| /** |
| * 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.lang.reflect.Method; |
| import java.util.Set; |
| |
| import static com.google.common.base.Preconditions.*; |
| import com.google.common.collect.Sets; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.metrics2.MetricsRecordBuilder; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Helper class to manage a group of mutable rate metrics |
| * |
| * This class synchronizes all accesses to the metrics it |
| * contains, so it should not be used in situations where |
| * there is high contention on the metrics. |
| * {@link MutableRatesWithAggregation} is preferable in that |
| * situation. |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class MutableRates extends MutableMetric { |
| static final Logger LOG = LoggerFactory.getLogger(MutableRates.class); |
| private final MetricsRegistry registry; |
| private final Set<Class<?>> protocolCache = Sets.newHashSet(); |
| |
| MutableRates(MetricsRegistry registry) { |
| this.registry = checkNotNull(registry, "metrics registry"); |
| } |
| |
| /** |
| * Initialize the registry with all the methods in a protocol |
| * so they all show up in the first snapshot. |
| * Convenient for JMX implementations. |
| * @param protocol the protocol class |
| */ |
| public void init(Class<?> protocol) { |
| if (protocolCache.contains(protocol)) return; |
| protocolCache.add(protocol); |
| for (Method method : protocol.getDeclaredMethods()) { |
| String name = method.getName(); |
| LOG.debug(name); |
| try { registry.newRate(name, name, false, true); } |
| catch (Exception e) { |
| LOG.error("Error creating rate metrics for "+ method.getName(), e); |
| } |
| } |
| } |
| |
| /** |
| * Add a rate sample for a rate metric |
| * @param name of the rate metric |
| * @param elapsed time |
| */ |
| public void add(String name, long elapsed) { |
| registry.add(name, elapsed); |
| } |
| |
| @Override |
| public void snapshot(MetricsRecordBuilder rb, boolean all) { |
| registry.snapshot(rb, all); |
| } |
| } |