Routes
Camel supports the definition of routing rules using a Java DSL (domain specific language) which avoids the need for cumbersome XML using a RouteBuilder.
For example a simple route can be created as follows.
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{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/builder/RouteBuilderTest.java} |
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 fromF
and toF
that uses String formatting to build the URI.
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{snippet:id=e1|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/processor/RouteFormattedUriTest.java} |
Filters
You can combine simple routes with filters which can be arbitrary Predicate implementations.
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{snippet:id=e2|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/builder/RouteBuilderTest.java} |
Choices
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.
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{snippet:id=e3|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/builder/RouteBuilderTest.java} |
Using a custom processor
Here is an example of using a custom Processor
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{snippet:id=e4|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/builder/RouteBuilderTest.java} |
You can mix and match custom processors with filters and choices.
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{snippet:id=e5|lang=java|url=camel/trunk/camel-core/src/test/java/org/apache/camel/builder/RouteBuilderTest.java} |