com.busit

Interface Transformer

public interface Transformer

Method Summary

Methods

Modifier and Type	Method and Description
boolean	test() Test preconditions for this app.
Message	transform(Message message, Channel in, Channel out) Alter data from the input channel to match the selected output channel.

Method Detail

transform

Message transform(Message message,
                Channel in,
                Channel out)
                  throws Exception

Alter data from the input channel to match the selected output channel. When a message arrives in a 'in' channel, this method will be called once for each meaningful 'out' (that have at least one chained app). Implementation can alter the original message or completely forge a new one.

Parameters:

message - The original message.

in - The input channel the message is coming from.

out - The desired ouput channel which specifies the type of transformation.

Returns:

The altered message(s) or null to interrupt the app chain flow.

Throws:

Exception - If any exception is thrown, it has the same effect as calling App.notifyOwner(e.getMessage(), e) and then returning null.

test

boolean test()
             throws Exception

Test preconditions for this app. The current instance will be fully populated and configured. Implementation should check its own dependencies and the current settings.

Returns:

true if the app instance meets all preconditions, false otherwise.

Throws:

Exceptions - If any exception is thrown, it has the same effect as calling App.notifyOwner(e.getMessage(), e) and then returning false.

Exception