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git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@509728 13f79535-47bb-0310-9956-ffa450edef68
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Robert Davies 2007-02-20 20:05:00 +00:00
parent 76c466ddef
commit 32a4c47204
1 changed files with 67 additions and 70 deletions
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137
activemq-core/src/main/java/org/apache/activemq/transport/ResponseCorrelator.java
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@ -1,125 +1,122 @@
/** /**
* *
* Licensed to the Apache Software Foundation (ASF) under one or more * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
* contributor license agreements. See the NOTICE file distributed with * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
* this work for additional information regarding copyright ownership. * to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
* The ASF licenses this file to You under the Apache License, Version 2.0 * License. You may obtain a copy of the License at
* (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 * http://www.apache.org/licenses/LICENSE-2.0
* *
* Unless required by applicable law or agreed to in writing, software * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* distributed under the License is distributed on an "AS IS" BASIS, * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * specific language governing permissions and limitations under the License.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ */
package org.apache.activemq.transport; package org.apache.activemq.transport;
import java.io.IOException; import java.io.IOException;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator; import java.util.Iterator;
import java.util.Map;
import org.apache.activemq.command.Command; import org.apache.activemq.command.Command;
import org.apache.activemq.command.ExceptionResponse; import org.apache.activemq.command.ExceptionResponse;
import org.apache.activemq.command.Response; import org.apache.activemq.command.Response;
import org.apache.activemq.util.IntSequenceGenerator; import org.apache.activemq.util.IntSequenceGenerator;
import org.apache.commons.logging.Log; import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory; import org.apache.commons.logging.LogFactory;
import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentHashMap;
/** /**
* Adds the incrementing sequence number to commands along with performing the corelation of * Adds the incrementing sequence number to commands along with performing the corelation of responses to requests to
* responses to requests to create a blocking request-response semantics. * create a blocking request-response semantics.
* *
* @version $Revision: 1.4 $ * @version $Revision: 1.4 $
*/ */
public class ResponseCorrelator extends TransportFilter { public class ResponseCorrelator extends TransportFilter{
private static final Log log = LogFactory.getLog(ResponseCorrelator.class); private static final Log log=LogFactory.getLog(ResponseCorrelator.class);
private final Map requestMap=new HashMap();
private final ConcurrentHashMap requestMap = new ConcurrentHashMap();
private IntSequenceGenerator sequenceGenerator; private IntSequenceGenerator sequenceGenerator;
private final boolean debug = log.isDebugEnabled(); private final boolean debug=log.isDebugEnabled();
public ResponseCorrelator(Transport next) {
this(next, new IntSequenceGenerator()); public ResponseCorrelator(Transport next){
} this(next,new IntSequenceGenerator());
public ResponseCorrelator(Transport next, IntSequenceGenerator sequenceGenerator) {
super(next);
this.sequenceGenerator = sequenceGenerator;
} }
public void oneway(Object o) throws IOException { public ResponseCorrelator(Transport next,IntSequenceGenerator sequenceGenerator){
Command command = (Command) o; super(next);
this.sequenceGenerator=sequenceGenerator;
}
public void oneway(Object o) throws IOException{
Command command=(Command)o;
command.setCommandId(sequenceGenerator.getNextSequenceId()); command.setCommandId(sequenceGenerator.getNextSequenceId());
command.setResponseRequired(false); command.setResponseRequired(false);
next.oneway(command); next.oneway(command);
} }
public FutureResponse asyncRequest(Object o, ResponseCallback responseCallback) throws IOException { public FutureResponse asyncRequest(Object o,ResponseCallback responseCallback) throws IOException{
Command command = (Command) o; Command command=(Command)o;
command.setCommandId(sequenceGenerator.getNextSequenceId()); command.setCommandId(sequenceGenerator.getNextSequenceId());
command.setResponseRequired(true); command.setResponseRequired(true);
FutureResponse future = new FutureResponse(responseCallback); FutureResponse future=new FutureResponse(responseCallback);
requestMap.put(new Integer(command.getCommandId()), future); synchronized(requestMap){
requestMap.put(new Integer(command.getCommandId()),future);
}
next.oneway(command); next.oneway(command);
return future; return future;
} }
public Object request(Object command) throws IOException { public Object request(Object command) throws IOException{
FutureResponse response = asyncRequest(command, null); FutureResponse response=asyncRequest(command,null);
return response.getResult(); return response.getResult();
} }
public Object request(Object command,int timeout) throws IOException { public Object request(Object command,int timeout) throws IOException{
FutureResponse response = asyncRequest(command, null); FutureResponse response=asyncRequest(command,null);
return response.getResult(timeout); return response.getResult(timeout);
} }
public void onCommand(Object o) { public void onCommand(Object o){
Command command = (Command) o; Command command=(Command)o;
if(command.isResponse()){
if( command.isResponse() ) { Response response=(Response)command;
Response response = (Response) command; FutureResponse future=null;
FutureResponse future = (FutureResponse) requestMap.remove(new Integer(response.getCorrelationId())); synchronized(requestMap){
if( future!=null ) { future=(FutureResponse)requestMap.remove(new Integer(response.getCorrelationId()));
future.set(response);
} else {
if( debug ) log.debug("Received unexpected response for command id: "+response.getCorrelationId());
} }
} else { if(future!=null){
future.set(response);
}else{
if(debug)
log.debug("Received unexpected response for command id: "+response.getCorrelationId());
}
}else{
getTransportListener().onCommand(command); getTransportListener().onCommand(command);
} }
} }
/** /**
* If an async exception occurs, then assume no responses will arrive for any of * If an async exception occurs, then assume no responses will arrive for any of current requests. Lets let them
* current requests. Lets let them know of the problem. * know of the problem.
*/ */
public void onException(IOException error) { public void onException(IOException error){
// Copy and Clear the request Map // Copy and Clear the request Map
ArrayList requests = new ArrayList(requestMap.values()); ArrayList requests=new ArrayList(requestMap.values());
requestMap.clear(); requestMap.clear();
for(Iterator iter=requests.iterator();iter.hasNext();){
for (Iterator iter = requests.iterator(); iter.hasNext();) { FutureResponse fr=(FutureResponse)iter.next();
FutureResponse fr = (FutureResponse) iter.next();
fr.set(new ExceptionResponse(error)); fr.set(new ExceptionResponse(error));
} }
super.onException(error); super.onException(error);
} }
public IntSequenceGenerator getSequenceGenerator() { public IntSequenceGenerator getSequenceGenerator(){
return sequenceGenerator; return sequenceGenerator;
} }
public String toString() { public String toString(){
return next.toString(); return next.toString();
} }
} }