Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4210#discussion_r23587232
--- Diff: core/src/main/java/org/apache/spark/SparkFirehoseListener.java ---
@@ -0,0 +1,114 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark;
+
+import org.apache.spark.scheduler.*;
+
+/**
+ * Class that allows users to receive all SparkListener events.
+ * Users should override the onEvent method.
+ *
+ * This is a concrete class instead of abstract to enforce
+ * new events get added to both the SparkListener and this adapter
+ * in lockstep.
+ */
+public class SparkFirehoseListener implements SparkListener {
+
+ public void onEvent(SparkListenerEvent event) { }
--- End diff --
is there a use case for having a noop onEvent?
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