cluster/src/org/apache/qpid/server/queue/RemoteSubscriptionImpl.java


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/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * Licensed 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.qpid.server.cluster.MemberHandle;
import org.apache.qpid.server.cluster.GroupManager;
import org.apache.qpid.server.cluster.SimpleSendable;
import org.apache.qpid.AMQException;

class RemoteSubscriptionImpl implements Subscription, WeightedSubscriptionManager
{
    private final GroupManager _groupMgr;
    private final MemberHandle _peer;
    private boolean _suspended;
    private int _count;

    RemoteSubscriptionImpl(GroupManager groupMgr, MemberHandle peer)
    {
        _groupMgr = groupMgr;
        _peer = peer;
    }

    synchronized void increment()
    {
        _count++;
    }

    synchronized boolean decrement()
    {
        return --_count <= 0;
    }

    public void send(AMQMessage msg, AMQQueue queue)
    {
        try
        {
            _groupMgr.send(_peer, new SimpleSendable(msg.getPayload()));
        }
        catch (AMQException e)
        {
            //TODO: handle exceptions properly...
            e.printStackTrace();
        }
    }

    public synchronized void setSuspended(boolean suspended)
    {
        _suspended = suspended;
    }

    public synchronized boolean isSuspended()
    {
        return _suspended;
    }

    public synchronized int getWeight()
    {
        return _count;
    }

    public boolean hasActiveSubscribers()
    {
        return getWeight() == 0;
    }

    public Subscription nextSubscriber(AMQMessage msg)
    {
        return this;
    }

    public void queueDeleted(AMQQueue queue)
    {
        if(queue instanceof ClusteredQueue)
        {
            ((ClusteredQueue) queue).removeAllRemoteSubscriber(_peer);
        }
    }
}