This benefit extends to the design of programming interfaces. In a nice acknowledgment to Constantine and Yourdon 's work , Kent Beck remarked appropriately that "People who could not do a decent job with structured design went to objects so noone would notice. For example, a new order not only has to go through credit checking but inventory might also have to be verified. The semantics of the interaction, however, are not much decoupled. I think that assisted model generation using attributes can help in this category. However, once we started talking we realized that there are a lot of nuances and related topics to layering that are quite worthwhile discussing. So as in most cases, the world is not exactly black and white. No, not the tv show, but the Connected Systems Infrastructure. These tools make our lives easier because they do a lot of the grunt work for us. All I have to do is know a file name or a URI and bytes come streaming in and out. Therefore the name "Enterprise Integration Patterns". This metaphor works especially well in the world of messaging where we have a message object that represents a portion of the interaction. A key aspect of composability is that something must perform the composition. LinqThe killer app for all the new features is certainly Linq. We are often led to believe that everything that sits in an XML file can be considered configuration. For example, if the service provided an operation that can verify a credit card supplied by a customer we might simply name the channel VerifyCreditCard. The main activities of the workflow are send and receive. So let's whoop up some nUnit test cases to specify the behavior we discussed. And I was able to squeeze in an article for ObjektSpektrum in Germany. If my system is composable, that is very easy to do. This exercise is quite similar to the architecture guessing game I talked about before. Levels of AbstractionThe primary technique of making developers' lives easier is to raise the level of abstraction at which they have to work. Since it was going to be the first book about patterns in the integration space we wanted to put the broadest possible footprint down. The weakness of sequence diagrams have long been the number one target in the UML specification. This gives a user very little guidance as to where to get started. Even the OMG took NoticeIt is a popular hobby to poke fun at the OMG. Classes that do not carry this attribute might only be included in a more detailed diagram. These questions rarely come up in the world of synchronous, object-oriented applications. For me, this was Jerry Sussman's talk with the illustrious title Why Programming is a Good Medium for Expressing Poorly Understood and Sloppily Formulated Ideas. I am sure everyone who has played with certificates and WSE configuration will appreciate this new feature. Classes tend to be rather fine-grained so that the structure composed of the individual elements is often the key design artifact. It would be a huge pain to have to correlate and synchronize for every method call! An interesting theme during the panel focused on how much a methodology and notation can help developers come up with good designs. They are more loosely coupled and allow free composition of individual components into a larger system, thus aiding reuse and flexibility. Somehow "O"rchestration must have fallen out of favor with the marketing department. Oh well, this is not the bile blog so let's focus on the bright side of life. ConclusionComposability is a major ingredient into making system adaptable and promoting reuse. One user group that is all too often forgotten from the usability effort, however, are other programmers.
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