如何自定义ExecutorService

要自定义 ExecutorService，您需要遵循以下步骤：

1. 创建一个实现了 Runnable 或 Callable 接口的任务类。这个类将包含您要执行的任务逻辑。

public class MyTask implements Runnable {
    @Override
    public void run() {
        // 任务逻辑
    }
}

2. 创建一个实现了 ThreadFactory 接口的工厂类。这个类将负责创建新的线程实例。

import java.util.concurrent.ThreadFactory;

public class MyThreadFactory implements ThreadFactory {
    private int counter = 0;
    private String namePrefix;

    public MyThreadFactory(String namePrefix) {
        this.namePrefix = namePrefix;
    }

    @Override
    public Thread newThread(Runnable r) {
        Thread t = new Thread(r, namePrefix + "-" + counter++);
        t.setDaemon(false);
        t.setPriority(Thread.NORM_PRIORITY);
        return t;
    }
}

3. 使用 ThreadPoolExecutor 类创建一个自定义的 ExecutorService。ThreadPoolExecutor 提供了许多参数，允许您自定义线程池的行为。

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class CustomExecutorService {
    public static void main(String[] args) {
        int corePoolSize = 5;
        int maximumPoolSize = 10;
        long keepAliveTime = 60L;
        TimeUnit timeUnit = TimeUnit.SECONDS;
        BlockingQueue<Runnable> workQueue = new LinkedBlockingQueue<>(100);
        ThreadFactory threadFactory = new MyThreadFactory("MyThread");

        ThreadPoolExecutor executorService = new ThreadPoolExecutor(
                corePoolSize,
                maximumPoolSize,
                keepAliveTime,
                timeUnit,
                workQueue,
                threadFactory
        );

        // 提交任务
        for (int i = 0; i < 20; i++) {
            executorService.submit(new MyTask());
        }

        // 关闭 ExecutorService
        executorService.shutdown();
    }
}

在这个例子中，我们创建了一个自定义的线程工厂和一个具有自定义参数的 ThreadPoolExecutor。然后，我们提交了 20 个任务，并在完成后关闭了 ExecutorService。您可以根据需要调整参数和任务逻辑。