Zeichick's Take: Snacks in the Break Room



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February 15, 2007 —  (Page 1 of 2)
I once worked at a company that took up two full floors of a large office building. Each floor had two identical break rooms, equipped with tables, coffee maker, microwave, refrigerator and vending machines. Employees hung out in their own break room, mingling and chatting, having lunch, enjoying a hot beverage and even holding informal meetings.

Except, that is, when the members of one department brought in snacks. One small department, for example, had a regular weekly "goody day," when they rotated bringing in cookies or pastries. They were clearly marked "for such-and-such department"—but to nobody's surprise, nearly everyone in the company managed to sneak down to that department's break room for free treats.

After a few months, the departmental goody day was abandoned: too many people eating the home-baked food, not enough people supplying the goodies.

I was reminded of this last week, during an enjoyable visit with Miko Matsumura, VP of SOA product marketing at WebMethods. Conversations with Miko are always enjoyable; he's a big-picture thinker and sincere technology evangelist, one of the brightest young talents in our industry today.

The analogy, of course, is to SOA. In a service-oriented architecture, some applications publish services, and others consume them. The problem is that in an unmanaged SOA, you don't know who is consuming those services, just as you don't know who is eating Sally's brownies. Because you don't know who is consuming those services, you don't know who is relying upon them—and where you might have undocumented dependency issues that could come back to bite you later. If you take down a service that you published for your own department's applications to consume, some other application halfway across the company might suddenly fail.

None of this is strictly new, of course; we've faced this issue as long as we've had publish/subscribe methodologies. Web services and SOA, however, scale the problem tremendously.

A challenge, argues Miko convincingly, is that SOAs require implicit and explicit service guarantees—actually, he calls them agreements. The application publishing the service agrees to interoperate, to be available, to provide results to within a specified accuracy or reliability, and to provide an agreed-upon response time. The application consuming the service agrees to use it responsibly, and if necessary, compensate the service for its effort.




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