Jakarta Concurrency Framework Guide in Java Class Library

Jakarta Concurrency Framework Guide Guide introduction: In Java development, multi -threaded programming is a common and important task.Jakarta Concurrency is a framework in the Java class library, which aims to help developers write complicated code easier.This article will introduce the use guidelines for the Jakarta Concurrency framework and provide necessary explanations for relevant code and configuration. 1. What is Jakarta Concurrency framework? Jakarta Concurrency framework is a concurrent programming framework for Java developers.It contains a set of classes and interfaces for management and scheduling complication tasks, providing more powerful and flexible concurrency control capabilities. Second, the core component of Jakarta Concurrency 1. Executor: Used to perform concurrent tasks submitted.It provides functions such as implementing threads, pool management and task queues. 2. FUTURE: Indicates the result of an asynchronous computing.It provides methods to check whether the calculation is completed, cancel the calculation, and obtain the calculation results. 3. CompletionService: It is a combination that implements Executor and Future to wait for the complete tasks and handle their results. 4. ThreadFactory: Factory category for creating threads. 5. LOCK: Provides a more flexible mutual lock mechanism than Java's built -in Synchronized keywords. Third, the basic steps to use the Jakarta Concurrency framework 1. Import related dependencies: First of all, you need to add the Jakarta Concurrency framework to the project construction file.For example, in the Maven project, the following dependencies can be added to the POM.XML file: <dependency> <groupId>jakarta.specifications.concurrency</groupId> <artifactId>jakarta.concurrency-api</artifactId> <version>1.0.0</version> </dependency> 2. Create Executor: Use the Executor framework to perform concurrent tasks.You can create different types of Executor through the factory method, such as:: ExecutorService executor = Executors.newFixedThreadPool(5); A fixed -size thread pool is created here, which contains 5 available threads. 3. Submit task: Use Executor to submit the execution task.For example: executor.submit(new RunnableTask()); Here is a task that implements the Runnable interface. 4. Process Future: Get the results of the task.Through the Future object, you can check whether the task is completed, canceled the task, and the execution results of obtaining the task.For example: Future<Integer> future = executor.submit(new CallableTask()); Integer result = future.get (); // Oblock the waiting task to be executed and get the result Here is a task that implements the Callace interface and obtains the execution results of the task through the Future.get () method. 5. Close Executor: After using Executor, it should be correctly closed to release related resources.For example: executor.shutdown(); The Executor is closed here. 4. Example code and related configuration Here are a sample code that uses the Jakarta Concurrency framework: import jakarta.concurrency.*; public class JakartaConcurrencyExample { public static void main(String[] args) throws InterruptedException, ExecutionException { ExecutorService executor = Executors.newFixedThreadPool(5); Future<Integer> future = executor.submit(new CallableTask()); if (future.isDone()) { Integer result = future.get(); System.out.println("Task result: " + result); } executor.shutdown(); } } class CallableTask implements Callable<Integer> { @Override public Integer call() throws Exception { // Execute some time -consuming operations Thread.sleep(1000); return 42; } } In terms of configuration, you need to ensure that the construction document of the project is added to the dependency library of the Jakarta Concurrency framework, as shown in the previous section. in conclusion: This article briefly introduces the guidelines for the use of the Jakarta Concurrency framework.By using this framework, developers can write and manage concurrent code easier.It is hoped that this article can help readers understand the basic concepts of the Jakarta Concurrency framework and apply it correctly in actual projects.