[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: Why failoverValve has the ThreadLocal routine

[timfox]

I've just woken up and this is off the top of my head, untried, but how about something like this:


  | lass Valve
  | {
  | private int count;
  | private boolean locked;
  | 
  | public synchronized void enter()
  | {
  |    while (locked)
  |    {
  |       wait();
  |    }
  |    count++;
  | }
  | 
  | public synchronized void exit()
  | {
  |    count--;
  | 
  |    notifyAll();
  | }
  | 
  | public synchronized void lock()
  | {
  |    if (locked) return;
  | 
  |    locked = true;
  | 
  |    do
  |    {
  |       while (count > 0)
  |       {
  |          wait();
  |       }
  |    }
  | }
  | 
  | public synchronized void unlock()
  | {
  |    if (!locked) return;
  | 
  |    locked = false;
  | 
  |    notifyAll();
  | } 
  | }
  | 

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