| /** |
| * 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 org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| |
| /** |
| * Edge defines the connection between a producer and consumer vertex in the DAG. |
| * @link {@link EdgeProperty} defines the relationship between them. The producer |
| * vertex provides input to the edge and the consumer vertex reads output from the |
| * edge. |
| * |
| */ |
| @Public |
| public class Edge { |
| |
| private final Vertex inputVertex; |
| private final Vertex outputVertex; |
| private final EdgeProperty edgeProperty; |
| |
| private Edge(Vertex inputVertex, |
| Vertex outputVertex, |
| EdgeProperty edgeProperty) { |
| this.inputVertex = inputVertex; |
| this.outputVertex = outputVertex; |
| this.edgeProperty = edgeProperty; |
| } |
| |
| |
| |
| /** |
| * Creates an edge between the specified vertices. |
| * |
| * InputVertex(EdgeInput) ----- Edge ----- OutputVertex(EdgeOutput)] |
| * |
| * @param inputVertex the vertex which generates data to the edge. |
| * @param outputVertex the vertex which consumes data from the edge |
| * @param edgeProperty {@link org.apache.tez.dag.api.EdgeProperty} associated with this edge |
| * @return the {@link org.apache.tez.dag.api.Edge} |
| */ |
| public static Edge create(Vertex inputVertex, |
| Vertex outputVertex, |
| EdgeProperty edgeProperty) { |
| return new Edge(inputVertex, outputVertex, edgeProperty); |
| } |
| |
| /** |
| * The @link {@link Vertex} that provides input to the edge |
| * @return {@link Vertex} |
| */ |
| public Vertex getInputVertex() { |
| return inputVertex; |
| } |
| |
| /** |
| * The @link {@link Vertex} that reads output from the edge |
| * @return {@link Vertex} |
| */ |
| public Vertex getOutputVertex() { |
| return outputVertex; |
| } |
| |
| /** |
| * The @link {@link EdgeProperty} for this edge |
| * @return {@link EdgeProperty} |
| */ |
| public EdgeProperty getEdgeProperty() { |
| return edgeProperty; |
| } |
| |
| /* |
| * Used to identify the edge in the configuration |
| */ |
| @Private |
| public String getId() { |
| return String.valueOf(this.hashCode()); |
| } |
| |
| @Override |
| public String toString() { |
| return inputVertex + " -> " + outputVertex + " (" + edgeProperty + ")"; |
| } |
| |
| } |