---
title: API Services & User Interface
---
flowchart LR
    %% API Services and User Interface Pipeline
    %% This diagram focuses on the serving and frontend aspects of the MLOps architecture

    %% Model Registry and Serving
    subgraph ModelServingLayer["Model Registry & Serving"]
        direction TB
        ModelRegistry[("Model Registry")]
        ModelServing["Model Serving"]
    end

    %% API Services
    subgraph APILayer["API Services"]
        direction TB
        FastAPI["FastAPI"]
        APIEndpoints["API Endpoints"]
        APITests["API Tests"]
    end

    %% User Interface
    subgraph UILayer["User Interface"]
        direction TB
        React["React Frontend"]
        UserInterface["Interactive UI"]
        Recommendations["Book Recommendations"]
    end

    %% Containers for Deployment
    subgraph DeploymentContainers["Deployment Containers"]
        direction TB
        APIContainer["API Container"]
        ReactContainer["Frontend Container"]
    end

    %% CI/CD for API and UI
    subgraph CICD["CI/CD Pipeline"]
        direction TB
        GitHubActions["GitHub Actions"]
        APITestWorkflow["API Test Workflow"]
    end

    %% Relationships
    ModelRegistry -->|loaded by| ModelServing
    ModelServing -->|powers| APIEndpoints
    FastAPI -->|hosts| APIEndpoints
    APIEndpoints -->|validated by| APITests
    APIEndpoints -->|consumed by| React
    React -->|renders| UserInterface
    UserInterface -->|displays| Recommendations

    %% Container relationships
    APIContainer -->|serves| FastAPI
    ReactContainer -->|hosts| React

    %% CI/CD relationships
    GitHubActions -->|runs| APITestWorkflow
    APITestWorkflow -->|validates| APIEndpoints

    %% Docker Compose for deployment
    DockerCompose["DockerCompose_deployment"]
    DockerCompose -->|orchestrates| APIContainer
    DockerCompose -->|orchestrates| ReactContainer

    %% Pipeline DAG relationship to API testing
    PipelineDAG["ML Pipeline DAG"]
    PipelineDAG -->|includes| APITests

    %% Styling
    classDef model fill:#e6550d,stroke:#a63603,stroke-width:2px,color:white
    classDef api fill:#6a51a3,stroke:#54278f,stroke-width:2px,color:white
    classDef ui fill:#3182bd,stroke:#08519c,stroke-width:2px,color:white
    classDef containers fill:#1f77b4,stroke:#145885,stroke-width:2px,color:white
    classDef cicd fill:#9467bd,stroke:#7b3ab7,stroke-width:2px,color:white
    classDef orchestration fill:#2ca02c,stroke:#217821,stroke-width:2px,color:white

    %% Apply styles
    class ModelRegistry,ModelServing model
    class FastAPI,APIEndpoints,APITests api
    class React,UserInterface,Recommendations ui
    class APIContainer,ReactContainer containers
    class GitHubActions,APITestWorkflow cicd
    class DockerCompose,PipelineDAG orchestration