Metric Results

[ summary] [ packages] [ cycles] [ explanations]

The following document contains the results of a JDependmetric analysis. The various metrics are defined at the bottom of this document.

Summary

[ summary] [ packages] [ cycles] [ explanations]

Package TC AC CC AC EC A I D
examples 20020112 0 92% 8%
examples.nntp 50507 0 100% 0%
examples.ntp 20206 0 100% 0%
org.apache.commons.net 22517105 0.23 33% 44%
org.apache.commons.net.bsd 30315 0 83% 17%
org.apache.commons.net.ftp 16511210 0.31 83% 15%
org.apache.commons.net.ftp.parser 1741316 0.24 86% 9%
org.apache.commons.net.io 1311295 0.08 36% 57%
org.apache.commons.net.nntp 1311215 0.08 83% 9%
org.apache.commons.net.ntp 61517 0.17 88% 4%
org.apache.commons.net.pop3 50516 0 86% 14%
org.apache.commons.net.smtp 70716 0 86% 14%
org.apache.commons.net.telnet 1321124 0.15 67% 18%
org.apache.commons.net.tftp 102815 0.2 83% 3%
org.apache.commons.net.util 10123 0 60% 40%

Packages

[ summary] [ packages] [ cycles] [ explanations]

examples.nntp

Afferent CouplingsEfferent CouplingsAbstractnessInstabilityDistance
07 0% 100% 0%
Abstract ClassesConcrete ClassesUsed by PackagesUses Packages
None None

examples.ntp

Afferent CouplingsEfferent CouplingsAbstractnessInstabilityDistance
06 0% 100% 0%
Abstract ClassesConcrete ClassesUsed by PackagesUses Packages
None None

org.apache.commons.net.bsd

Afferent CouplingsEfferent CouplingsAbstractnessInstabilityDistance
15 0% 83% 17%
Abstract ClassesConcrete ClassesUsed by PackagesUses Packages
None

org.apache.commons.net.ntp

Afferent CouplingsEfferent CouplingsAbstractnessInstabilityDistance
17 17% 88% 4%
Abstract ClassesConcrete ClassesUsed by PackagesUses Packages

org.apache.commons.net.pop3

Afferent CouplingsEfferent CouplingsAbstractnessInstabilityDistance
16 0% 86% 14%
Abstract ClassesConcrete ClassesUsed by PackagesUses Packages
None

org.apache.commons.net.smtp

Afferent CouplingsEfferent CouplingsAbstractnessInstabilityDistance
16 0% 86% 14%
Abstract ClassesConcrete ClassesUsed by PackagesUses Packages
None

org.apache.commons.net.util

Afferent CouplingsEfferent CouplingsAbstractnessInstabilityDistance
23 0% 60% 40%
Abstract ClassesConcrete ClassesUsed by PackagesUses Packages
None

Cycles

[ summary] [ packages] [ cycles] [ explanations]

PackageCyclic Dependencies
examples
  • org.apache.commons.net.ftp
  • org.apache.commons.net.ftp.parser
  • org.apache.commons.net.ftp
examples.nntp
  • examples
  • org.apache.commons.net.ftp
  • org.apache.commons.net.ftp.parser
  • org.apache.commons.net.ftp
org.apache.commons.net.ftp
  • org.apache.commons.net.ftp.parser
  • org.apache.commons.net.ftp
org.apache.commons.net.ftp.parser
  • org.apache.commons.net.ftp
  • org.apache.commons.net.ftp.parser

Explanations

[ summary] [ packages] [ cycles] [ explanations]

The following explanations are for quick reference and are lifted directly from the original JDepend documentation.

TermDescription
Number of ClassesThe number of concrete and abstract classes (and interfaces) in the package is an indicator of the extensibility of the package.
Afferent CouplingsThe number of other packages that depend upon classes within the package is an indicator of the package's responsibility.
Efferent CouplingsThe number of other packages that the classes in the package depend upon is an indicator of the package's independence.
AbstractnessThe ratio of the number of abstract classes (and interfaces) in the analyzed package to the total number of classes in the analyzed package. The range for this metric is 0 to 1, with A=0 indicating a completely concrete package and A=1 indicating a completely abstract package.
InstabilityThe ratio of efferent coupling (Ce) to total coupling (Ce / (Ce + Ca)). This metric is an indicator of the package's resilience to change. The range for this metric is 0 to 1, with I=0 indicating a completely stable package and I=1 indicating a completely instable package.
DistanceThe perpendicular distance of a package from the idealized line A + I = 1. This metric is an indicator of the package's balance between abstractness and stability. A package squarely on the main sequence is optimally balanced with respect to its abstractness and stability. Ideal packages are either completely abstract and stable (x=0, y=1) or completely concrete and instable (x=1, y=0). The range for this metric is 0 to 1, with D=0 indicating a package that is coincident with the main sequence and D=1 indicating a package that is as far from the main sequence as possible.
CyclesPackages participating in a package dependency cycle are in a deadly embrace with respect to reusability and their release cycle. Package dependency cycles can be easily identified by reviewing the textual reports of dependency cycles. Once these dependency cycles have been identified with JDepend, they can be broken by employing various object-oriented techniques.