spring-bootapache-camelactivemq-classiccamel-http

Camel routes from activemq to rest endpoint


I am trying to use Spring Boot 1.5.2.RELEASE + Camel (Spring Boot starter) 2.19.2 to listen to ActiveMQ queue and then post the message to a rest endpoint URL (POST method) as its body. What would be the best possible way to achieve this? I have gathered pieces of information and am trying to tie it all together but getting a bit confused.

Here is what I have gathered for Camel Rest DSL, I am not too sure if camel below is creating these rest services via this or is it just an already exposed endpoint, in my case it is an already exposed endpoint

rest("/basePath")
  post("/someEndpoint").to("direct:restEndpoint")

Using the above is what I have gathered for ActiveMQ which I am not too sure is correct

from("activemq:queue:<queue_name>").to("direct:restEndpoint")

But again, I am not too sure how to listen to the ActiveMQ queue for new messages or is it something that Camel would do by default always? Additionally, I need to pass the message as a post body to my rest endpoint. I also saw some references to camel-http4 and camel-http as well and I am completely confused.

Any assistance would be greatly appreciated.


Solution

  • Some confusion is common when starting to use Camel, but your final solution will look something like:

    from("activemq:queue:my-route")
      .process(/* change the in/out messages if you need to */)
      .to("http4://your-endpoint.com");
    

    Don't try to simply copy/paste this code until it works. My Camel rule of thumb is: always read the component documentation and try playing with it using it in your software. In your case I suggest:

    1. Read ActiveMQ component docs and try reading from ActiveMQ / writing to a Log;
    2. Generate some input from a Timer and send to your Rest endpoint using HTTP4 Component;

    Your first routes will take some time for simple things but you will get on flow quickly.