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.counters; 20 21 import org.apache.hadoop.mapreduce.Mapper.Context; 22 23 /** 24 * Base class for groups of Hadoop Counters. 25 */ 26 public abstract class HadoopCountersBase 27 implements Iterable<GiraphHadoopCounter> { 28 /** Hadoop Context used to create Counters */ 29 private final Context context; 30 /** group to put counters under */ 31 private final String groupName; 32 33 /** 34 * Initialize with Hadoop Context and group name. 35 * 36 * @param context Hadoop Context to use. 37 * @param groupName String group name to use. 38 */ 39 protected HadoopCountersBase(Context context, String groupName) { 40 this.context = context; 41 this.groupName = groupName; 42 } 43 44 /** 45 * Get Hadoop Context 46 * 47 * @return Context object used by Hadoop 48 */ 49 public Context getContext() { 50 return context; 51 } 52 53 /** 54 * Get or create counter with given name and class's group name. 55 * 56 * @param name String name of counter 57 * @return GiraphHadoopCounter found or created 58 */ 59 protected GiraphHadoopCounter getCounter(String name) { 60 return new GiraphHadoopCounter(context.getCounter(groupName, name)); 61 } 62 }