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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.nclient.amqp;
import java.security.SecureRandom;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.qpid.framing.AMQMethodBody;
import org.apache.qpid.nclient.amqp.event.AMQPMethodEvent;
import org.apache.qpid.nclient.core.AMQPException;
import org.apache.qpid.nclient.core.QpidConstants;
public abstract class AMQPCallBackSupport
{
private SecureRandom _localCorrelationIdGenerator = new SecureRandom();
protected ConcurrentHashMap<Long,AMQPCallBack> _cbMap = new ConcurrentHashMap<Long,AMQPCallBack>();
//the channelId assigned for this instance
protected int _channelId;
public AMQPCallBackSupport(int channelId)
{
_channelId = channelId;
}
private long getNextCorrelationId()
{
return _localCorrelationIdGenerator.nextLong();
}
// For methods that still use nowait, hopefully they will remove nowait
protected AMQPMethodEvent handleNoWait(boolean noWait,AMQMethodBody methodBody,AMQPCallBack cb)
{
if(noWait)
{
AMQPMethodEvent msg = new AMQPMethodEvent(_channelId,methodBody,QpidConstants.EMPTY_CORRELATION_ID);
return msg;
}
else
{
// u only need to register if u are expecting a response
long localCorrelationId = getNextCorrelationId();
AMQPMethodEvent msg = new AMQPMethodEvent(_channelId,methodBody,QpidConstants.EMPTY_CORRELATION_ID,localCorrelationId);
_cbMap.put(localCorrelationId, cb);
return msg;
}
}
protected AMQPMethodEvent handleAsynchronousCall(AMQMethodBody methodBody,AMQPCallBack cb)
{
long localCorrelationId = getNextCorrelationId();
AMQPMethodEvent msg = new AMQPMethodEvent(_channelId,methodBody,QpidConstants.EMPTY_CORRELATION_ID,localCorrelationId);
_cbMap.put(localCorrelationId, cb);
return msg;
}
protected void invokeCallBack(long localCorrelationId, AMQMethodBody methodBody)throws AMQPException
{
if(_cbMap.containsKey(localCorrelationId))
{
AMQPCallBack cb = (AMQPCallBack)_cbMap.get(localCorrelationId);
if(cb == null)
{
throw new AMQPException("Unable to find the callback object responsible for handling " + methodBody);
}
else
{
cb.setIsComplete(true);
cb.brokerResponded(methodBody);
}
_cbMap.remove(localCorrelationId);
}
else
{
//ignore, as this event is for another class instance
}
}
}
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