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.utils; 20 21 import org.apache.hadoop.io.Writable; 22 import org.apache.hadoop.io.WritableComparable; 23 24 /** 25 * VertexIdMessages 26 * 27 * @param <I> vertexId type parameter 28 * @param <M> message type parameter 29 */ 30 public interface VertexIdMessages<I extends WritableComparable, 31 M extends Writable> extends VertexIdData<I, M> { 32 /** 33 * Get specialized iterator that will instantiate the vertex id and 34 * message of this object. It will only produce message bytes, not actual 35 * messages and expects a different encoding. 36 * 37 * @return Special iterator that reuses vertex ids (unless released) and 38 * copies message bytes 39 */ 40 VertexIdMessageBytesIterator<I, M> getVertexIdMessageBytesIterator(); 41 42 /** 43 * Get specialized iterator that will instiantiate the vertex id and 44 * message of this object. 45 * 46 * @return Special iterator that reuses vertex ids and messages unless 47 * specified 48 */ 49 VertexIdMessageIterator<I, M> getVertexIdMessageIterator(); 50 }