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 package org.apache.giraph.worker; 19 20 /** 21 * Interface providing utilities for using worker index. 22 * 23 * @param <I> Vertex id type 24 */ 25 public interface WorkerIndexUsage<I> { 26 /** 27 * Get number of workers 28 * 29 * @return Number of workers 30 */ 31 int getWorkerCount(); 32 33 /** 34 * Get index for this worker 35 * 36 * @return Index of this worker 37 */ 38 int getMyWorkerIndex(); 39 40 /** 41 * Get worker index which will contain vertex with given id, 42 * if such vertex exists. 43 * 44 * @param vertexId vertex id 45 * @return worker index 46 */ 47 int getWorkerForVertex(I vertexId); 48 }