Tuesday, January 30, 2007

Morning Coffee 20

• Jim Gray has been missing at sea since Sunday. My thoughts are with him. (via Werner Vogels)
• We launched Windows Vista and Office 2007 yesterday. There were parties on campus, but my office is a little off the beaten path, so we didn't get a party.
• WF Activity Validation is very cool, but make sure you put your activities into a separate project from your workflows. It took me a few minutes yesterday to figure this out, but the validators are invoked not only for the activities in workflows, but for the actual activity implementation itself. My validation logic is checking to ensure properties are specified and that given activities are or are not inside a transaction scope. Obviously, the activity implementation is invalid according to these rules. Also, you need to remove the Workflow.Targets import from your activity project file, as that is what invokes the activity validation.
• A quick follow-up to yesterday's compiling workflows post: WF appears to be fairly short on out of the box functionality, but more than makes up for it with an expansive extensibility model. It makes the learning curve longer, but it's well worth it the trip.
• I'm demoing the result of the proof of concept work we've done over the last few months today. It's been a while since I've presented to any kind of audience so we'll see how it goes.