How to use concurrency framework to simplify concurrent programming in Java concurrent programming?

In order to simplify concurrent programming, Java provides a rich concurrency framework. Threads (Thread class) represent lightweight processes that can execute code independently. Executor services (ExecutorService interface) allow managing concurrent tasks in a scalable way. Runnable interface (Runnable interface) defines the code executed by the thread. In practical cases, ExecutorService and Runnable can be used to process tasks in parallel, while ReentrantLock can be used to synchronously access shared resources.

Java Concurrent programming uses a concurrency framework to simplify concurrent programming

Parallel programming is crucial in modern software development, Java provides A rich concurrency framework is provided to simplify parallel programming. This article will introduce common classes in the Java concurrency framework, and show how to use these classes to simplify concurrent programming through a practical case.

Java Concurrency Framework

Thread

Thread class represents a lightweight process that can be executed independently of the main program. Each thread has its own memory stack and register set, and can execute code concurrently.

ExecutorService

ExecutorService The interface provides methods for managing threads, allowing developers to manage concurrent tasks in a reusable and scalable way.

Runnable

Runnable The interface defines the code that the thread needs to execute. Any class that implements this interface can be used as a thread's task.

Practical case

Processing a large number of tasks in parallel

Suppose we have a task list that needs to be processed concurrently. We can use ExecutorService and Runnable to simplify parallel processing.

// 创建一个 ExecutorService，最大允许 10 个同时运行的线程
ExecutorService executorService = Executors.newFixedThreadPool(10);

// 创建一个 Runnable 任务，用于处理一个任务
Runnable task = new Runnable() {
    @Override
    public void run() {
        // 处理任务
    }
};

// 提交任务到 ExecutorService
for (Task task : tasks) {
    executorService.submit(task);
}

// 等待所有任务完成
executorService.shutdown();
executorService.awaitTermination(1, TimeUnit.DAYS);

In the above code, we use an ExecutorService with a fixed thread pool size to limit the number of concurrent threads. We create a task that implements the Runnable interface and submit it to ExecutorService. When all tasks are completed, ExecutorService will automatically shut down.

Use locks to achieve synchronized access

If multiple threads need to access shared resources at the same time, we need to use a lock mechanism to ensure synchronous access to data. Java provides the ReentrantLock class to implement reentrant locks.

// 创建一个 ReentrantLock 对象
ReentrantLock lock = new ReentrantLock();

// 进入临界区
lock.lock();
try {
    // 访问共享资源
} finally {
    // 离开临界区
    lock.unlock();
}

In the above code, we create a ReentrantLock object and use the lock() and unlock() methods to control access to the share Critical section of resources.

Summary

By using the Java concurrency framework, we can simplify parallel programming and achieve efficient parallel processing and synchronization control. Classes such as ExecutorService, Runnable, and ReentrantLock provide standards-based object-oriented interfaces that make concurrent programming easier and more manageable.

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