| /** |
| * 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.bookkeeper.stats.codahale; |
| |
| import static com.codahale.metrics.MetricRegistry.name; |
| import com.codahale.metrics.MetricRegistry; |
| import com.codahale.metrics.Timer; |
| |
| import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.bookkeeper.stats.OpStatsLogger; |
| import org.apache.bookkeeper.stats.StatsLogger; |
| |
| /** |
| * A {@link StatsLogger} implemented based on <i>Codahale</i> metrics library. |
| */ |
| public class FastCodahaleStatsLogger extends CodahaleStatsLogger { |
| |
| private static final ConcurrentHashMap<String, CodahaleOpStatsLogger> statsLoggerCache = |
| new ConcurrentHashMap<String, CodahaleOpStatsLogger>(); |
| |
| FastCodahaleStatsLogger(MetricRegistry metrics, String basename) { |
| super(metrics, basename); |
| } |
| |
| @Override |
| @SuppressFBWarnings( |
| value = { |
| "JLM_JSR166_UTILCONCURRENT_MONITORENTER", |
| "AT_OPERATION_SEQUENCE_ON_CONCURRENT_ABSTRACTION" |
| }, |
| justification = "We use synchronized (statsLoggerCache) to make get/put atomic") |
| public OpStatsLogger getOpStatsLogger(String statName) { |
| CodahaleOpStatsLogger logger; |
| String nameSuccess = name(basename, statName); |
| logger = statsLoggerCache.get(nameSuccess); |
| if (logger == null) { |
| synchronized (statsLoggerCache) { |
| // check again now that we have the lock |
| logger = statsLoggerCache.get(nameSuccess); |
| if (logger == null) { |
| String nameFailure = name(basename, statName + "-fail"); |
| FastTimer success; |
| FastTimer failure; |
| Map<String, Timer> timers = metrics.getTimers(); |
| success = timers != null ? (FastTimer) timers.get(nameSuccess) : null; |
| if (success == null) { |
| success = new FastTimer(60, FastTimer.Buckets.fine); |
| metrics.register(nameSuccess, success); |
| } |
| failure = timers != null ? (FastTimer) timers.get(nameFailure) : null; |
| if (failure == null) { |
| failure = new FastTimer(60, FastTimer.Buckets.coarse); |
| metrics.register(nameFailure, failure); |
| } |
| logger = new CodahaleOpStatsLogger(success, failure); |
| statsLoggerCache.put(nameSuccess, logger); |
| } |
| } |
| } |
| return logger; |
| } |
| |
| @Override |
| public StatsLogger scope(String scope) { |
| String scopeName; |
| if (basename == null || 0 == basename.length()) { |
| scopeName = scope; |
| } else { |
| scopeName = name(basename, scope); |
| } |
| return new FastCodahaleStatsLogger(metrics, scopeName); |
| } |
| |
| } |