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

Multicast

Delayer

Unlike a throttler, which only slows down messages if the rate exceeds a treshold, a delayer delays every messages with a fixed amount of time. An example: to delay every message going from seda:a to mock:a with 1 second, you write...Multicast allows you to send a message to multiple endpoints at the same time. In a simple route, you can specify multiple targets in the to or → method call:

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

You can also explicitly define an explicit multicast in your RouteBuilder:Our second example will delay the entire block (containing mock:c) without doing anything to mock:b

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

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Load balancer

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.distribute the message handling load over multiple endpoints, we add a loadbalance to our route definition. You can optionally specify a load balancer strategy, like roundrobin

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

Multicast

Multicast allows you to send a message to multiple endpoints at the same time. In a simple route, you can specify multiple targets in the to or → method call:

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

You can also explicitly define an explicit multicast in your RouteBuilder:

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

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Recipient list

You can handle a static recipient list with a multicast or pipeline , but this EIP is usually applied when you want to dynamically determine the name(s) of the next endpoint(s) to route to. Use the recipients() method with a function literal (Exchange => Any) that returns the endpoint name(s). In the example below, the target endpoint name can be found in the String message starting at position 21.

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

Throttler

The throttler allows you to slow down messages before sending them along. The throttle methods allows you to specify the maximum throughput rate of message:

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

It can also be used in front of block to throttle messages at that point. In the example below, message are passed on to mock:b in a normal rate (i.e. as fast as possible), but a maximum 3 messages/2 seconds will arrive at the mock:c endpoint.

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

Message transformation

Content enricher

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• Message Channel
• Message
• Message Router
• Message Translator
• Message Endpoint
• Point to Point Channel
• Publish Subscribe Channel
• Dead Letter Channel
• Guaranteed Delivery
• Message Bus
• Correlation Identifier
• Aggregator
• Resequencer
• Routing Slip
• Throttler
• Delayer
• Load Balancer
• 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