Apache Camel offers a Java based DSL using the fluent builder style. The Java DSL is available by extending the RouteBuilder class, and implement the
This is best illustrate by an example. In the code below we create a new class called
MyRouteBuilder that extends the
org.apache.camel.builder.RouteBuilder from Camel.
configure method the Java DSL is at our disposal.
Then we use the Content Based Router (eg the choice) to route the message depending if the person is from London or not.
For example a simple route can be created as follows.
As you can see from the above Camel uses URIs to wire endpoints together.
URI String formatting
Available as of Camel 2.0
If you have endpoint URIs that accept options and you want to be able to substitute the value, e.g. build the URI by concat the strings together, then you can use the
java.lang.String.format method. But in Camel 2.0 we have added two convenient methods in the Java DSL so you can do
toF that uses String formatting to build the URI.
You can combine simple routes with filters which can be arbitrary Predicate implementations.
With a choice you provide a list of predicates and outcomes along with an optional default otherwise clause which is invoked if none of the conditions are met.
Using a custom processor
Here is an example of using a custom Processor
You can mix and match custom processors with filters and choices.
Here is an example of adding a few custom InterceptorProcessor objects to a processing pipeline:
When you start defining and interceptor stack with intercept(), you must follow up with the subsequent .target() so that the target of the interceptor stack is properly registered.