Oracle Visual Builder: Applications That Outlive Their First Release · Module 9 · Fragments, components and reuse
What breaks: two reuse failures
Lesson 97 of 176 · 3 min
A FRAGMENT WITH SO MANY PARAMETERS IT WOULD HAVE BEEN SIMPLER TWICE, and A SHARED COMPONENT CHANGED UNDER THREE APPLICATIONS. THE OVER-PARAMETERISED FRAGMENT IS THE ONE THAT LOOKS LIKE GOOD ENGINEERING THE WHOLE TIME IT IS BEING BUILT. Extracted from two pages, then bent to fit a third, then a fourth — and each parameter was a reasonable response to a real requirement. Lesson 3, and at seven parameters, four of them booleans switching sections on and off, it is harder to read than the copies would have been. THE TELL IS THAT NOBODY CAN USE IT WITHOUT READING IT. A well-shaped fragment is placed and given the two things it needs; this one requires studying its internals to work out which combination of flags produces the layout you want. Which means it is not reuse — it is a shared thing everybody has to understand fully, which is the…
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