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Friday, April 21, 2006 *-First Development Just yesterday I was having a conversation with a developer about �contract first� development. The individual was heading down the path of creating a contract prior to writing the code, as he had been instructed. But as a .Net developer, he interpreted this request as creating a �.Net contract�, not a �WSDL contract�. Naturally, I let this person know that I was interested in a �WSDL First Contract�, not a �Microsoft First Contract�. And as you might expect, the developer told me how there was no need to go �WSDL First� because if he went �Microsoft First�, he could then generate a WSDL. As if I hadn�t heard that one before� And once again, I had the same-ole discussion about how in SOA we would be creating interfaces completely separate from implementation � often with different groups of people � in different parts of the world � leveraging different reusable message components that would be related back to services front-ending multiple implementation platforms. He got it. �Microsoft First� won�t work in an enterprise setting. This discussion prompted me to ask some of our consultants if they were having good results with �WSDL First� and the responses were positive. However, one consultant communicated that he has been pushing this concept into the requirements gathering phase. He called it, �Spreadsheet First�. Most I.T. Business Analysts will not be comfortable with creating WSDL�s and we continue to have an �analysis impedance mismatch� between �legacy, silo-oriented Use Cases� and �client cases / service cases�. His solution was to use a simple spreadsheet to layout the operations, messages and constraints. He would then use the spreadsheet as input in design phase, where he�d bundle the operations into port types and services and translate the field types. One of the things I really like about SOA is having the service as unit of work. A service is right-sized for requirements gathering and specification. It is also right-sized for �Test Driven SOA�, but we�ll save that for another day� posted by jeff | 5:40 AM |
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