Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/11030#discussion_r52371427
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/util/ContinuousQueryListener.scala
---
@@ -0,0 +1,67 @@
+/*
+ * 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.sql.util
+
+import org.apache.spark.annotation.Experimental
+import org.apache.spark.sql.ContinuousQuery
+import org.apache.spark.sql.util.ContinuousQueryListener._
+
+/**
+ * :: Experimental ::
+ * Interface for listening to events related to [[ContinuousQuery
ContinuousQueries]].
+ * @note The methods are not thread-safe as they may be called from
different threads.
+ */
+@Experimental
+abstract class ContinuousQueryListener {
+
+ /**
+ * Called when a query is started.
+ * @note This is called synchronously with
+ * [[org.apache.spark.sql.DataFrameWriter
`DataFrameWriter.stream()`]],
+ * that is, `onQueryStart` will be called on all listeners before
`DataFrameWriter.stream()`
+ * returns the corresponding [[ContinuousQuery]].
+ */
+ def onQueryStarted(queryStarted: QueryStarted)
+
+ /** Called when there is some status update (ingestion rate updated,
etc. */
+ def onQueryProgress(queryProgress: QueryProgress)
+
+ /** Called when a query is stopped, with or without error */
+ def onQueryTerminated(queryTerminated: QueryTerminated)
+}
+
+
+/**
+ * :: Experimental ::
+ * Companion object of [[ContinuousQueryListener]] that defines the
listener events.
+ */
+@Experimental
+object ContinuousQueryListener {
+
+ /** Base type of [[ContinuousQueryListener]] events */
--- End diff --
nit: extra space
---
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