Enables the handler to signal to the Apps framework whether this handler should actually be executed for the message about to be sent.
The message which is being sent
An accessor to the environment
An accessor to the outside world
whether to run the execute or not
Method which is to be used to non-destructively enrich the message.
The message about to be sent
An accessor for modifying the message non-destructively
An accessor to the environment
An accessor to the outside world
An accessor to the App's persistence storage
the resulting message
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Handler called when an App wants to enrich a message.