| /** |
| * |
| * 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.hbase.metrics; |
| |
| import java.util.Collection; |
| import java.util.Optional; |
| import java.util.Set; |
| |
| import org.apache.hadoop.hbase.HBaseInterfaceAudience; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.apache.yetus.audience.InterfaceStability; |
| |
| /** |
| * MetricRegistries is collection of MetricRegistry's. MetricsRegistries implementations should do |
| * ref-counting of MetricRegistry's via create() and remove() methods. |
| */ |
| @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC) |
| @InterfaceStability.Evolving |
| public abstract class MetricRegistries { |
| |
| private static final class LazyHolder { |
| private static final MetricRegistries GLOBAL = MetricRegistriesLoader.load(); |
| } |
| |
| /** |
| * Return the global singleton instance for the MetricRegistries. |
| * @return MetricRegistries implementation. |
| */ |
| public static MetricRegistries global() { |
| return LazyHolder.GLOBAL; |
| } |
| |
| /** |
| * Removes all the MetricRegisties. |
| */ |
| public abstract void clear(); |
| |
| /** |
| * Create or return MetricRegistry with the given info. MetricRegistry will only be created |
| * if current reference count is 0. Otherwise ref counted is incremented, and an existing instance |
| * will be returned. |
| * @param info the info object for the MetricRegistrytry. |
| * @return created or existing MetricRegistry. |
| */ |
| public abstract MetricRegistry create(MetricRegistryInfo info); |
| |
| /** |
| * Decrements the ref count of the MetricRegistry, and removes if ref count == 0. |
| * @param key the info object for the MetricRegistrytry. |
| * @return true if metric registry is removed. |
| */ |
| public abstract boolean remove(MetricRegistryInfo key); |
| |
| /** |
| * Returns the MetricRegistry if found. |
| * @param info the info for the registry. |
| * @return a MetricRegistry optional. |
| */ |
| public abstract Optional<MetricRegistry> get(MetricRegistryInfo info); |
| |
| /** |
| * Returns MetricRegistryInfo's for the MetricRegistry's created. |
| * @return MetricRegistryInfo's for the MetricRegistry's created. |
| */ |
| public abstract Set<MetricRegistryInfo> getMetricRegistryInfos(); |
| |
| /** |
| * Returns MetricRegistry's created. |
| * @return MetricRegistry's created. |
| */ |
| public abstract Collection<MetricRegistry> getMetricRegistries(); |
| } |