线程结束侦听器。JAVA
Java中是否有侦听器来处理某些线程已结束的情况? 大概是这样的:线程结束侦听器。JAVA,java,multithreading,actionlistener,Java,Multithreading,Actionlistener,Java中是否有侦听器来处理某些线程已结束的情况? 大概是这样的: Future<String> test = workerPool.submit(new TestCalalble()); test.addActionListener(new ActionListener() { public void actionEnd(Ac
Future<String> test = workerPool.submit(new TestCalalble());
test.addActionListener(new ActionListener()
{
public void actionEnd(ActionEvent e)
{
txt1.setText("Button1 clicked");
}
});
Future test=workerPool.submit(newtestcalalble());
test.addActionListener(新ActionListener()
{
公共无效actionEnd(ActionEvent e)
{
txt1.setText(“点击按钮1”);
}
});
我知道,这是不可能的处理像这样,但我想得到通知时,一些线程结束
通常我使用这个计时器类来检查每个未来的状态。但这不是一个好办法。
谢谢有你可以用的
CompletionService<Result> ecs
= new ExecutorCompletionService<Result>(e);
ecs.submit(new TestCallable());
if (ecs.take().get() != null) {
// on finish
}
就我个人而言,我更喜欢番石榴汁。不。这样的听众并不存在。 但你有两个解决方案
run()
方法的末尾完成Callable
接口返回类型为Future
的结果。您可以询问Future状态是什么,并使用blocked方法get()
检索结果Thread t = ...
t.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler(){
@Override
public void uncaughtException(Thread t, Throwable e) {
t.getThreadGroup().uncaughtException(t, e);//this is the default behaviour
}
protected void finalize() throws Throwable{
//cool, we go notified
//handle the notification, but be worried, it's the finalizer thread w/ max priority
}
});
通过幻影可以更好地达到效果
希望你有一个小小的微笑:)
旁注:您要求的不是线程结束,而是任务完成事件,最好是重写
decoriteTask
或afterExecute
,您可以实现观察者模式来报告完成情况
public interface IRunComplete {
public void reportCompletion(String message);
}
让线程调用者实现这个接口
在run()方法中,最后调用这个方法。现在你知道这条线什么时候结束了
试试看。实际上,我正在使用它,它工作得很好。无需添加大量额外代码,您可以自己创建一个快速侦听器线程,如下所示:
//worker thread for doings
Thread worker = new Thread(new Runnable(){
public void run(){/*work thread stuff here*/}
});
worker.start();
//observer thread for notifications
new Thread(new Runnable(){
public void run(){
try{worker.join();}
catch(Exception e){;}
finally{ /*worker is dead, do notifications.*/}
}).start();
使用以下示例:
public class Main {
public static void main(String[] args) {
CompletionListener completedListener = count -> System.out.println("Final Count Value: " + count);
HeavyWorkRunnable job = new HeavyWorkRunnable(completedListener);
Thread otherThread = new Thread(job);
otherThread.start();
}
static class HeavyWorkRunnable implements Runnable {
CompletionListener completionListener;
public HeavyWorkRunnable(CompletionListener completionListener) {
this.completionListener = completionListener;
}
@Override
public void run() {
int count = 0;
for (int i = 0; i < 10; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Clock Tick #"+i);
count += 1;
}
if (completionListener != null) {
completionListener.onCompleted(count);
}
}
}
@FunctionalInterface
interface CompletionListener {
void onCompleted(int count);
}
}
公共类主{
公共静态void main(字符串[]args){
CompletionListener completedListener=count->System.out.println(“最终计数值:”+count);
HeavyWorkRunnable作业=新的HeavyWorkRunnable(completedListener);
线程otherThread=新线程(作业);
otherThread.start();
}
静态类HeavyWorkRunnable实现Runnable{
CompletionListener CompletionListener;
公共重量级Runnable(CompletionListener CompletionListener){
this.completionListener=completionListener;
}
@凌驾
公开募捐{
整数计数=0;
对于(int i=0;i<10;i++){
试一试{
睡眠(1000);
}捕捉(中断异常e){
e、 printStackTrace();
}
System.out.println(“时钟滴答声”#“+i);
计数+=1;
}
if(completionListener!=null){
completionListener.onCompleted(计数);
}
}
}
@功能接口
接口完成侦听器{
未完成的无效(整数计数);
}
}
我还可以从ThreadPoolExecutor类重写afterExecute()方法。很高兴知道。我没有用番石榴,但似乎我应该用。。。怎么说呢。你应该。真的。:)“take()-检索并删除表示下一个已完成任务的未来,如果还没有任务,则等待。@”但我希望异步工作,因此它不适合Guava的+1。是的,你绝对应该使用它。Great tools.makeListenable()现在已被弃用甚至删除:“希望使用SettableFuture、MoreExecutors.listeningDecorator(java.util.concurrent.ExecutorService)创建ListenableFuture实例”,ListenableFutureTask,AbstractFuture和其他实用程序,而不是创建普通的将来实例,以便在事后升级到ListenableFuture。如果这不可能,makeListenable的功能现在可以作为JdkFutureAdapters.listenInPoolThread(java.util.concurrent.Future)使用。“我试图如实回答这个问题:“Java中有没有监听器可以处理某些线程已经结束的问题?”而不必进入j.u.c.或Guava或其他构建在核心语言之上的任何东西。
public class Main {
public static void main(String[] args) {
CompletionListener completedListener = count -> System.out.println("Final Count Value: " + count);
HeavyWorkRunnable job = new HeavyWorkRunnable(completedListener);
Thread otherThread = new Thread(job);
otherThread.start();
}
static class HeavyWorkRunnable implements Runnable {
CompletionListener completionListener;
public HeavyWorkRunnable(CompletionListener completionListener) {
this.completionListener = completionListener;
}
@Override
public void run() {
int count = 0;
for (int i = 0; i < 10; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Clock Tick #"+i);
count += 1;
}
if (completionListener != null) {
completionListener.onCompleted(count);
}
}
}
@FunctionalInterface
interface CompletionListener {
void onCompleted(int count);
}
}