Apache Commons logo Commons Logging

Metric Results

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

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

Summary

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

Package TC CC AC Ca Ce A I D V
org.apache.commons.logging 10 8 2 1 7 20.0% 88.0% 8.0% 1
org.apache.commons.logging.impl 18 18 0 1 13 0.0% 93.0% 7.0% 1

Packages

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

org.apache.commons.logging

Afferent Couplings Efferent Couplings Abstractness Instability Distance
1 7 20.0% 88.0% 8.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
org.apache.commons.logging.Log
org.apache.commons.logging.LogFactory
org.apache.commons.logging.LogConfigurationException
org.apache.commons.logging.LogFactory$1
org.apache.commons.logging.LogFactory$2
org.apache.commons.logging.LogFactory$3
org.apache.commons.logging.LogFactory$4
org.apache.commons.logging.LogFactory$5
org.apache.commons.logging.LogFactory$6
org.apache.commons.logging.LogSource
org.apache.commons.logging.impl
java.io
java.lang
java.lang.reflect
java.net
java.security
java.util
org.apache.commons.logging.impl

org.apache.commons.logging.impl

Afferent Couplings Efferent Couplings Abstractness Instability Distance
1 13 0.0% 93.0% 7.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
None org.apache.commons.logging.impl.AvalonLogger
org.apache.commons.logging.impl.Jdk13LumberjackLogger
org.apache.commons.logging.impl.Jdk14Logger
org.apache.commons.logging.impl.Log4JLogger
org.apache.commons.logging.impl.LogFactoryImpl
org.apache.commons.logging.impl.LogFactoryImpl$1
org.apache.commons.logging.impl.LogFactoryImpl$2
org.apache.commons.logging.impl.LogFactoryImpl$3
org.apache.commons.logging.impl.LogKitLogger
org.apache.commons.logging.impl.NoOpLog
org.apache.commons.logging.impl.ServletContextCleaner
org.apache.commons.logging.impl.SimpleLog
org.apache.commons.logging.impl.SimpleLog$1
org.apache.commons.logging.impl.WeakHashtable
org.apache.commons.logging.impl.WeakHashtable$1
org.apache.commons.logging.impl.WeakHashtable$Entry
org.apache.commons.logging.impl.WeakHashtable$Referenced
org.apache.commons.logging.impl.WeakHashtable$WeakKey
org.apache.commons.logging
java.io
java.lang
java.lang.ref
java.lang.reflect
java.security
java.text
java.util
java.util.logging
javax.servlet
org.apache.avalon.framework.logger
org.apache.commons.logging
org.apache.log
org.apache.log4j

Cycles

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

Package Package Dependencies
org.apache.commons.logging org.apache.commons.logging.impl
org.apache.commons.logging
org.apache.commons.logging.impl org.apache.commons.logging
org.apache.commons.logging.impl

Explanation

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

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

Term Description
Number of Classes The number of concrete and abstract classes (and interfaces) in the package is an indicator of the extensibility of the package.
Afferent Couplings The number of other packages that depend upon classes within the package is an indicator of the package's responsibility.
Efferent Couplings The number of other packages that the classes in the package depend upon is an indicator of the package's independence.
Abstractness The 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.
Instability The 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.
Distance The 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.
Cycles Packages 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.