/* * 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.flink.streaming.api.transformations; import org.apache.flink.annotation.Internal; import org.apache.flink.api.dag.Transformation; 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; import static org.apache.flink.util.Preconditions.checkNotNull; /** * This transformation represents a change of partitioning of the input elements. * * <p>This does not create a physical operation, it only affects how upstream operations are * connected to downstream operations. * * @param <T> The type of the elements that result from this {@code PartitionTransformation} */ @Internal public class PartitionTransformation<T> extends Transformation<T> { private final Transformation<T> input; private final StreamPartitioner<T> partitioner; private final ShuffleMode shuffleMode; /** * Creates a new {@code PartitionTransformation} from the given input and * {@link StreamPartitioner}. * * @param input The input {@code Transformation} * @param partitioner The {@code StreamPartitioner} */ public PartitionTransformation(Transformation<T> input, StreamPartitioner<T> partitioner) { this(input, partitioner, ShuffleMode.UNDEFINED); } /** * Creates a new {@code PartitionTransformation} from the given input and * {@link StreamPartitioner}. * * @param input The input {@code Transformation} * @param partitioner The {@code StreamPartitioner} * @param shuffleMode The {@code ShuffleMode} */ public PartitionTransformation( Transformation<T> input, StreamPartitioner<T> partitioner, ShuffleMode shuffleMode) { super("Partition", input.getOutputType(), input.getParallelism()); this.input = input; this.partitioner = partitioner; this.shuffleMode = checkNotNull(shuffleMode); } /** * Returns the input {@code Transformation} of this {@code SinkTransformation}. */ public Transformation<T> getInput() { return input; } /** * Returns the {@code StreamPartitioner} that must be used for partitioning the elements * of the input {@code Transformation}. */ public StreamPartitioner<T> getPartitioner() { return partitioner; } /** * Returns the {@link ShuffleMode} of this {@link PartitionTransformation}. */ public ShuffleMode getShuffleMode() { return shuffleMode; } @Override public Collection<Transformation<?>> getTransitivePredecessors() { List<Transformation<?>> result = Lists.newArrayList(); result.add(this); result.addAll(input.getTransitivePredecessors()); return result; } }