如何在Java中关闭WebSocketContainer/WebSocketClient/Jetty客户端?
我正在尝试使用Jetty的WebSocket客户端,但应用程序会卡在那里,无法退出。没有什么特别的如何在Java中关闭WebSocketContainer/WebSocketClient/Jetty客户端?,java,jetty,java-websocket,Java,Jetty,Java Websocket,我正在尝试使用Jetty的WebSocket客户端,但应用程序会卡在那里,无法退出。没有什么特别的 public class TestEndPoint extends Endpoint { private Session sess; public TestEndPoint(URI endpoint) throws Exception { WebSocketContainer container = ContainerProvider.getWebSocketC
public class TestEndPoint extends Endpoint {
private Session sess;
public TestEndPoint(URI endpoint) throws Exception {
WebSocketContainer container = ContainerProvider.getWebSocketContainer();
container.connectToServer(this, endpoint);
}
public void close() {
try {
this.sess.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
...
}
我将它连接到我的PHP Ratchet WS,没有什么特殊的,没有特殊的逻辑,我只是在客户端连接时打印出open
,在客户端断开连接时打印出close
然后我像这样运行它:
public static void main(String[] args) {
try {
TestEndPoint test = new TestEndPoint(new URI("ws://localhost:8080/test"));
Thread.sleep(5000);
test.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
我可以看到我的WS会打印“close”,但是Java应用程序永远不会退出。因此,我进行了一次线程转储,发现jetty
东西被卡在了一些QueuedThreadPool
中
一些线程转储:
"WebSocketContainer@1735934726-15" #15 daemon prio=5 os_prio=0 tid=0x0000000016cdf000 nid=0x1c5c runnable [0x000000001763e000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.java:296)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelectorImpl.java:278)
at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:159)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000000ebf678c8> (a sun.nio.ch.Util$3)
- locked <0x00000000ebf68128> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000ebf67d40> (a sun.nio.ch.WindowsSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.select(ManagedSelector.java:346)
at org.eclipse.jetty.io.ManagedSelector$SelectorProducer.produce(ManagedSelector.java:299)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:179)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:243)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:679)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:597)
at java.lang.Thread.run(Thread.java:748)
"WebSocketContainer@1735934726-14" #14 daemon prio=5 os_prio=0 tid=0x0000000016cc7000 nid=0xfb4 waiting on condition [0x000000001753f000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000000ebde1df8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
at org.eclipse.jetty.util.BlockingArrayQueue.poll(BlockingArrayQueue.java:392)
at org.eclipse.jetty.util.thread.QueuedThreadPool.idleJobPoll(QueuedThreadPool.java:571)
at org.eclipse.jetty.util.thread.QueuedThreadPool.access$800(QueuedThreadPool.java:50)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:634)
at java.lang.Thread.run(Thread.java:748)
关闭web套接字或客户端的正确方法是什么?在大量搜索和查看示例代码后,您似乎需要手动
停止WebSocketContainer
,方法是将其强制转换到org.eclipse.jetty.util.component.LifeCycle
要停止Jetty的WebSocket客户端,您需要通过会话
或WebSocket容器
本身执行以下操作。因此,在我的close
函数中:
try {
Session sess = getSession();
WebSocketContainer container = sess.getContainer();
// Need to cast the container to Jetty's LifeCycle
if(container != null && container instanceof LifeCycle) {
Logger.debug("Stopping Jetty's WebSocket Client");
((LifeCycle) container).stop();
}
sess.close();
} catch (Exception e) {
Logger.error(e);
}
这上面没有文档,Jetty的网站上也没有文档()这很有帮助。这可以防止LocalEndpoint对象和守护进程线程泄漏。这在两年后帮助了某人!!:)
try {
Session sess = getSession();
WebSocketContainer container = sess.getContainer();
// Need to cast the container to Jetty's LifeCycle
if(container != null && container instanceof LifeCycle) {
Logger.debug("Stopping Jetty's WebSocket Client");
((LifeCycle) container).stop();
}
sess.close();
} catch (Exception e) {
Logger.error(e);
}