/**
* Copyright 2016 Yahoo Inc.
*
* Licensed 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 com.yahoo.pulsar.broker.stats;
import java.lang.management.ManagementFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServer;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import com.google.common.collect.Maps;
import com.yahoo.pulsar.broker.PulsarService;
import com.yahoo.pulsar.common.stats.Metrics;
public class MBeanStatsGenerator {
private MBeanServer mbs;
public static Collection<Metrics> generate(PulsarService pulsar) {
return new MBeanStatsGenerator(pulsar).generate();
}
// hide
MBeanStatsGenerator(PulsarService pulsar) {
this.mbs = ManagementFactory.getPlatformMBeanServer();
}
private Collection<Metrics> generate() {
List<Metrics> metricsCollection = new ArrayList<Metrics>();
@SuppressWarnings("unchecked")
Set<ObjectInstance> instances = mbs.queryMBeans(null, null);
for (ObjectInstance instance : instances) {
String beanName = instance.getObjectName().toString();
// skip GC MBean to avoid recursion
if (beanName.startsWith("java.lang:type=GarbageCollector")) {
continue;
}
Metrics metrics = convert(instance);
if (metrics != null) {
metricsCollection.add(metrics);
}
}
return metricsCollection;
}
private Metrics convert(ObjectInstance instance) {
ObjectName objName = instance.getObjectName();
MBeanInfo info = null;
try {
info = mbs.getMBeanInfo(objName);
} catch (Exception e) {
// [Bug 6158364] skipping MBean if access failed
return null;
}
Metrics metrics = null;
// create a metrics instance by MBean dimension
metrics = createMetricsByDimension(objName);
// get each of attribute,value from the MBean
for (MBeanAttributeInfo attr : info.getAttributes()) {
Object value;
try {
value = mbs.getAttribute(instance.getObjectName(), attr.getName());
metrics.put(attr.getName(), value);
} catch (Exception e) {
// skip
}
}
return metrics;
}
/**
* Creates a MBean dimension key for metrics
*
* @param objectName
* @return
*/
private Metrics createMetricsByDimension(ObjectName objectName) {
Map<String, String> dimensionMap = Maps.newHashMap();
dimensionMap.put("MBean", objectName.toString());
// create with current version
return Metrics.create(dimensionMap);
}
}