Java Exchanger example

Java Exchanger example
Exchanger class is introduced with java 1.5 with other classes such ConcurrentHashMap, CountDownLatch, Semaphores.
Exchanger class is used to exchange object between two threads. Exchanger simply waits until two separate threads calls exchange method, when it happens, it exchanges data supplied by threads.Two threads can pair and swap objects between them. Exchanger class may be useful in genetic algorithms or pipeline design.

It has two overloaded version of exchange method.

  • exchange(V x): It waits for another thread to arrive at exchange point and exchange object with that thread.
  • exchange(V x, long timeout, TimeUnit unit): It waits for another thread for specific time interval provided in the method and exchange object with that thread.
Let’s understand with help of example:

We have two threads i.e. Producer and Consumer and they will exchange Country objects. Producer will create Country objects and Consumer will return dummy country objects.

Let’s first create Country class. It just have one attribute called countryName.
Now we will create main class called ExchangerExampleMain.java and it will have two other classes called Producer and Consumer which will implement runnable interface.
When you run above program, you will get below output.
If you notice, producer has exchanged two country object (India and Bhutan) with consumer and got dummy country objects in return.
If you want to understand more realistic use of Exchanger. Producer and consumer may exchange buffers. When buffer is full, Producer will provide full buffer to consumer and Consumer will return empty buffer in return.


import_contacts

You may also like:

Related Posts

  • Difference between Runnable and Callable in java
    16 December

    Difference between Runnable and Callable in java

    Runnable and Callable interface both are used in the multithreading environment.Callable is available in java.util.concurrent.Callable package and Runnable in java.lang.Thread. Difference between Runnable and Callable interface in java Runnable was introduced in java 1.0 version While Callable is an extended version of Runnable and introduced in java 1.5 to address the limitation of Runnable. Runnable […]

  • 13 June

    Java Executor framework tutorial with example

    Table of ContentsExecutorExecutorServiceScheduledExecutorServiceExecutorsThreadPoolExecutor Java 5 has introduced new framework called Executor Framework for managing threads.We have already seen before how to create a thread. If you have noted, we need to create an object of thread class using new Thread(runnableObject), so we need to create thread object for each task.Imagine a situation where you have […]

  • Java ExecutorCompletionService
    09 June

    Java ExecutorCompletionService

    Table of ContentsWhy you may need to use ExecutorCompletionService:Java ExecutorCompletionService example: In this post, we will see about Java ExecutorCompletionService example. ExecutorCompletionService class implements CompletionService. This class returns Future object in completion order. Why you may need to use ExecutorCompletionService: Let’s understand with the help of scenario: Let’s say you have 5 tasks, you submit it to the […]

  • 05 June

    Java newSingleThreadExecutor example

    Table of ContentsSyntax:Java newSingleThreadExecutor example:Difference between newSingleThreadExecutor and newFixedThreadPool(1): In this tutorial, we will learn about Executor’s newSingleThreadExecutor factory method. In the last tutorial, I have shared an introduction to ThreadPoolExecutor. If you are not aware of concepts of ThreadPoolExecutor, you should go through that first. Executor’s newSingleThreadExecutor factory method : This method returns thread […]

  • 29 May

    Java ScheduledThreadPoolExecutor Example

    Table of ContentsJava ScheduledThreadPoolExecutor Example:ScheduledThreadPoolExecutor’s scheduleAtFixedRate example:ScheduledThreadPoolExecutor’s scheduleWithFixedDelay example: There are multiple ways to schedule a task in java. We have already Java timer to schedule a task but the problem with timers task is that you can execute one task at a time.So if the current task takes longer subsequent job will be delayed. […]

  • Java FutureTask example
    28 May

    Java FutureTask example

    Table of ContentsJava FutureTask example:Explanation: In this tutorial, we will see about Java FutureTask example. FutureTask class has been introduced in JDK 5 with Executor Framework. FutureTask class is the concrete implementation of the Future object and provides methods for start and cancel the task.It also provides method to see if the computation is done […]

Leave a Reply

Your email address will not be published. Required fields are marked *

Subscribe to our newletter

Get quality tutorials to your inbox. Subscribe now.