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.performance 5 3 2 3 8 40.0% 73.0% 13.0% 1
org.apache.commons.performance.dbcp 3 3 0 0 10 0.0% 100.0% 0.0% 1
org.apache.commons.performance.http 3 3 0 0 7 0.0% 100.0% 0.0% 1
org.apache.commons.performance.pool 5 5 0 0 11 0.0% 100.0% 0.0% 1

Packages

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

org.apache.commons.performance

Afferent Couplings Efferent Couplings Abstractness Instability Distance
3 8 40.0% 73.0% 13.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
org.apache.commons.performance.ClientThread
org.apache.commons.performance.LoadGenerator
org.apache.commons.performance.ConfigurationException
org.apache.commons.performance.Statistics
org.apache.commons.performance.Statistics$StatisticsKey
org.apache.commons.performance.dbcp
org.apache.commons.performance.http
org.apache.commons.performance.pool
java.io
java.lang
java.util
java.util.concurrent
java.util.logging
org.apache.commons.digester
org.apache.commons.math.random
org.apache.commons.math.stat.descriptive

org.apache.commons.performance.dbcp

Afferent Couplings Efferent Couplings Abstractness Instability Distance
0 10 0.0% 100.0% 0.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
None org.apache.commons.performance.dbcp.DBCPClientThread
org.apache.commons.performance.dbcp.DBCPSoak
org.apache.commons.performance.dbcp.DBCPTest
None java.lang
java.sql
java.util
java.util.logging
javax.sql
org.apache.commons.dbcp
org.apache.commons.digester
org.apache.commons.math.random
org.apache.commons.performance
org.apache.commons.pool.impl

org.apache.commons.performance.http

Afferent Couplings Efferent Couplings Abstractness Instability Distance
0 7 0.0% 100.0% 0.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
None org.apache.commons.performance.http.HttpClientThread
org.apache.commons.performance.http.HttpSoak
org.apache.commons.performance.http.HttpTest
None java.lang
java.util.logging
org.apache.commons.digester
org.apache.commons.httpclient
org.apache.commons.httpclient.methods
org.apache.commons.httpclient.params
org.apache.commons.performance

org.apache.commons.performance.pool

Afferent Couplings Efferent Couplings Abstractness Instability Distance
0 11 0.0% 100.0% 0.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
None org.apache.commons.performance.pool.PoolClientThread
org.apache.commons.performance.pool.PoolSoak
org.apache.commons.performance.pool.PoolTest
org.apache.commons.performance.pool.Waiter
org.apache.commons.performance.pool.WaiterFactory
None java.lang
java.util
java.util.concurrent.atomic
java.util.logging
org.apache.commons.dbcp
org.apache.commons.digester
org.apache.commons.math.random
org.apache.commons.math.stat.descriptive
org.apache.commons.performance
org.apache.commons.pool
org.apache.commons.pool.impl

Cycles

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

There are no cyclic dependencies.

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.