| package org.apache.helix.monitoring.mbeans.dynamicMBeans; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.lang.reflect.Method; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| import javax.management.MBeanAttributeInfo; |
| |
| import com.codahale.metrics.Histogram; |
| import com.codahale.metrics.Snapshot; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * The dynamic metric that accept Long monitor data and emits histogram information based on the input |
| */ |
| public class HistogramDynamicMetric extends DynamicMetric<Histogram, Long> { |
| private static final Logger _logger = LoggerFactory.getLogger(HistogramDynamicMetric.class); |
| |
| private final Set<String> _attributeNameSet; |
| |
| /** |
| * The enum statistic attributes |
| */ |
| enum SnapshotAttribute { |
| Pct75th("get75thPercentile", "75Pct"), |
| Pct95th("get95thPercentile", "95Pct"), |
| Pct99th("get99thPercentile", "99Pct"), |
| Max("getMax", "Max"), |
| Mean("getMean", "Mean"), |
| StdDev("getStdDev", "StdDev"); |
| |
| final String _getMethodName; |
| final String _attributeName; |
| |
| SnapshotAttribute(String getMethodName, String attributeName) { |
| _getMethodName = getMethodName; |
| _attributeName = attributeName; |
| } |
| } |
| |
| /** |
| * Instantiates a new Histogram dynamic metric. |
| * |
| * @param metricName the metric name |
| * @param metricObject the metric object |
| */ |
| public HistogramDynamicMetric(String metricName, Histogram metricObject) { |
| super(metricName, metricObject); |
| |
| _attributeNameSet = new HashSet<>(); |
| Iterator<MBeanAttributeInfo> iter = getAttributeInfos().iterator(); |
| while (iter.hasNext()) { |
| MBeanAttributeInfo attributeInfo = iter.next(); |
| _attributeNameSet.add(attributeInfo.getName()); |
| } |
| } |
| |
| @Override |
| public Number getAttributeValue(String attributeName) { |
| if (!_attributeNameSet.contains(attributeName)) { |
| return null; |
| } |
| |
| String[] attributeNameParts = attributeName.split("\\."); |
| if (attributeNameParts.length == 2) { |
| try { |
| SnapshotAttribute snapshotAttribute = SnapshotAttribute.valueOf(attributeNameParts[1]); |
| Method getMethod = Snapshot.class.getMethod(snapshotAttribute._getMethodName); |
| Snapshot snapshot = getMetricObject().getSnapshot(); |
| if (snapshot != null) { |
| return (Number) getMethod.invoke(snapshot); |
| } |
| } catch (Exception ex) { |
| _logger |
| .error(String.format("Failed to get Snapshot value for attribute: %s", attributeName), |
| ex); |
| } |
| } else { |
| _logger.error(String.format("Invalid attribute name format: %s", attributeName)); |
| } |
| return null; |
| } |
| |
| @Override |
| public void updateValue(Long value) { |
| getMetricObject().update(value); |
| } |
| |
| @Override |
| protected Set<MBeanAttributeInfo> generateAttributeInfos(String metricName, |
| Histogram metricObject) { |
| Set<MBeanAttributeInfo> attributeInfoSet = new HashSet<>(); |
| |
| for (SnapshotAttribute snapshotAttribute : SnapshotAttribute.values()) { |
| try { |
| Method getMethod = Snapshot.class.getMethod(snapshotAttribute._getMethodName); |
| attributeInfoSet.add( |
| new MBeanAttributeInfo(getSnapshotAttributeName(metricName, snapshotAttribute.name()), |
| getMethod.getReturnType().getName(), DEFAULT_ATTRIBUTE_DESCRIPTION, true, false, |
| false)); |
| } catch (NoSuchMethodException e) { |
| _logger.error( |
| "Cannot generate AttributeInfo for Attribute: " + snapshotAttribute._attributeName, e); |
| } |
| } |
| |
| return attributeInfoSet; |
| } |
| |
| private String getSnapshotAttributeName(String metricName, String snapshotAttribute) { |
| return String.format("%s.%s", metricName, snapshotAttribute); |
| } |
| } |