Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/11006#discussion_r51505200 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamProgress.scala --- @@ -0,0 +1,71 @@ +/* + * 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.execution.streaming + +import scala.collection.mutable + +/** + * A helper class that looks like a Map[Source, Offset]. + */ +class StreamProgress extends Serializable { + private val currentOffsets = new mutable.HashMap[Source, Offset] + with mutable.SynchronizedMap[Source, Offset] + + private[streaming] def update(source: Source, newOffset: Offset): Unit = { + currentOffsets.get(source).foreach(old => + assert(newOffset > old, s"Stream going backwards $newOffset -> $old")) + currentOffsets.put(source, newOffset) + } + + private[streaming] def update(newOffset: (Source, Offset)): Unit = + update(newOffset._1, newOffset._2) + + private[streaming] def apply(source: Source): Offset = currentOffsets(source) + private[streaming] def get(source: Source): Option[Offset] = currentOffsets.get(source) + private[streaming] def contains(source: Source): Boolean = currentOffsets.contains(source) + + private[streaming] def ++(updates: Map[Source, Offset]): StreamProgress = { + val updated = new StreamProgress + currentOffsets.foreach(updated.update) + updates.foreach(updated.update) + updated + } + + /** + * Used to create a new copy of this [[StreamProgress]]. While this class is currently mutable, + * it should be copied before being passed to user code. + */ + private[streaming] def copy(): StreamProgress = { + val copied = new StreamProgress + currentOffsets.foreach(copied.update) + copied + } + + override def toString: String = + currentOffsets.map { case (k, v) => s"$k: $v"}.mkString("{", ",", "}") + + override def equals(other: Any): Boolean = other match { + case s: StreamProgress => + s.currentOffsets.keys.toSet == currentOffsets.keys.toSet && --- End diff -- > Both LongOffset and CompositeOffset are case classes, so I think that the default implementation of hashCode and equals are actually okay. Sorry, didn't notice that. However, you can use `currentOffsets`'s `hashCode` and `equals` directly and not need to implement it again. Right?
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