/*
* Copyright 2002-2011 the original author or authors.
*
* Licensed 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.springframework.flex.messaging.jms;
import java.util.Enumeration;
import java.util.Map;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Session;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.jms.support.converter.MessageConversionException;
import org.springframework.jms.support.converter.MessageConverter;
import org.springframework.jms.support.converter.SimpleMessageConverter;
import org.springframework.util.Assert;
import flex.messaging.messages.AsyncMessage;
/**
* An implementation of the {@link MessageConverter} strategy interface that passes Flex Message headers to JMS Message
* properties and vice versa.
* <p>
* This particular converter is only concerned with the passing of those header/property values. It simply decorates a
* target converter to which it delegates for the actual conversion between a JMS Message and a Flex Message
* <em>body</em>. If no target converter is passed to the constructor, then it will create and delegate to a
* {@link SimpleMessageConverter} instance by default.
* </p>
*
* @author Mark Fisher
*/
public class FlexMessageConverter implements MessageConverter {
private static final String HEADER_PREFIX = "spring_flex_";
private static final String FLEX_CLIENT_ID = HEADER_PREFIX + "clientId";
private static final String FLEX_TIME_TO_LIVE = HEADER_PREFIX + "timeToLive";
private final Log logger = LogFactory.getLog(getClass());
private final MessageConverter targetConverter;
public FlexMessageConverter() {
this(null);
}
public FlexMessageConverter(MessageConverter targetConverter) {
this.targetConverter = targetConverter != null ? targetConverter : new SimpleMessageConverter();
}
/**
*
* {@inheritDoc}
*/
public Object fromMessage(Message message) throws JMSException, MessageConversionException {
Object messageBody = this.targetConverter.fromMessage(message);
AsyncMessage flexMessage = new AsyncMessage();
flexMessage.setBody(messageBody);
flexMessage.setMessageId(message.getJMSMessageID());
flexMessage.setClientId(message.getObjectProperty(FLEX_CLIENT_ID));
flexMessage.setTimestamp(message.getJMSTimestamp());
Object timeToLive = message.getObjectProperty(FLEX_TIME_TO_LIVE);
if (timeToLive != null && long.class.isAssignableFrom(timeToLive.getClass())) {
flexMessage.setTimeToLive(Long.parseLong(timeToLive.toString()));
}
Enumeration<?> propertyNames = message.getPropertyNames();
while (propertyNames.hasMoreElements()) {
String name = (String) propertyNames.nextElement();
if (!name.startsWith(HEADER_PREFIX)) {
flexMessage.setHeader(name, message.getObjectProperty(name));
}
}
return flexMessage;
}
/**
*
* {@inheritDoc}
*/
public Message toMessage(Object object, Session session) throws JMSException, MessageConversionException {
Assert.state(object instanceof flex.messaging.messages.Message, "FlexMessageConverter can only handle Flex Messages");
flex.messaging.messages.Message flexMessage = (flex.messaging.messages.Message) object;
Object messageBody = flexMessage.getBody();
Message jmsMessage = this.targetConverter.toMessage(messageBody, session);
jmsMessage.setObjectProperty(FLEX_CLIENT_ID, flexMessage.getClientId());
jmsMessage.setLongProperty(FLEX_TIME_TO_LIVE, flexMessage.getTimeToLive());
Map<String, Object> headers = this.getFlexMessageHeaderMap(flexMessage);
for (String key : headers.keySet()) {
Object value = flexMessage.getHeader(key);
try {
jmsMessage.setObjectProperty(key, value);
} catch (Exception e) {
if (this.logger.isWarnEnabled()) {
this.logger.warn("failed to copy Flex header '" + key + "'", e);
}
}
}
return jmsMessage;
}
@SuppressWarnings("unchecked")
private Map<String, Object> getFlexMessageHeaderMap(flex.messaging.messages.Message flexMessage) {
return flexMessage.getHeaders();
}
}