| /** |
| * 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.metrics2.lib; |
| |
| import java.util.concurrent.atomic.AtomicReference; |
| import javax.management.ObjectName; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.metrics2.MetricsException; |
| import org.apache.hadoop.metrics2.MetricsSystem; |
| import org.apache.hadoop.metrics2.impl.MetricsSystemImpl; |
| |
| /** |
| * The default metrics system singleton |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public enum DefaultMetricsSystem { |
| INSTANCE; // the singleton |
| |
| private AtomicReference<MetricsSystem> impl = |
| new AtomicReference<MetricsSystem>(new MetricsSystemImpl()); |
| volatile boolean miniClusterMode = false; |
| transient final UniqueNames mBeanNames = new UniqueNames(); |
| transient final UniqueNames sourceNames = new UniqueNames(); |
| |
| /** |
| * Convenience method to initialize the metrics system |
| * @param prefix for the metrics system configuration |
| * @return the metrics system instance |
| */ |
| public static MetricsSystem initialize(String prefix) { |
| return INSTANCE.init(prefix); |
| } |
| |
| MetricsSystem init(String prefix) { |
| return impl.get().init(prefix); |
| } |
| |
| /** |
| * @return the metrics system object |
| */ |
| public static MetricsSystem instance() { |
| return INSTANCE.getImpl(); |
| } |
| |
| /** |
| * Shutdown the metrics system |
| */ |
| public static void shutdown() { |
| INSTANCE.shutdownInstance(); |
| } |
| |
| void shutdownInstance() { |
| boolean last = impl.get().shutdown(); |
| if (last) synchronized(this) { |
| mBeanNames.map.clear(); |
| sourceNames.map.clear(); |
| } |
| } |
| |
| @InterfaceAudience.Private |
| public static MetricsSystem setInstance(MetricsSystem ms) { |
| return INSTANCE.setImpl(ms); |
| } |
| |
| MetricsSystem setImpl(MetricsSystem ms) { |
| return impl.getAndSet(ms); |
| } |
| |
| MetricsSystem getImpl() { return impl.get(); } |
| |
| @InterfaceAudience.Private |
| public static void setMiniClusterMode(boolean choice) { |
| INSTANCE.miniClusterMode = choice; |
| } |
| |
| @InterfaceAudience.Private |
| public static boolean inMiniClusterMode() { |
| return INSTANCE.miniClusterMode; |
| } |
| |
| @InterfaceAudience.Private |
| public static ObjectName newMBeanName(String name) { |
| return INSTANCE.newObjectName(name); |
| } |
| |
| @InterfaceAudience.Private |
| public static void removeMBeanName(ObjectName name) { |
| INSTANCE.removeObjectName(name.toString()); |
| } |
| |
| @InterfaceAudience.Private |
| public static void removeSourceName(String name) { |
| INSTANCE.removeSource(name); |
| } |
| |
| @InterfaceAudience.Private |
| public static String sourceName(String name, boolean dupOK) { |
| return INSTANCE.newSourceName(name, dupOK); |
| } |
| |
| synchronized ObjectName newObjectName(String name) { |
| try { |
| if (mBeanNames.map.containsKey(name) && !miniClusterMode) { |
| throw new MetricsException(name +" already exists!"); |
| } |
| return new ObjectName(mBeanNames.uniqueName(name)); |
| } catch (Exception e) { |
| throw new MetricsException(e); |
| } |
| } |
| |
| synchronized void removeObjectName(String name) { |
| mBeanNames.map.remove(name); |
| } |
| |
| synchronized void removeSource(String name) { |
| sourceNames.map.remove(name); |
| } |
| |
| synchronized String newSourceName(String name, boolean dupOK) { |
| if (sourceNames.map.containsKey(name)) { |
| if (dupOK) { |
| return name; |
| } else if (!miniClusterMode) { |
| throw new MetricsException("Metrics source "+ name +" already exists!"); |
| } |
| } |
| return sourceNames.uniqueName(name); |
| } |
| } |