How to use thread pool to implement circular scheduling of tasks in Java 7

How to use thread pools to implement circular scheduling of tasks in Java 7

Introduction:
When developing Java applications, using thread pools can improve task execution efficiency and resource utilization. In Java 7, the thread pool can be used to easily implement circular scheduling of tasks. This article will introduce how to use thread pools to implement circular scheduling of tasks in Java 7, and attach corresponding code examples.

1. Overview:
Thread pool is a multi-thread processing structure that can reuse a fixed number of threads, thereby avoiding frequent creation and destruction of threads and improving application performance and stability. In Java, thread pools can be created and managed using the ThreadPoolExecutor class.

2. Create a thread pool:
In Java 7, there are two ways to create a thread pool: use the static method provided by the Executors class to create a thread pool, or create a thread pool through the constructor of the ThreadPoolExecutor class.

1. Use the Executors class to create a thread pool:

   ExecutorService executor = Executors.newFixedThreadPool(10);

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   The above code creates a thread pool with a fixed size of 10.

2. Use the constructor of the ThreadPoolExecutor class to create a thread pool:

   ThreadPoolExecutor executor = new ThreadPoolExecutor(
    5, //核心线程数
    10, //最大线程数
    60, //线程池中空闲线程等待任务的最长时间
    TimeUnit.SECONDS, //等待时间单位
    new ArrayBlockingQueue<Runnable>(10) //阻塞队列
   );

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   The above code creates a core thread number of 5, a maximum number of threads of 10, and a maximum waiting time of 60 seconds thread pool and uses a bounded blocking queue of size 10.

3. Submit tasks:
After creating the thread pool, we can submit the task by calling the execute() method or submit() method.

1. Use the execute() method to submit a task:

   executor.execute(new Runnable() {
    @Override
    public void run() {
        //执行任务逻辑
    }
   });

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   The above code creates an anonymous inner class that implements the Runnable interface and passes it as a parameter to execute( ) method, thus submitting a task.

2. Use the submit() method to submit a task:

   Future<?> future = executor.submit(new Callable<Object>() {
    @Override
    public Object call() throws Exception {
        //执行任务逻辑
        return null;
    }
   });

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   The above code creates an anonymous inner class that implements the Callable interface and passes it as a parameter to submit( ) method, thus submitting a task. In addition, the submit() method also returns a Future object, which can be used to obtain the results of task execution.

4. Loop scheduling of tasks:
Loop scheduling of tasks can be achieved by using a loop structure in the run() method of the task. The following is a sample code:

public class Task implements Runnable {
    private int count;
    private int maxCount;
    
    public Task(int maxCount) {
        this.maxCount = maxCount;
    }
    
    @Override
    public void run() {
        while(count < maxCount) {
            //执行任务逻辑
            count++;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        int maxCount = 100;
        ExecutorService executor = Executors.newFixedThreadPool(10);
        
        for(int i=0; i<10; i++) {
            executor.execute(new Task(maxCount));
        }
        
        executor.shutdown();
    }
}

The above code creates a task class named Task, which implements circular scheduling of tasks by using a while loop to determine whether count reaches maxCount after each execution of task logic. By creating a thread pool in the main() method of the Main class and submitting multiple Task tasks, you can implement circular scheduling of tasks.

5. Summary:
This article introduces how to use thread pools to implement circular scheduling of tasks in Java 7, by creating thread pools, submitting tasks, and using loop structures in the run() method of tasks. to fulfill. The thread pool can improve task execution efficiency and resource utilization, and is one of the commonly used technologies in developing Java applications. I hope that through the introduction of this article, readers will have a certain understanding of how to use thread pools to implement task cycle scheduling in Java 7, and can flexibly apply it in actual development.

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