Triggers builds of other projects.
Despite what the name suggests, this class doesn't actually trigger other jobs as a part of {@link #perform} method. Its main job is to simply augment{@link DependencyGraph}. Jobs are responsible for triggering downstream jobs on its own, because dependencies may come from other sources.
This class, however, does provide the {@link #execute(AbstractBuild,BuildListener,BuildTrigger)}method as a convenience method to invoke downstream builds.
@author Kohsuke Kawaguchi