| /** |
| * 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.metrics.util; |
| |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| |
| /** |
| * |
| * This is the registry for metrics. |
| * Related set of metrics should be declared in a holding class and registered |
| * in a registry for those metrics which is also stored in the the holding class. |
| * |
| * @deprecated in favor of {@link org.apache.hadoop.metrics2.lib.MetricsRegistry}. |
| */ |
| @Deprecated |
| @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) |
| public class MetricsRegistry { |
| private Map<String, MetricsBase> metricsList = new HashMap<String, MetricsBase>(); |
| |
| public MetricsRegistry() { |
| } |
| |
| /** |
| * |
| * @return number of metrics in the registry |
| */ |
| public int size() { |
| return metricsList.size(); |
| } |
| |
| /** |
| * Add a new metrics to the registry |
| * @param metricsName - the name |
| * @param theMetricsObj - the metrics |
| * @throws IllegalArgumentException if a name is already registered |
| */ |
| public synchronized void add(final String metricsName, final MetricsBase theMetricsObj) { |
| if (metricsList.containsKey(metricsName)) { |
| throw new IllegalArgumentException("Duplicate metricsName:" + metricsName); |
| } |
| metricsList.put(metricsName, theMetricsObj); |
| } |
| |
| |
| /** |
| * |
| * @param metricsName |
| * @return the metrics if there is one registered by the supplied name. |
| * Returns null if none is registered |
| */ |
| public synchronized MetricsBase get(final String metricsName) { |
| return metricsList.get(metricsName); |
| } |
| |
| |
| /** |
| * |
| * @return the list of metrics names |
| */ |
| public synchronized Collection<String> getKeyList() { |
| return metricsList.keySet(); |
| } |
| |
| /** |
| * |
| * @return the list of metrics |
| */ |
| public synchronized Collection<MetricsBase> getMetricsList() { |
| return metricsList.values(); |
| } |
| } |