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Judul : How To Practise Thread Pools Using Coffee 1.5 Executor Framework - Example Tutorial
link : How To Practise Thread Pools Using Coffee 1.5 Executor Framework - Example Tutorial

How To Practise Thread Pools Using Coffee 1.5 Executor Framework - Example Tutorial

Java 1.5 introduced Thread puddle inwards Java inwards the shape of Executor framework, which allows Java programmer to decouple submission of a undertaking to execution of the task. If you lot are doing server side programming inwards Java than Thread puddle is an of import concept to hold scalability, robustness, as well as stability of the system. For those, who are non familiar amongst thread puddle inwards Java or concept of thread puddle hither is i liner, Thread puddle inwards Java is a puddle of worker threads, which is ready to perform whatever undertaking given to them, to a greater extent than oftentimes than non inwards the shape of implementation of Runnable or Callable interface. Since Java supports multithreading inwards programming linguistic communication itself, it allows multiple threads to run concurrently as well as perform parallel processing of the task. In this article, nosotros volition acquire next things close thread puddle inwards Java :

1. What is Thread puddle inwards Java?
2. Why hit nosotros demand Thread puddle inwards Java ?
3. What is Executor framework inwards Java 5?
4. How to create fixed size thread puddle using Executor framework inwards Java?
5. Benefits of using Thread Pool inwards Java?

What is Thread Pool inwards Java as well as why nosotros demand it

As I said Thread puddle is a puddle of already created worker thread ready to hit the job. The thread puddle is i of essential facility whatever multi-threaded server side Java application requires. One illustration of using thread puddle is creating a spider web server, which processes customer request. If you lot are familiar amongst socket programming thence you lot know that ServerSocket.accept() is blocking method as well as blocks until a socket connecter made. 

If solely i thread is used to procedure customer request, than it afterwards boundary how many customer tin access server concurrently. In lodge to back upward large give away of clients, you lot may determine to role i thread per asking paradigm, inwards which each asking is processed yesteryear dissever Thread, but this require Thread to survive created, when asking arrived.  Since creation of Thread is fourth dimension consuming process, it delays asking processing. 

It too limits give away of clients based upon how many thread per JVM is allowed, which is plainly a express number. Thread puddle solves this occupation for you, It creates Thread as well as create out them. Instead of creating Thread as well as discarding them in i lawsuit undertaking is done, thread-pool reuses threads inwards shape of worker thread. 

Since Thread are normally created as well as pooled when application starts, your server tin forthwith showtime asking processing, which tin farther improve server’s reply time. Apart from this, at that topographic point are several other benefits of using Thread puddle inwards Java applications, which nosotros volition encounter inwards subsequent section. 

In short, nosotros demand thread pools to ameliorate mange threads as well as decoupling undertaking submission from execution. Thread puddle as well as Executor framework introduced inwards Java five is an fantabulous thread puddle provided yesteryear library.

Java Thread Pool - Executor Framework inwards Java 5

Java five introduced several useful features similar Enum, Generics, Variable arguments as well as several concurrency collections as well as utilities similar ConcurrentHashMap as well as BlockingQueue etc, It too introduced a total characteristic built-in Thread Pool framework commonly known every bit Executor framework. 

The gist of this thread puddle framework is Executor interface which defines an abstraction of undertaking execution amongst method execute(Runnable task) as well as ExecutorService which extends Executor to add together diverse life-cycle as well as thread puddle administration facilities similar shutting downwards thread pool. 

Executor framework too provides a static utility class called Executors ( similar to Collections) which provides several static mill method to create diverse type of Thread Pool implementation inwards Java e.g. fixed size thread pool, cached thread puddle as well as scheduled thread pool. Runnable as well as Callable interface are used to stand upward for undertaking executed yesteryear worker thread managed inwards these Thread pools. 


Interesting indicate close Executor framework is that, it is based on Producer consumer blueprint pattern, where application thread produces undertaking as well as worker thread consumers or execute those task, So it too suffers amongst limitation of Producer consumer undertaking similar if production speed is substantially higher than consumption than you lot may run OutOfMemory because of queued task, of course of report solely if your queue is unbounded.

How to create fixed size thread puddle using Executor framework inwards Java?

Creating fixed size thread puddle using Java five Executor framework is pretty slowly because of static mill methods provided yesteryear Executors class. All you lot demand to hit is define your undertaking which you lot desire to execute concurrently as well as than submit that undertaking to ExecutorService. from them Thread puddle volition convey attention of how to execute that task, it tin survive executed yesteryear whatever complimentary worker thread as well as if you lot are interested inwards outcome you lot tin enquiry Future object returned yesteryear submit() method. Executor framework too provides unlike form of Thread Pool e.g. SingleThreadExecutor which creates merely i worker thread or CachedThreadPool which creates worker threads every bit as well as when necessary. You tin too depository fiscal establishment check  Java documentation of Executor Framework for consummate details of services provided yesteryear this API. Java concurrency inwards Practice also has a yoke of chapters dedicated to the effective role of Java five Executor framework, which is worth reading for whatever senior Java developer.

Example of Thread Pool inwards Java

Here is an illustration of Thread puddle inwards Java, which uses Executor framework of Java five to create a fixed thread puddle amongst a give away of worker thread every bit 10. It volition thence create undertaking as well as submit that to Thread puddle for execution:

public shape ThreadPoolExample {

    public static void main(String args[]) {

       ExecutorService service = Executors.newFixedThreadPool(10);

       for (int i =0; i<100; i++){

           service.submit(new Task(i));

       }

    }

  

}

final shape Task implements Runnable{

    private int taskId;

  

    public Task(int id){

        this.taskId = id;

    }

  

    @Override

    public void run() {

        System.out.println("Task ID : " + this.taskId +" performed yesteryear " 
                           + Thread.currentThread().getName());

    }

  

}

Output:

Task ID : 0 performed yesteryear pool-1-thread-1

Task ID : 3 performed yesteryear pool-1-thread-4

Task ID : 2 performed yesteryear pool-1-thread-3

Task ID : 1 performed yesteryear pool-1-thread-2

Task ID : 5 performed yesteryear pool-1-thread-6

Task ID : 4 performed yesteryear pool-1-thread-5

If you lot await at the output of this Java illustration you lot volition uncovering unlike threads from thread puddle are executing tasks.

Benefits of Thread Pool inwards Java

Thread Pool offers several hit goodness to Java application, biggest of them is separating submission of a undertaking to execution of the undertaking ,which results if to a greater extent than loose coupled as well as flexible blueprint than tightly coupled create as well as execute pattern. Here are merely about to a greater extent than benefits of using Thread puddle inwards Java:

1) Use of Thread Pool reduces reply fourth dimension yesteryear avoiding thread creation during asking or undertaking processing.

2) Use of Thread Pool allows you lot to alter your execution policy every bit you lot need. you lot tin become from single thread to multiple threads yesteryear merely replacing ExecutorService implementation.

3) Thread Pool inwards Java application increases the stability of the organization yesteryear creating a configured give away of threads decided based on organization charge as well as available resource.

4) Thread Pool frees application developer from thread administration materials as well as allows to focus on occupation organization logic.

That's all on Thread puddle inwards Java 5. nosotros receive got seen what is thread puddle inwards Java, what is executor framework inwards coffee 5, how to create thread puddle inwards Java as well as merely about benefits of using thread puddle inwards Java application. no incertitude cognition of thread puddle is essential for a server side gist Java developer as well as I propose reading Java Threads as well as Concurrency Practice inwards Java to acquire to a greater extent than close concurrency as well as thread pool.

Further Learning
Multithreading as well as Parallel Computing inwards Java
Java Concurrency inwards Practice - The Book
Applying Concurrency as well as Multi-threading to Common Java Patterns
Java Concurrency inwards Practice Course yesteryear Heinz Kabutz

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