/**
* 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.activemq.transport;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import org.apache.activemq.command.Command;
import org.apache.activemq.command.LastPartialCommand;
import org.apache.activemq.command.PartialCommand;
import org.apache.activemq.openwire.OpenWireFormat;
import org.apache.activemq.util.ByteArrayInputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Joins together of partial commands which were split into individual chunks of
* data.
*
* @version $Revision: 564271 $
*/
public class CommandJoiner extends TransportFilter {
private static final Log LOG = LogFactory.getLog(CommandJoiner.class);
private ByteArrayOutputStream out = new ByteArrayOutputStream();
private OpenWireFormat wireFormat;
public CommandJoiner(Transport next, OpenWireFormat wireFormat) {
super(next);
this.wireFormat = wireFormat;
}
public void onCommand(Object o) {
Command command = (Command)o;
byte type = command.getDataStructureType();
if (type == PartialCommand.DATA_STRUCTURE_TYPE || type == LastPartialCommand.DATA_STRUCTURE_TYPE) {
PartialCommand header = (PartialCommand)command;
byte[] partialData = header.getData();
try {
out.write(partialData);
} catch (IOException e) {
getTransportListener().onException(e);
}
if (type == LastPartialCommand.DATA_STRUCTURE_TYPE) {
try {
byte[] fullData = out.toByteArray();
out.reset();
DataInputStream dataIn = new DataInputStream(new ByteArrayInputStream(fullData));
Command completeCommand = (Command)wireFormat.unmarshal(dataIn);
LastPartialCommand lastCommand = (LastPartialCommand)command;
lastCommand.configure(completeCommand);
getTransportListener().onCommand(completeCommand);
} catch (IOException e) {
LOG.warn("Failed to unmarshal partial command: " + command);
getTransportListener().onException(e);
}
}
} else {
getTransportListener().onCommand(command);
}
}
public void stop() throws Exception {
super.stop();
out = null;
}
public String toString() {
return next.toString();
}
}