| /* |
| * 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.giraph.graph.partition; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.giraph.graph.WorkerInfo; |
| |
| /** |
| * Describes what is required to send and wait for in a potential partition |
| * exchange between workers. |
| */ |
| public class PartitionExchange { |
| /** Workers that I am dependent on before I can continue */ |
| private final Set<WorkerInfo> myDependencyWorkerSet; |
| /** Workers that I need to sent partitions to */ |
| private final Map<WorkerInfo, List<Integer>> sendWorkerPartitionMap; |
| |
| /** |
| * Only constructor. |
| * |
| * @param myDependencyWorkerSet All the workers I must wait for |
| * @param sendWorkerPartitionMap Partitions I need to send to other workers |
| */ |
| public PartitionExchange( |
| Set<WorkerInfo> myDependencyWorkerSet, |
| Map<WorkerInfo, List<Integer>> sendWorkerPartitionMap) { |
| this.myDependencyWorkerSet = myDependencyWorkerSet; |
| this.sendWorkerPartitionMap = sendWorkerPartitionMap; |
| } |
| |
| /** |
| * Get the workers that I must wait for |
| * |
| * @return Set of workers I must wait for |
| */ |
| public Set<WorkerInfo> getMyDependencyWorkerSet() { |
| return myDependencyWorkerSet; |
| } |
| |
| /** |
| * Get a mapping of worker to list of partition ids I need to send to. |
| * |
| * @return Mapping of worker to partition id list I will send to. |
| */ |
| public Map<WorkerInfo, List<Integer>> getSendWorkerPartitionMap() { |
| return sendWorkerPartitionMap; |
| } |
| |
| /** |
| * Is this worker involved in a partition exchange? Receiving or sending? |
| * |
| * @return True if needs to be involved in the exchange, false otherwise. |
| */ |
| public boolean doExchange() { |
| return !myDependencyWorkerSet.isEmpty() || |
| !sendWorkerPartitionMap.isEmpty(); |
| } |
| } |