ActiveMQ example source code file (FrameTranslator.java)

This example ActiveMQ source code file (FrameTranslator.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

activemqmessage, activemqmessage, frametranslator, frametranslator, helper, io, ioexception, jmsexception, map, object, protocolexception, stompframe, stompframe, string, string, util

The ActiveMQ FrameTranslator.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 javax.jms.MessageListener;
import javax.jms.MessageProducer;

import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQMessage;
import org.apache.activemq.command.Message;

/**
 * Implementations of this interface are used to map back and forth from Stomp
 * to ActiveMQ. There are several standard mappings which are semantically the
 * same, the inner class, Helper, provides functions to copy those properties
 * from one to the other
 */
public interface FrameTranslator {
    ActiveMQMessage convertFrame(ProtocolConverter converter, StompFrame frame) throws JMSException, ProtocolException;

    StompFrame convertMessage(ProtocolConverter converter, ActiveMQMessage message) throws IOException, JMSException;

    String convertDestination(ProtocolConverter converter, Destination d);

    ActiveMQDestination convertDestination(ProtocolConverter converter, String name) throws ProtocolException;

    /**
     * Helper class which holds commonly needed functions used when implementing
     * FrameTranslators
     */
    static final class Helper {

        private Helper() {
        }

        public static void copyStandardHeadersFromMessageToFrame(ProtocolConverter converter, ActiveMQMessage message, StompFrame command, FrameTranslator ft) throws IOException {
            final Map<String, String> headers = command.getHeaders();
            headers.put(Stomp.Headers.Message.DESTINATION, ft.convertDestination(converter, message.getDestination()));
            headers.put(Stomp.Headers.Message.MESSAGE_ID, message.getJMSMessageID());

            if (message.getJMSCorrelationID() != null) {
                headers.put(Stomp.Headers.Message.CORRELATION_ID, message.getJMSCorrelationID());
            }
            headers.put(Stomp.Headers.Message.EXPIRATION_TIME, "" + message.getJMSExpiration());

            if (message.getJMSRedelivered()) {
                headers.put(Stomp.Headers.Message.REDELIVERED, "true");
            }
            headers.put(Stomp.Headers.Message.PRORITY, "" + message.getJMSPriority());

            if (message.getJMSReplyTo() != null) {
                headers.put(Stomp.Headers.Message.REPLY_TO, ft.convertDestination(converter, message.getJMSReplyTo()));
            }
            headers.put(Stomp.Headers.Message.TIMESTAMP, "" + message.getJMSTimestamp());

            if (message.getJMSType() != null) {
                headers.put(Stomp.Headers.Message.TYPE, message.getJMSType());
            }

            if (message.getUserID() != null) {
                headers.put(Stomp.Headers.Message.USERID, message.getUserID());
            }

            if (message.getOriginalDestination() != null) {
                headers.put(Stomp.Headers.Message.ORIGINAL_DESTINATION, ft.convertDestination(converter, message.getOriginalDestination()));
            }

            // now lets add all the message headers
            final Map<String, Object> properties = message.getProperties();
            if (properties != null) {
                for (Map.Entry<String, Object> prop : properties.entrySet()) {
                    headers.put(prop.getKey(), "" + prop.getValue());
                }
            }
        }

        public static void copyStandardHeadersFromFrameToMessage(ProtocolConverter converter, StompFrame command, ActiveMQMessage msg, FrameTranslator ft) throws ProtocolException, JMSException {
            final Map<String, String> headers = new HashMap(command.getHeaders());
            final String destination = headers.remove(Stomp.Headers.Send.DESTINATION);
            msg.setDestination(ft.convertDestination(converter, destination));

            // the standard JMS headers
            msg.setJMSCorrelationID(headers.remove(Stomp.Headers.Send.CORRELATION_ID));

            Object o = headers.remove(Stomp.Headers.Send.EXPIRATION_TIME);
            if (o != null) {
                msg.setJMSExpiration(Long.parseLong((String)o));
            }

            o = headers.remove(Stomp.Headers.Send.PRIORITY);
            if (o != null) {
                msg.setJMSPriority(Integer.parseInt((String)o));
            } else {
                msg.setJMSPriority(javax.jms.Message.DEFAULT_PRIORITY);
            }

            o = headers.remove(Stomp.Headers.Send.TYPE);
            if (o != null) {
                msg.setJMSType((String)o);
            }

            o = headers.remove(Stomp.Headers.Send.REPLY_TO);
            if (o != null) {
                msg.setJMSReplyTo(ft.convertDestination(converter, (String)o));
            }

            o = headers.remove(Stomp.Headers.Send.PERSISTENT);
            if (o != null) {
                msg.setPersistent("true".equals(o));
            }

            // Stomp specific headers
            headers.remove(Stomp.Headers.RECEIPT_REQUESTED);

            // Since we take the rest of the header and put them in properties which could then
            // be sent back to a STOMP consumer we need to sanitize anything which could be in
            // Stomp.Headers.Message and might get passed through to the consumer
            headers.remove(Stomp.Headers.Message.MESSAGE_ID);
            headers.remove(Stomp.Headers.Message.TIMESTAMP);
            headers.remove(Stomp.Headers.Message.REDELIVERED);
            headers.remove(Stomp.Headers.Message.SUBSCRIPTION);
            headers.remove(Stomp.Headers.Message.USERID);

            // now the general headers
            msg.setProperties(headers);
        }
    }
}