标签:tac style down time bsp last ++ ast dea
给线程池增加拒绝策略和停止方法
package com.dwz.concurrency.chapter13; import java.util.ArrayList; import java.util.LinkedList; import java.util.List; public class SimpleThreadPool3 { private final int size; private final int queueSize; private final static int DEFAULT_SIZE = 10; private final static int DEFAULT_TASK_QUEUE_SIZE = 2000; private static volatile int seq = 0; private final static String THREAD_PREFIX = "SIMPLE_THREAD_POOL-"; private final static ThreadGroup GROUP = new ThreadGroup("Pool_Group"); private final static LinkedList<Runnable> TASK_QUEUE = new LinkedList<>(); private final static List<WorkerTask> THREAD_QUEUE = new ArrayList<>(); private final DiscardPolicy discardPolicy; private final static DiscardPolicy DEFAULT_DISCARD_POLICY = ()->{ throw new DiscardException("Discard this task."); }; private volatile boolean destroy = false; public SimpleThreadPool3() { this(DEFAULT_SIZE, DEFAULT_TASK_QUEUE_SIZE, DEFAULT_DISCARD_POLICY); } public SimpleThreadPool3(int size, int queueSize, DiscardPolicy discardPolicy) { this.size = size; this.queueSize = queueSize; this.discardPolicy = discardPolicy; init(); } private void init() { for (int i = 0; i < this.size; i++) { createWorkTask(); } } public void submit(Runnable runnable) { if(destroy) { throw new IllegalStateException("The thread pool already destroy and not allow submit task."); } synchronized (TASK_QUEUE) { if(TASK_QUEUE.size() >= this.queueSize) { discardPolicy.discard(); } TASK_QUEUE.addLast(runnable); TASK_QUEUE.notifyAll(); } } private void createWorkTask() { WorkerTask task = new WorkerTask(GROUP, THREAD_PREFIX + (seq++)); task.start(); THREAD_QUEUE.add(task); } public void shutdown() throws InterruptedException { while (!TASK_QUEUE.isEmpty()) { Thread.sleep(50); } int initVal = THREAD_QUEUE.size(); while (initVal > 0) { for(WorkerTask task : THREAD_QUEUE) { if(task.getTaskState() == TaskState.BLOCKED) { task.interrupt(); task.close(); initVal--; } else { Thread.sleep(10); } } } this.destroy = true; System.out.println("The thread pool disposed."); } public int getSize() { return size; } public int getQueueSize() { return queueSize; } public boolean destroy() { return destroy; } private enum TaskState { FREE, RUNNING, BLOCKED, DEAD } public static class DiscardException extends RuntimeException { public DiscardException(String message) { super(message); } } public interface DiscardPolicy{ void discard() throws DiscardException; } private static class WorkerTask extends Thread { private volatile TaskState taskState = TaskState.FREE; public WorkerTask(ThreadGroup group, String name) { super(group, name); } public TaskState getTaskState() { return this.taskState; } @Override public void run() { OUTER: while (this.taskState != TaskState.DEAD) { Runnable runnable = null; synchronized (TASK_QUEUE) { while (TASK_QUEUE.isEmpty()) { try { this.taskState = TaskState.BLOCKED; TASK_QUEUE.wait(); } catch (InterruptedException e) { e.printStackTrace(); // 线程被打断回到OUTER位置 break OUTER; } } runnable = TASK_QUEUE.removeFirst(); } if (runnable != null) { System.out.println("runnable into..."); this.taskState = TaskState.RUNNING; runnable.run(); this.taskState = TaskState.FREE; } } } public void close() { this.taskState = TaskState.DEAD; } } public static void main(String[] args) throws InterruptedException { SimpleThreadPool3 threadPool = new SimpleThreadPool3(); // IntStream.range(0, 40).forEach(i -> { // threadPool.submit(() -> { // System.out.println("The runnable " + i + " be serviced by " + Thread.currentThread() + " start."); // try { // Thread.sleep(1000); // } catch (InterruptedException e) { // e.printStackTrace(); // } // System.out.println("The runnable " + i + " be serviced by " + Thread.currentThread() + " finished."); // }); // }); for(int i = 0; i < 40; i++) { threadPool.submit(() -> { System.out.println("The runnable be serviced by " + Thread.currentThread() + " start."); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("The runnable be serviced by " + Thread.currentThread() + " finished."); }); } Thread.sleep(10_000); threadPool.shutdown(); threadPool.submit(()->{System.out.println("=======================");}); } }
SimpleThreadPool给线程池增加拒绝策略和停止方法
标签:tac style down time bsp last ++ ast dea
原文地址:https://www.cnblogs.com/zheaven/p/12090464.html