org.apache.flink.streaming.api.transformations.PartitionTransformation Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
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package org.apache.flink.streaming.api.transformations;
import org.apache.flink.annotation.Internal;
import org.apache.flink.streaming.api.operators.ChainingStrategy;
import org.apache.flink.streaming.runtime.partitioner.StreamPartitioner;
import org.apache.flink.shaded.guava18.com.google.common.collect.Lists;
import java.util.Collection;
import java.util.List;
/**
* This transformation represents a change of partitioning of the input elements.
*
* This does not create a physical operation, it only affects how upstream operations are
* connected to downstream operations.
*
* @param The type of the elements that result from this {@code PartitionTransformation}
*/
@Internal
public class PartitionTransformation extends StreamTransformation {
private final StreamTransformation input;
private final StreamPartitioner partitioner;
/**
* Creates a new {@code PartitionTransformation} from the given input and
* {@link StreamPartitioner}.
*
* @param input The input {@code StreamTransformation}
* @param partitioner The {@code StreamPartitioner}
*/
public PartitionTransformation(StreamTransformation input, StreamPartitioner partitioner) {
super("Partition", input.getOutputType(), input.getParallelism());
this.input = input;
this.partitioner = partitioner;
}
/**
* Returns the input {@code StreamTransformation} of this {@code SinkTransformation}.
*/
public StreamTransformation getInput() {
return input;
}
/**
* Returns the {@code StreamPartitioner} that must be used for partitioning the elements
* of the input {@code StreamTransformation}.
*/
public StreamPartitioner getPartitioner() {
return partitioner;
}
@Override
public Collection> getTransitivePredecessors() {
List> result = Lists.newArrayList();
result.add(this);
result.addAll(input.getTransitivePredecessors());
return result;
}
@Override
public final void setChainingStrategy(ChainingStrategy strategy) {
throw new UnsupportedOperationException("Cannot set chaining strategy on Union Transformation.");
}
}