these are extension points.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@1644 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/listeners/JobListener.java

@@ -2,6 +2,7 @@ package hudson.model.listeners;
 
 import hudson.model.Hudson;
 import hudson.model.Job;
+import hudson.ExtensionPoint;
 
 /**
  * Receives notifications about jobs.
@@ -12,7 +13,7 @@ import hudson.model.Job;
  * @author Kohsuke Kawaguchi
  * @see Hudson#addListener(JobListener)
  */
-public abstract class JobListener {
+public abstract class JobListener implements ExtensionPoint {
     /**
      * Called after a new job is created and added to {@link Hudson}.
      */

core/src/main/java/hudson/model/listeners/SCMListener.java

@@ -6,6 +6,7 @@ import hudson.model.BuildListener;
 import hudson.model.Hudson;
 import hudson.scm.ChangeLogSet;
 import hudson.scm.SCM;
+import hudson.ExtensionPoint;
 
 /**
  * Receives notifications about SCM activities in Hudson.
@@ -20,7 +21,7 @@ import hudson.scm.SCM;
  * @see Hudson#getSCMListeners()
  * @since 1.70
  */
-public abstract class SCMListener {
+public abstract class SCMListener implements ExtensionPoint {
     /**
      * Called once the changelog is determined.
      *