The Dependency reduction function computes a single telemetry stream representing dependency information.
Example 28.9. Java Class Dependency using DependencyFinder
streams DependencyStream(metricName, filePattern) = {
"Dependency", JavaDependency(metricName, filePattern)
};
y-axis yAxis(label) = {label};
chart DependencyChart() = {
"Extenal Inbound Dependency",
(DependencyStream("InboundExternal", "**/hackyCore_Kernel/**"), yAxis("External Inbound Dependency"))
};
draw DependencyChart();
This chart shows the number of external inbound dependencies on the hackyCore_Kernel module. The number increased from 2922 to 2966 during the eight weeks covered by this chart, which indicated that more and more Java code in other modules were dependent on the hackyCore_Kernel module.
Example 28.10. Java Class Dependency using JDepend
y-axis yAxis(label) = {label, "integer"};
streams DependencyStream(metricName, filePattern) = {
"Dependency", JavaDependency(metricName, filePattern)
};
chart DependencyWithCycles(filePattern) = {
"Dependency with Cycles",
(DependencyStream("Cycles", filePattern), yAxis("Dependency")),
(DependencyStream("AfferentCouplings", filePattern), yAxis("Dependency")),
(DependencyStream("EfferentCouplings", filePattern), yAxis("Dependency"))
};
draw DependencyChart();
This chart shows the evolution of three dependency measures in a sample project. The data collection was done using JDepend. During the time period from Feb 21 to Feb 27, some refactoring work was done which reduced the cyclic dependencies within the project.