Hi Brian

I have just seen your webcast about EMAB (thanks to the archives). First thank you, it was good see the "EMAB documentation" alive (less boring than the .chm help file). Any contributions to the Application Blocks are welcome!

In one of my project (January 2004), we used the EMAB, CMAB, DAAB, and LAB (and EIF and WSE 2.0 for compile time!) in order to create a more friendly and unify "Infrastructure" library for Enterprise Solutions (glad to hear about "Entriprise Library").

I was in charged of the logging aspect of that Infrastructure library, so I used EMAB, LAB (EIF and WSE) to do the functionnality. Microsoft were already talking (mid-2003) about unifying the "logging" tasks for application (i.e. simplify EIF). I think LAB was their answer to that (correct me if I am wrong).

However, I found no way to log a .NET exception using the LAB (up to now).

Although I like the LAB with its classification of events, the event for managing "Error" (i.e. ErrorEvent) does not manage "Exceptions". From one point of view, yes that is true, exceptions are just a structured mechanism to raise errors. However I found it a bit odd not to be able to log a basic .NET Exceptions (and preserving its type). The only way with LAB is to get the message from the exception and put it the message field of the ErrorEvent (in the LAB).
That is why I have kept the EMAB to publish exception (and preserved their type up to publishing time).

My question is:

# Do you know whether the fact to not be able to publish directly a .NET exception using the LAB is a "Microsoft by design"? or did I miss something?

Thank you.

Joao

Yes, I believe at this point, it was by design. The idea of the application blocks it that they are like Legos. If you need Exception Logging, use the EMAB. If you need Configuration Data management, use the CMAB. If you need other forms of logging, use LAB. For the future I can see where they would unify LAB and EMAB, but you have to keep in mind that EMAB came out almost 2 years ago, and LAB really resulted from people saying that they liked the extensible publisher model, but they wanted to be able to publish other information. So why duplicate the EMAB capability in LAB when all you need to do is use EMAB as well.

HTH,
Brian

Thanks for your reply.

Yes, we end up by using both at the end. Although at the time (January 2004) I did not fully understand the design of the LAB (and its lack for publishing Exception), the decision to use both Application blocks was not simple and direct (it was a pragmatic one, i.e. I did not know how to do without EMAB :)

In the team, there were a lot of different point of views on both Application Blocks. We had different expectations from them.

The fact you raised about the 2 years between both seems to be where (I think) the "problem" lies. When LAB was released (2003), the expectation we had of the LAB was to propose an unify Application block to log everything, included exceptions. That was not the case. From that expectation, we made another presemption that the EMAB was an obsolete Application block, which was untrue (I know it now).

Although the LAB documentation does mention about its custom publisher for the EMAB (so exceptions published via EMAB could be redirected to LAB), they do not highlight the fact to carry on using EMAB for exception publishing.

That makes more sense now. I am looking forward to seeing the "Enterprise Library" and its holistic design of all these useful Application blocks.

Thank you to put EMAB back in the front stage and all the useful information provided as part of the webcast.

Joao Morais

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