| /** |
| * 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.tez.dag.api; |
| |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| |
| import com.google.common.collect.Maps; |
| import com.google.common.collect.Sets; |
| |
| /** |
| * Represents a virtual collection of vertices whose members can be treated as a single |
| * named collection for graph operations. Only the following connections are valid. |
| * A VertexGroup can be connected as an input to a consumer Vertex. The tasks of |
| * the destination vertex see a single input named after the VertexGroup instead |
| * multiple inputs from the members of the VertexGroup. |
| * An output can be added to a VertexGroup. |
| * All outgoing edges & outputs of a VertexGroup are automatically transferred to the |
| * member vertices of the VertexGroup. |
| * A VertexGroup is not part of the final DAG. |
| */ |
| @Public |
| public class VertexGroup { |
| |
| static class GroupInfo { |
| String groupName; |
| Set<Vertex> members = new HashSet<Vertex>(); |
| Set<String> outputs = new HashSet<String>(); |
| // destination vertex name to merged input map |
| Map<String, InputDescriptor> edgeMergedInputs = Maps.newHashMap(); |
| |
| GroupInfo(String groupName, Vertex... vertices) { |
| this.groupName = groupName; |
| members = Sets.newHashSetWithExpectedSize(vertices.length); |
| for (Vertex v : vertices) { |
| members.add(v); |
| } |
| } |
| String getGroupName() { |
| return groupName; |
| } |
| Set<Vertex> getMembers() { |
| return members; |
| } |
| Set<String> getOutputs() { |
| return outputs; |
| } |
| } |
| |
| GroupInfo groupInfo; |
| |
| /** |
| * Create an object representing a group of vertices |
| * @param groupName name of the group |
| */ |
| VertexGroup(String groupName, Vertex... members) { |
| if (members == null || members.length < 2) { |
| throw new IllegalArgumentException("VertexGroup must have at least 2 members"); |
| } |
| this.groupInfo = new GroupInfo(groupName, members); |
| } |
| |
| /** |
| * Get the name of the group |
| * @return name |
| */ |
| public String getGroupName() { |
| return groupInfo.groupName; |
| } |
| |
| /** |
| * Add an common data sink to the group of vertices. |
| * Refer to {@link Vertex#addDataSink(String, DataSinkDescriptor)} |
| * @return this object for further chained method calls |
| */ |
| public VertexGroup addDataSink(String outputName, DataSinkDescriptor dataSinkDescriptor) { |
| RootInputLeafOutput<OutputDescriptor, OutputCommitterDescriptor> leafOutput = |
| new RootInputLeafOutput<OutputDescriptor, OutputCommitterDescriptor>(outputName, |
| dataSinkDescriptor.getOutputDescriptor(), dataSinkDescriptor.getOutputCommitterDescriptor()); |
| this.groupInfo.outputs.add(outputName); |
| |
| // also add output to its members |
| for (Vertex member : getMembers()) { |
| member.addAdditionalDataSink(leafOutput); |
| } |
| |
| return this; |
| } |
| |
| @Override |
| public String toString() { |
| return "[ VertexGroup: " + groupInfo.getGroupName() + "]" + ", members=" + groupInfo.members; |
| } |
| |
| GroupInfo getGroupInfo() { |
| return groupInfo; |
| } |
| |
| Set<Vertex> getMembers() { |
| return groupInfo.members; |
| } |
| |
| void addOutputVertex(Vertex outputVertex, GroupInputEdge edge) { |
| this.groupInfo.edgeMergedInputs.put(outputVertex.getName(), edge.getMergedInput()); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result |
| + ((groupInfo.groupName == null) ? 0 : groupInfo.groupName.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| VertexGroup other = (VertexGroup) obj; |
| if (groupInfo.groupName == null) { |
| if (other.groupInfo.groupName != null) |
| return false; |
| } else if (!groupInfo.groupName.equals(other.groupInfo.groupName)) |
| return false; |
| |
| return true; |
| } |
| } |