Define a RabbitMQ broker endpoint in Camel is possible with the Bluelock camel-spring-amqp (https://github.com/Bluelock/camel-spring-amqp) library. It’s an Apache Camel component that allows to natively communicate with a RabbitMQ broker and it’s implemented using Spring’s AMQP.
For first, with Eclipse IDE create a new Maven Project with Artifact ID camel-arthetype-spring. This allows using Spring DSL to configure Camel route and execute the run:camel goal of Camel Mavel Pluing (Camel Maven Plugin) in a forked JVM from Maven.
To resolve the dependencies, these entries are mandatory:
<dependency> <groupId>com.bluelock</groupId> <artifactId>camel-spring-amqp</artifactId> <version>1.2</version> </dependency> <!-- Camel dependencies --> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-test</artifactId> <version>${org.camel.version}</version> </dependency> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-spring</artifactId> <version>${org.camel.version}</version> <exclusions> <exclusion> <artifactId>spring-tx</artifactId> <groupId>org.springframework</groupId> </exclusion> <exclusion> <artifactId>spring-context</artifactId> <groupId>org.springframework</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-xstream</artifactId> <version>${org.camel.version}</version> </dependency> |
At this point edit the camel-context.xml available on src/main/resource/META-INF/spring folder:
<?xml version="1.0" encoding="UTF-8"?> <!-- Configures the Camel Context--> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:camel="http://camel.apache.org/schema/spring" xmlns:rabbit="http://www.springframework.org/schema/rabbit" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-1.0.xsd"> <camelContext xmlns="http://camel.apache.org/schema/spring"> <route> <from uri="spring-amqp:KipcastDirect:KipcastQueue:KipcastRouting?type=direct&autodelete=true&durable=true" /> <log message="Message available on a RabbitMQ Queue" /> <process ref="processorTest" /> </route> </camelContext> <rabbit:connection-factory id="amqpConnectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="amqpConnectionFactory" message-converter="messageConverter" exchange="KipcastBean" /> <rabbit:admin connection-factory="amqpConnectionFactory"/> <bean id="amqpConnectionFactory" class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory"> <property name="host" value="10.211.55.20"/> <property name="port" value="5672"/> <property name="username" value="guest"/> <property name="password" value="guest"/> <property name="virtualHost" value="/"/> </bean> <bean id="jsonMessageConverter" class="amqp.spring.converter.XStreamConverter"/> <bean id="textMessageConverter" class="amqp.spring.converter.StringConverter"/> <bean id="messageConverter" class="amqp.spring.converter.ContentTypeConverterFactory"> <property name="converters"> <map> <entry key="application/json" value-ref="jsonMessageConverter"/> <entry key="application/xml" value-ref="textMessageConverter"/> </map> </property> <property name="fallbackConverter" ref="textMessageConverter"/> </bean> </beans> |
In this case, a route starting from a RabbitMQ queue to a system log and a listener on your queue that will be active until you terminate your maven came:run process has been created.
It’s very important to note that, on Spring XML & has to be quoted &
The following Java code should be used send a message to the Exchange defined on Camel Route:
@Test public void test() throws KeyManagementException, NoSuchAlgorithmException, URISyntaxException, IOException { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("10.211.55.20"); factory.setPort(5672); factory.setVirtualHost("/"); factory.setUsername("guest"); factory.setPassword("guest"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.exchangeDeclare("KipcastDirect", "direct", true, /* durable */ true, /* autodelete */ null); /* */ byte[] messageBodyBytes = "Hello, world!".getBytes(); AMQP.BasicProperties.Builder basic = new AMQP.BasicProperties.Builder(); AMQP.BasicProperties minBasic = basic.build(); minBasic = basic.priority(0).deliveryMode(1).build(); channel.basicPublish("KipcastDirect", "KipcastRouting", minBasic, messageBodyBytes); System.out.println(" [x] Sent "); channel.close(); } |
To test if listener works, for first run the queue listener and, after that, run the Junit class to send message. The output will be:
[pache.camel.spring.Main.main()] MainSupport INFO Apache Camel 2.10.3 starting [pache.camel.spring.Main.main()] SpringCamelContext INFO Apache Camel 2.10.3 (CamelContext: camel-1) is starting [pache.camel.spring.Main.main()] ManagementStrategyFactory INFO JMX enabled. [pache.camel.spring.Main.main()] DefaultTypeConverter INFO Loaded 177 type converters [pache.camel.spring.Main.main()] SpringAMQPComponent INFO Found AMQP ConnectionFactory in registry for 10.211.55.20 [pache.camel.spring.Main.main()] SpringAMQPComponent INFO Found AMQP Template in registry [pache.camel.spring.Main.main()] SpringAMQPComponent INFO Found AMQP Administrator in registry [pache.camel.spring.Main.main()] SpringAMQPEndpoint INFO Creating endpoint for KipcastDirect:KipcastQueue:KipcastRouting [pache.camel.spring.Main.main()] SpringAMQPConsumer INFO Declared exchange KipcastDirect [pache.camel.spring.Main.main()] SpringAMQPConsumer INFO Declared queue KipcastQueue [pache.camel.spring.Main.main()] SpringAMQPConsumer INFO Declaring binding KipcastRouting [pache.camel.spring.Main.main()] SpringAMQPConsumer INFO Started AMQP Async Listeners for spring-amqp://KipcastDirect:KipcastQueue:KipcastRouting?autodelete=true&durable=true&type=direct [pache.camel.spring.Main.main()] SpringCamelContext INFO Route: route1 started and consuming from: Endpoint[spring-amqp://KipcastDirect:KipcastQueue:KipcastRouting?autodelete=true&durable=true&type=direct] [pache.camel.spring.Main.main()] ultManagementLifecycleStrategy INFO StatisticsLevel at All so enabling load performance statistics [pache.camel.spring.Main.main()] SpringCamelContext INFO Total 1 routes, of which 1 is started. [pache.camel.spring.Main.main()] SpringCamelContext INFO Apache Camel 2.10.3 (CamelContext: camel-1) started in 0.505 seconds [ SimpleAsyncTaskExecutor-1] route1 INFO Message available on a RabbitMQ Queue |
At this point, you can have fun with Camel and RabbitMQ!!!!!
NOTES:
1 – Please be careful: the URI (from and to) on Camel Spring DSL context and JUnit class must refer to same Exchange and Queue to prevent a reply-text=PRECONDITION_FAILED – parameters for queue ‘QUEUE’ in vhost ‘/’ not equivalen error or similar. To check the queues/exchanges configuration parameter using:
rabbitmqadmin -V / list queue rabbitmqadmin -V test list exchanges |
if you like this post, please click on the advertise :)