Object Mentor Blog: A Rational Plan to Start using SOA

A Rational Plan to Start using SOA

Uncle Bob — Sun, 21 Oct 2007 05:00:09 -0500

Many companies are thinking about adopting SOA as a way to reduce the cost of enterprise development. The thought of diverse and reusable services, effortlessly communicating through an intelligent Enterprise Service Bus is a powerful siren song for executives who see their development and maintenance budgets spiraling upwards. What’s more, vendors are displaying savory looking wares that promise to ease the transition.

Caveat Emptor!

The reality is that cramming an old and rickety enterprise system into services that communicate over a complex buss, is not an easy job. The long and short of the problem can be seen in the following catch-22:

The benefit of SOA comes from the decoupled nature of the services. But in order to create an SOA you have to decouple your services.

Decoupling your services is the issue. Once you have decoupled them, then all the wonderful tools might be useful in facilitating an SOA. On the other hand, if you have decoupled your services, you probably don’t need all those wonderful tools.

I have a client that has implemented SOA to good effect. They avoided the vast majority of the tools. For example, they are not using a big expensive buss. They aren’t using a BPEL engine, or message translators, or routing services. About the only thing they have decided to use is SOAP.

They are creating their services from scratch, and wiring the system together manually. Each service knows where each of it’s client services is. There is no registry service, no common dictionary, no fancy routing.

The system is simple, elegant, and it works. It was designed to work from the start. It is not an old crufty system crammed under a soap layer and called a service provider. Rather it is a nicely arrayed suite of services that were designed to work together from the get-go.

And that’s really the moral of the story. If you want an SOA, you are going to have to design that SOA. It is not very likely that you will be able to cram you old, tightly-coupled code below SOAP interfaces and hope to gain the benefits of services. What you’ll more than likely end up with is just a bigger mess.

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