1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.edge; 20 21 import org.apache.hadoop.io.Writable; 22 import org.apache.hadoop.io.WritableComparable; 23 24 /** 25 * A complete edge, the target vertex and the edge value. Can only be one 26 * edge with a destination vertex id per edge map. This edge can be reused, 27 * that is you can set it's target vertex ID and edge value. 28 * Note: this class is useful for certain optimizations, 29 * but it's not meant to be exposed to the user. Look at {@link MutableEdge} 30 * instead. 31 * 32 * @param <I> Vertex index 33 * @param <E> Edge value 34 */ 35 public interface ReusableEdge<I extends WritableComparable, E extends Writable> 36 extends MutableEdge<I, E> { 37 /** 38 * Set the destination vertex index of this edge. 39 * 40 * @param targetVertexId new destination vertex 41 */ 42 void setTargetVertexId(I targetVertexId); 43 }