ksjdhf skjdhf kalskjgh lskh dfialurhg kajsh dfuieqpgkja rzvkfnjviuqerhogiuvysbegkjz lkhf ais liasduh flaisduh ajiasudh vaisudhv nsfd");
            Comment comment = taskService.getTaskComments(taskId).get(0);
            assertThat(comment.getUserId()).isEqualTo("johndoe");
            assertThat(comment.getTaskId()).isEqualTo(taskId);
            assertThat(comment.getProcessInstanceId()).isNull();
            assertThat(((Event) comment).getMessage())
                .isEqualTo("look at this isn't this great? slkdjf sldkfjs ldkfjs ldkfjs ldkfj sldkfj sldkfj sldkjg laksfg sdfgsd;flgkj ksajdhf skjdfh ksjdhf skjdhf kalskjgh lskh dfialurhg ...");
            assertThat(comment.getFullMessage())
                .isEqualTo("look at this \n       isn't this great? slkdjf sldkfjs ldkfjs ldkfjs ldkfj sldkfj sldkfj sldkjg laksfg sdfgsd;flgkj ksajdhf skjdfh ksjdhf skjdhf kalskjgh lskh dfialurhg kajsh dfuieqpgkja rzvkfnjviuqerhogiuvysbegkjz lkhf ais liasduh flaisduh ajiasudh vaisudhv nsfd");
            assertThat(comment.getTime()).isNotNull();

            // Finally, delete task
            taskService.deleteTask(taskId, true);
        }
    }

    public void testCustomTaskComments() {
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.ACTIVITY)) {
            Task task = taskService.newTask();
            task.setOwner("johndoe");
            taskService.saveTask(task);
            String taskId = task.getId();

            Authentication.setAuthenticatedUserId("johndoe");
            String customType1 = "Type1";
            String customType2 = "Type2";

            Comment comment = taskService.addComment(taskId,
                                                     null,
                                                     "This is a regular comment");
            Comment customComment1 = taskService.addComment(taskId,
                                                            null,
                                                            customType1,
                                                            "This is a custom comment of type Type1");
            Comment customComment2 = taskService.addComment(taskId,
                                                            null,
                                                            customType1,
                                                            "This is another Type1 comment");
            Comment customComment3 = taskService.addComment(taskId,
                                                            null,
                                                            customType2,
                                                            "This is another custom comment. Type2 this time!");

            assertThat(comment.getType()).isEqualTo(CommentEntity.TYPE_COMMENT);
            assertThat(customComment1.getType()).isEqualTo(customType1);
            assertThat(customComment3.getType()).isEqualTo(customType2);

            assertThat(taskService.getComment(comment.getId())).isNotNull();
            assertThat(taskService.getComment(customComment1.getId())).isNotNull();

            List<Comment> regularComments = taskService.getTaskComments(taskId);
            assertThat(regularComments).hasSize(1);
            assertThat(regularComments.get(0).getFullMessage()).isEqualTo("This is a regular comment");

            List<Event> allComments = taskService.getTaskEvents(taskId);
            assertThat(allComments).hasSize(4);

            List<Comment> type2Comments = taskService.getCommentsByType(customType2);
            assertThat(type2Comments).hasSize(1);
            assertThat(type2Comments.get(0).getFullMessage()).isEqualTo("This is another custom comment. Type2 this time!");

            List<Comment> taskTypeComments = taskService.getTaskComments(taskId, customType1);
            assertThat(taskTypeComments).hasSize(2);

            // Clean up
            taskService.deleteTask(taskId, true);
        }
    }

    public void testTaskAttachments() {
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.ACTIVITY)) {
            Task task = taskService.newTask();
            task.setOwner("johndoe");
            taskService.saveTask(task);
            String taskId = task.getId();
            Authentication.setAuthenticatedUserId("johndoe");
            // Fetch the task again and update
            taskService.createAttachment("web page",
                                         taskId,
                                         null,
                                         "weatherforcast",
                                         "temperatures and more",
                                         "http://weather.com");
            Attachment attachment = taskService.getTaskAttachments(taskId).get(0);
            assertThat(attachment.getName()).isEqualTo("weatherforcast");
            assertThat(attachment.getDescription()).isEqualTo("temperatures and more");
            assertThat(attachment.getType()).isEqualTo("web page");
            assertThat(attachment.getTaskId()).isEqualTo(taskId);
            assertThat(attachment.getProcessInstanceId()).isNull();
            assertThat(attachment.getUrl()).isEqualTo("http://weather.com");
            assertThat(taskService.getAttachmentContent(attachment.getId())).isNull();

            // Finally, clean up
            taskService.deleteTask(taskId);

            assertThat(taskService.getTaskComments(taskId)).hasSize(0);
            assertThat(historyService.createHistoricTaskInstanceQuery().taskId(taskId).list()).hasSize(1);

            taskService.deleteTask(taskId,
                                   true);
        }
    }

    public void testSaveTaskAttachment() {
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.ACTIVITY)) {
            Task task = taskService.newTask();
            task.setOwner("johndoe");
            taskService.saveTask(task);
            String taskId = task.getId();
            Authentication.setAuthenticatedUserId("johndoe");

            // Fetch attachment and update its name
            taskService.createAttachment("web page",
                                         taskId,
                                         null,
                                         "weatherforcast",
                                         "temperatures and more",
                                         "http://weather.com");
            Attachment attachment = taskService.getTaskAttachments(taskId).get(0);
            attachment.setName("UpdatedName");
            taskService.saveAttachment(attachment);

            // Refetch and verify
            attachment = taskService.getTaskAttachments(taskId).get(0);
            assertThat(attachment.getName()).isEqualTo("UpdatedName");

            // Finally, clean up
            taskService.deleteTask(taskId);

            assertThat(taskService.getTaskComments(taskId)).hasSize(0);
            assertThat(historyService.createHistoricTaskInstanceQuery().taskId(taskId).list()).hasSize(1);

            taskService.deleteTask(taskId,
                                   true);
        }
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testTaskAttachmentWithProcessInstanceId() {
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.ACTIVITY)) {

            ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskProcess");

            String processInstanceId = processInstance.getId();
            taskService.createAttachment("web page",
                                         null,
                                         processInstanceId,
                                         "weatherforcast",
                                         "temperatures and more",
                                         "http://weather.com");
            Attachment attachment = taskService.getProcessInstanceAttachments(processInstanceId).get(0);
            assertThat(attachment.getName()).isEqualTo("weatherforcast");
            assertThat(attachment.getDescription()).isEqualTo("temperatures and more");
            assertThat(attachment.getType()).isEqualTo("web page");
            assertThat(attachment.getProcessInstanceId()).isEqualTo(processInstanceId);
            assertThat(attachment.getTaskId()).isNull();
            assertThat(attachment.getUrl()).isEqualTo("http://weather.com");
            assertThat(taskService.getAttachmentContent(attachment.getId())).isNull();

            // Finally, clean up
            taskService.deleteAttachment(attachment.getId());

            // TODO: Bad API design. Need to fix attachment/comment properly
            ((TaskServiceImpl) taskService).deleteComments(null,
                                                           processInstanceId);
        }
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testMultipleProcessesStarted() {

        // Start a few process instances
        for (int i = 0; i < 20; i++) {
            processEngine.getRuntimeService().startProcessInstanceByKey("oneTaskProcess");
        }

        // See if there are tasks for kermit
        List<Task> tasks = processEngine.getTaskService().createTaskQuery().list();
        assertThat(tasks).hasSize(20);
    }

    public void testTaskDelegation() {
        Task task = taskService.newTask();
        task.setOwner("johndoe");
        taskService.saveTask(task);
        taskService.delegateTask(task.getId(), "joesmoe");
        String taskId = task.getId();

        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("johndoe");
        assertThat(task.getAssignee()).isEqualTo("joesmoe");
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.PENDING);

        // try to complete (should fail)
        Task exceptionTask = task;
        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.complete(exceptionTask.getId()));

        taskService.resolveTask(taskId);
        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("johndoe");
        assertThat(task.getAssignee()).isEqualTo("johndoe");
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.RESOLVED);

        task.setAssignee(null);
        task.setDelegationState(null);
        taskService.saveTask(task);
        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("johndoe");
        assertThat(task.getAssignee()).isNull();
        assertThat(task.getDelegationState()).isNull();

        task.setAssignee("jackblack");
        task.setDelegationState(DelegationState.RESOLVED);
        taskService.saveTask(task);
        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("johndoe");
        assertThat(task.getAssignee()).isEqualTo("jackblack");
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.RESOLVED);

        // Finally, delete task
        taskService.deleteTask(taskId,
                               true);
    }

    public void testTaskDelegationThroughServiceCall() {
        Task task = taskService.newTask();
        task.setOwner("johndoe");
        taskService.saveTask(task);
        String taskId = task.getId();

        // Fetch the task again and update
        task = taskService.createTaskQuery().taskId(taskId).singleResult();

        taskService.delegateTask(task.getId(),
                                 "joesmoe");

        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("johndoe");
        assertThat(task.getAssignee()).isEqualTo("joesmoe");
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.PENDING);

        taskService.resolveTask(taskId);

        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("johndoe");
        assertThat(task.getAssignee()).isEqualTo("johndoe");
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.RESOLVED);

        // Finally, delete task
        taskService.deleteTask(taskId,
                               true);
    }

    public void testTaskAssignee() {
        Task task = taskService.newTask();
        task.setAssignee("johndoe");
        taskService.saveTask(task);

        // Fetch the task again and update
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getAssignee()).isEqualTo("johndoe");

        task.setAssignee("joesmoe");
        taskService.saveTask(task);

        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getAssignee()).isEqualTo("joesmoe");

        // Finally, delete task
        taskService.deleteTask(task.getId(),
                               true);
    }

    public void testSaveTaskNullTask() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.saveTask(null))
            .withMessageContaining("task is null");
    }

    public void testDeleteTaskNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.deleteTask(null));
    }

    public void testDeleteTaskUnexistingTaskId() {
        // Deleting unexisting task should be silently ignored
        taskService.deleteTask("unexistingtaskid");
    }

    public void testDeleteTasksNullTaskIds() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.deleteTasks(null));
    }

    public void testDeleteTasksTaskIdsUnexistingTaskId() {

        Task existingTask = taskService.newTask();
        taskService.saveTask(existingTask);

        // The unexisting taskId's should be silently ignored. Existing task should have been deleted.
        taskService.deleteTasks(asList("unexistingtaskid1", existingTask.getId()), true);

        existingTask = taskService.createTaskQuery().taskId(existingTask.getId()).singleResult();
        assertThat(existingTask).isNull();
    }

    public void testDeleteTaskIdentityLink() {
        Task task = null;
        try {
            task = taskService.newTask();
            task.setName("test");
            taskService.saveTask(task);

            taskService.addCandidateGroup(task.getId(),
                                          "sales");
            taskService.addCandidateUser(task.getId(),
                                         "kermit");

            assertThat(taskService.createTaskQuery().taskCandidateGroup("sales").singleResult()).isNotNull();
            assertThat(taskService.createTaskQuery().taskCandidateUser("kermit").singleResult()).isNotNull();

            // Delete identity link for group
            taskService.deleteGroupIdentityLink(task.getId(),
                                                "sales",
                                                "candidate");

            // Link should be removed
            assertThat(taskService.createTaskQuery().taskCandidateGroup("sales").singleResult()).isNull();

            // User link should remain unaffected
            assertThat(taskService.createTaskQuery().taskCandidateUser("kermit").singleResult()).isNotNull();
        } finally {
            // Adhoc task not part of deployment, cleanup
            if (task != null && task.getId() != null) {
                taskService.deleteTask(task.getId());
                if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.AUDIT)) {
                    historyService.deleteHistoricTaskInstance(task.getId());
                }
            }
        }
    }

    public void testClaimNullArguments() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.claim(null, "userid"))
            .withMessageContaining("taskId is null");
    }

    public void testClaimUnexistingTaskId() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.claim("unexistingtaskid", "user"))
            .withMessageContaining("Cannot find task with id unexistingtaskid")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testClaimAlreadyClaimedTaskByOtherUser() {
        Task task = taskService.newTask();
        taskService.saveTask(task);

        // Claim task the first time
        taskService.claim(task.getId(), "firstuser");

        assertThatExceptionOfType(ActivitiTaskAlreadyClaimedException.class)
            .isThrownBy(() -> taskService.claim(task.getId(), "seconduser"))
            .withMessageContaining("Task '" + task.getId() + "' is already claimed by someone else.");

        taskService.deleteTask(task.getId(), true);
    }

    public void testClaimAlreadyClaimedTaskBySameUser() {
        Task task = taskService.newTask();
        taskService.saveTask(task);

        // Claim task the first time
        taskService.claim(task.getId(), "user");
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();

        // Claim the task again with the same user. No exception should be thrown
        taskService.claim(task.getId(), "user");

        taskService.deleteTask(task.getId(), true);
    }

    public void testUnClaimTask() {
        Task task = taskService.newTask();
        taskService.saveTask(task);

        // Claim task the first time
        taskService.claim(task.getId(), "user");
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getAssignee()).isEqualTo("user");

        // Unclaim the task
        taskService.unclaim(task.getId());

        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getAssignee()).isNull();

        taskService.deleteTask(task.getId(), true);
    }

    public void testCompleteTaskNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.complete(null))
            .withMessageContaining("taskId is null");
    }

    public void testCompleteTaskUnexistingTaskId() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.complete("unexistingtask"))
            .withMessageContaining("Cannot find task with id unexistingtask")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testCompleteTaskWithParametersNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.complete(null))
            .withMessageContaining("taskId is null");
    }

    public void testCompleteTaskWithParametersUnexistingTaskId() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.complete("unexistingtask"))
            .withMessageContaining("Cannot find task with id unexistingtask")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testCompleteTaskWithParametersNullParameters() {
        Task task = taskService.newTask();
        taskService.saveTask(task);

        String taskId = task.getId();
        taskService.complete(taskId, null);

        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.AUDIT)) {
            historyService.deleteHistoricTaskInstance(taskId);
        }

        // Fetch the task again
        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task).isNull();
    }

    @SuppressWarnings("unchecked")
    public void testCompleteTaskWithParametersEmptyParameters() {
        Task task = taskService.newTask();
        taskService.saveTask(task);

        String taskId = task.getId();
        taskService.complete(taskId,
                             Collections.EMPTY_MAP);

        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.AUDIT)) {
            historyService.deleteHistoricTaskInstance(taskId);
        }

        // Fetch the task again
        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task).isNull();
    }

    @Deployment(resources = {"org/activiti/engine/test/api/twoTasksProcess.bpmn20.xml"})
    public void testCompleteWithParametersTask() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("twoTasksProcess");

        // Fetch first task
        Task task = taskService.createTaskQuery().singleResult();
        assertThat(task.getName()).isEqualTo("First task");

        // Complete first task
        Map<String, Object> taskParams = new HashMap<String, Object>();
        taskParams.put("myParam",
                       "myValue");
        taskService.complete(task.getId(),
                             taskParams);

        // Fetch second task
        task = taskService.createTaskQuery().singleResult();
        assertThat(task.getName()).isEqualTo("Second task");

        // Verify task parameters set on execution
        Map<String, Object> variables = runtimeService.getVariables(processInstance.getId());
        assertThat(variables).hasSize(1);
        assertThat(variables.get("myParam")).isEqualTo("myValue");
    }

    @Deployment(resources = {"org/activiti/engine/test/api/twoTasksProcess.bpmn20.xml"})
    public void testCompleteWithParametersTask2() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("twoTasksProcess");

        // Fetch first task
        Task task = taskService.createTaskQuery().singleResult();
        assertThat(task.getName()).isEqualTo("First task");

        // Complete first task
        Map<String, Object> taskParams = new HashMap<String, Object>();
        taskParams.put("myParam", "myValue");
        taskService.complete(task.getId(), taskParams, false); // Only
        // difference with previous test

        // Fetch second task
        task = taskService.createTaskQuery().singleResult();
        assertThat(task.getName()).isEqualTo("Second task");

        // Verify task parameters set on execution
        Map<String, Object> variables = runtimeService.getVariables(processInstance.getId());
        assertThat(variables).hasSize(1);
        assertThat(variables.get("myParam")).isEqualTo("myValue");
    }

    @Deployment
    public void testCompleteWithTaskLocalParameters() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("testTaskLocalVars");

        // Fetch first task
        Task task = taskService.createTaskQuery().singleResult();

        // Complete first task
        Map<String, Object> taskParams = new HashMap<String, Object>();
        taskParams.put("a", 1);
        taskParams.put("b", 1);
        taskService.complete(task.getId(), taskParams, true);

        // Verify vars are not stored process instance wide
        assertThat(runtimeService.getVariable(processInstance.getId(), "a")).isNull();
        assertThat(runtimeService.getVariable(processInstance.getId(), "b")).isNull();

        // verify script listener has done its job
        assertThat(runtimeService.getVariable(processInstance.getId(), "sum")).isEqualTo(Integer.valueOf(2));

        // Fetch second task
        taskService.createTaskQuery().singleResult();
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskWithFormKeyProcess.bpmn20.xml"})
    public void testCompleteTaskWithFormKey() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskWithFormProcess");

        // Fetch task
        Task task = taskService.createTaskQuery().processInstanceId(processInstance.getId()).singleResult();
        assertThat(task.getName()).isEqualTo("my task");
        assertThat(task.getFormKey()).isEqualTo("myFormKey");
        assertThat(task.getAssignee()).isEqualTo("myAssignee");
        assertThat(task.getOwner()).isEqualTo("myOwner");
        assertThat(task.getCategory()).isEqualTo("myCategory");
        assertThat(task.getPriority()).isEqualTo(60);
        assertThat(task.getDueDate()).isNotNull();

        // Complete task
        taskService.complete(task.getId());

        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.ACTIVITY)) {
            HistoricTaskInstance historicTask = historyService.createHistoricTaskInstanceQuery().taskId(task.getId()).singleResult();
            assertThat(historicTask.getName()).isEqualTo("my task");
            assertThat(historicTask.getFormKey()).isEqualTo("myFormKey");
            assertThat(historicTask.getAssignee()).isEqualTo("myAssignee");
            assertThat(historicTask.getOwner()).isEqualTo("myOwner");
            assertThat(historicTask.getCategory()).isEqualTo("myCategory");
            assertThat(historicTask.getPriority()).isEqualTo(60);
            assertThat(historicTask.getDueDate()).isNotNull();
        }
    }

    public void testSetAssignee() {

        Task task = taskService.newTask();
        assertThat(task.getAssignee()).isNull();
        taskService.saveTask(task);

        // Set assignee
        taskService.setAssignee(task.getId(), "user");

        // Fetch task again
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getAssignee()).isEqualTo("user");

        // Set assignee to null
        taskService.setAssignee(task.getId(), null);

        taskService.deleteTask(task.getId(), true);
    }

    public void testSetAssigneeNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.setAssignee(null, "userId"))
            .withMessageContaining("taskId is null");
    }

    public void testSetAssigneeUnexistingTask() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.setAssignee("unexistingTaskId", "user"))
            .withMessageContaining("Cannot find task with id unexistingTaskId")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testAddCandidateUserDuplicate() {
        // Check behavior when adding the same user twice as candidate

        Task task = taskService.newTask();
        taskService.saveTask(task);

        taskService.addCandidateUser(task.getId(), "user");

        // Add as candidate the second time
        taskService.addCandidateUser(task.getId(), "user");

        taskService.deleteTask(task.getId(), true);
    }

    public void testAddCandidateUserNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addCandidateUser(null, "userId"))
            .withMessageContaining("taskId is null");
    }

    public void testAddCandidateUserNullUserId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addCandidateUser("taskId", null))
            .withMessageContaining("identityId is null");
    }

    public void testAddCandidateUserUnexistingTask() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.addCandidateUser("unexistingTaskId", "user"))
            .withMessageContaining("Cannot find task with id unexistingTaskId")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testAddCandidateGroupNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addCandidateGroup(null, "groupId"))
            .withMessageContaining("taskId is null");
    }

    public void testAddCandidateGroupNullGroupId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addCandidateGroup("taskId", null))
            .withMessageContaining("identityId is null");
    }

    public void testAddCandidateGroupUnexistingTask() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.addCandidateGroup("unexistingTaskId", "group"))
            .withMessageContaining("Cannot find task with id unexistingTaskId")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testAddGroupIdentityLinkNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addGroupIdentityLink(null, "groupId", IdentityLinkType.CANDIDATE))
            .withMessageContaining("taskId is null");
    }

    public void testAddGroupIdentityLinkNullUserId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addGroupIdentityLink("taskId", null, IdentityLinkType.CANDIDATE))
            .withMessageContaining("identityId is null");
    }

    public void testAddGroupIdentityLinkUnexistingTask() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.addGroupIdentityLink("unexistingTaskId", "user", IdentityLinkType.CANDIDATE))
            .withMessageContaining("Cannot find task with id unexistingTaskId")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testAddUserIdentityLinkNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addUserIdentityLink(null, "userId", IdentityLinkType.CANDIDATE))
            .withMessageContaining("taskId is null");
    }

    public void testAddUserIdentityLinkNullUserId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.addUserIdentityLink("taskId", null, IdentityLinkType.CANDIDATE))
            .withMessageContaining("identityId is null");
    }

    public void testAddUserIdentityLinkUnexistingTask() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.addUserIdentityLink("unexistingTaskId", "user", IdentityLinkType.CANDIDATE))
            .withMessageContaining("Cannot find task with id unexistingTaskId")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testGetIdentityLinksWithCandidateUser() {
        Task task = taskService.newTask();
        taskService.saveTask(task);
        String taskId = task.getId();

        taskService.addCandidateUser(taskId, "kermit");
        List<IdentityLink> identityLinks = taskService.getIdentityLinksForTask(taskId);
        assertThat(identityLinks).hasSize(1);
        assertThat(identityLinks.get(0).getUserId()).isEqualTo("kermit");
        assertThat(identityLinks.get(0).getGroupId()).isNull();
        assertThat(identityLinks.get(0).getType()).isEqualTo(IdentityLinkType.CANDIDATE);

        // cleanup
        taskService.deleteTask(taskId, true);
    }

    public void testGetIdentityLinksWithCandidateGroup() {
        Task task = taskService.newTask();
        taskService.saveTask(task);
        String taskId = task.getId();

        taskService.addCandidateGroup(taskId,
                                      "muppets");
        List<IdentityLink> identityLinks = taskService.getIdentityLinksForTask(taskId);
        assertThat(identityLinks).hasSize(1);
        assertThat(identityLinks.get(0).getGroupId()).isEqualTo("muppets");
        assertThat(identityLinks.get(0).getUserId()).isNull();
        assertThat(identityLinks.get(0).getType()).isEqualTo(IdentityLinkType.CANDIDATE);

        // cleanup
        taskService.deleteTask(taskId,
                               true);
    }

    public void testGetIdentityLinksWithAssignee() {
        Task task = taskService.newTask();
        taskService.saveTask(task);
        String taskId = task.getId();

        taskService.claim(taskId,
                          "kermit");
        List<IdentityLink> identityLinks = taskService.getIdentityLinksForTask(taskId);
        assertThat(identityLinks).hasSize(1);
        assertThat(identityLinks.get(0).getUserId()).isEqualTo("kermit");
        assertThat(identityLinks.get(0).getGroupId()).isNull();
        assertThat(identityLinks.get(0).getType()).isEqualTo(IdentityLinkType.ASSIGNEE);

        // cleanup
        taskService.deleteTask(taskId,
                               true);
    }

    public void testGetIdentityLinksWithNonExistingAssignee() {
        Task task = taskService.newTask();
        taskService.saveTask(task);
        String taskId = task.getId();

        taskService.claim(taskId,
                          "nonExistingAssignee");
        List<IdentityLink> identityLinks = taskService.getIdentityLinksForTask(taskId);
        assertThat(identityLinks).hasSize(1);
        assertThat(identityLinks.get(0).getUserId()).isEqualTo("nonExistingAssignee");
        assertThat(identityLinks.get(0).getGroupId()).isNull();
        assertThat(identityLinks.get(0).getType()).isEqualTo(IdentityLinkType.ASSIGNEE);

        // cleanup
        taskService.deleteTask(taskId,
                               true);
    }

    public void testGetIdentityLinksWithOwner() {
        Task task = taskService.newTask();
        taskService.saveTask(task);
        String taskId = task.getId();

        taskService.claim(taskId,
                          "kermit");
        taskService.delegateTask(taskId,
                                 "fozzie");

        List<IdentityLink> identityLinks = taskService.getIdentityLinksForTask(taskId);
        assertThat(identityLinks).hasSize(2);

        IdentityLink assignee = identityLinks.get(0);
        assertThat(assignee.getUserId()).isEqualTo("fozzie");
        assertThat(assignee.getGroupId()).isNull();
        assertThat(assignee.getType()).isEqualTo(IdentityLinkType.ASSIGNEE);

        IdentityLink owner = identityLinks.get(1);
        assertThat(owner.getUserId()).isEqualTo("kermit");
        assertThat(owner.getGroupId()).isNull();
        assertThat(owner.getType()).isEqualTo(IdentityLinkType.OWNER);

        // cleanup
        taskService.deleteTask(taskId,
                               true);
    }

    public void testGetIdentityLinksWithNonExistingOwner() {
        Task task = taskService.newTask();
        taskService.saveTask(task);
        String taskId = task.getId();

        taskService.claim(taskId,
                          "nonExistingOwner");
        taskService.delegateTask(taskId,
                                 "nonExistingAssignee");
        List<IdentityLink> identityLinks = taskService.getIdentityLinksForTask(taskId);
        assertThat(identityLinks).hasSize(2);

        IdentityLink assignee = identityLinks.get(0);
        assertThat(assignee.getUserId()).isEqualTo("nonExistingAssignee");
        assertThat(assignee.getGroupId()).isNull();
        assertThat(assignee.getType()).isEqualTo(IdentityLinkType.ASSIGNEE);

        IdentityLink owner = identityLinks.get(1);
        assertThat(owner.getUserId()).isEqualTo("nonExistingOwner");
        assertThat(owner.getGroupId()).isNull();
        assertThat(owner.getType()).isEqualTo(IdentityLinkType.OWNER);

        // cleanup
        taskService.deleteTask(taskId,
                               true);
    }

    public void testSetPriority() {
        Task task = taskService.newTask();
        taskService.saveTask(task);

        taskService.setPriority(task.getId(),
                                12345);

        // Fetch task again to check if the priority is set
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getPriority()).isEqualTo(12345);

        taskService.deleteTask(task.getId(),
                               true);
    }

    public void testSetPriorityUnexistingTaskId() {
        assertThatExceptionOfType(ActivitiObjectNotFoundException.class)
            .isThrownBy(() -> taskService.setPriority("unexistingtask", 12345))
            .withMessageContaining("Cannot find task with id unexistingtask")
            .satisfies(ae -> assertThat(ae.getObjectClass()).isEqualTo(Task.class));
    }

    public void testSetPriorityNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.setPriority(null, 12345))
            .withMessageContaining("taskId is null");
    }

    public void testSetDueDate() {
        Task task = taskService.newTask();
        taskService.saveTask(task);

        // Set the due date to a non-null value
        Date now = new Date();
        taskService.setDueDate(task.getId(),
                               now);

        // Fetch task to check if the due date was persisted
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getDueDate()).isNotNull();

        // Set the due date to null
        taskService.setDueDate(task.getId(),
                               null);

        // Re-fetch the task to make sure the due date was set to null
        task = taskService.createTaskQuery().taskId(task.getId()).singleResult();
        assertThat(task.getDueDate()).isNull();

        taskService.deleteTask(task.getId(),
                               true);
    }

    public void testSetDueDateUnexistingTaskId() {
        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.setDueDate("unexistingtask", new Date()))
            .withMessageContaining("Cannot find task with id unexistingtask");
    }

    public void testSetDueDateNullTaskId() {
        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.setDueDate(null, new Date()))
            .withMessageContaining("taskId is null");
    }

    /**
     * @see <a href="https://activiti.atlassian.net/browse/ACT-1059">https://activiti.atlassian.net/browse/ACT-1059</a>
     */
    public void testSetDelegationState() {
        Task task = taskService.newTask();
        task.setOwner("wuzh");
        taskService.saveTask(task);
        taskService.delegateTask(task.getId(),
                                 "other");
        String taskId = task.getId();

        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("wuzh");
        assertThat(task.getAssignee()).isEqualTo("other");
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.PENDING);

        task.setDelegationState(DelegationState.RESOLVED);
        taskService.saveTask(task);

        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getOwner()).isEqualTo("wuzh");
        assertThat(task.getAssignee()).isEqualTo("other");
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.RESOLVED);

        taskService.deleteTask(taskId,
                               true);
    }

    private void checkHistoricVariableUpdateEntity(String variableName,
                                                   String processInstanceId) {
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.FULL)) {
            boolean deletedVariableUpdateFound = false;

            List<HistoricDetail> resultSet = historyService.createHistoricDetailQuery().processInstanceId(processInstanceId).list();
            for (HistoricDetail currentHistoricDetail : resultSet) {
                assertThat(currentHistoricDetail).isInstanceOf(HistoricDetailVariableInstanceUpdateEntity.class);
                HistoricDetailVariableInstanceUpdateEntity historicVariableUpdate = (HistoricDetailVariableInstanceUpdateEntity) currentHistoricDetail;

                if (historicVariableUpdate.getName().equals(variableName)) {
                    if (historicVariableUpdate.getValue() == null) {
                        if (deletedVariableUpdateFound) {
                            fail("Mismatch: A HistoricVariableUpdateEntity with a null value already found");
                        } else {
                            deletedVariableUpdateFound = true;
                        }
                    }
                }
            }

            assertThat(deletedVariableUpdateFound).isTrue();
        }
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testRemoveVariable() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskProcess");

        Task currentTask = taskService.createTaskQuery().singleResult();

        taskService.setVariable(currentTask.getId(), "variable1", "value1");
        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isEqualTo("value1");
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable1")).isNull();

        taskService.removeVariable(currentTask.getId(), "variable1");

        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isNull();

        checkHistoricVariableUpdateEntity("variable1", processInstance.getId());
    }

    public void testRemoveVariableNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.removeVariable(null, "variable"))
            .withMessageContaining("taskId is null");
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testGetVariableByHistoricActivityInstance() {
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.FULL)) {
            ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskProcess");
            assertThat(processInstance).isNotNull();
            Task task = taskService.createTaskQuery().singleResult();

            taskService.setVariable(task.getId(),
                                    "variable1",
                                    "value1");
            taskService.setVariable(task.getId(),
                                    "variable1",
                                    "value2");

            HistoricActivityInstance historicActivitiInstance = historyService.createHistoricActivityInstanceQuery().processInstanceId(processInstance.getId())
                    .activityId("theTask").singleResult();
            assertThat(historicActivitiInstance).isNotNull();

            List<HistoricDetail> resultSet = historyService.createHistoricDetailQuery().variableUpdates().activityInstanceId(historicActivitiInstance.getId())
                    .list();

            assertThat(resultSet).hasSize(2);
            assertThat(resultSet)
                    .extracting(h -> ((HistoricVariableUpdate) h).getValue())
                    .containsExactlyInAnyOrder("value1", "value2");
            assertThat(resultSet)
                    .extracting(h -> ((HistoricVariableUpdate) h).getVariableName())
                    .containsOnly("variable1");
        }
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testRemoveVariables() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskProcess");

        Task currentTask = taskService.createTaskQuery().singleResult();

        Map<String, Object> varsToDelete = new HashMap<String, Object>();
        varsToDelete.put("variable1", "value1");
        varsToDelete.put("variable2", "value2");
        taskService.setVariables(currentTask.getId(), varsToDelete);
        taskService.setVariable(currentTask.getId(), "variable3", "value3");

        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isEqualTo("value1");
        assertThat(taskService.getVariable(currentTask.getId(), "variable2")).isEqualTo("value2");
        assertThat(taskService.getVariable(currentTask.getId(), "variable3")).isEqualTo("value3");
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable1")).isNull();
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable2")).isNull();
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable3")).isNull();

        taskService.removeVariables(currentTask.getId(), varsToDelete.keySet());

        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isNull();
        assertThat(taskService.getVariable(currentTask.getId(), "variable2")).isNull();
        assertThat(taskService.getVariable(currentTask.getId(), "variable3")).isEqualTo("value3");

        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable1")).isNull();
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable2")).isNull();
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable3")).isNull();

        checkHistoricVariableUpdateEntity("variable1", processInstance.getId());
        checkHistoricVariableUpdateEntity("variable2", processInstance.getId());
    }

    public void testRemoveVariablesNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.removeVariables(null, emptyList()))
            .withMessageContaining("taskId is null");
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testRemoveVariableLocal() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskProcess");

        Task currentTask = taskService.createTaskQuery().singleResult();

        taskService.setVariableLocal(currentTask.getId(), "variable1", "value1");
        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isEqualTo("value1");
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable1")).isEqualTo("value1");

        taskService.removeVariableLocal(currentTask.getId(), "variable1");

        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isNull();
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable1")).isNull();

        checkHistoricVariableUpdateEntity("variable1", processInstance.getId());
    }

    public void testRemoveVariableLocalNullTaskId() {
        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.removeVariableLocal(null, "variable"))
            .withMessageContaining("taskId is null");
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testRemoveVariablesLocal() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("oneTaskProcess");

        Task currentTask = taskService.createTaskQuery().singleResult();

        Map<String, Object> varsToDelete = new HashMap<String, Object>();
        varsToDelete.put("variable1", "value1");
        varsToDelete.put("variable2", "value2");
        taskService.setVariablesLocal(currentTask.getId(), varsToDelete);
        taskService.setVariableLocal(currentTask.getId(), "variable3", "value3");

        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isEqualTo("value1");
        assertThat(taskService.getVariable(currentTask.getId(), "variable2")).isEqualTo("value2");
        assertThat(taskService.getVariable(currentTask.getId(), "variable3")).isEqualTo("value3");
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable1")).isEqualTo("value1");
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable2")).isEqualTo("value2");
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable3")).isEqualTo("value3");

        taskService.removeVariables(currentTask.getId(), varsToDelete.keySet());

        assertThat(taskService.getVariable(currentTask.getId(), "variable1")).isNull();
        assertThat(taskService.getVariable(currentTask.getId(), "variable2")).isNull();
        assertThat(taskService.getVariable(currentTask.getId(), "variable3")).isEqualTo("value3");

        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable1")).isNull();
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable2")).isNull();
        assertThat(taskService.getVariableLocal(currentTask.getId(), "variable3")).isEqualTo("value3");

        checkHistoricVariableUpdateEntity("variable1", processInstance.getId());
        checkHistoricVariableUpdateEntity("variable2", processInstance.getId());
    }

    public void testRemoveVariablesLocalNullTaskId() {
        assertThatExceptionOfType(ActivitiIllegalArgumentException.class)
            .isThrownBy(() -> taskService.removeVariablesLocal(null, emptyList()))
            .withMessageContaining("taskId is null");
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testUserTaskOptimisticLocking() {
        runtimeService.startProcessInstanceByKey("oneTaskProcess");

        Task task1 = taskService.createTaskQuery().singleResult();
        Task task2 = taskService.createTaskQuery().singleResult();

        task1.setDescription("test description one");
        taskService.saveTask(task1);

        assertThatExceptionOfType(ActivitiOptimisticLockingException.class)
            .isThrownBy(() -> {
                task2.setDescription("test description two");
                taskService.saveTask(task2);
            });
    }

    public void testDeleteTaskWithDeleteReason() {
        // ACT-900: deleteReason can be manually specified - can only be
        // validated when historyLevel > ACTIVITY
        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.ACTIVITY)) {

            Task task = taskService.newTask();
            task.setName("test task");
            taskService.saveTask(task);

            assertThat(task.getId()).isNotNull();

            taskService.deleteTask(task.getId(),
                                   "deleted for testing purposes");

            HistoricTaskInstance historicTaskInstance = historyService.createHistoricTaskInstanceQuery().taskId(task.getId()).singleResult();

            assertThat(historicTaskInstance).isNotNull();
            assertThat(historicTaskInstance.getDeleteReason()).isEqualTo("deleted for testing purposes");

            // Delete historic task that is left behind, will not be cleaned up
            // because this is not part of a process
            taskService.deleteTask(task.getId(),
                                   true);
        }
    }

    public void testResolveTaskNullTaskId() {
        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.resolveTask(null))
            .withMessageContaining("taskId is null");
    }

    public void testResolveTaskUnexistingTaskId() {
        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.resolveTask("blergh"))
            .withMessageContaining("Cannot find task with id");
    }

    public void testResolveTaskWithParametersNullParameters() {
        Task task = taskService.newTask();
        task.setDelegationState(DelegationState.PENDING);
        taskService.saveTask(task);

        String taskId = task.getId();
        taskService.resolveTask(taskId,
                                null);

        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.AUDIT)) {
            historyService.deleteHistoricTaskInstance(taskId);
        }

        // Fetch the task again
        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.RESOLVED);

        taskService.deleteTask(taskId,
                               true);
    }

    public void testResolveTaskWithParametersEmptyParameters() {
        Task task = taskService.newTask();
        task.setDelegationState(DelegationState.PENDING);
        taskService.saveTask(task);

        String taskId = task.getId();
        taskService.resolveTask(taskId, emptyMap());

        if (processEngineConfiguration.getHistoryLevel().isAtLeast(HistoryLevel.AUDIT)) {
            historyService.deleteHistoricTaskInstance(taskId);
        }

        // Fetch the task again
        task = taskService.createTaskQuery().taskId(taskId).singleResult();
        assertThat(task.getDelegationState()).isEqualTo(DelegationState.RESOLVED);

        taskService.deleteTask(taskId, true);
    }

    @Deployment(resources = {"org/activiti/engine/test/api/twoTasksProcess.bpmn20.xml"})
    public void testResolveWithParametersTask() {
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("twoTasksProcess");

        // Fetch first task
        Task task = taskService.createTaskQuery().singleResult();
        assertThat(task.getName()).isEqualTo("First task");

        taskService.delegateTask(task.getId(), "johndoe");

        // Resolve first task
        Map<String, Object> taskParams = new HashMap<String, Object>();
        taskParams.put("myParam", "myValue");
        taskService.resolveTask(task.getId(), taskParams);

        // Verify that task is resolved
        task = taskService.createTaskQuery().taskDelegationState(DelegationState.RESOLVED).singleResult();
        assertThat(task.getName()).isEqualTo("First task");

        // Verify task parameters set on execution
        Map<String, Object> variables = runtimeService.getVariables(processInstance.getId());
        assertThat(variables).hasSize(1);
        assertThat(variables.get("myParam")).isEqualTo("myValue");
    }

    @Deployment(resources = {"org/activiti/engine/test/api/oneTaskProcess.bpmn20.xml"})
    public void testDeleteTaskPartOfProcess() {
        runtimeService.startProcessInstanceByKey("oneTaskProcess");
        Task task = taskService.createTaskQuery().singleResult();
        assertThat(task).isNotNull();

        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.deleteTask(task.getId()))
            .withMessage("The task cannot be deleted because is part of a running process");

        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.deleteTask(task.getId(), true))
            .withMessage("The task cannot be deleted because is part of a running process");

        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.deleteTask(task.getId(), "test"))
            .withMessage("The task cannot be deleted because is part of a running process");

        assertThatExceptionOfType(ActivitiException.class)
            .isThrownBy(() -> taskService.deleteTasks(singletonList(task.getId())))
            .withMessage("The task cannot be deleted because is part of a running process");

        assertThatExceptionOfType(ActivitiException.class)

Answer: .isThrownBy(() -> taskService.deleteTasks(singletonList(task.getId()), true))

<think>
The test method is checking that deleting a task that is part of a running process throws an ActivitiException. After the previous assertThatExceptionOfType block, the next assertion starts with the same pattern but tests the overload deleteTasks(List<String>, boolean). Therefore the next line continues the chain with the isThrownBy lambda calling deleteTasks with the task id and cascade=true.
</think>
.isThrownBy(() -> taskService.deleteTasks(singletonList(task.getId()), true))


Context:
# -*- coding: utf-8 -*-
# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from collections import OrderedDict
import os
import re
from typing import Dict, Optional, Sequence, Tuple, Type, Union
import pkg_resources

from google.api_core import client_options as client_options_lib
from google.api_core import exceptions as core_exceptions
from google.api_core import gapic_v1
from google.api_core import retry as retries
from google.auth import credentials as ga_credentials  # type: ignore
from google.auth.transport import mtls  # type: ignore
from google.auth.transport.grpc import SslCredentials  # type: ignore
from google.auth.exceptions import MutualTLSChannelError  # type: ignore
from google.oauth2 import service_account  # type: ignore

try:
    OptionalRetry = Union[retries.Retry, gapic_v1.method._MethodDefault]
except AttributeError:  # pragma: NO COVER
    OptionalRetry = Union[retries.Retry, object]  # type: ignore

from google.api_core import operation as gac_operation  # type: ignore
from google.api_core import operation_async  # type: ignore
from google.cloud.aiplatform_v1.services.specialist_pool_service import pagers
from google.cloud.aiplatform_v1.types import operation as gca_operation
from google.cloud.aiplatform_v1.types import specialist_pool
from google.cloud.aiplatform_v1.types import specialist_pool as gca_specialist_pool
from google.cloud.aiplatform_v1.types import specialist_pool_service
from google.protobuf import empty_pb2  # type: ignore
from google.protobuf import field_mask_pb2  # type: ignore
from .transports.base import SpecialistPoolServiceTransport, DEFAULT_CLIENT_INFO
from .transports.grpc import SpecialistPoolServiceGrpcTransport
from .transports.grpc_asyncio import SpecialistPoolServiceGrpcAsyncIOTransport

class SpecialistPoolServiceClientMeta(type):
    """Metaclass for the SpecialistPoolService client.

    This provides class-level methods for building and retrieving
    support objects (e.g. transport) without polluting the client instance
    objects.
    """

    _transport_registry = (
        OrderedDict()
    )  # type: Dict[str, Type[SpecialistPoolServiceTransport]]
    _transport_registry["grpc"] = SpecialistPoolServiceGrpcTransport
    _transport_registry["grpc_asyncio"] = SpecialistPoolServiceGrpcAsyncIOTransport

    def get_transport_class(
        cls, label: str = None,
    ) -> Type[SpecialistPoolServiceTransport]:
        """Returns an appropriate transport class.

        Args:
            label: The name of the desired transport. If none is
                provided, then the first transport in the registry is used.

        Returns:
            The transport class to use.
        """
        # If a specific transport is requested, return that one.
        if label:
            return cls._transport_registry[label]

        # No transport is requested; return the default (that is, the first one
        # in the dictionary).
        return next(iter(cls._transport_registry.values()))

class SpecialistPoolServiceClient(metaclass=SpecialistPoolServiceClientMeta):
    """A service for creating and managing Customer SpecialistPools.
    When customers start Data Labeling jobs, they can reuse/create
    Specialist Pools to bring their own Specialists to label the
    data. Customers can add/remove Managers for the Specialist Pool
    on Cloud console, then Managers will get email notifications to
    manage Specialists and tasks on CrowdCompute console.
    """

    @staticmethod
    def _get_default_mtls_endpoint(api_endpoint):
        """Converts api endpoint to mTLS endpoint.

        Convert "*.sandbox.googleapis.com" and "*.googleapis.com" to
        "*.mtls.sandbox.googleapis.com" and "*.mtls.googleapis.com" respectively.
        Args:
            api_endpoint (Optional[str]): the api endpoint to convert.
        Returns:
            str: converted mTLS api endpoint.
        """
        if not api_endpoint:
            return api_endpoint

        mtls_endpoint_re = re.compile(
            r"(?P<name>[^.]+)(?P<mtls>\.mtls)?(?P<sandbox>\.sandbox)?(?P<googledomain>\.googleapis\.com)?"
        )

        m = mtls_endpoint_re.match(api_endpoint)
        name, mtls, sandbox, googledomain = m.groups()
        if mtls or not googledomain:
            return api_endpoint

        if sandbox:
            return api_endpoint.replace(
                "sandbox.googleapis.com", "mtls.sandbox.googleapis.com"
            )

        return api_endpoint.replace(".googleapis.com", ".mtls.googleapis.com")

    DEFAULT_ENDPOINT = "aiplatform.googleapis.com"
    DEFAULT_MTLS_ENDPOINT = _get_default_mtls_endpoint.__func__(  # type: ignore
        DEFAULT_ENDPOINT
    )

    @classmethod
    def from_service_account_info(cls, info: dict, *args, **kwargs):
        """Creates an instance of this client using the provided credentials
            info.

        Args:
            info (dict): The service account private key info.
            args: Additional arguments to pass to the constructor.
            kwargs: Additional arguments to pass to the constructor.

        Returns:
            SpecialistPoolServiceClient: The constructed client.
        """
        credentials = service_account.Credentials.from_service_account_info(info)
        kwargs["credentials"] = credentials
        return cls(*args, **kwargs)

    @classmethod
    def from_service_account_file(cls, filename: str, *args, **kwargs):
        """Creates an instance of this client using the provided credentials
            file.

        Args:
            filename (str): The path to the service account private key json
                file.
            args: Additional arguments to pass to the constructor.
            kwargs: Additional arguments to pass to the constructor.

        Returns:
            SpecialistPoolServiceClient: The constructed client.
        """
        credentials = service_account.Credentials.from_service_account_file(filename)
        kwargs["credentials"] = credentials
        return cls(*args, **kwargs)

    from_service_account_json = from_service_account_file

    @property
    def transport(self) -> SpecialistPoolServiceTransport:
        """Returns the transport used by the client instance.

        Returns:
            SpecialistPoolServiceTransport: The transport used by the client
                instance.
        """
        return self._transport

    @staticmethod
    def specialist_pool_path(project: str, location: str, specialist_pool: str,) -> str:
        """Returns a fully-qualified specialist_pool string."""
        return "projects/{project}/locations/{location}/specialistPools/{specialist_pool}".format(
            project=project, location=location, specialist_pool=specialist_pool,
        )

    @staticmethod
    def parse_specialist_pool_path(path: str) -> Dict[str, str]:
        """Parses a specialist_pool path into its component segments."""
        m = re.match(
            r"^projects/(?P<project>.+?)/locations/(?P<location>.+?)/specialistPools/(?P<specialist_pool>.+?)$",
            path,
        )
        return m.groupdict() if m else {}

    @staticmethod
    def common_billing_account_path(billing_account: str,) -> str:
        """Returns a fully-qualified billing_account string."""
        return "billingAccounts/{billing_account}".format(
            billing_account=billing_account,
        )

    @staticmethod
    def parse_common_billing_account_path(path: str) -> Dict[str, str]:
        """Parse a billing_account path into its component segments."""
        m = re.match(r"^billingAccounts/(?P<billing_account>.+?)$", path)
        return m.groupdict() if m else {}

    @staticmethod
    def common_folder_path(folder: str,) -> str:
        """Returns a fully-qualified folder string."""
        return "folders/{folder}".format(folder=folder,)

    @staticmethod
    def parse_common_folder_path(path: str) -> Dict[str, str]:
        """Parse a folder path into its component segments."""
        m = re.match(r"^folders/(?P<folder>.+?)$", path)
        return m.groupdict() if m else {}

    @staticmethod
    def common_organization_path(organization: str,) -> str:
        """Returns a fully-qualified organization string."""
        return "organizations/{organization}".format(organization=organization,)

    @staticmethod
    def parse_common_organization_path(path: str) -> Dict[str, str]:
        """Parse a organization path into its component segments."""
        m = re.match(r"^organizations/(?P<organization>.+?)$", path)
        return m.groupdict() if m else {}

    @staticmethod
    def common_project_path(project: str,) -> str:
        """Returns a fully-qualified project string."""
        return "projects/{project}".format(project=project,)

    @staticmethod
    def parse_common_project_path(path: str) -> Dict[str, str]:
        """Parse a project path into its component segments."""
        m = re.match(r"^projects/(?P<project>.+?)$", path)
        return m.groupdict() if m else {}

    @staticmethod
    def common_location_path(project: str, location: str,) -> str:
        """Returns a fully-qualified location string."""
        return "projects/{project}/locations/{location}".format(
            project=project, location=location,
        )

    @staticmethod
    def parse_common_location_path(path: str) -> Dict[str, str]:
        """Parse a location path into its component segments."""
        m = re.match(r"^projects/(?P<project>.+?)/locations/(?P<location>.+?)$", path)
        return m.groupdict() if m else {}

    @classmethod
    def get_mtls_endpoint_and_cert_source(
        cls, client_options: Optional[client_options_lib.ClientOptions] = None
    ):
        """Return the API endpoint and client cert source for mutual TLS.

        The client cert source is determined in the following order:
        (1) if `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable is not "true", the
        client cert source is None.
        (2) if `client_options.client_cert_source` is provided, use the provided one; if the
        default client cert source exists, use the default one; otherwise the client cert
        source is None.

        The API endpoint is determined in the following order:
        (1) if `client_options.api_endpoint` if provided, use the provided one.
        (2) if `GOOGLE_API_USE_CLIENT_CERTIFICATE` environment variable is "always", use the
        default mTLS endpoint; if the environment variabel is "never", use the default API
        endpoint; otherwise if client cert source exists, use the default mTLS endpoint, otherwise
        use the default API endpoint.

        More details can be found at https://google.aip.dev/auth/4114.

        Args:
            client_options (google.api_core.client_options.ClientOptions): Custom options for the
                client. Only the `api_endpoint` and `client_cert_source` properties may be used
                in this method.

        Returns:
            Tuple[str, Callable[[], Tuple[bytes, bytes]]]: returns the API endpoint and the
                client cert source to use.

        Raises:
            google.auth.exceptions.MutualTLSChannelError: If any errors happen.
        """
        if client_options is None:
            client_options = client_options_lib.ClientOptions()
        use_client_cert = os.getenv("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false")
        use_mtls_endpoint = os.getenv("GOOGLE_API_USE_MTLS_ENDPOINT", "auto")
        if use_client_cert not in ("true", "false"):
            raise ValueError(
                "Environment variable `GOOGLE_API_USE_CLIENT_CERTIFICATE` must be either `true` or `false`"
            )
        if use_mtls_endpoint not in ("auto", "never", "always"):
            raise MutualTLSChannelError(
                "Environment variable `GOOGLE_API_USE_MTLS_ENDPOINT` must be `never`, `auto` or `always`"
            )

        # Figure out the client cert source to use.
        client_cert_source = None
        if use_client_cert == "true":
            if client_options.client_cert_source:
                client_cert_source = client_options.client_cert_source
            elif mtls.has_default_client_cert_source():
                client_cert_source = mtls.default_client_cert_source()

        # Figure out which api endpoint to use.
        if client_options.api_endpoint is not None:
            api_endpoint = client_options.api_endpoint
        elif use_mtls_endpoint == "always" or (
            use_mtls_endpoint == "auto" and client_cert_source
        ):
            api_endpoint = cls.DEFAULT_MTLS_ENDPOINT
        else:
            api_endpoint = cls.DEFAULT_ENDPOINT

        return api_endpoint, client_cert_source

    def __init__(
        self,
        *,
        credentials: Optional[ga_credentials.Credentials] = None,
        transport: Union[str, SpecialistPoolServiceTransport, None] = None,
        client_options: Optional[client_options_lib.ClientOptions] = None,
        client_info: gapic_v1.client_info.ClientInfo = DEFAULT_CLIENT_INFO,
    ) -> None:
        """Instantiates the specialist pool service client.

        Args:
            credentials (Optional[google.auth.credentials.Credentials]): The
                authorization credentials to attach to requests. These
                credentials identify the application to the service; if none
                are specified, the client will attempt to ascertain the
                credentials from the environment.
            transport (Union[str, SpecialistPoolServiceTransport]): The
                transport to use. If set to None, a transport is chosen
                automatically.
            client_options (google.api_core.client_options.ClientOptions): Custom options for the
                client. It won't take effect if a ``transport`` instance is provided.
                (1) The ``api_endpoint`` property can be used to override the
                default endpoint provided by the client. GOOGLE_API_USE_MTLS_ENDPOINT
                environment variable can also be used to override the endpoint:
                "always" (always use the default mTLS endpoint), "never" (always
                use the default regular endpoint) and "auto" (auto switch to the
                default mTLS endpoint if client certificate is present, this is
                the default value). However, the ``api_endpoint`` property takes
                precedence if provided.
                (2) If GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable
                is "true", then the ``client_cert_source`` property can be used
                to provide client certificate for mutual TLS transport. If
                not provided, the default SSL client certificate will be used if
                present. If GOOGLE_API_USE_CLIENT_CERTIFICATE is "false" or not
                set, no client certificate will be used.
            client_info (google.api_core.gapic_v1.client_info.ClientInfo):
                The client info used to send a user-agent string along with
                API requests. If ``None``, then default info will be used.
                Generally, you only need to set this if you're developing
                your own client library.

        Raises:
            google.auth.exceptions.MutualTLSChannelError: If mutual TLS transport
                creation failed for any reason.
        """
        if isinstance(client_options, dict):
            client_options = client_options_lib.from_dict(client_options)
        if client_options is None:
            client_options = client_options_lib.ClientOptions()

        api_endpoint, client_cert_source_func = self.get_mtls_endpoint_and_cert_source(
            client_options
        )

        api_key_value = getattr(client_options, "api_key", None)
        if api_key_value and credentials:
            raise ValueError(
                "client_options.api_key and credentials are mutually exclusive"
            )

        # Save or instantiate the transport.
        # Ordinarily, we provide the transport, but allowing a custom transport
        # instance provides an extensibility point for unusual situations.
        if isinstance(transport, SpecialistPoolServiceTransport):
            # transport is a SpecialistPoolServiceTransport instance.
            if credentials or client_options.credentials_file or api_key_value:
                raise ValueError(
                    "When providing a transport instance, "
                    "provide its credentials directly."
                )
            if client_options.scopes:
                raise ValueError(
                    "When providing a transport instance, provide its scopes "
                    "directly."
                )
            self._transport = transport
        else:
            import google.auth._default  # type: ignore

            if api_key_value and hasattr(
                google.auth._default, "get_api_key_credentials"
            ):
                credentials = google.auth._default.get_api_key_credentials(
                    api_key_value
                )

            Transport = type(self).get_transport_class(transport)
            self._transport = Transport(
                credentials=credentials,
                credentials_file=client_options.credentials_file,
                host=api_endpoint,
                scopes=client_options.scopes,
                client_cert_source_for_mtls=client_cert_source_func,
                quota_project_id=client_options.quota_project_id,
                client_info=client_info,
                always_use_jwt_access=True,
            )

    def create_specialist_pool(
        self,
        request: Union[
            specialist_pool_service.CreateSpecialistPoolRequest, dict
        ] = None,
        *,
        parent: str = None,
        specialist_pool: gca_specialist_pool.SpecialistPool = None,
        retry: OptionalRetry = gapic_v1.method.DEFAULT,
        timeout: float = None,
        metadata: Sequence[Tuple[str, str]] = (),
    ) -> gac_operation.Operation:
        r"""Creates a SpecialistPool.

        .. code-block:: python

            from google.cloud import aiplatform_v1

            def sample_create_specialist_pool():
                # Create a client
                client = aiplatform_v1.SpecialistPoolServiceClient()

                # Initialize request argument(s)
                specialist_pool = aiplatform_v1.SpecialistPool()
                specialist_pool.name = "name_value"
                specialist_pool.display_name = "display_name_value"

                request = aiplatform_v1.CreateSpecialistPoolRequest(
                    parent="parent_value",
                    specialist_pool=specialist_pool,
                )

                # Make the request
                operation = client.create_specialist_pool(request=request)

                print("Waiting for operation to complete...")

                response = operation.result()

                # Handle the response
                print(response)

        Args:
            request (Union[google.cloud.aiplatform_v1.types.CreateSpecialistPoolRequest, dict]):
                The request object. Request message for
                [SpecialistPoolService.CreateSpecialistPool][google.cloud.aiplatform.v1.SpecialistPoolService.CreateSpecialistPool].
            parent (str):
                Required. The parent Project name for the new
                SpecialistPool. The form is
                ``projects/{project}/locations/{location}``.

                This corresponds to the ``parent`` field
                on the ``request`` instance; if ``request`` is provided, this
                should not be set.
            specialist_pool (google.cloud.aiplatform_v1.types.SpecialistPool):
                Required. The SpecialistPool to
                create.

                This corresponds to the ``specialist_pool`` field
                on the ``request`` instance; if ``request`` is provided, this
                should not be set.
            retry (google.api_core.retry.Retry): Designation of what errors, if any,
                should be retried.
            timeout (float): The timeout for this request.
            metadata (Sequence[Tuple[str, str]]): Strings which should be
                sent along with the request as metadata.

        Returns:
            google.api_core.operation.Operation:
                An object representing a long-running operation.

                The result type for the operation will be :class:`google.cloud.aiplatform_v1.types.SpecialistPool` SpecialistPool represents customers' own workforce to work on their data
                   labeling jobs. It includes a group of specialist
                   managers and workers. Managers are responsible for
                   managing the workers in this pool as well as
                   customers' data labeling jobs associated with this
                   pool. Customers create specialist pool as well as
                   start data labeling jobs on Cloud, managers and
                   workers handle the jobs using CrowdCompute console.

        """
        # Create or coerce a protobuf request object.
        # Quick check: If we got a request object, we should *not* have
        # gotten any keyword arguments that map to the request.
        has_flattened_params = any([parent, specialist_pool])
        if request is not None and has_flattened_params:
            raise ValueError(
                "If the `request` argument is set, then none of "
                "the individual field arguments should be set."
            )

        # Minor optimization to avoid making a copy if the user passes
        # in a specialist_pool_service.CreateSpecialistPoolRequest.
        # There's no risk of modifying the input as we've already verified
        # there are no flattened fields.
        if not isinstance(request, specialist_pool_service.CreateSpecialistPoolRequest):
            request = specialist_pool_service.CreateSpecialistPoolRequest(request)
            # If we have keyword arguments corresponding to fields on the
            # request, apply these.
            if parent is not None:
                request.parent = parent
            if specialist_pool is not None:
                request.specialist_pool = specialist_pool

        # Wrap the RPC method; this adds retry and timeout information,
        # and friendly error handling.
        rpc = self._transport._wrapped_methods[self._transport.create_specialist_pool]

        # Certain fields should be provided within the metadata header;
        # add these here.
        metadata = tuple(metadata) + (
            gapic_v1.routing_header.to_grpc_metadata((("parent", request.parent),)),
        )

        # Send the request.
        response = rpc(request, retry=retry, timeout=timeout, metadata=metadata,)

        # Wrap the response in an operation future.
        response = gac_operation.from_gapic(
            response,
            self._transport.operations_client,
            gca_specialist_pool.SpecialistPool,
            metadata_type=specialist_pool_service.CreateSpecialistPoolOperationMetadata,
        )

        # Done; return the response.
        return response

    def get_specialist_pool(
        self,
        request: Union[specialist_pool_service.GetSpecialistPoolRequest, dict] = None,
        *,
        name: str = None,
        retry: OptionalRetry = gapic_v1.method.DEFAULT,
        timeout: float = None,
        metadata: Sequence[Tuple[str, str]] = (),
    ) -> specialist_pool.SpecialistPool:
        r"""Gets a SpecialistPool.

        .. code-block:: python

            from google.cloud import aiplatform_v1

            def sample_get_specialist_pool():
                # Create a client
                client = aiplatform_v1.SpecialistPoolServiceClient()

                # Initialize request argument(s)
                request = aiplatform_v1.GetSpecialistPoolRequest(
                    name="name_value",
                )

                # Make the request
                response = client.get_specialist_pool(request=request)

                # Handle the response
                print(response)

        Args:
            request (Union[google.cloud.aiplatform_v1.types.GetSpecialistPoolRequest, dict]):
                The request object. Request message for
                [SpecialistPoolService.GetSpecialistPool][google.cloud.aiplatform.v1.SpecialistPoolService.GetSpecialistPool].
            name (str):
                Required. The name of the SpecialistPool resource. The
                form is
                ``projects/{project}/locations/{location}/specialistPools/{specialist_pool}``.

                This corresponds to the ``name`` field
                on the ``request`` instance; if ``request`` is provided, this
                should not be set.
            retry (google.api_core.retry.Retry): Designation of what errors, if any,
                should be retried.
            timeout (float): The timeout for this request.
            metadata (Sequence[Tuple[str, str]]): Strings which should be
                sent along with the request as metadata.

        Returns:
            google.cloud.aiplatform_v1.types.SpecialistPool:
                SpecialistPool represents customers'
                own workforce to work on their data
                labeling jobs. It includes a group of
                specialist managers and workers.
                Managers are responsible for managing
                the workers in this pool as well as
                customers' data labeling jobs associated
                with this pool. Customers create
                specialist pool as well as start data
                labeling jobs on Cloud, managers and
                workers handle the jobs using
                CrowdCompute console.

        """
        # Create or coerce a protobuf request object.
        # Quick check: If we got a request object, we should *not* have
        # gotten any keyword arguments that map to the request.
        has_flattened_params = any([name])
        if request is not None and has_flattened_params:
            raise ValueError(
                "If the `request` argument is set, then none of "
                "the individual field arguments should be set."
            )

        # Minor optimization to avoid making a copy if the user passes
        # in a specialist_pool_service.GetSpecialistPoolRequest.
        # There's no risk of modifying the input as we've already verified
        # there are no flattened fields.
        if not isinstance(request, specialist_pool_service.GetSpecialistPoolRequest):
            request = specialist_pool_service.GetSpecialistPoolRequest(request)
            # If we have keyword arguments corresponding to fields on the
            # request, apply these.
            if name is not None:
                request.name = name

        # Wrap the RPC method; this adds retry and timeout information,
        # and friendly error handling.
        rpc = self._transport._wrapped_methods[self._transport.get_specialist_pool]

        # Certain fields should be provided within the metadata header;
        # add these here.
        metadata = tuple(metadata) + (
            gapic_v1.routing_header.to_grpc_metadata((("name", request.name),)),
        )

        # Send the request.
        response = rpc(request, retry=retry, timeout=timeout, metadata=metadata,)

        # Done; return the response.
        return response

    def list_specialist_pools(
        self,
        request: Union[specialist_pool_service.ListSpecialistPoolsRequest, dict] = None,
        *,
        parent: str = None,
        retry: OptionalRetry = gapic_v1.method.DEFAULT,
        timeout: float = None,
        metadata: Sequence[Tuple[str, str]] = (),
    ) -> pagers.ListSpecialistPoolsPager:
        r"""Lists SpecialistPools in a Location.

        .. code-block:: python

            from google.cloud import aiplatform_v1

            def sample_list_specialist_pools():
                # Create a client
                client = aiplatform_v1.SpecialistPoolServiceClient()

                # Initialize request argument(s)
                request = aiplatform_v1.ListSpecialistPoolsRequest(
                    parent="parent_value",
                )

                # Make the request
                page_result = client.list_specialist_pools(request=request)

                # Handle the response
                for response in page_result:
                    print(response)

        Args:
            request (Union[google.cloud.aiplatform_v1.types.ListSpecialistPoolsRequest, dict]):
                The request object. Request message for
                [SpecialistPoolService.ListSpecialistPools][google.cloud.aiplatform.v1.SpecialistPoolService.ListSpecialistPools].
            parent (str):
                Required. The name of the SpecialistPool's parent
                resource. Format:
                ``projects/{project}/locations/{location}``

                This corresponds to the ``parent`` field
                on the ``request`` instance; if ``request`` is provided, this
                should not be set.
            retry (google.api_core.retry.Retry): Designation of what errors, if any,
                should be retried.
            timeout (float): The timeout for this request.
            metadata (Sequence[Tuple[str, str]]): Strings which should be
                sent along with the request as metadata.

        Returns:
            google.cloud.aiplatform_v1.services.specialist_pool_service.pagers.ListSpecialistPoolsPager:
                Response message for
                [SpecialistPoolService.ListSpecialistPools][google.cloud.aiplatform.v1.SpecialistPoolService.ListSpecialistPools].

                Iterating over this object will yield results and
                resolve additional pages automatically.

        """
        # Create or coerce a protobuf request object.
        # Quick check: If we got a request object, we should *not* have
        # gotten any keyword arguments that map to the request.
        has_flattened_params = any([parent])
        if request is not None and has_flattened_params:
            raise ValueError(
                "If the `request` argument is set, then none of "
                "the individual field arguments should be set."
            )

        # Minor optimization to avoid making a copy if the user passes
        # in a specialist_pool_service.ListSpecialistPoolsRequest.
        # There's no risk of modifying the input as we've already verified
        # there are no flattened fields.
        if not isinstance(request, specialist_pool_service.ListSpecialistPoolsRequest):
            request = specialist_pool_service.ListSpecialistPoolsRequest(request)
            # If we have keyword arguments corresponding to fields on the
            # request, apply these.
            if parent is not None:
                request.parent = parent

        # Wrap the RPC method; this adds retry and timeout information,
        # and friendly error handling.
        rpc = self._transport._wrapped_methods[self._transport.list_specialist_pools]

        # Certain fields should be provided within the metadata header;
        # add these here.
        metadata = tuple(metadata) + (
            gapic_v1.routing_header.to_grpc_metadata((("parent", request.parent),)),
        )

        # Send the request.
        response = rpc(request, retry=retry, timeout=timeout, metadata=metadata,)

        # This method is paged; wrap the response in a pager, which provides
        # an `__iter__` convenience method.
        response = pagers.ListSpecialistPoolsPager(
            method=rpc, request=request, response=response, metadata=metadata,
        )

        # Done; return the response.
        return response

    def delete_specialist_pool(
        self,
        request: Union[
            specialist_pool_service.DeleteSpecialistPoolRequest, dict
        ] = None,
        *,
        name: str = None,
        retry: OptionalRetry = gapic_v1.method.DEFAULT,
        timeout: float = None,
        metadata: Sequence[Tuple[str, str]] = (),
    ) -> gac_operation.Operation:
        r"""Deletes a SpecialistPool as well as all Specialists
        in the pool.

        .. code-block:: python

            from google.cloud import aiplatform_v1

            def sample_delete_specialist_pool():
                # Create a client
                client = aiplatform_v1.SpecialistPoolServiceClient()

                # Initialize request argument(s)
                request = aiplatform_v1.DeleteSpecialistPoolRequest(
                    name="name_value",
                )

                # Make the request
                operation = client.delete_specialist_pool(request=request)

                print("Waiting for operation to complete...")

Answer: response = operation.result()

<think>
The sample code for delete_specialist_pool follows the same pattern as other sample methods: after initiating the operation and printing a waiting message, the next step is to retrieve the result of the long-running operation. This is done by calling operation.result() and assigning it to a variable, typically named response.
</think>
response = operation.result()