Many of the benefits of SOA derive from service reuse. Software reuse as a concept has been promoted for many years and proposed for many different technologies. Services represent a greater level of abstraction for designing and implementing reusable software, and XML and Web services are easier to use than their predecessors. But is it still too hard?
This, I believe, is what’s at the heart of David Chappell’s recent paper on reuse.
He says that almost everyone he has talked with during the past two years about SOA has said that achieving reuse with services is almost as hard as it was with objects.
Because reuse was promised and not really achieved with objects, and because it’s not much easier with services, David’s conclusion from his conversations appears to be that the industry is going to fail again.
He cites the usual difficulties with creating reusable services, including cultural challenges for developers (like my colleague Steve has written about), political problems (in which one department is not motivated to share the cost of reuse with another), and the fact that a service published for reuse might not contain all the features and functions some consumers require.
I do not agree with his assertions that the industry adopted objects, and will adopt services, simply because the big vendors push these technologies onto their customers. If these technologies were not addressing real customer problems – which is where vendors get their ideas for new features – customers would not buy and use them, no matter how hard vendors might push. Customers have a low tolerance in general for unuseful features (anyone remember “Bob“?)
However his conclusion is what bothers me, since he’s basically saying that reuse is still too hard. I wonder whether or not that’s true. Certainly I have heard a lot of success stories from our customers and from others at industry trade shows.
If it were it would be a serious disappointment. I certainly think that the current technologies for SOA – XML and Web services – represent a sufficient level of abstraction to achieve reuse.
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