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Merge pull request #30066: [flink] Fix watermark generation for empty…
… UnboundedSource
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101 changes: 101 additions & 0 deletions
101
...che/beam/runners/flink/translation/wrappers/streaming/io/source/EmptyUnboundedSource.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /* | ||
| * 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.runners.flink.translation.wrappers.streaming.io.source; | ||
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|
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| import java.io.IOException; | ||
| import java.io.Serializable; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.NoSuchElementException; | ||
| import org.apache.beam.sdk.coders.Coder; | ||
| import org.apache.beam.sdk.coders.SerializableCoder; | ||
| import org.apache.beam.sdk.io.UnboundedSource; | ||
| import org.apache.beam.sdk.options.PipelineOptions; | ||
| import org.apache.beam.sdk.transforms.windowing.BoundedWindow; | ||
| import org.checkerframework.checker.nullness.qual.Nullable; | ||
| import org.joda.time.Instant; | ||
|
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| public class EmptyUnboundedSource<T> | ||
| extends UnboundedSource<T, EmptyUnboundedSource.DummyCheckpointMark> { | ||
|
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| Instant watermark = BoundedWindow.TIMESTAMP_MIN_VALUE; | ||
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| public static class DummyCheckpointMark implements UnboundedSource.CheckpointMark, Serializable { | ||
| @Override | ||
| public void finalizeCheckpoint() {} | ||
| } | ||
|
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| @Override | ||
| public List<? extends EmptyUnboundedSource<T>> split( | ||
| int desiredNumSplits, PipelineOptions options) throws Exception { | ||
| return Collections.singletonList(this); | ||
| } | ||
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| @Override | ||
| public UnboundedReader<T> createReader( | ||
| PipelineOptions options, @Nullable DummyCheckpointMark checkpointMark) throws IOException { | ||
| return new UnboundedReader<T>() { | ||
| @Override | ||
| public boolean start() throws IOException { | ||
| return advance(); | ||
| } | ||
|
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| @Override | ||
| public boolean advance() throws IOException { | ||
| return false; | ||
| } | ||
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| @Override | ||
| public Instant getWatermark() { | ||
| return watermark; | ||
| } | ||
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| @Override | ||
| public CheckpointMark getCheckpointMark() { | ||
| return new DummyCheckpointMark(); | ||
| } | ||
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| @Override | ||
| public UnboundedSource<T, ?> getCurrentSource() { | ||
| return EmptyUnboundedSource.this; | ||
| } | ||
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| @Override | ||
| public T getCurrent() throws NoSuchElementException { | ||
| throw new NoSuchElementException(); | ||
| } | ||
|
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| @Override | ||
| public Instant getCurrentTimestamp() throws NoSuchElementException { | ||
| throw new NoSuchElementException(); | ||
| } | ||
|
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| @Override | ||
| public void close() {} | ||
| }; | ||
| } | ||
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| @Override | ||
| public Coder<DummyCheckpointMark> getCheckpointMarkCoder() { | ||
| return SerializableCoder.of(DummyCheckpointMark.class); | ||
| } | ||
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| public void setWatermark(Instant watermark) { | ||
| this.watermark = watermark; | ||
| } | ||
| } |
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