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{snippet:id=block|lang=java|url=activemq/camel/trunk/components/camel-scala/src/test/scala/org/apache/camel/scala/dsl/PipelineRouteBuilderTest.scala}

Filter

Anchor
filter filter

For a message filter, use the when() method with a parameter of type The Exchange ⇒ Boolean. In the example below, we use a Scala convenience method named in to access the 'in' message body; only messages where the 'in' message is <hello/> will arrive at the mock:a endpoint.

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{snippet:id=alternatives|lang=java|url=activemq/camel/trunk/components/camel-scala/src/test/scala/org/apache/camel/scala/dsl/FilterRouteBuilderTest.scala}

Message routing

Content based router

Similar to the Filter , the content based router uses when methods with Exchange ⇒ Boolean function literals and an optional otherwise. The function literal can contain plain Scala code as well as any of the supported languages . The example below routes a given message based on the language of the message body.

{snippet:id=cbr|lang=java|url=activemq/camel/trunk/components/camel-scala/src/test/scala/org/apache/camel/scala/dsl/ContentBasedRouterTest.scala}

Splitter

To handle large message in smaller chunks, you can write a Scala Exchange ⇒ Any* method and add it to your route with the splitter method. As with many other EIPs, we support a short, in-line version as well as a more elaborate block based one.

{snippet:id=simple|lang=java|url=activemq/camel/trunk/components/camel-scala/src/test/scala/org/apache/camel/scala/dsl/SplitterRouteBuilderTest.scala}

{snippet:id=block|lang=java|url=activemq/camel/trunk/components/camel-scala/src/test/scala/org/apache/camel/scala/dsl/SplitterRouteBuilderTest.scala}

The above examples also show you how other languages like XPath can be within the Scala DSL.

TODO

TODO: Create a Scala alternative and example for every EIP available on http://activemq.apache.org/camel/enterprise-integration-patterns.html

• Message Channel
• MessagePipes and Filters
• Message Router
• Message Translator
• Message Endpoint
• Point to Point Channel
• Publish Subscribe Channel
• Dead Letter Channel
• Guaranteed Delivery
• Message Bus
• Correlation IdentifierContent Based Router
• Message Filter
• Recipient ListSplitter
• Aggregator
• Resequencer
• Routing Slip
• Throttler
• Delayer
• Load Balancer
• Multicast
• Content Enricher
• Content Filter
• Normalizer
• Messaging Mapper
• Event Driven Consumer
• Polling Consumer
• Competing Consumers
• Message Dispatcher
• Selective Consumer
• Durable Subscriber
• Idempotent Consumer
• Transactional Client
• Messaging Gateway
• Service Activator
• Wire Tap