Comments on: Cairngorm Patterns: Batch Commands

By: Amichai Lesser

Amichai Lesser — Fri, 01 May 2009 16:58:38 +0000

Nice post.
In the following post http://www.awholenewweb.com/?p=51 I share an example in which I extended the events and commands to support Undo operations. I also needed to find a good way to avoid the N event files 1 for each data point in my model but I solved it by making the value object update its own properties.
Your approach seems applicable for many other use cases, thanks for sharing.

By: Steve Brownlee

Steve Brownlee — Fri, 24 Apr 2009 14:59:27 +0000

@Karl: Yes, I did not like the implementation of SequenceCommand because, imo, it broke the basic purpose of the Command pattern. This keeps each Command independent and decoupled from any other logic in the system.

By: Karl Sigiscar

Karl Sigiscar — Fri, 24 Apr 2009 14:34:22 +0000

Very useful indeed. I previously used SequenceCommand and nextEvent but this requires to do something special in each command.

Your approach seems to not require any modification to commands.