MNG-5389 introduced MavenLifecycleParticipant#afterSessionEnd callback

Signed-off-by: Igor Fedorenko <ifedorenko@apache.org>

maven-core/src/main/java/org/apache/maven/AbstractMavenLifecycleParticipant.java

@@ -57,4 +57,16 @@ public abstract class AbstractMavenLifecycleParticipant
         // do nothing
     }
 
+    /**
+     * Invoked after all projects were built.
+     *
+     * This callback is intended to allow extensions to perform cleanup of any
+     * allocated external resources after the build. It is invoked on best-effort
+     * basis and may be missed due to an Error or RuntimeException in Maven core
+     * code.
+     */
+    public void afterSessionEnd( MavenSession session )
+    {
+        // do nothing
+    }
 }

maven-core/src/main/java/org/apache/maven/DefaultMaven.java

@@ -317,6 +317,8 @@ public class DefaultMaven
 
         if ( result.hasExceptions() )
         {
+            afterSessionEnd( projects, session );
+
             return result;
         }
         
@@ -337,9 +339,29 @@ public class DefaultMaven
             return addExceptionToResult( result, session.getResult().getExceptions().get( 0 ) );
         }
 
+        afterSessionEnd( projects, session );
+
         return result;
     }
 
+    private void afterSessionEnd( Collection<MavenProject> projects, MavenSession session )
+    {
+        ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
+        try
+        {
+            for ( AbstractMavenLifecycleParticipant listener : getLifecycleParticipants( projects ) )
+            {
+                Thread.currentThread().setContextClassLoader( listener.getClass().getClassLoader() );
+
+                listener.afterSessionEnd( session );
+            }
+        }
+        finally
+        {
+            Thread.currentThread().setContextClassLoader( originalClassLoader );
+        }
+    }
+
     public RepositorySystemSession newRepositorySession( MavenExecutionRequest request )
     {
         DefaultRepositorySystemSession session = MavenRepositorySystemUtils.newSession();