1 command with multiple handlers

[Loch]

Nservicebus allows you to attach Icommand and ievent marker interface to messages in order to help enforce certain best practices.  I do notice i am still allowed to have multiple handlers for the same command.  

In andreas ohlund ' s pluralsite course on nservicebus he provides an example.

Is this considered bad practice? 

Is there any valid use case for doing this?

 

[Mauro Servienti]

Hi,

you can now get rid of the interfaces if you prefer using the unobtrusive mode:

http://docs.particular.net/nservicebus/unobtrusive-mode-messages

having more than one handler in the same endpoint can be handy for a variety of reasons:

a) evolution/versioning: you can version your commands using commands inheritance (is a possible solution) and thus you can a handler for the “old” command and a handler for the new command what is happening in this case is that if someone sends the new command (that inherits from the old one) both handlers will be invoked;

b) security and validation: you can setup a “generic” handler handling “Object” or “IMessage” that will work as a catch all and for example perform common validation tasks in that handler, in this case you can specify message handling ordering:

http://docs.particular.net/nservicebus/how-do-i-specify-the-order-in-which-handlers-are-invoked

The above are the first 2 that came to my mind,

.m

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(no keyboard keys have been killed due to the really annoying OSX spell checker)

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