cluster/src/org/apache/qpid/server/cluster/handler/QueueNameGenerator.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.cluster.handler;

import org.apache.qpid.AMQException;
import org.apache.qpid.framing.QueueDeclareBody;
import org.apache.qpid.server.exchange.ExchangeRegistry;
import org.apache.qpid.server.protocol.AMQMethodEvent;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.queue.QueueRegistry;
import org.apache.qpid.server.state.AMQStateManager;

/**
 * Generates queue names for queues declared with no name.
 *
 */
class QueueNameGenerator extends ClusterMethodHandler<QueueDeclareBody>
{
    private final LocalQueueDeclareHandler _handler;

    QueueNameGenerator(LocalQueueDeclareHandler handler)
    {
        _handler = handler;
    }

    protected void peer(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<QueueDeclareBody> evt) throws AMQException
    {
    }

    protected void client(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges,
                          AMQProtocolSession session, AMQMethodEvent<QueueDeclareBody> evt)
            throws AMQException
    {
        setName(evt.getMethod());//need to set the name before propagating this method
    }

    protected void setName(QueueDeclareBody body)
    {
        if (body.queue == null)
        {
            body.queue = _handler.createName();
        }
    }
}