Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/9420#discussion_r44334549
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaStreamingListener.scala
---
@@ -0,0 +1,189 @@
+/*
+ * 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.streaming.api.java
+
+import org.apache.spark.annotation.DeveloperApi
+import org.apache.spark.streaming.Time
+import org.apache.spark.streaming.scheduler._
+
+/**
+ * A listener interface for receiving information about an ongoing
streaming computation.
+ */
+@DeveloperApi
+abstract class JavaStreamingListener {
+
+ /** Called when a receiver has been started */
+ def onReceiverStarted(receiverStarted:
JavaStreamingListenerReceiverStarted): Unit = { }
+
+ /** Called when a receiver has reported an error */
+ def onReceiverError(receiverError: JavaStreamingListenerReceiverError):
Unit = { }
+
+ /** Called when a receiver has been stopped */
+ def onReceiverStopped(receiverStopped:
JavaStreamingListenerReceiverStopped): Unit = { }
+
+ /** Called when a batch of jobs has been submitted for processing. */
+ def onBatchSubmitted(batchSubmitted:
JavaStreamingListenerBatchSubmitted): Unit = { }
+
+ /** Called when processing of a batch of jobs has started. */
+ def onBatchStarted(batchStarted: JavaStreamingListenerBatchStarted):
Unit = { }
+
+ /** Called when processing of a batch of jobs has completed. */
+ def onBatchCompleted(batchCompleted:
JavaStreamingListenerBatchCompleted): Unit = { }
+
+ /** Called when processing of a job of a batch has started. */
+ def onOutputOperationStarted(
+ outputOperationStarted:
JavaStreamingListenerOutputOperationStarted): Unit = { }
+
+ /** Called when processing of a job of a batch has completed. */
+ def onOutputOperationCompleted(
+ outputOperationCompleted:
JavaStreamingListenerOutputOperationCompleted): Unit = { }
+}
+
+/**
+ * :: DeveloperApi ::
+ * Base trait for events related to JavaStreamingListener
+ */
+@DeveloperApi
+sealed trait JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerBatchSubmitted(val batchInfo: JavaBatchInfo)
+ extends JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerBatchCompleted(val batchInfo: JavaBatchInfo)
+ extends JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerBatchStarted(val batchInfo: JavaBatchInfo)
+ extends JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerOutputOperationStarted(val outputOperationInfo:
JavaOutputOperationInfo)
+ extends JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerOutputOperationCompleted(
+ val outputOperationInfo: JavaOutputOperationInfo) extends
JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerReceiverStarted(val receiverInfo:
JavaReceiverInfo)
+ extends JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerReceiverError(val receiverInfo:
JavaReceiverInfo)
+ extends JavaStreamingListenerEvent
+
+@DeveloperApi
+class JavaStreamingListenerReceiverStopped(val receiverInfo:
JavaReceiverInfo)
--- End diff --
`JavaSparkListener` is not java friendly. So I don't follow it. IMO, we
should not use any Scala classes in the public Java API.
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