| /* |
| * 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.giraph.worker; |
| |
| /** |
| * Interface providing utilities for using worker index. |
| * |
| * @param <I> Vertex id type |
| */ |
| public interface WorkerIndexUsage<I> { |
| /** |
| * Get number of workers |
| * |
| * @return Number of workers |
| */ |
| int getWorkerCount(); |
| |
| /** |
| * Get index for this worker |
| * |
| * @return Index of this worker |
| */ |
| int getMyWorkerIndex(); |
| |
| /** |
| * Get worker index which will contain vertex with given id, |
| * if such vertex exists. |
| * |
| * @param vertexId vertex id |
| * @return worker index |
| */ |
| int getWorkerForVertex(I vertexId); |
| } |