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Building Tools
Component Architectures
Your workflow infrastructure falls conveniently into two main kinds of components:
• Frameworks that control things.
• Tools that do things.
The frameworks or control mechanisms decide what is processed, when it happens, and how it’s done. The “how” part of the equation is implemented as a series of tools or components.
Microsoft PowerShell uses this approach where you can create commandlets, providers, snap-ins, or services. UNIX uses this approach by virtue of its command line utilities and pipes. Mac OS X uses its GUI applications as component tools that it can send AppleEvents via its AppleScript infrastructure.
The Importance of Sticking to Guidelines
If you are building your workflow around ...
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