aromanenko-dev commented on code in PR #17828: URL: https://github.com/apache/beam/pull/17828#discussion_r949194118
########## sdks/java/io/sparkreceiver/src/main/java/org/apache/beam/sdk/io/sparkreceiver/ReadFromSparkReceiverWithOffsetDoFn.java: ########## @@ -0,0 +1,224 @@ +/* + * 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.beam.sdk.io.sparkreceiver; + +import static org.apache.beam.sdk.util.Preconditions.checkStateNotNull; + +import java.util.Queue; +import java.util.concurrent.ConcurrentLinkedQueue; +import java.util.concurrent.TimeUnit; +import org.apache.beam.sdk.coders.Coder; +import org.apache.beam.sdk.io.range.OffsetRange; +import org.apache.beam.sdk.transforms.DoFn; +import org.apache.beam.sdk.transforms.DoFn.UnboundedPerElement; +import org.apache.beam.sdk.transforms.SerializableFunction; +import org.apache.beam.sdk.transforms.splittabledofn.ManualWatermarkEstimator; +import org.apache.beam.sdk.transforms.splittabledofn.OffsetRangeTracker; +import org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker; +import org.apache.beam.sdk.transforms.splittabledofn.WatermarkEstimator; +import org.apache.beam.sdk.transforms.splittabledofn.WatermarkEstimators; +import org.apache.beam.sdk.transforms.windowing.BoundedWindow; +import org.apache.spark.SparkConf; +import org.apache.spark.streaming.receiver.Receiver; +import org.checkerframework.checker.nullness.qual.Nullable; +import org.joda.time.Instant; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * A SplittableDoFn which reads from {@link Receiver} that implements {@link HasOffset}. By default, + * a {@link WatermarkEstimators.Manual} watermark estimator is used to track watermark. + * + * <p>Initial range The initial range is {@code [0, Long.MAX_VALUE)} + * + * <p>Resume Processing Every time the sparkConsumer.hasRecords() returns false, {@link + * ReadFromSparkReceiverWithOffsetDoFn} will move to process the next element. + */ +@UnboundedPerElement +public class ReadFromSparkReceiverWithOffsetDoFn<V> extends DoFn<byte[], V> { + + private static final Logger LOG = + LoggerFactory.getLogger(ReadFromSparkReceiverWithOffsetDoFn.class); + + /** Constant waiting time after the {@link Receiver} starts. Required to prepare for polling */ + private static final int START_POLL_TIMEOUT_MS = 1000; + + private final SerializableFunction<Instant, WatermarkEstimator<Instant>> + createWatermarkEstimatorFn; + private final SerializableFunction<V, Long> getOffsetFn; + private final SerializableFunction<V, Instant> getWatermarkFn; + private final ReceiverBuilder<V, ? extends Receiver<V>> sparkReceiverBuilder; + + public ReadFromSparkReceiverWithOffsetDoFn(SparkReceiverIO.Read<V> transform) { + createWatermarkEstimatorFn = WatermarkEstimators.Manual::new; + + ReceiverBuilder<V, ? extends Receiver<V>> sparkReceiverBuilder = + transform.getSparkReceiverBuilder(); + checkStateNotNull(sparkReceiverBuilder, "Spark Receiver Builder can't be null!"); + this.sparkReceiverBuilder = sparkReceiverBuilder; + + SerializableFunction<V, Long> getOffsetFn = transform.getGetOffsetFn(); + checkStateNotNull(getOffsetFn, "Get offset fn can't be null!"); + this.getOffsetFn = getOffsetFn; + + SerializableFunction<V, Instant> getWatermarkFn = transform.getWatermarkFn(); + checkStateNotNull(getWatermarkFn, "Watermark fn can't be null!"); + this.getWatermarkFn = getWatermarkFn; + } + + @GetInitialRestriction + public OffsetRange initialRestriction(@Element byte[] element) { + return new OffsetRange(0, Long.MAX_VALUE); + } + + @GetInitialWatermarkEstimatorState + public Instant getInitialWatermarkEstimatorState(@Timestamp Instant currentElementTimestamp) { + return currentElementTimestamp; + } + + @NewWatermarkEstimator + public WatermarkEstimator<Instant> newWatermarkEstimator( + @WatermarkEstimatorState Instant watermarkEstimatorState) { + return createWatermarkEstimatorFn.apply(ensureTimestampWithinBounds(watermarkEstimatorState)); + } + + @GetSize + public double getSize(@Element byte[] element, @Restriction OffsetRange offsetRange) { + return restrictionTracker(element, offsetRange).getProgress().getWorkRemaining(); + // Before processing elements, we don't have a good estimated size of records and offset gap. + } + + @NewTracker + public OffsetRangeTracker restrictionTracker( + @Element byte[] element, @Restriction OffsetRange restriction) { + return new OffsetRangeTracker(restriction); + } + + @GetRestrictionCoder + public Coder<OffsetRange> restrictionCoder() { + return new OffsetRange.Coder(); + } + + @Setup + public void setup() throws Exception {} + + @Teardown + public void teardown() throws Exception {} + + @SuppressWarnings("unchecked") Review Comment: Yes, please. -- This is an automated message from the Apache Git Service. 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