object

coupling_metric

Computes entity efferent coupling, afferent coupling, and instability.

Availability:

logtalk_load(code_metrics(loader))

Author: Ebrahim Azarisooreh and Paulo Moura

Version: 0:14:0

Date: 2024-03-27

Compilation flags:

static, context_switching_calls

Imports:

public code_metrics_utilities

public code_metric

Uses:

list

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.

Inherited public predicates:

 all/0  all/1  all_score/1  check_option/1  check_options/1  default_option/1  default_options/1  directory/1  directory/2  directory_score/2  entity/1  entity_score/2  file/1  file/2  file_score/2  format_entity_score//2  library/1  library/2  library_score/2  option/2  option/3  rdirectory/1  rdirectory/2  rdirectory_score/2  rlibrary/1  rlibrary/2  rlibrary_score/2  valid_option/1  valid_options/1

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)