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Apache Camel default data format for a component

How to set default data format for a component in Apache Camel?

I have a number of routes interacting with different ActiveMQ queues. At the moment all of them look like

from("...")
    .process(...)
    .marshal().json() // (1)
    .to("activemq:queue:...");

or

from("activemq:queue:...")
    .unmarshal().json() // (2)
    .process(...)
    .to("...");
  1. I would like to replace lines (1) and (2) with either component or context level configuration. Basically saying only once ‘message payload going through ActiveMQ has to be a JSON string’.
  2. I don’t like to add any additional routes, processors, headers, URI parameters, etc.
  3. Ideally, it would be applicable for other components and formats besides ActiveMQ and JSON
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Using interceptors (Based on Claus Ibsen's comment)

    new RouteBuilder() {
    @Override
    public void configure() throws Exception {

        // interceptors
        interceptSendToEndpoint("activemq:queue:*")
            .marshal()
            .json();

        interceptFrom("activemq:queue:*")
            .unmarshal()
            .json();

        // routes
        from("...")
            .process(...)
            .to("activemq:queue:...");

        from("activemq:queue:...")
            .process(...)
            .to("...");
    }
}

    Notes:

    1. interceptors have to be defined before any routes in RouteBuilder. Otherwise IllegalArgumentException is thrown explaining situation.
    2. interceptors are not shared and have to be defined in each RouteBuilder.

  2. 0

    You could marshall/unmarshall using a named reference to a data format that you can define once (here as “myDefaultFormat”) in your Camel Registry:

    from("activemq:queue:...")
.unmarshal(myDefaultFormat)

    This way, you dont have to repeat .json() everywhere
    (but ok, you have yet to repeat the named reference :-$ )

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