/* * 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(); } }