object

coupling_metric

Computes entity efferent coupling, afferent coupling, and instability.

Author: Ebrahim Azarisooreh and Paulo Moura
Version: 0.12
Date: 2018/7/17
Compilation flags:
static, context_switching_calls
Imports:

Public interface

(see related entities)

Protected interface

(see related entities)

Private predicates

(see related entities)

Operators

(none)

Remarks

  • Efferent coupling (Ce): Number of entities that an entity depends on.
  • Afferent coupling (Ca): Number of entities that depend on an entity.
  • Instability (I): Computed as Ce / (Ce + Ca). Measures the entity resilience to change. Ranging from 0 to 1, with 0 indicating a maximally stable entity and 1 indicating a maximally unstable entity. Ideally, an entity is either maximally stable or maximally unstable.
  • Abstractness (A): Computed as the ratio between the number of static predicates with scope directives without a local definition and the number of static predicates with scope directives. Measures the rigidity of an entity. Ranging from 0 to 1, with 0 indicating a fully concrete entity and 1 indicating a fully abstract entity.
  • Entity score: Represented as the compound term ce_ca_i_a(Ce,Ca,I,A).
  • Dependencies count: Includes direct entity relations plus calls or dynamic updates to predicates in external objects or categories.