ThreadPoolExecutor 也是一個可以擴展的線程池，它提供了beforeExecute()、afterExecute()、和terminated()3個接口對線程池進行控制。即開始執行前，執行完成後，終止後
具體擴展代碼如下：
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import java.util.concurrent.BlockingQueue;import java.util.concurrent.LinkedBlockingQueue;import java.util.concurrent.ThreadPoolExecutor;import java.util.concurrent.TimeUnit;/** * ThreadPoolExecutor 擴展 * @author tanlk * @date 2017年7月26日下午8:47:39 */public class MyThreadPoolExecutor extends ThreadPoolExecutor { public MyThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue) { super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue); } @Override protected void beforeExecute(Thread t, Runnable r) { System.out.println("beforeExecute MyThread Name:" + t.getName() +",TID:" + t.getId()); } @Override protected void afterExecute(Runnable r, Throwable t) { System.out.println("afterExecute TID:" + Thread.currentThread().getId()); System.out.println("afterExecute PoolSize:" + this.getPoolSize()); } @Override protected void terminated() { System.out.println("terminated"); } public static void main(String[] args) { MyThreadPoolExecutor myThreadPoolExecutor = new MyThreadPoolExecutor(2, 2, 0, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>()); for (int i = 0; i < 10; i++) { myThreadPoolExecutor.submit(new Runnable() { public void run() { try { TimeUnit.SECONDS.sleep(1); System.out.println("執行完"); } catch (InterruptedException e) { e.printStackTrace(); } } }); } //myThreadPoolExecutor.shutdownNow(); }} |
通過擴展線程池，開發者可以獲取線程池調度的內部細節，對並行程序故障排查很有幫助