Examples of org.zkoss.lang.PotentialDeadLockException

org.zkoss.lang.PotentialDeadLockException
Denote a potential dead lock might occur. More precisely, it occurs if a transaction is waiting a lock too long.
How it happens:
Transaction A writes bean X and transaction B writes bean Y, and then A tries to read or write bean Y and B tries to read or write bean X.
This exception shall be rare, because CmpManager sorted beans to be updated in a special order. However, it still might happen, because a transaction might trigger multiple syncBeans. @author tomyeh

          break; //then, load it
        }
      } //sync(_richlets)


      if (!lock.waitUntilUnlock(300*1000)) { //5 minute
        final PotentialDeadLockException ex =
          new PotentialDeadLockException(
          "Unable to load richlet "+name+"\nCause: conflict too long.");
        log.warningBriefly(ex); //very rare, possibly a bug
        throw ex;
      }
    } //for (;;)

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        //invalid, so remove it (if not updated by others)
        synchronized (this) {
          if (super.get(src) == ri) super.remove(src);
        }
      } else if (!lock.waitUntilUnlock(300*1000)) { //5 minute
        final PotentialDeadLockException ex =
          new PotentialDeadLockException(
          "Unable to load from "+src+"\nCause: conflict too long.");
        log.warningBriefly(ex); //very rare, possibly a bug
        throw ex;
      }
    } //for (;;)

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   * this lock. In other words, it tried to wait for itself to complete.
   */
  synchronized public boolean waitUntilUnlock(int timeout) {
    if (!_unlocked) {
      if (Thread.currentThread().equals(_locker))
        throw new PotentialDeadLockException("Wait for itself?");
      try {
        this.wait(timeout);
      } catch (InterruptedException ex) {
        throw SystemException.Aide.wrap(ex);
      }

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Related Classes of org.zkoss.lang.PotentialDeadLockException

org.zkoss.util.resource.ResourceCache

org.zkoss.util.WaitLock

org.zkoss.zk.ui.util.Configuration

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