public void run() {
super.run();
// save the last set of active JVMs
Set lastActiveVms = activeVms;
try {
// get the current set of active JVMs
activeVms = (HashSet) vmManager.activeVms();
} catch (MonitorException e) {
// XXX: use logging api
System.err.println("MonitoredHostProvider: polling task " + "caught MonitorException:");
e.printStackTrace();
// mark the HostManager as errored and notify listeners
setLastException(e);
fireDisconnectedEvents();
}
if (activeVms.isEmpty()) {
return;
}
Set startedVms = new HashSet();
Set terminatedVms = new HashSet();
for (Iterator i = activeVms.iterator(); i.hasNext(); /* empty */ ) {
Integer vmid = (Integer) i.next();
if (!lastActiveVms.contains(vmid)) {
// a new file has been detected, add to set
startedVms.add(vmid);
}
}
for (Iterator i = lastActiveVms.iterator(); i.hasNext();
/* empty */ ) {
Object o = i.next();
if (!activeVms.contains(o)) {
// JVM has terminated, remove it from the active list
terminatedVms.add(o);
}
}
if (!startedVms.isEmpty() || !terminatedVms.isEmpty()) {
fireVmStatusChangedEvents(activeVms, startedVms, terminatedVms);
}
}
static int findVmid(String agentName) {
MonitoredHost host;
if (activeVms == null) {
try {
host = MonitoredHost.getMonitoredHost(new HostIdentifier((String) null));
activeVms = host.activeVms();
} catch (java.net.URISyntaxException e) {
throw new InternalError(e.getMessage());
} catch (sun.jvmstat.monitor.MonitorException e) {
throw new InternalError(e.getMessage());
}
}
for (Object vm : activeVms) {
try {
String address = ConnectorAddressLink.importFrom((Integer) vm);
if (address == null) continue;
JMXConnector jmxc;
MBeanServerConnection server;
JMXServiceURL jmxUrl = new JMXServiceURL(address);
jmxc = JMXConnectorFactory.connect(jmxUrl);
server = jmxc.getMBeanServerConnection();
Object result;
result = server.getAttribute(new ObjectName("net.multiverse:type=Engine"), "AgentName");
jmxc.close();
if (result != null && result.toString().equals(agentName)) return (Integer) vm;
} catch (IOException e) {
System.err.println("Unable to attach to " + (Integer) vm + ": " + e.getMessage());
} catch (javax.management.InstanceNotFoundException e) {
// ignore
} catch (JMException e) {
System.err.println("Unable to attach to " + (Integer) vm + ": " + e);
}
}
return -1;
}