类之间的Java共享条件引发IllegalMonitorStateException:null
我有这样的结构:类之间的Java共享条件引发IllegalMonitorStateException:null,java,multithreading,concurrency,locking,java.util.concurrent,Java,Multithreading,Concurrency,Locking,Java.util.concurrent,我有这样的结构: 锁包装器-用于存储响应中的锁、条件和对象 public class LockWrapper{ private Lock lock; private Condition myCondition; private MyObject myObject; public LockWrapper(Lock lock, Condition myCondition) { this.lock = lock; this.myCond
锁包装器-用于存储响应中的锁、条件和对象
public class LockWrapper{
private Lock lock;
private Condition myCondition;
private MyObject myObject;
public LockWrapper(Lock lock, Condition myCondition) {
this.lock = lock;
this.myCondition = myCondition;
}
public Condition getMyCondition() {
return myCondition;
}
public MyObject getMyObject() {
return myObject;
}
public void setObject(MyObject myObject) {
this.myObject = myObject;
}
public Lock getLock() {
return lock;
}
}
任务-推送到线程池中执行。它向服务器发起请求,然后等待服务器响应
public class MyTask implements Runnable{
private Lock lock = new ReentrantLock();
private Condition myCondition = lock.newCondition();
private MyWebSocketAPI api;
public MyTask(MyWebSocketAPI api) {
this.api = api;
}
@Override
public void run() {
lock.lock();
try {
// long randomLong = generateRandomLong();
api.sendRequest(randomLong, new LockWrapper(lock, myCondition));
myCondition.await();
//do something after we got a response
} finally{
lock.unlock();
}
}
}
WebSocket-获取请求并将响应通知给任务
public abstract class MyWebSocketAPI extends WebSocketClient {
//...
private Map<Long, LockWrapper> lockWrappers = new ConcurrentHashMap<>();
public void sendRequest(Long id, LockWrapper lockWrapper){
this.lockWrappers.put(id, lockWrapper);
//processRequest
}
@Override
public void onMessage(String message) {
LockWrapper lockWrapper = lockWrappers.get(message.get(0).getAsLong());
lockWrapper.getLock().lock();
try{
lockWrapper.setMyObject(new MyObject(message));
this.lockWrappers.put(message.get(0).getAsLong(), lockWrapper);
lockWrapper.getMyCondition().signalAll();
} finally {
lockWrapper.getLock().unlock();
}
}
//...
}
当我试图通知任务我们得到了它们的对象时,为什么我的条件会引发此异常?我是在什么地方出错了还是Java不允许共享条件?这是我在
任务中的错误。问题是我在方法运行时创建了全局和局部的锁和条件。锁和条件具有相同的名称。在某些情况下,我使用的是lock
,在某些情况下使用的是this.lock
(但它是两个不同的锁)。结果,在message的方法中,我的条件和锁没有连接在一起。
删除重复项后,一切正常。@khelwood抱歉,编辑了代码。是的,它是锁包装器。在发出信号之前,你需要保持myCondition的锁。已同步(myCondition)。。。signalall()@JJF抱歉,可能我不理解并发中的某些内容。你能再解释一下吗?我想这两种情况我都已经掌握了。如何正确地获取锁?一个可能的选择是在某个地方创建LockWrapper
,使用“错误”参数:传递的锁不拥有的条件。您可以将ctor更改为LockWrapper(Lock Lock)
,删除条件
arg,并在LockWrapper
中创建该条件。当消息
是字符串时,如何执行消息.get(0).getAsLong()
?张贴
java.lang.IllegalMonitorStateException: null
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.signalAll(AbstractQueuedSynchronizer.java:1954)