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Complexity

Overview

Waltz can calculate a basic complexity score for each application. The current implementation uses a formula like:

maxConn = maximumNumberOfLogicalFlowsForAnyApp
appConn = totalNuberOfLogicalFlowsForThisApp

maxServers = maximumNumberOfServersForAnyApp
appServers = totalNuberOfServersForThisApp

maxViewpoints = maximumNumberOfViewpointsUsedByAnyApp
appViewpoints = totalNumberOfViewpointsUsedByThisApp

connectionComplexity = log(appConn) / log(maxConn)
serverComplexity = log(appConn) / log(maxConn)
viewpointComplexity = appViewpoints / maxViewpoints
            
totalComplexity = serverComplexity + connectionComplexity + viewpointComplexity

Note that server and connection complexities are scaled so that the marginal 'cost' of adding new servers and connections diminishes. However viewpoint complexity does not.

Schema

Table: Complexity Score

Column Description Example
entity_kind Kind of entity being scored APPLICATION
entity_id Id of entity being score 123456
complexity_kind type of complexity being measured MEASURABLE
score (decimal 10,3) amount 0.7

Valid complexity kinds:

  • CONNECTION
  • MEASURABLE (viewpoint)
  • SERVER
  • TOTAL

Future Enhancements

Plan is to allow for custom complexity kinds to be introduced an provide a simple way for developers to plug in their own calculators.

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