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Command Pattern - Deriving commands from UI

Wed, 01/20/2010 - 16:36 — anusha_d
Hi,

We are using CQRS in our project and we really appreciate the benefits that it gives in terms of developing the UI without being dependent on domain model. We are currently in process of generating commands from UI and handling those commands. The tricky part about our UI is we perform multiple actions before we want to persist to database. In sense we want to create composite command which in turn containg multiple sub commands when calling save. We are struggling on how to dervie the sub coammand within the composite commands?
Should the sub command be created as part of any UI action on the screen or should it happen at the end when final save is called by comparing the current view with the view that the UI should have started with? Is there any other alternative approach for the same?
Anusha.
‹ Design problem on consuming external libraries / services Any advice for my very first ddd project ? (BEGINNER) ›
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Hi Anusha, I have been

Hi Anusha,

I have been working with the CQRS pattern for a while, and hope I can help you with your question.

What I sense in your explanation is that you have multiple steps in your UI to do a single thing in your system.

In DDD, and even more so in CQRS, it is very important to see the Application perspective differently than your UI perspective. If it is 1 atomic operation for your application, you will have only 1 command. That command may be built up using several screens. In such case, you could use a command builder (builder pattern) and attach that to the user's session. When the command is completely built, send it to your command handler and deal with it the CQRS way.

In other words, a form submit does not have to be translated to a command one-to-one. You could perfectly have a wizard-like process to build up a single command.

Hope this helps.

Wed, 01/20/2010 - 23:18 — banq

hi

>how to dervie the sub coammand within the composite commands multiple actions ---> composite command ---> asyn domain Event.
Mon, 07/12/2010 - 18:14 — mikecriss

If you can write unit tests

If you can write unit tests for the ViewModel without creating any UI i shal be very thankful to you

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