27 - Multithreading/002 First Multithreading Program Thread & Runnable_en.srt

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Hello.

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Yes, students in this class and will create our first multithreaded program.

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It is time to put our theoretical knowledge on practice and learn new things.

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We'll start from understanding of threat lifecycle and in which states our threat may be and when will

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jump to practical examples.

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You'll have enough knowledge to understand that.

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And this lesson I will show you how to create a threat with five different ways.

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We are going to learn such basic laws for multithreaded in general threat and one of the most important

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interfaces.

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Runnable.

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While showing you examples, I will focus your attention on main properties of threat class to describe

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each state.

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And once we Iran's threats, we will learn with you how we can interact execution of a threat.

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We'll discuss methods that are deprecated for a long time already and that you never should use.

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And also we'll talk about proper ways of threat interaction.

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Today, we're going to have a lot of good examples.

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And as we will go over the examples, I will also explain specifics of some methods and behavior of

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threats.

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Let's start.

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And as I said before, let's start from the understanding the whole lifecycle of a threat is considered

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to be a new one.

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We just created an object of a threat.

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And you know that in Java, everything is an object.

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That's why threat of execution is also an object to run a threat.

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We need to start massive because mass that creates a separate threat of execution within the Java process.

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After that threat is in the running state.

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In this state, we can make our threat not run by turning our threat into waiting state or block state.

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During this course, we will discuss all these scenarios, for example, when threat is blocked and

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when it's waiting for now, you need just to understand that running threat may be put on pause and

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getting back to running state again as engineers will learn how to do this.

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Sometimes threats waiting their chance to update a shared resource.

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Sometimes we want to make a threat, wait until other threats will adjust it of our shared resource.

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And the last possible state of our threat is a Terminator's state.

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This state tells us that threat finished its execution or it was interrupted.

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Is it clear now when you're no threat?

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Life-cycle it is time to write our first.

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Just read an application I open file was named first just writing program.

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I have main message here.

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Let me go line by line and explain you each role here.

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You can see that the first thing that I do here, I declare a variable of type Runnable and initialize

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it with new object of type default.

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Runnable.

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Let me open source code of Runnable type, because you see this time the first time in this course,

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as you can see, this is an interface from the Java version.

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What does a functional interface was only one abasic mass with name.

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Right.

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We see that this method returns nassan and return type is void.

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This is exactly the method that we need to implement and where we need to put a code that will be executed

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in the separate thread to have separate thread, we need to have instructions about what this thread

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is supposed to do and these instructions should be written somewhere.

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This is exactly the method that will be executed by thread.

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Let's now check the source code of a default runnable we see as a default Runnable implements Runnable

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interface.

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Basically, this is my custom clause that gives implementation to run Macel inside this matter.

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I print such text to console.

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I'm a new threat.

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My name is and here I call static method on class will learn this class in a minute.

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But just to finish explanation of this line, current threat is a static method of threat class that

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returns the reference to the threat object.

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And depending on where this method is invoked, we receive the reference to the object of current threat.

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And after that I just call that name method that returns is a name of the threat.

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I want to bring this text to console to prove that we have separate threat of execution.

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One will run our app.

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But before doing that, let's investigate threat glass.

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Let me open the source code of this class.

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The first thing is that you can notice here is that threat also implements Runnable.

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What does this mean?

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This means that the object of threat type also may be executed as a separate threat.

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And this class also has implementation of around MassArt.

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Let's look at it.

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As we can see, the first things that object will try to do is to check whether we have target field

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initialized.

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And if yes, then we'll call run Masset on that object.

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And if not, then we'll just do nothing.

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Target Field has Runnable type and we can see even Kermanshah above this field.

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This is something.

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What will be around so as you can understand, we can do two things here.

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We can pass Runnable object to the threat glass or we can override run Masad in Third-Class, we can

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pass Runnable to this class.

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We are constructor.

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We have really a lot of different versions of constructor for this type.

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And one of the constructor is to accept and initialize target field to store the reference to the Runnable

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object.

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Interesting thing to notice here is that this constructor invokes another version of constructor.

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It passes in reference to the REDgroup.

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We'll discuss a little bit later.

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What does it reference to our Runnable object name of the thread, which consists of the word thread

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dash and the sequential number.

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Is it a static variable name thread in it?

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No, that is incremented every time when the next threatener method and the last argument is a stack

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size zero because according to the recommendation, in case this argument is zero, we have no requirement

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for specific text size for this new threat.

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And the new constructor Interent calls new constructor that passes to more arguments.

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New and true new value is supposed to cover such constructor argument as access control context and

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true value is the flag to indicate whether we need to inherit initial values for inheritable threat

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logos from the construction threat.

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Let me explain what these things meant.

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Access control context is a type that is used to create objects that make system access decisions based

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on the context it encapsulates.

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Check permission Massada that is invoked in the context that access control context encapsulates inside

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is allowed to process was access to resources or access control exception.

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Anyway, this is not the topic for the first lesson of not just reading.

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And this is not what you will use on a daily basis directly while working with me.

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Just read it.

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But just in order to let you know.

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Regarding the second argument inherits read.

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Locals do not pay a lot of attention to this one.

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And this moment will cover concept of threat locals and inheritable threat local separately, but ensured

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this flag is to tell threat whether we need to inherit values from inheritable threat local from the

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construction threat.

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And basically after that we proceed with construction of our threat of execution.

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Besides the construction of Runnable that we have just discussed, we have also different constructors

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that initializes other properties of threat object, for example, threat that takes Runnable and access

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control context, constructor that takes REDgroup and Runnable also another popular constructor for

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the bag and purposes is constructor with Runnable and string.

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String represents the name of the threat and other different variations, including constructors with

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taxes and boolean flag to indicate the state of the inherited threat.

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The locals flag.

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What are the properties?

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The threat glass half.

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If we would scroll to the top of this file, will find properties that we also may use during the configuration

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of the threat.

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You already know about threatening property.

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By the way, here is also new keyword for you.

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Volatile will cover it.

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Do in the separate lesson we have priority property.

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This is a from one to 10 that will be used by threat scheduler to decide what threat is more important

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to work with.

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So this next, however, we never can rely on the priority property when we have concurrent threat executed.

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Let's call this recommendation, but not mandatory direction to follow for threats.

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Catala What is a threat?

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Skalla It is part of GM that decides which threats should run.

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Also, it decides which threats should wait, how it is.

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This is a great question, but probably not for the first practical move.

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This riding lesson will also cover this topic separately.

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The next property here is on by default.

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It is false.

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We will discuss later in this course what demons threats are interrupted.

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Flag is used to indicate where the threat is interrupted and we need to stop its execution or we need

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to proceed execution of a threat.

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Let in this lesson.

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I will also show you how to interact with this property.

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Maxfield's here used by Jovian.

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We will not focus our attention on them in this lesson.

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And probably the one property that we did not talk yet is a threat.

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The group this object is used to groups threats to gather in one group support group forms a three and

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every threat except a regional threat.

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The group has a parent.

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There are also some specific self-locking mechanism for threat in that group, but probably will cover

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this in a separate lesson.

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And it looks like that Tetragon high level of.

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You officer red class and its properties definitely as more things to learn here, but we'll do it gradually

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and with practical examples, case by case.

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Now, let's get back to the demo file here.

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You can see that I created a threat object and positive reference to the Runnable object.

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Why option was a separate class might be needed in this case.

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You can declare some files if needed.

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Also, you can declare constructors and pass external resources to the new objects if needed, because

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by default, ranma, it doesn't take anything as Masset argument.

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And here's just an example of constructor initialization of the state of this object.

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If we want, we can pass any external object to the constructor and use the state of our runnable object

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in one method if needed.

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In such a way you can just share the resource that we shared with this thread.

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This is basically the first way to create a threat object that is ready to be executed and that is in

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your state.

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The next way is another variation of the first one.

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Instead of creating type that implements Runnable, we can just pass instance of anonymous class.

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You can see here that I have similar method implemented.

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Basically nothing special to highlight here.

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And to be honest, this way of creating threat is not very popular.

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The next way to great threat is to extend a new class from the threat and all around Massett, if you

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remember when we were you in threat object, we saw that there is nothing to execute by default if we

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didn't pass the reference to the Runnable object.

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That's why so radically we can just override one method.

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You can see that the current class extends threat clause and we overwrite one method here.

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And after that, the main method is simply create the object of the first sorting program type.

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That's it.

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While this option often described in the literature, don't recommend it to you this way.

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Why?

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Because he extends that class just to overwrite one method.

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Probably it is not the best approach from the single responsibility principle point of view.

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For such purposes we have Runnable type and we can use it to give implementation to run Macit.

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The fourth way to prepare a threat for execution is to use lambda expression to implement around Macit.

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She can see that I created lambda function.

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That takes no arguments and returns nassan.

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Basically I just print the same text and the last, but not least for today, is the way preparing A

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was MassArt reference.

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I have a static method declared in this class with name execute that takes no parameters and that brings

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the same text to cancel.

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I just passing method reference here that meets the definition of Runnable interface.

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It doesn't take any arguments and it returns nassan the same as around Massett.

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In case you are not familiar with lambda functions and method references in Java, but you want to learn

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that.

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Check my functional programming course for Java InGenius.

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We have really a lot of examples that the next thing that you see in this line and a sprinkling of the

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current threat to console and for the sake of example, call run Nassib.

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Remember, Run Masset doesn't start as a threat of execution, only start MassArt starts separate thread.

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But if you would call directly around MassArt, you would just execute run MassArt synchronously.

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And after that I call starts MassArt on each thread that we created here.

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Let's run the program to see what we have got in the console in the first line with the printed text

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from my main threat here you can see the text current threatening is and its name is Main Man is the

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name of the first read that we have in our Java application is the next line is a result of invocation

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of FRAND method.

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And as you can see, threatening is still man.

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That proves that invocation of method doesn't actually start a new threat.

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And to start a new threat, we need to start Macit after you can see multiple lines with different names

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of a threat.

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That is exactly what is returned by getting the same method on the current threat involved from the

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threat.

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And you remember that by default, naming convention for each threat is threat word and sequential number

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of a threat.

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Can you understand now how to run your threat in real life?

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You often use executor's to run and manage.

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Your threats will learn executor's later in this course.

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But what we have learned in this lesson, this is basics that you need to understand before moving further.

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Now, what do we know how?

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To start the threat, let's learn how to interact and stop its execution.

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I have separate file for that was name interrupt them is interesting app that will help you to understand

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how threat interception works.

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Let's start from the main mast.

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The first thing that I do here, create a task for execution.

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I implement it runnable interface in this class for the sake of this demo and not having multiple classes

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in this example.

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I will show you around Massud in the minute after this.

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I create a threat object and start a threat and I won't let the main threat sleep for two seconds and

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interrupt my task after two seconds.

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How I can do this?

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I invoke sleep masset on the threat object.

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This method takes a number of milliseconds as Masset argument.

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Two seconds are equal to two thousand milliseconds.

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Sleep method is our law that in threat class.

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Let's look at the threat clause.

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Source code.

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We have to sleep massas here.

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One was milliseconds only and another one takes two arguments, milliseconds and nanoseconds.

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To be honest, I never used sleep mass.

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It was nanoseconds, but still it is good to know that such method exists.

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Let's get back to our demo file, another really user friendly interface of making sure that sleep is

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to use time unit in from Javitz.

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You can current package.

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This enum represents time duration at the given unit of granularity and provides methods to convert

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across units and perform timing and delay operations.

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In these units, for example, you may perform such operations as making Meinzer slip, and the interface

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allows us to not calculate milliseconds and convert them between seconds and other time units.

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One unit.

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But we can just take time units that we need and parse the value of the specific time unit that we need.

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For example, here is a line similar to the one above.

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It also uses milliseconds time unit and here is a line that use a second time unit.

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And I'm just saying two seconds.

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To be honest, in my opinion, using this API is more preferable.

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And after this line, my main threat is in on the running state, in wait in state and the one threat

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is awaiting as a threat may interrupt it.

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That's why Slakey method maestro so called interrupted exception.

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And that's why Compiler makes us handle this exception case to describe how a system should behave in

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case somebody will interrupt this thread.

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In this example, nobody will interrupt main threat but still interrupted.

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Exception is checked.

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That's why we need Searls declaration here in Maine method because for the sake of this demo, I don't

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want to create try catch block here.

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After that I print a console that I interact as a threat.

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To interrupt as a threat.

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We should call interrupt method interrupt method interruption flag inside the threat object.

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That flag basically has two possible values, true or false.

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With the help of this method, we can change the state of the interaction flag inside the threat and

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the last line and my main threat is print and leave in the console.

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Let's now look at our task and understand how interrupt.

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Masset interrupts execution of the threat.

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I open one method.

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I print text that indicates that I entered one method and the threat is about to execute Vork method.

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I invoke Vork method.

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Let's look at it now.

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Work method is that was the infinite loop.

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After that we just print one word.

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Verkin in f close.

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I check if threat is interrupted is interrupted.

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Matthew Chance is a state of the interaction flat and in case somebody from as a threat called MassArt

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interrupt like we did in our main threat, then this method will return.

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True.

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Right now you already know what is done by interrupt and by is interrupted masses.

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But why do we need interrupted?

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Macit interrupted Massata returns also boolean value and return state of the interaction flac but it

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also clears it and return it back to false.

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So in case what uncommon this line and will executed interruption flag will be turned back to false

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again.

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To interrupt this thread I will keep this line commanded and we'll just leave it as an example for you.

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By the way, I encourage you to download this service code example from the GitHub and run it locally

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on your computer.

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By doing this, you can play with values and comment and comment the lines that you are interested in

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and as always, service code examples in attachments to this lesson.

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OK, so now I believe.

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The difference between these three methods interact is interrupted and interrupted.

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Now pay attention that threat is moved to the white state because and will sleep mass at here.

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And by the way, no matter how long sleep will be, I put one millisecond here for sleep.

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But still, it is enough to interrupt the threat.

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What will happen?

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One threat will be a sleep take into account.

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I'm in this safe block because interrupted FLAC is equal to true and the threat is invading state.

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My threat will be interrupted and interrupted.

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Exceptions will be thrown.

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This line will not be executed never because interrupted exception will be thrown this mass Atheros

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interrupted exception without any handlin to the upper level.

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And here we should print interrupted in the work method and return from around Macit.

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As you can see here, I have tried Kedge Block because sleep mass my throat checked exception and work

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method doesn't handle this potential exception inside.

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Let's run this program now for two seconds.

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Program will bring to console working until threat will be interrupted and once it is interrupted,

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let's see what we have.

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The first thing that happened is threat interruption and even after that you can see that I printed

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reconvert.

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That is because I just changed interaction flac and I still need to wait until the threat will be in

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a waiting mode.

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This text in the main living tells us that Main Street finished its execution and after that we see

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that we enter it if block.

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And here is a status of interrupted flac.

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It is equal to true.

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The next step in our execution is entering the catch block and print and that threat was interrupted

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in the work.

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MassArt.

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That's it.

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So the rule of thumb, when you're creating all rain app, think about what is a logical point in your

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thread to allow other threats to interrupt it.

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In case you have such possibility to introduce this point, do it.

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Usually you would let your threat fall asleep.

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After all, resources are adjusted and state of the system is consistent.

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In this case, there is no harm to interrupt the threat.

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There are some methods that you should never use and that are marked as deprecated but not removed from

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Janicki only because of the backwards compatibility.

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Ziya, stop, suspend and resume.

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These are dangerous masses in terms they are stop, suspend or resume threat execution instantly without

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bothering.

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What process is happening right now inside the threat, taking into account not all operations at ATOMIC

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and performed with one single operation of updating data in the memory.

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You can start somewhere in the middle of data processing in your threat.

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At the meantime, resource will be updated as a threat.

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And when you will resume execution, you may end up with not consistent state of your objects.

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We will talk about atomic operations in adolescence, but I believe you understood that stopping a suspension

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and after that resume and execution of the threat in case it is made some calculation process is not

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the best idea.

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And one more interesting and lasting for today's lesson.

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Probably you saw one comment line here where I invoke June Masset.

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What is it?

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Let me uncommented first and run up one more time.

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What's changed now in this version line?

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Zatarain's in the main Leesville will always be printed.

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Lost.

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Why?

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Because Join Masset also put our main threat in great state until this threat will be completely finished.

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So I gave a command with this line to join.

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This thread does a current one.

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That's why my app will wait until Perry's threat will be completely executed during Masad.

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Also, Masroor interrupted exception, taking into account it puts current threat wait in state and

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other threats might interrupt this threat while it is innervate state.

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Is it clear?

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Basically, that's all what I wanted to share with you in this lesson.

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Let's recap what we have learned today.

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In this lesson, we learned the life cycle of the threat and how state of the threat is changed from

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the new disseminated.

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We learned five ways how to run a threat.

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Also in this lesson, we performed over a year of threat class.

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Now, you know, main properties of this type, we learned a radical interface.

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Now you know how to use it to execute a separate threat.

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And at the end of the lesson, we learned how to interrupt threat.

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Hope you enjoyed the lesson and you like the examples.

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We still have a lot of other things to learn, but.

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I think that they will have enough information to remember, make sure you understand this lesson before

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moving further, because multithreaded is not the easiest topic.

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And we need to be very careful with understanding each concept in sequential order, because it would

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be hard to understand one thing without understanding the previous one.

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Thanks a lot for your attention.

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Have a great day and see you in the next lesson.