/**
* 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.camel.component.spring.integration.adapter;
import org.apache.camel.Consumer;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.component.spring.integration.SpringIntegrationBinding;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.integration.ConfigurationException;
import org.springframework.integration.bus.MessageBus;
import org.springframework.integration.bus.MessageBusAware;
import org.springframework.integration.channel.MessageChannel;
import org.springframework.integration.channel.PollableChannel;
import org.springframework.integration.gateway.SimpleMessagingGateway;
import org.springframework.integration.handler.MessageHandler;
import org.springframework.integration.message.Message;
/**
* A CamelContext will be injected into CameSourceAdapter which will
* let Spring Integration channel talk to the CamelContext certain endpoint
*
* @author Willem Jiang
*
* @version $Revision: 688601 $
*/
public class CamelSourceAdapter extends AbstractCamelAdapter implements MessageHandler, InitializingBean, MessageBusAware {
protected final Object lifecycleMonitor = new Object();
private final Log logger = LogFactory.getLog(this.getClass());
private Consumer consumer;
private Endpoint camelEndpoint;
private MessageChannel requestChannel;
private SimpleMessagingGateway messageGateway = new SimpleMessagingGateway();
private volatile boolean initialized;
public void setRequestChannel(MessageChannel channel) {
requestChannel = channel;
messageGateway.setRequestChannel(requestChannel);
}
public MessageChannel getChannel() {
return requestChannel;
}
public void setReplyChannel(PollableChannel channel) {
messageGateway.setReplyChannel(channel);
}
public void setRequestTimeout(long requestTimeout) {
this.messageGateway.setRequestTimeout(requestTimeout);
}
public void setReplyTimeout(long replyTimeout) {
this.messageGateway.setReplyTimeout(replyTimeout);
}
private void incoming(Exchange exchange) {
org.springframework.integration.message.Message request =
SpringIntegrationBinding.createSpringIntegrationMessage(exchange);
org.springframework.integration.message.Message response = handle(request);
if (response != null) {
// TODO How to deal with the fault message
SpringIntegrationBinding.storeToCamelMessage(response, exchange.getOut());
}
}
protected class ConsumerProcessor implements Processor {
public void process(Exchange exchange) {
try {
incoming(exchange);
} catch (Throwable ex) {
ex.printStackTrace();
logger.warn("Failed to process incoming message : " + ex);
//TODO Maybe we should set the exception as the fault message
}
}
}
public final void afterPropertiesSet() throws Exception {
synchronized (this.lifecycleMonitor) {
if (this.initialized) {
return;
}
}
this.initialize();
this.initialized = true;
}
protected void initialize() throws Exception {
// start the service here
camelEndpoint = getCamelContext().getEndpoint(getCamelEndpointUri());
consumer = camelEndpoint.createConsumer(new ConsumerProcessor());
consumer.start();
}
public final Message<?> handle(Message<?> message) {
if (!this.initialized) {
try {
this.afterPropertiesSet();
} catch (Exception e) {
throw new ConfigurationException("unable to initialize " + this.getClass().getName(), e);
}
}
if (!isExpectReply()) {
messageGateway.send(message);
return null;
}
return messageGateway.sendAndReceiveMessage(message);
}
public void setMessageBus(MessageBus bus) {
messageGateway.setMessageBus(bus);
}
}