Concurrent - Executors - newSingleThreadExecutor()

原创转载请注明出处：http://agilestyle.iteye.com/blog/2343526

使用newSingleThreadExecutor()方法可以创建单一线程池，单一线程池可以实现以队列的方式来执行任务。

SingleThreadPoolTest.java

package org.fool.java.concurrent.executor.single;

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

public class SingleThreadPoolTest {
    public static void main(String[] args) {
        ExecutorService executorService = Executors.newSingleThreadExecutor();

        for (int i = 0; i < 3; i++) {
            executorService.execute(new MyThread(String.valueOf(i + 1)));
        }
    }

    public static class MyThread implements Runnable {

        private String name;

        public MyThread(String name) {
            this.name = name;
        }

        @Override
        public void run() {
            System.out.println(Thread.currentThread().getName() + " name=" + name + " begin " + System.currentTimeMillis());
            System.out.println(Thread.currentThread().getName() + " name=" + name + " end " + System.currentTimeMillis());
        }
    }
}

Run

Note:

执行了3次，但是只有1个线程在运行

使用newSingleThreadExecutor(ThreadFactory threadFactory)定制线程工厂

SingleThreadPoolTest2.java

package org.fool.java.concurrent.executor.single;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

public class SingleThreadPoolTest2 {
    public static void main(String[] args) {
        MyThreadFactory myThreadFactory = new MyThreadFactory();

        ExecutorService executorService = Executors.newSingleThreadExecutor(myThreadFactory);

        for (int i = 0; i < 10; i++) {
            executorService.execute(new Runnable() {
                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName() + " invoked...");
                }
            });
        }

    }

    public static class MyThreadFactory implements ThreadFactory {

        @Override
        public Thread newThread(Runnable r) {
            Thread thread = new Thread(r);
            thread.setName("My Own Thread " + (int) (Math.random() * 10 + 1));

            return thread;
        }
    }
}

Run

Note:

执行了10次，但是只有1个线程在运行