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/*
* 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.runtime.operators.shipping;
import org.apache.flink.api.common.distributions.DataDistribution;
import org.apache.flink.api.common.functions.Partitioner;
import org.apache.flink.api.common.typeutils.TypeComparator;
import org.apache.flink.runtime.io.network.api.writer.ChannelSelector;
import org.apache.flink.runtime.plugable.SerializationDelegate;
import org.apache.flink.util.MathUtils;
/**
* The output emitter decides to which of the possibly multiple output channels a record is sent.
* It implement routing based on hash-partitioning, broadcasting, round-robin, custom partition
* functions, etc.
*
* @param The type of the element handled by the emitter.
*/
public class OutputEmitter implements ChannelSelector> {
/** the shipping strategy used by this output emitter */
private final ShipStrategyType strategy;
/** counter to go over channels round robin */
private int nextChannelToSendTo;
/** the total number of output channels */
private int numberOfChannels;
/** the comparator for hashing / sorting */
private final TypeComparator comparator;
private Object[][] partitionBoundaries; // the partition boundaries for range partitioning
private DataDistribution distribution; // the data distribution to create the partition boundaries for range partitioning
private final Partitioner