Transformer

EIP reference for Transformer can be found here - http://www.eaipatterns.com/MessageTransformationIntro.html

Continuation from Transformer could be expressed using '-->' operator.

Transformer

val transformer = transform.using { m: Message[_] => m }

If you need to add any extra properties to the Transformer you may do so using where method which accepts named parameters.

For example:

val transformerA = transform.using { m: Message[_] => m } where(name="myTransformer") //infix

val transformerB = transform.using { m: Message[_] => m }.where(name="myTransformer") 

will produce a Transformer named 'myTransformer'.

Unlike [Service Activator] (https://github.com/SpringSource/spring-integration-scala/wiki/Service-Activator) Transformer's handle.using method signature is:

def using(function:Function1[_,AnyRef])

That is done to guard from Functions that return Unit since it woud violate the contract of the Transformer which must always return a value that is not Void/Unit.

[Back to Reference] (https://github.com/SpringSource/spring-integration-scala/wiki/Reference)