Java – use ActiveMQ, camel and spring to implement the request reply mode

I'm trying to implement the following features:

Then read the CSV file line by line:

>Build the request according to the value contained in this line > send the request to the message queue > other components need to get the message, process the request and send the response to another message queue (the producer knows, so the producer can get the response)

I believe the request reply pattern meets the requirements I installed ActiveMQ, downloaded camel and tried to use their JMS project

After configuring components, queues and test connections (work), I try to figure out how to actually implement request reply? I didn't find any good examples

I have a routebuilder

RouteBuilder

public class MyRouteBuilder extends RouteBuilder {
    public static void main(String[] args) throws Exception {
        new Main().run(args);
    }

    public void configure() {
        from("file:src/data?noop=true")
        .to("activemq:RequestQ");

        from("activemq:RequestQ?exchangePattern=InOut&timeToLive=5000") 
        .inOut("activemq:RequestQ","bean:myBean?method=someMethod"); 
    }
}

Camel's context xml

<beans xmlns="http://www.springframework.org/schema/beans"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="
         http://www.springframework.org/schema/beans 
         http://www.springframework.org/schema/beans/spring-beans.xsd
         http://camel.apache.org/schema/spring
         http://camel.apache.org/schema/spring/camel-spring.xsd">

    <camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
        <package>org.apache.camel.example.spring</package>
    </camelContext>

    <bean id="jmsConnectionFactory" 
        class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL" value="tcp://localhost:61616" />
    </bean>

    <bean id="pooledConnectionFactory" 
        class="org.apache.activemq.pool.PooledConnectionFactory" 
        init-method="start" destroy-method="stop">
        <property name="maxConnections" value="8" />
        <property name="connectionFactory" ref="jmsConnectionFactory" />
    </bean>

    <bean id="jmsConfig" 
        class="org.apache.camel.component.jms.JmsConfiguration">
        <property name="connectionFactory" ref="pooledConnectionFactory"/>
        <property name="concurrentConsumers" value="10"/>
    </bean>

    <bean id="activemq" 
        class="org.apache.activemq.camel.component.ActiveMQComponent">
        <property name="configuration" ref="jmsConfig"/>
    </bean>

    <bean id="myBean" class="org.apache.camel.example.spring.MyBean"/>
</beans>

Question:

>How to read a file, construct it line by line, and publish a message according to the line content? > How to configure routes and headers to get responses in a temporary queue that will be deleted after getting responses? > What quick start guides can you recommend?

edit

I got the following code work Now let's say I create a response in the processor How can I send it back? How do I respond?

public class MyRouteBuilder extends RouteBuilder {

    public static void main(String[] args) throws Exception {
        new Main().run(args);
    }

    public void configure() {
        from("file:/Users/aviad/ws/integ/src/data?fileName=lines.txt&noop=true&idempotent=true")
        .split()
        .tokenize("\\n")
        .inOut("activemq:req");

        from("activemq:req")
        .process(new Processor() {
            public void process(Exchange exchange) throws Exception {
                System.out.println(exchange.getIn().getBody(String.class));
                System.out.println("jmscorrelationid=" + exchange.getIn().getHeader("jmscorrelationid"));
                System.out.println("jmsdestination=" + exchange.getIn().getHeader("jmsdestination"));
            }
        });
    }
}

Solution

I just have something similar, so I change it, it's here Please note that the second path does not need to know the request / reply message explicitly, only the producer needs to know If there is a reply to the destination set (automatically processed by the hump), the second route will reply

I don't know any good examples, but this doc page is very comprehensive, with only small examples

<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
        <route>
          <from uri="file://c:/apps/in"/>
          <split>
            <tokenize token="\n"/>
            <to uri="activemq:req" pattern="InOut"/>
            <to uri="stream:out"/><!-- print Hello to console -->
          </split>
        </route>
        <route>
          <from uri="activemq:req"/>
            <transform>
              <simple>Hello ${in.body}</simple>
            </transform>
        </route>
    </camelContext>