Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/18029#discussion_r158627744
--- Diff:
external/kinesis-asl/src/main/java/org/apache/spark/streaming/kinesis/KinesisInitialPositions.java
---
@@ -0,0 +1,91 @@
+/*
+ * 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.kinesis;
+
+import
com.amazonaws.services.kinesis.clientlibrary.lib.worker.InitialPositionInStream;
+
+import java.io.Serializable;
+import java.util.Date;
+
+/**
+ * A java wrapper for exposing [[InitialPositionInStream]]
+ * to the corresponding Kinesis readers.
+ */
+interface KinesisInitialPosition {
+ InitialPositionInStream getPosition();
+}
+
+public class KinesisInitialPositions {
+ public static class Latest implements KinesisInitialPosition,
Serializable {
+ public Latest() {}
+
+ @Override
+ public InitialPositionInStream getPosition() {
+ return InitialPositionInStream.LATEST;
+ }
+ }
+
+ public static class TrimHorizon implements KinesisInitialPosition,
Serializable {
+ public TrimHorizon() {}
+
+ @Override
+ public InitialPositionInStream getPosition() {
+ return InitialPositionInStream.TRIM_HORIZON;
+ }
+ }
+
+ public static class AtTimestamp implements KinesisInitialPosition,
Serializable {
+ private Date timestamp;
+
+ public AtTimestamp(Date timestamp) {
+ this.timestamp = timestamp;
+ }
+
+ @Override
+ public InitialPositionInStream getPosition() {
+ return InitialPositionInStream.AT_TIMESTAMP;
+ }
+
+ public Date getTimestamp() {
+ return timestamp;
+ }
+ }
+
+
+ /**
+ * Returns instance of [[KinesisInitialPosition]] based on the passed
[[InitialPositionInStream]].
+ * This method is used in KinesisUtils for translating the
InitialPositionInStream
+ * to InitialPosition. This function would be removed when we
deprecate the KinesisUtils.
+ *
+ * @return [[InitialPosition]]
+ */
+ public static KinesisInitialPosition fromKinesisInitialPosition(
+ InitialPositionInStream initialPositionInStream) throws
UnsupportedOperationException {
+ if (initialPositionInStream == InitialPositionInStream.LATEST) {
+ return new Latest();
+ } else if (initialPositionInStream ==
InitialPositionInStream.TRIM_HORIZON) {
+ return new TrimHorizon();
+ } else {
+ // InitialPositionInStream.AT_TIMESTAMP is not supported.
+ // Use InitialPosition.atTimestamp(timestamp) instead.
+ throw new UnsupportedOperationException(
+ "Only InitialPositionInStream.LATEST and
InitialPositionInStream.TRIM_HORIZON " +
+ "supported in initialPositionInStream().
Please use the initialPosition() from " +
+ "builder API in KinesisInputDStream for using
InitialPositionInStream.AT_TIMESTAMP");
+ }
+ }
+}
--- End diff --
nit: new line
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