| 1 | package com.hammurapi.eventbus.monitoring; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.Collection; |
| 5 | import java.util.Map; |
| 6 | import java.util.concurrent.ConcurrentHashMap; |
| 7 | |
| 8 | import javax.management.MBeanServer; |
| 9 | import javax.management.ObjectName; |
| 10 | import javax.management.StandardMBean; |
| 11 | |
| 12 | import com.hammurapi.eventbus.EventBusException; |
| 13 | |
| 14 | /** |
| 15 | * Statistics collector which exposes statistics as MBeans. |
| 16 | * @author Pavel Vlasov |
| 17 | * |
| 18 | */ |
| 19 | public class JmxStatsCollector implements StatsCollector { |
| 20 | |
| 21 | private static volatile long keyCounter; |
| 22 | |
| 23 | private MBeanServer mBeanServer; |
| 24 | private String objectNamePrefix; |
| 25 | |
| 26 | private Map<Stats, Iterable<ObjectName>> regInfo = new ConcurrentHashMap<Stats, Iterable<ObjectName>>(); |
| 27 | |
| 28 | /** |
| 29 | * @param mBeanServer MBean server to register statistics MBeans. |
| 30 | * @param objectNamePrefix Object name prefix for statistics MBeans without trailing comma. |
| 31 | * E.g. <code>mycategory:mykey=myvalue</code>. |
| 32 | */ |
| 33 | public JmxStatsCollector(MBeanServer mBeanServer, String objectNamePrefix) { |
| 34 | this.mBeanServer = mBeanServer; |
| 35 | this.objectNamePrefix = objectNamePrefix; |
| 36 | } |
| 37 | |
| 38 | @Override |
| 39 | public void add(Stats root) { |
| 40 | Collection<ObjectName> reg = new ArrayList<ObjectName>(); |
| 41 | add(root, objectNamePrefix, reg); |
| 42 | } |
| 43 | |
| 44 | private void add(Stats stats, String prefix, Collection<ObjectName> reg) { |
| 45 | @SuppressWarnings("unchecked") |
| 46 | Class<Stats> mBeanInterface = (Class<Stats>) stats.getClass().getInterfaces()[0]; |
| 47 | int idx = mBeanInterface.getName().lastIndexOf('.'); |
| 48 | String key = mBeanInterface.getName().substring(idx+1)+"("+(++keyCounter)+")"; |
| 49 | String name = prefix+","+key+"="+stats.getName(); |
| 50 | try { |
| 51 | ObjectName oName = new ObjectName(name); |
| 52 | reg.add(oName); |
| 53 | mBeanServer.registerMBean(new StandardMBean(stats, mBeanInterface), oName); |
| 54 | } catch (Exception e) { |
| 55 | throw new EventBusException(e); |
| 56 | } |
| 57 | for (Stats child: stats.children()) { |
| 58 | add(child, name, reg); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | public void remove(Stats root) { |
| 63 | for (ObjectName oName: regInfo.get(root)) { |
| 64 | try { |
| 65 | mBeanServer.unregisterMBean(oName); |
| 66 | } catch (Exception e) { |
| 67 | throw new EventBusException(e); |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | } |