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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.execution;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.log4j.Logger;
import org.apache.qpid.framing.AMQFrame;
import org.apache.qpid.framing.AMQRequestBody;
import org.apache.qpid.framing.AMQResponseBody;
import org.apache.qpid.framing.RequestResponseMappingException;
import org.apache.qpid.nclient.amqp.event.AMQPMethodEvent;
public class RequestManager
{
private static final Logger logger = Logger.getLogger(RequestManager.class);
private int channel;
/**
* Used for logging and debugging only - allows the context of this instance
* to be known.
*/
private boolean serverFlag;
private long connectionId;
/**
* Request and response frames must have a requestID and responseID which
* indepenedently increment from 0 on a per-channel basis. These are the
* counters, and contain the value of the next (not yet used) frame.
*/
private long requestIdCount;
/**
* These keep track of the last requestId and responseId to be received.
*/
private long lastProcessedResponseId;
private ConcurrentHashMap<Long, CorrelationID> requestSentMap;
public RequestManager(long connectionId, int channel, boolean serverFlag)
{
this.channel = channel;
this.serverFlag = serverFlag;
this.connectionId = connectionId;
requestIdCount = 1L;
lastProcessedResponseId = 0L;
requestSentMap = new ConcurrentHashMap<Long, CorrelationID>();
}
// *** Functions to originate a request ***
public AMQFrame sendRequest(AMQPMethodEvent evt)
{
long requestId = getNextRequestId(); // Get new request ID
AMQFrame requestFrame = AMQRequestBody.createAMQFrame(channel, requestId,
lastProcessedResponseId, evt.getMethod());
if (logger.isDebugEnabled())
{
logger.debug((serverFlag ? "SRV[" : "CLI[") + connectionId + "," + channel +
"] TX REQ: Req[" + requestId + " " + lastProcessedResponseId + "]; " + evt.getMethod());
}
requestSentMap.put(requestId, new CorrelationID(evt.getCorrelationId(), evt.getLocalCorrelationId()));
return requestFrame;
}
public List<AMQPMethodEvent> responseReceived(AMQResponseBody responseBody)
throws Exception
{
long requestIdStart = responseBody.getRequestId();
long requestIdStop = requestIdStart + responseBody.getBatchOffset();
if (logger.isDebugEnabled())
{
logger.debug((serverFlag ? "SRV[" : "CLI[") + connectionId + "," + channel + "] RX RES: " +
responseBody + "; " + responseBody.getMethodPayload());
}
List<AMQPMethodEvent> events = new ArrayList<AMQPMethodEvent>();
for (long requestId = requestIdStart; requestId <= requestIdStop; requestId++)
{
if (requestSentMap.get(requestId) == null)
{
throw new RequestResponseMappingException(requestId,
"Failed to locate requestId " + requestId + " in requestSentMap.");
}
CorrelationID correlationID = requestSentMap.get(requestId);
AMQPMethodEvent methodEvent = new AMQPMethodEvent(channel, responseBody.getMethodPayload(),
correlationID.getSystemCorrelationID(),correlationID.getLocalCorrelationID());
events.add(methodEvent);
requestSentMap.remove(requestId);
}
lastProcessedResponseId = responseBody.getResponseId();
return events;
}
// *** Management functions ***
public int requestsMapSize()
{
return requestSentMap.size();
}
// *** Private helper functions ***
private long getNextRequestId()
{
return requestIdCount++;
}
private class CorrelationID
{
// Use for the request/response stuff
private long _systemCorrelationID;
// used internally to track callbacks
private long _localCorrelationID;
CorrelationID(long systemCorrelationID,long localCorrelationID)
{
_localCorrelationID = localCorrelationID;
_systemCorrelationID = systemCorrelationID;
}
public long getLocalCorrelationID()
{
return _localCorrelationID;
}
public void setLocalCorrelationID(long correlationID)
{
_localCorrelationID = correlationID;
}
public long getSystemCorrelationID()
{
return _systemCorrelationID;
}
public void setSystemCorrelationID(long correlationID)
{
_systemCorrelationID = correlationID;
}
}
}
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