/*
 *
 * 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.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQFrame;
import org.apache.qpid.framing.ExchangeDeclareBody;
import org.apache.qpid.framing.ExchangeDeclareOkBody;
import org.apache.qpid.server.exchange.Exchange;
import org.apache.qpid.server.exchange.ExchangeRegistry;
import org.apache.qpid.server.exchange.ExchangeFactory;
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;
import org.apache.qpid.server.registry.ApplicationRegistry;

public class ExchangeDeclareHandler implements StateAwareMethodListener<ExchangeDeclareBody>
{
    private static final Logger _logger = Logger.getLogger(ExchangeDeclareHandler.class);

    private static final ExchangeDeclareHandler _instance = new ExchangeDeclareHandler();

    public static ExchangeDeclareHandler getInstance()
    {
        return _instance;
    }

    private final ExchangeFactory exchangeFactory;

    private ExchangeDeclareHandler()
    {
        exchangeFactory = ApplicationRegistry.getInstance().getExchangeFactory();
    }

    public void methodReceived(AMQStateManager stateManager, QueueRegistry queueRegistry,
                               ExchangeRegistry exchangeRegistry, AMQProtocolSession protocolSession,
                               AMQMethodEvent<ExchangeDeclareBody> evt) throws AMQException
    {
        final ExchangeDeclareBody body = evt.getMethod();
        if (_logger.isDebugEnabled())
        {
            _logger.debug("Request to declare exchange of type " + body.type + " with name " + body.exchange);
        }
        synchronized(exchangeRegistry)
        {
            Exchange exchange = exchangeRegistry.getExchange(body.exchange);

            if (exchange == null)
            {
                exchange = exchangeFactory.createExchange(body.exchange, body.type, body.durable,
                                                          body.passive, body.ticket);
                exchangeRegistry.registerExchange(exchange);
            }
        }
        if(!body.nowait)
        {
            AMQFrame response = ExchangeDeclareOkBody.createAMQFrame(evt.getChannelId());
            protocolSession.writeFrame(response);
        }
    }
}
