package org.jacorb.notification.queue;
/*
* JacORB - a free Java ORB
*
* Copyright (C) 1999-2014 Gerald Brose / The JacORB Team.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
import org.jacorb.notification.interfaces.Message;
/**
* @author Alphonse Bendt
*/
public interface EventQueueOverflowStrategy
{
Message removeElementFromQueue( AbstractBoundedEventQueue queue );
String getDiscardPolicyName();
EventQueueOverflowStrategy FIFO =
new EventQueueOverflowStrategy()
{
public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
{
return queue.getOldestElement();
}
public String getDiscardPolicyName()
{
return "FifoOrder";
}
};
EventQueueOverflowStrategy LIFO =
new EventQueueOverflowStrategy()
{
public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
{
return queue.getYoungestElement();
}
public String getDiscardPolicyName()
{
return "LifoOrder";
}
};
EventQueueOverflowStrategy LEAST_PRIORITY =
new EventQueueOverflowStrategy()
{
public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
{
return queue.getLeastPriority();
}
public String getDiscardPolicyName()
{
return "PriorityOrder";
}
};
EventQueueOverflowStrategy EARLIEST_TIMEOUT =
new EventQueueOverflowStrategy()
{
public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
{
return queue.getEarliestTimeout();
}
public String getDiscardPolicyName()
{
return "TimeoutOrder";
}
};
}