| /** |
| * 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.hadoop.mapreduce; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.mapreduce.counters.Limits; |
| import org.apache.hadoop.mapreduce.counters.GenericCounter; |
| import org.apache.hadoop.mapreduce.counters.AbstractCounterGroup; |
| import org.apache.hadoop.mapreduce.counters.CounterGroupBase; |
| import org.apache.hadoop.mapreduce.counters.FileSystemCounterGroup; |
| import org.apache.hadoop.mapreduce.counters.AbstractCounters; |
| import org.apache.hadoop.mapreduce.counters.CounterGroupFactory; |
| import org.apache.hadoop.mapreduce.counters.FrameworkCounterGroup; |
| |
| /** |
| * <p><code>Counters</code> holds per job/task counters, defined either by the |
| * Map-Reduce framework or applications. Each <code>Counter</code> can be of |
| * any {@link Enum} type.</p> |
| * |
| * <p><code>Counters</code> are bunched into {@link CounterGroup}s, each |
| * comprising of counters from a particular <code>Enum</code> class. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class Counters extends AbstractCounters<Counter, CounterGroup> { |
| |
| // Mix framework group implementation into CounterGroup interface |
| private static class FrameworkGroupImpl<T extends Enum<T>> |
| extends FrameworkCounterGroup<T, Counter> implements CounterGroup { |
| |
| FrameworkGroupImpl(Class<T> cls) { |
| super(cls); |
| } |
| |
| @Override |
| protected FrameworkCounter<T> newCounter(T key) { |
| return new FrameworkCounter<T>(key, getName()); |
| } |
| |
| @Override |
| public CounterGroupBase<Counter> getUnderlyingGroup() { |
| return this; |
| } |
| } |
| |
| // Mix generic group implementation into CounterGroup interface |
| // and provide some mandatory group factory methods. |
| private static class GenericGroup extends AbstractCounterGroup<Counter> |
| implements CounterGroup { |
| |
| GenericGroup(String name, String displayName, Limits limits) { |
| super(name, displayName, limits); |
| } |
| |
| @Override |
| protected Counter newCounter(String name, String displayName, long value) { |
| return new GenericCounter(name, displayName, value); |
| } |
| |
| @Override |
| protected Counter newCounter() { |
| return new GenericCounter(); |
| } |
| |
| @Override |
| public CounterGroupBase<Counter> getUnderlyingGroup() { |
| return this; |
| } |
| } |
| |
| // Mix file system group implementation into the CounterGroup interface |
| private static class FileSystemGroup extends FileSystemCounterGroup<Counter> |
| implements CounterGroup { |
| |
| @Override |
| protected Counter newCounter(String scheme, FileSystemCounter key) { |
| return new FSCounter(scheme, key); |
| } |
| |
| @Override |
| public CounterGroupBase<Counter> getUnderlyingGroup() { |
| return this; |
| } |
| } |
| |
| /** |
| * Provide factory methods for counter group factory implementation. |
| * See also the GroupFactory in |
| * {@link org.apache.hadoop.mapred.Counters mapred.Counters} |
| */ |
| private static class GroupFactory |
| extends CounterGroupFactory<Counter, CounterGroup> { |
| |
| @Override |
| protected <T extends Enum<T>> |
| FrameworkGroupFactory<CounterGroup> |
| newFrameworkGroupFactory(final Class<T> cls) { |
| return new FrameworkGroupFactory<CounterGroup>() { |
| @Override public CounterGroup newGroup(String name) { |
| return new FrameworkGroupImpl<T>(cls); // impl in this package |
| } |
| }; |
| } |
| |
| @Override |
| protected CounterGroup newGenericGroup(String name, String displayName, |
| Limits limits) { |
| return new GenericGroup(name, displayName, limits); |
| } |
| |
| @Override |
| protected CounterGroup newFileSystemGroup() { |
| return new FileSystemGroup(); |
| } |
| } |
| |
| private static final GroupFactory groupFactory = new GroupFactory(); |
| |
| /** |
| * Default constructor |
| */ |
| public Counters() { |
| super(groupFactory); |
| } |
| |
| /** |
| * Construct the Counters object from the another counters object |
| * @param <C> the type of counter |
| * @param <G> the type of counter group |
| * @param counters the old counters object |
| */ |
| public <C extends Counter, G extends CounterGroupBase<C>> |
| Counters(AbstractCounters<C, G> counters) { |
| super(counters, groupFactory); |
| } |
| } |