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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.queue;
import org.apache.log4j.Logger;
import org.apache.qpid.server.cluster.util.LogMessage;
class ClusteredSubscriptionManager extends SubscriptionSet
{
private static final Logger _logger = Logger.getLogger(ClusteredSubscriptionManager.class);
private final NestedSubscriptionManager _all;
ClusteredSubscriptionManager()
{
this(new NestedSubscriptionManager());
}
private ClusteredSubscriptionManager(NestedSubscriptionManager all)
{
_all = all;
_all.addSubscription(new Parent());
}
NestedSubscriptionManager getAllSubscribers()
{
return _all;
}
public boolean hasActiveSubscribers()
{
return _all.hasActiveSubscribers();
}
public Subscription nextSubscriber(AMQMessage msg)
{
if(ClusteredQueue.isFromBroker(msg))
{
//if message is from another broker, it should only be delivered
//to another client to meet ordering constraints
Subscription s = super.nextSubscriber(msg);
_logger.info(new LogMessage("Returning next *client* subscriber {0}", s));
if(s == null)
{
//TODO: deliver to another broker, but set the redelivered flag on the msg
//(this should be policy based)
//for now just don't deliver it
return null;
}
else
{
return s;
}
}
Subscription s = _all.nextSubscriber(msg);
_logger.info(new LogMessage("Returning next subscriber {0}", s));
return s;
}
private class Parent implements WeightedSubscriptionManager
{
public int getWeight()
{
return ClusteredSubscriptionManager.this.getWeight();
}
public boolean hasActiveSubscribers()
{
return ClusteredSubscriptionManager.super.hasActiveSubscribers();
}
public Subscription nextSubscriber(AMQMessage msg)
{
return ClusteredSubscriptionManager.super.nextSubscriber(msg);
}
}
}
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