`FunctionExpression`

We introduced the FunctionExpression class (an implementation of SpEL’s Expression interface) to let us use lambdas and generics. The Function<T, R> option is provided for the DSL components, along with an expression option, when there is the implicit Strategy variant from Core Spring Integration. The following example shows how to use a function expression:

.enrich(e -> e.requestChannel("enrichChannel")
            .requestPayload(Message::getPayload)
            .propertyFunction("date", m -> new Date()))

The FunctionExpression also supports runtime type conversion, as is done in SpelExpression.