| /* |
| * Copyright (c) 2004, 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.jvmstat.perfdata.monitor.protocol.rmi; |
| |
| import sun.jvmstat.monitor.*; |
| import sun.jvmstat.monitor.event.*; |
| import sun.jvmstat.monitor.remote.*; |
| import sun.jvmstat.perfdata.monitor.*; |
| import java.util.*; |
| import java.net.*; |
| import java.io.*; |
| import java.rmi.*; |
| import java.util.HashMap; |
| |
| /** |
| * Concrete implementation of the MonitoredHost interface for the |
| * <em>rmi</em> protocol of the HotSpot PerfData monitoring implementation. |
| * |
| * @author Brian Doherty |
| * @since 1.5 |
| */ |
| public class MonitoredHostProvider extends MonitoredHost { |
| private static final String serverName = "/JStatRemoteHost"; |
| private static final int DEFAULT_POLLING_INTERVAL = 1000; |
| |
| private ArrayList<HostListener> listeners; |
| private NotifierTask task; |
| private HashSet<Integer> activeVms; |
| private RemoteVmManager vmManager; |
| private RemoteHost remoteHost; |
| private Timer timer; |
| |
| /** |
| * Create a MonitoredHostProvider instance using the given HostIdentifier. |
| * |
| * @param hostId the host identifier for this MonitoredHost |
| * @throws MonitorException Thrown on any error encountered while |
| * communicating with the remote host. |
| */ |
| public MonitoredHostProvider(HostIdentifier hostId) |
| throws MonitorException { |
| this.hostId = hostId; |
| this.listeners = new ArrayList<HostListener>(); |
| this.interval = DEFAULT_POLLING_INTERVAL; |
| this.activeVms = new HashSet<Integer>(); |
| |
| String rmiName; |
| String sn = serverName; |
| String path = hostId.getPath(); |
| |
| if ((path != null) && (path.length() > 0)) { |
| sn = path; |
| } |
| |
| if (hostId.getPort() != -1) { |
| rmiName = "rmi://" + hostId.getHost() + ":" + hostId.getPort() + sn; |
| } else { |
| rmiName = "rmi://" + hostId.getHost() + sn; |
| } |
| |
| try { |
| remoteHost = (RemoteHost)Naming.lookup(rmiName); |
| |
| } catch (RemoteException e) { |
| /* |
| * rmi registry not available |
| * |
| * Access control exceptions, where the rmi server refuses a |
| * connection based on policy file configuration, come through |
| * here on the client side. Unfortunately, the RemoteException |
| * doesn't contain enough information to determine the true cause |
| * of the exception. So, we have to output a rather generic message. |
| */ |
| String message = "RMI Registry not available at " |
| + hostId.getHost(); |
| |
| if (hostId.getPort() == -1) { |
| message = message + ":" |
| + java.rmi.registry.Registry.REGISTRY_PORT; |
| } else { |
| message = message + ":" + hostId.getPort(); |
| } |
| |
| if (e.getMessage() != null) { |
| throw new MonitorException(message + "\n" + e.getMessage(), e); |
| } else { |
| throw new MonitorException(message, e); |
| } |
| |
| } catch (NotBoundException e) { |
| // no server with given name |
| String message = e.getMessage(); |
| if (message == null) message = rmiName; |
| throw new MonitorException("RMI Server " + message |
| + " not available", e); |
| } catch (MalformedURLException e) { |
| // this is a programming problem |
| e.printStackTrace(); |
| throw new IllegalArgumentException("Malformed URL: " + rmiName); |
| } |
| this.vmManager = new RemoteVmManager(remoteHost); |
| this.timer = new Timer(true); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public MonitoredVm getMonitoredVm(VmIdentifier vmid) |
| throws MonitorException { |
| return getMonitoredVm(vmid, DEFAULT_POLLING_INTERVAL); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public MonitoredVm getMonitoredVm(VmIdentifier vmid, int interval) |
| throws MonitorException { |
| VmIdentifier nvmid = null; |
| try { |
| nvmid = hostId.resolve(vmid); |
| RemoteVm rvm = remoteHost.attachVm(vmid.getLocalVmId(), |
| vmid.getMode()); |
| RemoteMonitoredVm rmvm = new RemoteMonitoredVm(rvm, nvmid, timer, |
| interval); |
| rmvm.attach(); |
| return rmvm; |
| |
| } catch (RemoteException e) { |
| throw new MonitorException("Remote Exception attaching to " |
| + nvmid.toString(), e); |
| } catch (URISyntaxException e) { |
| /* |
| * the VmIdentifier is expected to be a valid and should resolve |
| * easonably against the host identifier. A URISyntaxException |
| * here is most likely a programming error. |
| */ |
| throw new IllegalArgumentException("Malformed URI: " |
| + vmid.toString(), e); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void detach(MonitoredVm vm) throws MonitorException { |
| RemoteMonitoredVm rmvm = (RemoteMonitoredVm)vm; |
| rmvm.detach(); |
| try { |
| remoteHost.detachVm(rmvm.getRemoteVm()); |
| |
| } catch (RemoteException e) { |
| throw new MonitorException("Remote Exception detaching from " |
| + vm.getVmIdentifier().toString(), e); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void addHostListener(HostListener listener) { |
| synchronized(listeners) { |
| listeners.add(listener); |
| if (task == null) { |
| task = new NotifierTask(); |
| timer.schedule(task, 0, interval); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void removeHostListener(HostListener listener) { |
| /* |
| * XXX: if a disconnect method is added, make sure it calls |
| * this method to unregister this object from the watcher. otherwise, |
| * an unused MonitoredHostProvider instance may go uncollected. |
| */ |
| synchronized(listeners) { |
| listeners.remove(listener); |
| if (listeners.isEmpty() && (task != null)) { |
| task.cancel(); |
| task = null; |
| } |
| } |
| } |
| |
| public void setInterval(int newInterval) { |
| synchronized(listeners) { |
| if (newInterval == interval) { |
| return; |
| } |
| |
| int oldInterval = interval; |
| super.setInterval(newInterval); |
| |
| if (task != null) { |
| task.cancel(); |
| NotifierTask oldTask = task; |
| task = new NotifierTask(); |
| CountedTimerTaskUtils.reschedule(timer, oldTask, task, |
| oldInterval, newInterval); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Set<Integer> activeVms() throws MonitorException { |
| return vmManager.activeVms(); |
| } |
| |
| /** |
| * Fire VmStatusChangeEvent events to HostListener objects |
| * |
| * @param active Set of Integer objects containing the local |
| * Vm Identifiers of the active JVMs |
| * @param started Set of Integer objects containing the local |
| * Vm Identifiers of new JVMs started since last |
| * interval. |
| * @param terminated Set of Integer objects containing the local |
| * Vm Identifiers of terminated JVMs since last |
| * interval. |
| */ |
| @SuppressWarnings("unchecked") // Cast of result of clone |
| private void fireVmStatusChangedEvents(Set<Integer> active, Set<Integer> started, |
| Set<Integer> terminated) { |
| ArrayList<HostListener> registered = null; |
| VmStatusChangeEvent ev = null; |
| |
| synchronized(listeners) { |
| registered = (ArrayList)listeners.clone(); |
| } |
| |
| for (Iterator<HostListener> i = registered.iterator(); i.hasNext(); /* empty */) { |
| HostListener l = i.next(); |
| if (ev == null) { |
| ev = new VmStatusChangeEvent(this, active, started, terminated); |
| } |
| l.vmStatusChanged(ev); |
| } |
| } |
| |
| /** |
| * Fire hostDisconnectEvent events. |
| */ |
| @SuppressWarnings("unchecked") // Cast of result of clone |
| void fireDisconnectedEvents() { |
| ArrayList<HostListener> registered = null; |
| HostEvent ev = null; |
| |
| synchronized(listeners) { |
| registered = (ArrayList)listeners.clone(); |
| } |
| |
| for (Iterator<HostListener> i = registered.iterator(); i.hasNext(); /* empty */) { |
| HostListener l = i.next(); |
| if (ev == null) { |
| ev = new HostEvent(this); |
| } |
| l.disconnected(ev); |
| } |
| } |
| |
| /** |
| * class to poll the remote machine and generate local event notifications. |
| */ |
| private class NotifierTask extends CountedTimerTask { |
| public void run() { |
| super.run(); |
| |
| // save the last set of active JVMs |
| Set<Integer> lastActiveVms = activeVms; |
| |
| try { |
| // get the current set of active JVMs |
| activeVms = (HashSet<Integer>)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<Integer> startedVms = new HashSet<>(); |
| Set<Integer> terminatedVms = new HashSet<>(); |
| |
| for (Iterator<Integer> i = activeVms.iterator(); i.hasNext(); /* empty */ ) { |
| Integer vmid = i.next(); |
| if (!lastActiveVms.contains(vmid)) { |
| // a new file has been detected, add to set |
| startedVms.add(vmid); |
| } |
| } |
| |
| for (Iterator<Integer> i = lastActiveVms.iterator(); i.hasNext(); |
| /* empty */ ) { |
| Integer 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); |
| } |
| } |
| } |
| } |