I have developed a web application which has a GUI (Presentation tier), Servlet classes for processing data (Business Logic Layer) and a RDBMS (Data Tier). Now my application also provides an API for some of its functionality, so when i represent the architecture will the API b part of Business logic or Presentation tier?
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It is probably most helpful to consider the API an alternative "presentation" tier. Unless your GUI code uses the same API itself, that is. – hmakholm left over Monica Aug 21 '11 at 23:19
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so if it uses the same API then it would come in Application tier? – Prim Aug 21 '11 at 23:30
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1Well, if it's the main API you have between the business logic and presentation layers, then that's a pretty unambiguous explanation of what it is, isn't it? – hmakholm left over Monica Aug 21 '11 at 23:32
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Q: Why must you consider the API a "tier"?
For the sake of argument, let's define a "tiers" as:
A structuring mechanism for the elements that make up the software solution
If you think about it this way, wouldn't your API cut across all three tiers (or at least across all of the tiers you've exposed with your API)?
paulsm4
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