Java 无法关闭线程池
我想在Java 无法关闭线程池,java,multithreading,sockets,Java,Multithreading,Sockets,我想在countDownLatch.getCount()为零时关闭服务器,但它不是关闭,而是等待接受套接字连接。以下是处理传入TCP请求的服务器代码 public static void start(File configFile, ReplyListener replyListener, CountDownLatch countDownLatch) { try { Server.init(configFile);
countDownLatch.getCount()
为零时关闭服务器,但它不是关闭,而是等待接受套接字连接。以下是处理传入TCP请求的服务器代码
public static void start(File configFile, ReplyListener replyListener, CountDownLatch countDownLatch) {
try {
Server.init(configFile);
while (countDownLatch.getCount() != 0) {
//try {
Server.socket = serverSocket.accept();
Message message = new Message();
message.setSocket(Server.socket);
Server.pool.submit(new ServerTaskCallable(message.receive()).setReplyListener(replyListener));
/*} catch (SocketTimeoutException e){
System.out.println("Finished testing");
}*/
}
Server.socket.close();
serverSocket.close();
Server.pool.shutdownNow();
} catch (IOException e) {
logger.error("Cannot start a server. The server thread will be terminated. Exception: ", e);
System.exit(0);
}
}
这是线程dum:
"pool-1-thread-1@651" prio=5 tid=0xe nid=NA runnable
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(PlainSocketImpl.java:-1)
at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:404)
at java.net.ServerSocket.implAccept(ServerSocket.java:545)
at java.net.ServerSocket.accept(ServerSocket.java:513)
at model.server.Server.start(Server.java:42)
at model.MainTest.lambda$main$3(MainTest.java:30)
at model.MainTest$$Lambda$2.2012232625.run(Unknown Source:-1)
at java.lang.Thread.run(Thread.java:745)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
"pool-3-thread-1@1142" prio=5 tid=0x12 nid=NA waiting
java.lang.Thread.State: WAITING
at sun.misc.Unsafe.park(Unsafe.java:-1)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
如何正确终止服务器线程池?您有两个选项:
服务器套接字上设置超时。这将导致每次超时时,accept()
抛出一个SocketTimeoutException
。您需要捕获循环中的异常,以确保服务器一直在侦听连接:
while(countDownLatch.getCount() != 0) {
try {
socket = serverSocket.accept();
} catch(SocketTimeoutException e) {
//timeout occurred!
}
}
ServerSocket
via。这将抛出一个socketaccept
,终止accept()
调用。可以在循环之外捕获此异常,以便轻松退出“侦听连接”行为您是否使用了
ServerSocket
?它有助于终止线程池,但我希望避免使用timeOut()(当然,如果可行的话)。我只能想到两个选项,第一个选项是超时,如前所述,本质上是每隔一段时间强制代码通过循环。第二个是中断某个主线程发出的接受调用。明白你的意思了吗。但是,我想知道,为什么countdownLatch的解决方案不起作用?您不能通过Thread\interrupt()
中断accept()
调用(因为它不会抛出interruptedeException
,因此无处处理中断),尽管您可以关闭()
来自另一个线程的ServerSocket
,该线程应中断accept