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ActiveMQ example source code file (LegacyFrameTranslator.java)

This example ActiveMQ source code file (LegacyFrameTranslator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemqbytesmessage, activemqbytesmessage, activemqdestination, activemqmessage, activemqtextmessage, activemqtextmessage, io, jmsexception, protocolexception, protocolexception, stompframe, string, string, utf-8, util, xstream

The ActiveMQ LegacyFrameTranslator.java source code

/**
 * 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<String, String> 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);
    }
}

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