org.jgroups.protocols
Class SCOPE.QueueThread

java.lang.Object
  org.jgroups.protocols.SCOPE.QueueThread

All Implemented Interfaces:

java.lang.Runnable

Enclosing class:

SCOPE

protected class SCOPE.QueueThread
extends java.lang.Object
implements java.lang.Runnable

Field Summary

protected boolean	first
protected SCOPE.MessageQueue	queue

Constructor Summary

SCOPE.QueueThread(SCOPE.MessageQueue queue)

Method Summary

void	run() Try to remove as many messages as possible from the queue and pass them up.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

queue

protected final SCOPE.MessageQueue queue

first

protected boolean first

Constructor Detail

SCOPE.QueueThread

public SCOPE.QueueThread(SCOPE.MessageQueue queue)

Method Detail

run

public void run()

Try to remove as many messages as possible from the queue and pass them up. The outer and inner loop and the size() check at the end prevent the following scenario:

 - Threads T1 and T2
 - T1 has the CAS
 - T1: remove() == null
 - T2: add()
 - T2: attempt to set the CAS: false, return
 - T1: set the CAS to false, return
 ==> Result: we have a message in the queue that nobody takes care of !
 

Specified by:

run in interface java.lang.Runnable