/*
 *
 * 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.handler;

import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQFrame;
import org.apache.qpid.framing.ExchangeDeleteBody;
import org.apache.qpid.framing.ExchangeDeleteOkBody;
import org.apache.qpid.server.exchange.ExchangeInUseException;
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;
import org.apache.qpid.server.state.StateAwareMethodListener;

public class ExchangeDeleteHandler implements StateAwareMethodListener<ExchangeDeleteBody>
{
    private static final ExchangeDeleteHandler _instance = new ExchangeDeleteHandler();

    public static ExchangeDeleteHandler getInstance()
    {
        return _instance;
    }

    private ExchangeDeleteHandler()
    {
    }

    public void methodReceived(AMQStateManager stateManager, QueueRegistry queueRegistry,
                               ExchangeRegistry exchangeRegistry, AMQProtocolSession protocolSession,
                               AMQMethodEvent<ExchangeDeleteBody> evt) throws AMQException
    {
        ExchangeDeleteBody body = evt.getMethod();
        try
        {
            exchangeRegistry.unregisterExchange(body.exchange, body.ifUnused);
            AMQFrame response = ExchangeDeleteOkBody.createAMQFrame(evt.getChannelId());
            protocolSession.writeFrame(response);
        }
        catch (ExchangeInUseException e)
        {
            // TODO: sort out consistent channel close mechanism that does all clean up etc.
        }

    }
}
