我有2个功能。第一个discoverHosts()向其他计算机发送请求消息。在此之后,它将通过await命令进入睡眠状态。当他接收到响应时,单独的威胁将调用handleMessage()函数。在处理响应之后,他使用notifyAll()让discoderHosts()知道他必须检查是否收到所有响应。为什么不等待线程激活signalAll?
DiscoverHosts()会在他调用该函数时等待。但是,当单独的威胁调用handleMessage()时,当handleMessage调用signalAll()时,discoverHosts()不会唤醒。我调试debuggig,如果signalAll()被调用,并且是这种情况。我的项目中的其他地方几乎有相同的代码,它可以工作。
你们中的任何人都知道我忽略了什么?
private final Lock lock = new ReentrantLock();
private final Condition allReceived = lock.newCondition();
private void discoverHosts() throws Exception {
lock.lock();
externalNodes = new HashMap<String, NodeAddress>();
Message msg = new Message(null, "REQUEST_IP");
logger.debug("Broadcasting ip request, waiting responses");
channel.send(msg);
// TODO:Write a time-out
while (channel.getView().size() - 1 != externalNodes.keySet().size()) {
logger.debug("Channel: " + (channel.getView().size() - 1));
logger.debug("Responses: "+ externalNodes.keySet().size());
allReceived.await();
}
logger.debug("All answers received");
lock.unlock();
}
protected void handleMessage(Message msg) {
lock.lock();
if (!((String) msg.getObject()).matches("IP_RESPONSE:[0-9.]*"))
return;
logger.debug("Received answer from " + msg.getObject());
String ip = ((String) msg.getObject()).replaceAll("IP_RESPONSE:", "");
// externalHostIps.add(ip);
NodeAddress currentAddress = new NodeAddress(ip, msg.getSrc());
externalNodes.put(ip, currentAddress);
logger.debug("Signalling all threads");
allReceived.signalAll();
lock.unlock();
logger.debug("Unlocked");
}
记录仪输出:
4372 [main] DEBUG [email protected] - Broadcasting ip request, waiting responses
4372 [main] DEBUG [email protected] - Channel: 1
4372 [main] DEBUG [email protected] - Responses: 0
4394 [Incoming-1,webhackarena,leendert-K53SV-53745] DEBUG [email protected] - Received answer from IP_RESPONSE:192.168.1.106
4396 [Incoming-1,webhackarena,leendert-K53SV-53745] DEBUG [email protected] - Signalling all threads
4397 [Incoming-1,webhackarena,leendert-K53SV-53745] DEBUG [email protected] - Unlocked
' “字符串” +新的整数(N)的ToString()'是一样的' “串” + N' – 2013-04-11 16:51:45
@PeterLawrey不知道,完全解决了锁定问题。哈。 – 2013-04-11 16:53:15
你的日志输出是什么?无论如何,你应该在try/finally Blocks中包装'lock()'。 – 2013-04-11 16:53:39