As good as unit testing is, I wanted some good error handling inside
CFC's when things go badly wrong.

At first I used try/catch around DAO's methods and inside the
<cfcatch> I used a NotificationService to send an email to 'support'
and return false to the service CFC that called it.

I then realised that having the DAO use the NotificationService was
again giving it a responsibility it shouldn't have.

So I changed the DAO by removing the <cftry><cfcatch> and let it throw
an error. I then put the <cftry><cfcatch> around the service cfc
method that called the DAO and have the service use
NotificationService in the <cfcatch> to send the email (and pager
message possibly on some of the business-critical cfc's)

I feel more comfortable with this as I think the Service is the best
place to do application-specific tasks rather than have my domain
cfc's do this.

I also noted Martin Fowler's description of a service layer (from
Patterns of Enterprise Application Architecture ) suggesting this was
the best place for application-specific jobs, making the domain
objects more reusable as a result.

Do others agree?

PS This is a good list. I'm quite good at starting discussions then
letting the experts finish them :-)  Thanks everyone!


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