# Wednesday, 12 December 2007

Commerce-Server-2007-Logo A while back a friend of mine posted a comment here asking me to describe what it's like developing with Commerce Server 2007. Initially I wanted to reply to him in comments but thinking more on it I really want to provide a different and real perspective on how Commerce Server is to work with as a product, a perspective in which I want to dig a deeper than the usual how-to and tutorials you see on the various Commerce Server blogs; mine included.

Check out part 1 Secure By Default where I discuss the security aspects of Commerce Server, part 2 Three-way Data Access in which I write about the various ways of getting data into your applications, part 3 Testability which not surprisingly is all about how CS lends itself to unit testing, and part 4 Magic Strings Galore where I take on low level aspects of the APIs.

Pipelines

When I first encountered pipelines in Commerce Server 2000 they were a nice feature to have available and they made sense because they handle a much bigger load due to the fact that they're essentially COM objects executed in an ordered fashion. All this made a great deal of sense back in the day when we were dealing with plain old VBScript and ASP.

When Commerce Server 2002 came out it still made sense that they stuck around because the .NET support in Commerce Server 2002 came in the form of managed wrappers for the COM objects which came with the product.

Would you be surprised to learn that COM based pipelines stuck around for Commerce Server 2007 too? Well they did which means that you have to know a little something about COM to get it going. Especially when it comes to debugging problems with a server setup. Weird HRESULTS is something you still have to contend with although the situation is vastly improved from the older versions.

Fortunately you can go ahead and build your pipeline components in .NET and expose those to COM so all is not lost. It does however mean that you need to make sure that your pipeline components behave as expected at runtime in order to avoid cycling objects in and out of the GAC. The keyword is developer productivity, you don't want to spend too much time mucking about with getting everything good to go for every little change you make to your pipeline components.

Traditionally pipelines is the area where people ask the most questions because it's a pretty opaque topic to dive into at first. Every time I create a new pipeline component it pains me to know that we have the nice System.Transactions namespace available to us in .NET.

Luckily Cactus feels our pain and has a replacement on their roadmap for the next version of Commerce Server but until then you better get those interop skills up to speed and. Alternatively you can choose to forego the pipeline system altogether and do any custom business logic outside pipeline components but that's not always an option.

Developing with Microsoft Commerce Server 2007 Part 6: Deployment

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