examples/camel-example-spring-jms/src/test/java/org/apache/camel/example/SpringJmsClientServerTest.java

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 * 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
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package org.apache.camel.example;

import java.io.File;
import java.io.FileOutputStream;

import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.Producer;
import org.apache.camel.test.AvailablePortFinder;
import org.apache.camel.test.spring.CamelSpringTestSupport;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringJmsClientServerTest extends CamelSpringTestSupport {

    @BeforeClass
    public static void setupFreePort() throws Exception {
        // find a free port number, and write that in the custom.properties file
        // which we will use for the unit tests, to avoid port number in use problems
        int port = AvailablePortFinder.getNextAvailable();
        String bank1 = "tcp.port=" + port;

        File custom = new File("target/custom.properties");
        FileOutputStream fos = new FileOutputStream(custom);
        fos.write(bank1.getBytes());
        fos.close();
    }

    @Override
    protected AbstractApplicationContext createApplicationContext() {
        return new ClassPathXmlApplicationContext("/META-INF/spring/camel-server.xml");
    }
    
    @Test
    public void testCamelClientInvocation() {
        // as opposed to the CamelClientRemoting example we need to define the service URI in this java code
        int response = template.requestBody("jms:queue:numbers", 22, Integer.class);
        assertEquals("Get a wrong response", 66, response);
    }
    
    @Test
    public void testCamelEndpointInvocation() throws Exception {
        // get the endpoint from the camel context
        Endpoint endpoint = context.getEndpoint("jms:queue:numbers");

        // create the exchange used for the communication
        // we use the in out pattern for a synchronized exchange where we expect a response
        Exchange exchange = endpoint.createExchange(ExchangePattern.InOut);
        // set the input on the in body
        // must you correct type to match the expected type of an Integer object
        exchange.getIn().setBody(11);

        // to send the exchange we need an producer to do it for us
        Producer producer = endpoint.createProducer();
        // start the producer so it can operate
        producer.start();

        // let the producer process the exchange where it does all the work in this one line of code
        producer.process(exchange);

        // get the response from the out body and cast it to an integer
        int response = exchange.getOut().getBody(Integer.class);
        
        assertEquals("Get a wrong response.", 33, response);

        // stop the producer after usage
        producer.stop();
    }
    
}