STEP 3.新建监视器线程类，用于定时打印当前线程池的状态
package com.wly.javathread.threadpool;
import java.util.concurrent.ThreadPoolExecutor;
/**
* 一个用于监视ThreadPoolExecutor当前状态的线程
* @author wly
*
*/
public class MyMonitorThread implements Runnable {
private ThreadPoolExecutor executor;
private int seconds;
private boolean run=true;
public MyMonitorThread(ThreadPoolExecutor executor, int delay) {
this.executor = executor;
this.seconds=delay;
}
public void shutdown() {
this.run=false;
}
@Override
public void run() {
while(run) {
System.out.println(
String.format("[monitor] [%d/%d] Active: %d, Completed: %d, Task: %d, isShutdown: %s, isTerminated: %s",
this.executor.getPoolSize(),
this.executor.getCorePoolSize(),
this.executor.getActiveCount(),
this.executor.getCompletedTaskCount(),
this.executor.getTaskCount(),
this.executor.isShutdown(),
this.executor.isTerminated()));
try {
Thread.sleep(seconds*1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
STEP 4.测试线程池类WorkerPool
package com.wly.javathread.threadpool;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class WorkerPool {
public static void main(String args[]) throws InterruptedException{
RejectedExecutionHandlerImpl rejectionHandler = new RejectedExecutionHandlerImpl();
ThreadFactory threadFactory = Executors.defaultThreadFactory();
ThreadPoolExecutor executorPool = new ThreadPoolExecutor(2, 4, 10, TimeUnit.SECONDS
, new ArrayBlockingQueue
(2), threadFactory, rejectionHandler);
MyMonitorThread monitor = new MyMonitorThread(executorPool,3);
Thread monitorThread = new Thread(monitor);
monitorThread.start();
for(int i=0; i<10; i++){
System.out.println("--add task.cmd" + i + "--");
executorPool.execute(new WorkerThread("cmd"+i));
Thread.sleep(100);
}
Thread.sleep(30000);
//关闭线程池
executorPool.shutdown();
Thread.sleep(5000);
//关闭监视线程
monitor.shutdown();
}
}
STEP 5. 运行结果：
--add task.cmd0-- pool-1-thread-1 Start. Command = cmd0 [monitor] [1/2] Active: 1, Completed: 0, Task: 1, isShutdown: false, isTerminated: false --add task.cmd1-- pool-1-thread-2 Start. Command = cmd1 --add task.cmd2-- --add task.cmd3-- --add task.cmd4-- pool-1-thread-3 Start. Command = cmd4 --add task.cmd5-- pool-1-thread-4 Start. Command = cmd5 --add task.cmd6-- cmd6 is rejected --add task.cmd7-- cmd7 is rejected --add task.cmd8-- cmd8 is rejected --add task.cmd9-- cmd9 is rejected [monitor] [4/2] Active: 4, Completed: 0, Task: 6, isShutdown: false, isTerminated: false pool-1-thread-1 End. pool-1-thread-1 Start. Command = cmd2 pool-1-thread-2 End. pool-1-thread-2 Start. Command = cmd3 pool-1-thread-3 End. pool-1-thread-4 End. [monitor] [4/2] Active: 2, Completed: 4, Task: 6, isShutdown: false, isTerminated: false [monitor] [4/2] Active: 2, Completed: 4, Task: 6, isShutdown: false, isTerminated: false pool-1-thread-1 End. pool-1-thread-2 End. [monitor] [4/2] Active: 0, Completed: 6, Task: 6, isShutdown: false, isTerminated: false [monitor] [4/2] Active: 0, Completed: 6, Task: 6, isShutdown: false, isTerminated: false [monitor] [2/2] Active: 0, Completed: 6, Task: 6, isShutdown: false, isTerminated: false [monitor] [0/2] Active: 0, Completed: 6, Task: 6, isShutdown: f