| /* |
| * 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.nemo.common.ir.vertex.utility.runtimepass; |
| |
| import org.apache.nemo.common.Pair; |
| import org.apache.nemo.common.ir.IdManager; |
| import org.apache.nemo.common.ir.vertex.OperatorVertex; |
| import org.apache.nemo.common.ir.vertex.executionproperty.MessageIdVertexProperty; |
| import org.apache.nemo.common.ir.vertex.executionproperty.ParallelismProperty; |
| import org.apache.nemo.common.ir.vertex.transform.MessageAggregatorTransform; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.Serializable; |
| import java.util.function.BiFunction; |
| import java.util.function.Supplier; |
| |
| /** |
| * Aggregates upstream messages. |
| * |
| * @param <K> of the input pair. |
| * @param <V> of the input pair. |
| * @param <O> of the output aggregated message. |
| */ |
| public final class MessageAggregatorVertex<K, V, O> extends OperatorVertex { |
| private static final Logger LOG = LoggerFactory.getLogger(MessageAggregatorVertex.class.getName()); |
| |
| /** |
| * @param initialStateSupplier for producing the initial state. |
| * @param userFunction for aggregating the messages. |
| */ |
| public MessageAggregatorVertex(final InitialStateSupplier<O> initialStateSupplier, |
| final MessageAggregatorFunction<K, V, O> userFunction) { |
| super(new MessageAggregatorTransform<>(initialStateSupplier, userFunction)); |
| this.setPropertyPermanently(MessageIdVertexProperty.of(IdManager.generateMessageId())); |
| this.setProperty(ParallelismProperty.of(1)); |
| } |
| |
| /** |
| * Creates the initial aggregated message. |
| * @param <O> of the output aggregated message. |
| */ |
| public interface InitialStateSupplier<O> extends Supplier<O>, Serializable { |
| } |
| |
| /** |
| * Aggregates incoming messages. |
| * @param <K> of the input pair. |
| * @param <V> of the input pair. |
| * @param <O> of the output aggregated message. |
| */ |
| public interface MessageAggregatorFunction<K, V, O> extends BiFunction<Pair<K, V>, O, O>, Serializable { |
| } |
| } |