001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.example.client;
018    
019    import org.apache.camel.CamelContext;
020    import org.apache.camel.Endpoint;
021    import org.apache.camel.Exchange;
022    import org.apache.camel.ExchangePattern;
023    import org.apache.camel.Producer;
024    import org.springframework.context.ApplicationContext;
025    import org.springframework.context.support.ClassPathXmlApplicationContext;
026    
027    /**
028     * Client that uses the <a href="http://camel.apache.org/message-endpoint.html">Mesage Endpoint</a>
029     * pattern to easily exchange messages with the Server.
030     * <p/>
031     * Notice this very same API can use for all components in Camel, so if we were using TCP communication instead
032     * of JMS messaging we could just use <code>camel.getEndpoint("mina:tcp://someserver:port")</code>.
033     * <p/>
034     * Requires that the JMS broker is running, as well as CamelServer
035     */
036    public final class CamelClientEndpoint {
037        private CamelClientEndpoint() {
038            //Helper class
039        }
040    
041        // START SNIPPET: e1
042        public static void main(final String[] args) throws Exception {
043            System.out.println("Notice this client requires that the CamelServer is already running!");
044    
045            ApplicationContext context = new ClassPathXmlApplicationContext("camel-client.xml");
046            CamelContext camel = (CamelContext) context.getBean("camel-client");
047    
048            // get the endpoint from the camel context
049            Endpoint endpoint = camel.getEndpoint("jms:queue:numbers");
050    
051            // create the exchange used for the communication
052            // we use the in out pattern for a synchronized exchange where we expect a response
053            Exchange exchange = endpoint.createExchange(ExchangePattern.InOut);
054            // set the input on the in body
055            // must you correct type to match the expected type of an Integer object
056            exchange.getIn().setBody(11);
057    
058            // to send the exchange we need an producer to do it for us
059            Producer producer = endpoint.createProducer();
060            // start the producer so it can operate
061            producer.start();
062    
063            // let the producer process the exchange where it does all the work in this oneline of code
064            System.out.println("Invoking the multiply with 11");
065            producer.process(exchange);
066    
067            // get the response from the out body and cast it to an integer
068            int response = exchange.getOut().getBody(Integer.class);
069            System.out.println("... the result is: " + response);
070    
071            // stop and exit the client
072            producer.stop();
073            System.exit(0);
074        }
075        // END SNIPPET: e1
076    
077    }