| /* |
| * Copyright 2004 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package sun.jvmstat.perfdata.monitor.protocol.local; |
| |
| import sun.jvmstat.monitor.*; |
| import sun.jvmstat.monitor.event.*; |
| import sun.jvmstat.perfdata.monitor.*; |
| import java.util.*; |
| import java.net.*; |
| |
| /** |
| * Concrete implementation of the MonitoredHost interface for the |
| * <em>local</em> protocol of the HotSpot PerfData monitoring implementation. |
| * |
| * @author Brian Doherty |
| * @since 1.5 |
| */ |
| public class MonitoredHostProvider extends MonitoredHost { |
| private static final int DEFAULT_POLLING_INTERVAL = 1000; |
| |
| private ArrayList<HostListener> listeners; |
| private NotifierTask task; |
| private HashSet<Integer> activeVms; |
| private LocalVmManager vmManager; |
| |
| /** |
| * Create a MonitoredHostProvider instance using the given HostIdentifier. |
| * |
| * @param hostId the host identifier for this MonitoredHost |
| */ |
| public MonitoredHostProvider(HostIdentifier hostId) { |
| this.hostId = hostId; |
| this.listeners = new ArrayList<HostListener>(); |
| this.interval = DEFAULT_POLLING_INTERVAL; |
| this.activeVms = new HashSet<Integer>(); |
| this.vmManager = new LocalVmManager(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public MonitoredVm getMonitoredVm(VmIdentifier vmid) |
| throws MonitorException { |
| return getMonitoredVm(vmid, DEFAULT_POLLING_INTERVAL); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public MonitoredVm getMonitoredVm(VmIdentifier vmid, int interval) |
| throws MonitorException { |
| try { |
| VmIdentifier nvmid = hostId.resolve(vmid); |
| return new LocalMonitoredVm(nvmid, interval); |
| } catch (URISyntaxException e) { |
| /* |
| * the VmIdentifier is expected to be a valid and it should |
| * resolve reasonably 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) { |
| vm.detach(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void addHostListener(HostListener listener) { |
| synchronized(listeners) { |
| listeners.add(listener); |
| if (task == null) { |
| task = new NotifierTask(); |
| LocalEventTimer timer = LocalEventTimer.getInstance(); |
| timer.schedule(task, interval, interval); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void removeHostListener(HostListener listener) { |
| synchronized(listeners) { |
| listeners.remove(listener); |
| if (listeners.isEmpty() && (task != null)) { |
| task.cancel(); |
| task = null; |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void setInterval(int newInterval) { |
| synchronized(listeners) { |
| if (newInterval == interval) { |
| return; |
| } |
| |
| int oldInterval = interval; |
| super.setInterval(interval); |
| |
| if (task != null) { |
| task.cancel(); |
| NotifierTask oldTask = task; |
| task = new NotifierTask(); |
| LocalEventTimer timer = LocalEventTimer.getInstance(); |
| CountedTimerTaskUtils.reschedule(timer, oldTask, task, |
| oldInterval, newInterval); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Set<Integer> activeVms() { |
| return vmManager.activeVms(); |
| } |
| |
| /** |
| * Fire VmEvent events. |
| * |
| * @param active a set of Integer objects containing the vmid of |
| * the active Vms |
| * @param started a set of Integer objects containing the vmid of |
| * new Vms started since last interval. |
| * @param terminated a set of Integer objects containing the vmid of |
| * terminated Vms since last interval. |
| */ |
| private void fireVmStatusChangedEvents(Set active, Set started, |
| Set terminated) { |
| ArrayList registered = null; |
| VmStatusChangeEvent ev = null; |
| |
| synchronized(listeners) { |
| registered = (ArrayList)listeners.clone(); |
| } |
| |
| for (Iterator i = registered.iterator(); i.hasNext(); /* empty */) { |
| HostListener l = (HostListener)i.next(); |
| if (ev == null) { |
| ev = new VmStatusChangeEvent(this, active, started, terminated); |
| } |
| l.vmStatusChanged(ev); |
| } |
| } |
| |
| /** |
| * Class to poll the local system and generate event notifications. |
| */ |
| private class NotifierTask extends CountedTimerTask { |
| public void run() { |
| super.run(); |
| |
| // save the last set of active JVMs |
| Set lastActiveVms = activeVms; |
| |
| // get the current set of active JVMs |
| activeVms = (HashSet<Integer>)vmManager.activeVms(); |
| |
| if (activeVms.isEmpty()) { |
| return; |
| } |
| Set<Integer> startedVms = new HashSet<Integer>(); |
| Set<Object> terminatedVms = new HashSet<Object>(); |
| |
| 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); |
| } |
| } |
| } |
| } |