object

coupling_metric

Computes entity efferent coupling, afferent coupling, and instability.

Author: Ebrahim Azarisooreh and Paulo Moura
Version: 0:12:0
Date: 2018-07-17
Compilation flags:
static, context_switching_calls
Imports:
Uses:
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.

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)