Cost Communication

• Exporting Statistics - Wrapper can export statistics through two special methods attribute and extent attached to each interface description.

• Exporting Formulae - Wrapper specific cost formulae can be described using rules.

  For example,
  
  select(C, A = V ) <== CountObject = C.CountObject * selectivity(A, V) TotalSize = CountObject * C.ObjectSize TotalTime = C.TotalTime + C.TotalSize * 25

• Mediator selects the most specific rule.

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