ü Readability (names, sizes, modularity, etc.) ü Dependency injection (use parameters), ü separation of concerns (patterns), ü Low Coupling (use, has, is, et al)
could be measured or analyzed? A bad design smells. Robert C. Martin describes the following odors (among others): 1. Rigidity – The system is hard to change because every change forces many other changes. 2. Fragility – Changes cause the system to break in conceptually unrelated places. 3. Immobility – It’s hard to disentangle the system into reusable components. 4. Viscosity – Doing things right is harder than doing things wrong. 5. Opacity – It is hard to read and understand. It does not express its intent well.
Definition § Cycled components can only be used together: they can only be tested, reused, deployed and understood together. § Every node on a cycle depends on any other.
Dependencies Principle § Avoid dependency cycles § Tangle. A subgraph with at least two nodes, where each node is reachable from each other. § Tangled metric. values greater zero indicate cyclic dependencies.
of a Package § Express the portion of contained abstract types. § It is a value 0 to 1: 0 (only concrete classes) to 1 (only interfaces and abstract classes)
of a Package § Indicates whether the package is mainly used by other artifacts (stable – hard to change) or if it mainly depends on other artifacts (instable – changeable). § It is a value 0 to 1: 0 only incoming dependencies to 1 (only outgoing dependencies)
of a Package § Indicates whether the package is mainly used by other artifacts (stable – hard to change) or if it mainly depends on other artifacts (instable – changeable). § It is a value 0 to 1: 0 only incoming dependencies to 1 (only outgoing dependencies)
Dependency Principle § Every dependency between modules should terminate on a module whose Instability metric is less than or equal to the depending module's Instability metric. § Every dependency between modules should terminate on a module whose Abstractness metric is greater than or equal to the depending module's Abstractness metric.
1. Download and install STAN https://stan4j.com Stand alone or Eclipse plug-in 2. Review your “Robert C. Martin” metrics: Ca, Ce, I, A, D. 3. Review “Violations” report 4. Review “Distance” plot 5. Review Dependency / Composition Graph
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