dea*_*ock 12 java multithreading threadpool threadpoolexecutor
我在里面有很多任务TheadPoolExecutor.我的界面上有一个停止按钮,可以ThreadPoolExecutor立即终止所有线程.我正在寻找一种方法来做到这一点.(没有shutDown()或shutDownNow()).
谢谢
Pet*_*rey 14
你无法立即安全地杀死线程.您的任务应该尊重中断并在中断时停止.如果使用ThreadPoolExecutor.shutdownNow(),则所有正在运行的任务都将被中断.
唯一的选择是在一个单独的进程中的线程发出一个信号来杀死进程.
将shutdown()只会使ThreadPoolExecutor拒绝所有新submited任务,并从队列中删除(如果ThreadPool是无界队列执行人)的尚未完成的任务.该shutdownNow()会做同样的,也将调用该interrupt()方法Thread.因此,在您的run()方法中,您应该正确处理它:
try {
Thread.sleep(1000);
} catch (InterruptedException ie) {
// Handle the exception, and close resources.
}
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小智 5
老问题了,但我认为您可以扩展ThreadPoolExecutor来捕获beforeExecute()中正在运行的线程引用。当shutdownNow()被调用时,您可以stop()所有正在运行的线程。尽管我强烈建议您在任务中依赖isInterrupted()。
示例代码->
public class KillableThreadPoolExecutor extends ThreadPoolExecutor {
private final Map<Runnable, Thread> executingThreads;
public KillableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, String threadNamePrefix) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, new YoungMemorySafeLinkedBlockingQueue<Runnable>(), ThreadFactories.create(threadNamePrefix));
executingThreads = new HashMap<>(maximumPoolSize);
}
@Override
protected synchronized void beforeExecute(Thread t, Runnable r) {
super.beforeExecute(t, r);
executingThreads.put(r, t);
}
@Override
protected synchronized void afterExecute(Runnable r, Throwable t) {
super.afterExecute(r, t);
if(executingThreads.containsKey(r)) {
executingThreads.remove(r);
}
}
@Override
public synchronized List<Runnable> shutdownNow() {
List<Runnable> runnables = super.shutdownNow();
for(Thread t : executingThreads.values()) {
t.stop();
}
return runnables;
}
}
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