org.apache.flink.streaming.runtime.translators.SourceTransformationTranslator Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.flink.streaming.runtime.translators;
import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.ExecutionConfig;
import org.apache.flink.api.connector.source.SourceSplit;
import org.apache.flink.streaming.api.graph.SimpleTransformationTranslator;
import org.apache.flink.streaming.api.graph.StreamGraph;
import org.apache.flink.streaming.api.graph.TransformationTranslator;
import org.apache.flink.streaming.api.operators.SourceOperatorFactory;
import org.apache.flink.streaming.api.transformations.SourceTransformation;
import java.util.Collection;
import java.util.Collections;
import static org.apache.flink.util.Preconditions.checkNotNull;
/**
* A {@link TransformationTranslator} for the {@link SourceTransformation}.
*
* @param The type of the elements that this source produces.
*/
@Internal
public class SourceTransformationTranslator
extends SimpleTransformationTranslator> {
@Override
protected Collection translateForBatchInternal(
final SourceTransformation transformation,
final Context context) {
return translateInternal(
transformation, context, false /* don't emit progressive watermarks */);
}
@Override
protected Collection translateForStreamingInternal(
final SourceTransformation transformation,
final Context context) {
return translateInternal(transformation, context, true /* emit progressive watermarks */);
}
private Collection translateInternal(
final SourceTransformation transformation,
final Context context,
boolean emitProgressiveWatermarks) {
checkNotNull(transformation);
checkNotNull(context);
final StreamGraph streamGraph = context.getStreamGraph();
final String slotSharingGroup = context.getSlotSharingGroup();
final int transformationId = transformation.getId();
final ExecutionConfig executionConfig = streamGraph.getExecutionConfig();
SourceOperatorFactory operatorFactory =
new SourceOperatorFactory<>(
transformation.getSource(),
transformation.getWatermarkStrategy(),
emitProgressiveWatermarks);
operatorFactory.setChainingStrategy(transformation.getChainingStrategy());
streamGraph.addSource(
transformationId,
slotSharingGroup,
transformation.getCoLocationGroupKey(),
operatorFactory,
null,
transformation.getOutputType(),
"Source: " + transformation.getName());
final int parallelism =
transformation.getParallelism() != ExecutionConfig.PARALLELISM_DEFAULT
? transformation.getParallelism()
: executionConfig.getParallelism();
streamGraph.setParallelism(transformationId, parallelism);
streamGraph.setMaxParallelism(transformationId, transformation.getMaxParallelism());
return Collections.singleton(transformationId);
}
}