JavaJDK多任务执行框架（六）

 

class Temp extends Thread {
    public void run() {
        System.out.println("run");
    }
}
public class UseExecutors {
    public static void main(String[] args) {
        ExecutorService pool = Executors.newSingleThreadExecutor();
        //ThreadPoolExecutor
        Temp command = new Temp();
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);

        ScheduledFuture<?> scheduleTask = scheduler.scheduleWithFixedDelay(command, 5, 1, TimeUnit.SECONDS);
    }
}

　　

 

 

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class UseThreadPoolExecutor1 {
    public static void main(String[] args) {
        /**
         * 在使用有界队列时，若有新的任务需要执行，如果线程池实际线程数小于corePoolSize，则优先创建线程，
         * 若大于corePoolSize，则会将任务加入队列，
         * 若队列已满，则在总线程数不大于maximumPoolSize的前提下，创建新的线程，
         * 若线程数大于maximumPoolSize，则执行拒绝策略。或其他自定义方式。
         *
         */
        ThreadPoolExecutor pool = new ThreadPoolExecutor(
                1, 				//coreSize
                2, 				//MaxSize
                60, 			//60
                TimeUnit.SECONDS,
                new ArrayBlockingQueue<Runnable>(3)			//指定一种队列 （有界队列）
                //new LinkedBlockingQueue<Runnable>()
                , new MyRejected()
                //, new DiscardOldestPolicy()
        );

        MyTask mt1 = new MyTask(1, "任务1");
        MyTask mt2 = new MyTask(2, "任务2");
        MyTask mt3 = new MyTask(3, "任务3");
        MyTask mt4 = new MyTask(4, "任务4");
        MyTask mt5 = new MyTask(5, "任务5");
        MyTask mt6 = new MyTask(6, "任务6");

        pool.execute(mt1);
        pool.execute(mt2);
        pool.execute(mt3);
        pool.execute(mt4);
        pool.execute(mt5);
        pool.execute(mt6);

        pool.shutdown();
    }
}

　　

import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;

public class MyRejected implements RejectedExecutionHandler {
    public MyRejected(){
    }

    @Override
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
        System.out.println("自定义处理..");
        System.out.println("当前被拒绝任务为：" + r.toString());
    }
}

　　

public class MyTask implements Runnable{
    private int taskId;
    private String taskName;

    public MyTask(int taskId, String taskName){
        this.taskId = taskId;
        this.taskName = taskName;
    }

    public int getTaskId() {
        return taskId;
    }

    public void setTaskId(int taskId) {
        this.taskId = taskId;
    }

    public String getTaskName() {
        return taskName;
    }

    public void setTaskName(String taskName) {
        this.taskName = taskName;
    }

    @Override
    public void run() {
        try {
            System.out.println("run taskId =" + this.taskId);
            Thread.sleep(5*1000);
            //System.out.println("end taskId =" + this.taskId);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public String toString(){
        return Integer.toString(this.taskId);
    }
}

　　

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class UseThreadPoolExecutor2 implements Runnable{

	private static AtomicInteger count = new AtomicInteger(0);
	
	@Override
	public void run() {
		try {
			int temp = count.incrementAndGet();
			System.out.println("任务" + temp);
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) throws Exception{
		//System.out.println(Runtime.getRuntime().availableProcessors());
		BlockingQueue<Runnable> queue = 
				//new LinkedBlockingQueue<Runnable>();
				new ArrayBlockingQueue<Runnable>(10);
		ExecutorService executor  = new ThreadPoolExecutor(
					5, 		//core
					10, 	//max
					120L, 	//2fenzhong
					TimeUnit.SECONDS,
					queue);
		
		for(int i = 0 ; i < 20; i++){
			executor.execute(new UseThreadPoolExecutor2());
		}
		Thread.sleep(1000);
		System.out.println("queue size:" + queue.size());		//10
		Thread.sleep(2000);
	}
}

　　Executor框架：