java - 如何处理java线程

Question

我有一个名为 communicator 的类。此类是从另一个程序接收事件的线程的监听器。此类还有一个方法调用刷新，它向程序发送和操作等待来自监听器的响应。

这两个方法都在同一个类中，但由不同的线程调用。

public void processRefreshEvent(ManagerEvent event){
    //processing event
    //...
    //I'm done
    notify();
}


public synchronized void refresh() throws Exception {
    isRefreshing = true;    
    try {
                    manager.send(new refresh());
    } catch (ManagerException e) {
        isRefreshing = false;
    }

    try {
            wait(5000);
    } catch (InterruptedException e) {
    } finally{
        isRefreshing = false;
    }
}

执行上面的代码时出现以下异常:

java.lang.IllegalMonitorStateException: current thread not owner
        at java.lang.Object.wait(Native Method)
        at Communicator.refresh(Communicator.java:203)
        ...

“等待”另一个线程完成的正确方法是什么。谢谢。

Answer 1

您需要在监视器上同步您的线程。例如(使用当前对象作为监视器):

public void processRefreshEvent(ManagerEvent event){
        //processing event
        //...
        //I'm done
    synchronized(this) {
        notify(); // you are basically notifying any thread who has blocked
                  // on this monitor - in our case, the instance of this object
    }
}


public synchronized void refresh() throws Exception {
        isRefreshing = true;    
        try {
                    manager.send(new refresh());
        } catch (ManagerException e) {
                isRefreshing = false;
        }

        try {
          synchronized(this) {
                wait(5000); // wait will give up the monitor
          }
        } catch (InterruptedException e) {
        } finally{
                isRefreshing = false;
        }
}