org.apache.flink.streaming.api.transformations.SplitTransformation Maven / Gradle / Ivy
/*
* 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.streaming.api.collector.selector.OutputSelector;
import org.apache.flink.streaming.api.operators.ChainingStrategy;
import org.apache.flink.shaded.guava18.com.google.common.collect.Lists;
import java.util.Collection;
import java.util.List;
/**
* This transformation represents a split of one
* {@link org.apache.flink.streaming.api.datastream.DataStream} into several {@code DataStreams}
* using an {@link org.apache.flink.streaming.api.collector.selector.OutputSelector}.
*
* 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 SplitTransformation}
*/
@Internal
public class SplitTransformation extends StreamTransformation {
private final StreamTransformation input;
private final OutputSelector outputSelector;
/**
* Creates a new {@code SplitTransformation} from the given input and {@code OutputSelector}.
*
* @param input The input {@code StreamTransformation}
* @param outputSelector The output selector
*/
public SplitTransformation(StreamTransformation input,
OutputSelector outputSelector) {
super("Split", input.getOutputType(), input.getParallelism());
this.input = input;
this.outputSelector = outputSelector;
}
/**
* Returns the input {@code StreamTransformation}.
*/
public StreamTransformation getInput() {
return input;
}
/**
* Returns the {@code OutputSelector}.
*/
public OutputSelector getOutputSelector() {
return outputSelector;
}
@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 Split Transformation.");
}
}