ThreadPoolExecutor 使用

簡寫:

package com.vipsoft.Thread;

import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;

public class ThreadPoolExecutorTest {

    public static void main(String[] args) throws Exception {
        ThreadPoolExecutor executor = new ThreadPoolExecutor(
                2,
                4,
                10L,
                TimeUnit.SECONDS,
                new LinkedBlockingQueue<Runnable>(2),
                new ThreadFactory() {
                    private final AtomicInteger mThreadNum = new AtomicInteger(1);

                    @Override
                    public Thread newThread(Runnable r) {
                        Thread t = new Thread(r, "Thread-" + mThreadNum.getAndIncrement());
                        System.out.println(t.getName() + " has been created");
                        return t;
                    }
                },
                new RejectedExecutionHandler() {
                    @Override
                    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
                        // 可做日誌記錄等
                        System.err.println(r.toString() + " rejected " + executor.getTaskCount());
                    }
                });

        executor.prestartAllCoreThreads(); // 預啓動所有核心線程

        for (int i = 1; i <= 10; i++) {
            final String taskName = String.valueOf(i);
            executor.execute(new Runnable() {
                @Override
                public void run() {
                    try {
                        System.out.println(this.toString() + " is running!");
                        Thread.sleep(3000); //讓任務執行慢點
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public String toString() {
                    return "MyTask [name=" + taskName + "]";
                }
            });
        }

        System.in.read(); //阻塞主線程
    }

}

 

常規寫法:

package com.vipsoft.Thread;

import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;

public class ThreadPoolExecutorTest {

    public static void main(String[] args) throws Exception {
        int corePoolSize = 2;
        int maximumPoolSize = 4;
        long keepAliveTime = 10;
        TimeUnit unit = TimeUnit.SECONDS;
        BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<>(2);
        ThreadFactory threadFactory = new MyTreadFactory();
        RejectedExecutionHandler handler = new MyPolicy();
        ThreadPoolExecutor executor = new ThreadPoolExecutor(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory, handler);
        executor.prestartAllCoreThreads(); // 預啓動所有核心線程
        for (int i = 1; i <= 10; i++) {
            MyTask task = new MyTask(String.valueOf(i));
            executor.execute(task);
        }
        System.in.read(); //阻塞主線程
    }

    static class MyTreadFactory implements ThreadFactory {

        private final AtomicInteger mThreadNum = new AtomicInteger(1);

        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(r, "Thread-" + mThreadNum.getAndIncrement());
            System.out.println(t.getName() + " has been created");
            return t;
        }
    }

    public static class MyPolicy implements RejectedExecutionHandler {

        public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
            // 可做日誌記錄等
            System.err.println(r.toString() + " rejected " + e.getTaskCount());
        }
    }

    static class MyTask implements Runnable {
        private String name;

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

        @Override
        public void run() {
            try {
                System.out.println(this.toString() + " is running!");
                Thread.sleep(3000); //讓任務執行慢點
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        @Override
        public String toString() {
            return "MyTask [name=" + this.name + "]";
        }
    }
}

 

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