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The ActiveMQ Message Broker and Client implementations
/**
* 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.stomp;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.jms.Destination;
import javax.jms.JMSException;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
import org.apache.activemq.advisory.AdvisorySupport;
import org.apache.activemq.command.*;
/**
* Implements ActiveMQ 4.0 translations
*/
public class LegacyFrameTranslator implements FrameTranslator {
public ActiveMQMessage convertFrame(ProtocolConverter converter, StompFrame command) throws JMSException, ProtocolException {
final Map headers = command.getHeaders();
final ActiveMQMessage msg;
/*
* To reduce the complexity of this method perhaps a Chain of Responsibility
* would be a better implementation
*/
if (headers.containsKey(Stomp.Headers.AMQ_MESSAGE_TYPE)) {
String intendedType = (String)headers.get(Stomp.Headers.AMQ_MESSAGE_TYPE);
if(intendedType.equalsIgnoreCase("text")){
ActiveMQTextMessage text = new ActiveMQTextMessage();
try {
text.setText(new String(command.getContent(), "UTF-8"));
} catch (Throwable e) {
throw new ProtocolException("Text could not bet set: " + e, false, e);
}
msg = text;
} else if(intendedType.equalsIgnoreCase("bytes")) {
ActiveMQBytesMessage byteMessage = new ActiveMQBytesMessage();
byteMessage.writeBytes(command.getContent());
msg = byteMessage;
} else {
throw new ProtocolException("Unsupported message type '"+intendedType+"'",false);
}
}else if (headers.containsKey(Stomp.Headers.CONTENT_LENGTH)) {
headers.remove(Stomp.Headers.CONTENT_LENGTH);
ActiveMQBytesMessage bm = new ActiveMQBytesMessage();
bm.writeBytes(command.getContent());
msg = bm;
} else {
ActiveMQTextMessage text = new ActiveMQTextMessage();
try {
text.setText(new String(command.getContent(), "UTF-8"));
} catch (Throwable e) {
throw new ProtocolException("Text could not bet set: " + e, false, e);
}
msg = text;
}
FrameTranslator.Helper.copyStandardHeadersFromFrameToMessage(converter, command, msg, this);
return msg;
}
public StompFrame convertMessage(ProtocolConverter converter, ActiveMQMessage message) throws IOException, JMSException {
StompFrame command = new StompFrame();
command.setAction(Stomp.Responses.MESSAGE);
Map headers = new HashMap(25);
command.setHeaders(headers);
FrameTranslator.Helper.copyStandardHeadersFromMessageToFrame(converter, message, command, this);
if (message.getDataStructureType() == ActiveMQTextMessage.DATA_STRUCTURE_TYPE) {
ActiveMQTextMessage msg = (ActiveMQTextMessage)message.copy();
command.setContent(msg.getText().getBytes("UTF-8"));
} else if (message.getDataStructureType() == ActiveMQBytesMessage.DATA_STRUCTURE_TYPE) {
ActiveMQBytesMessage msg = (ActiveMQBytesMessage)message.copy();
msg.setReadOnlyBody(true);
byte[] data = new byte[(int)msg.getBodyLength()];
msg.readBytes(data);
headers.put(Stomp.Headers.CONTENT_LENGTH, "" + data.length);
command.setContent(data);
} else if (message.getDataStructureType() == ActiveMQMessage.DATA_STRUCTURE_TYPE &&
AdvisorySupport.ADIVSORY_MESSAGE_TYPE.equals(message.getType())) {
FrameTranslator.Helper.copyStandardHeadersFromMessageToFrame(
converter, message, command, this);
String body = marshallAdvisory(message.getDataStructure());
command.setContent(body.getBytes("UTF-8"));
}
return command;
}
public String convertDestination(ProtocolConverter converter, Destination d) {
if (d == null) {
return null;
}
ActiveMQDestination activeMQDestination = (ActiveMQDestination)d;
String physicalName = activeMQDestination.getPhysicalName();
String rc = converter.getCreatedTempDestinationName(activeMQDestination);
if( rc!=null ) {
return rc;
}
StringBuffer buffer = new StringBuffer();
if (activeMQDestination.isQueue()) {
if (activeMQDestination.isTemporary()) {
buffer.append("/remote-temp-queue/");
} else {
buffer.append("/queue/");
}
} else {
if (activeMQDestination.isTemporary()) {
buffer.append("/remote-temp-topic/");
} else {
buffer.append("/topic/");
}
}
buffer.append(physicalName);
return buffer.toString();
}
public ActiveMQDestination convertDestination(ProtocolConverter converter, String name) throws ProtocolException {
if (name == null) {
return null;
} else if (name.startsWith("/queue/")) {
String qName = name.substring("/queue/".length(), name.length());
return ActiveMQDestination.createDestination(qName, ActiveMQDestination.QUEUE_TYPE);
} else if (name.startsWith("/topic/")) {
String tName = name.substring("/topic/".length(), name.length());
return ActiveMQDestination.createDestination(tName, ActiveMQDestination.TOPIC_TYPE);
} else if (name.startsWith("/remote-temp-queue/")) {
String tName = name.substring("/remote-temp-queue/".length(), name.length());
return ActiveMQDestination.createDestination(tName, ActiveMQDestination.TEMP_QUEUE_TYPE);
} else if (name.startsWith("/remote-temp-topic/")) {
String tName = name.substring("/remote-temp-topic/".length(), name.length());
return ActiveMQDestination.createDestination(tName, ActiveMQDestination.TEMP_TOPIC_TYPE);
} else if (name.startsWith("/temp-queue/")) {
return converter.createTempQueue(name);
} else if (name.startsWith("/temp-topic/")) {
return converter.createTempTopic(name);
} else {
throw new ProtocolException("Illegal destination name: [" + name + "] -- ActiveMQ STOMP destinations "
+ "must begin with one of: /queue/ /topic/ /temp-queue/ /temp-topic/");
}
}
/**
* Return an Advisory message as a JSON formatted string
* @param ds
* @return
*/
protected String marshallAdvisory(final DataStructure ds) {
XStream xstream = new XStream(new JsonHierarchicalStreamDriver());
xstream.setMode(XStream.NO_REFERENCES);
xstream.aliasPackage("", "org.apache.activemq.command");
return xstream.toXML(ds);
}
}