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| 1 | +/* | |
| 2 | + * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.jvmstat.perfdata.monitor.protocol.rmi; | |
| 27 | + | |
| 28 | +import sun.jvmstat.monitor.*; | |
| 29 | +import sun.jvmstat.monitor.event.*; | |
| 30 | +import sun.jvmstat.monitor.remote.*; | |
| 31 | +import sun.jvmstat.perfdata.monitor.*; | |
| 32 | +import java.lang.reflect.*; | |
| 33 | +import java.util.*; | |
| 34 | +import java.io.*; | |
| 35 | +import java.nio.ByteBuffer; | |
| 36 | +import java.rmi.*; | |
| 37 | + | |
| 38 | +/** | |
| 39 | + * Concrete implementation of the AbstractMonitoredVm class for the | |
| 40 | + * <em>rmi:</em> protocol for the HotSpot PerfData monitoring implementation. | |
| 41 | + * <p> | |
| 42 | + * This class provides the ability to acquire to the instrumentation buffer | |
| 43 | + * of a live, remote target Java Virtual Machine through an RMI server. | |
| 44 | + * | |
| 45 | + * @author Brian Doherty | |
| 46 | + * @since 1.5 | |
| 47 | + */ | |
| 48 | +public class RemoteMonitoredVm extends AbstractMonitoredVm { | |
| 49 | + | |
| 50 | + private ArrayList<VmListener> listeners; | |
| 51 | + private NotifierTask notifierTask; | |
| 52 | + private SamplerTask samplerTask; | |
| 53 | + private Timer timer; | |
| 54 | + | |
| 55 | + private RemoteVm rvm; | |
| 56 | + private ByteBuffer updateBuffer; | |
| 57 | + | |
| 58 | + /** | |
| 59 | + * Create a RemoteMonitoredVm instance. | |
| 60 | + * | |
| 61 | + * @param rvm the proxy to the remote MonitoredVm instance. | |
| 62 | + * @param vmid the vm identifier specifying the remot target JVM | |
| 63 | + * @param timer the timer used to run polling tasks | |
| 64 | + * @param interval the sampling interval | |
| 65 | + */ | |
| 66 | + public RemoteMonitoredVm(RemoteVm rvm, VmIdentifier vmid, | |
| 67 | + Timer timer, int interval) | |
| 68 | + throws MonitorException { | |
| 69 | + super(vmid, interval); | |
| 70 | + this.rvm = rvm; | |
| 71 | + pdb = new PerfDataBuffer(rvm, vmid.getLocalVmId()); | |
| 72 | + this.listeners = new ArrayList<VmListener>(); | |
| 73 | + this.timer = timer; | |
| 74 | + } | |
| 75 | + | |
| 76 | + /** | |
| 77 | + * Method to attach to the remote MonitoredVm. | |
| 78 | + */ | |
| 79 | + public void attach() throws MonitorException { | |
| 80 | + updateBuffer = pdb.getByteBuffer().duplicate(); | |
| 81 | + | |
| 82 | + // if continuous sampling is requested, register with the sampler thread | |
| 83 | + if (interval > 0) { | |
| 84 | + samplerTask = new SamplerTask(); | |
| 85 | + timer.schedule(samplerTask, 0, interval); | |
| 86 | + } | |
| 87 | + } | |
| 88 | + | |
| 89 | + /** | |
| 90 | + * {@inheritDoc} | |
| 91 | + */ | |
| 92 | + public void detach() { | |
| 93 | + try { | |
| 94 | + if (interval > 0) { | |
| 95 | + if (samplerTask != null) { | |
| 96 | + samplerTask.cancel(); | |
| 97 | + samplerTask = null; | |
| 98 | + } | |
| 99 | + if (notifierTask != null) { | |
| 100 | + notifierTask.cancel(); | |
| 101 | + notifierTask = null; | |
| 102 | + } | |
| 103 | + sample(); | |
| 104 | + } | |
| 105 | + } catch (RemoteException e) { | |
| 106 | + // XXX: - use logging api? throw an exception instead? | |
| 107 | + System.err.println("Could not read data for remote JVM " + vmid); | |
| 108 | + e.printStackTrace(); | |
| 109 | + | |
| 110 | + } finally { | |
| 111 | + super.detach(); | |
| 112 | + } | |
| 113 | + } | |
| 114 | + | |
| 115 | + /** | |
| 116 | + * Get a copy of the remote instrumentation buffer. | |
| 117 | + *<p> | |
| 118 | + * The data in the remote instrumentation buffer is copied into | |
| 119 | + * a local byte buffer. | |
| 120 | + * | |
| 121 | + * @throws RemoteException Thrown on any communications errors with | |
| 122 | + * the remote system. | |
| 123 | + */ | |
| 124 | + public void sample() throws RemoteException { | |
| 125 | + assert updateBuffer != null; | |
| 126 | + ((PerfDataBuffer)pdb).sample(updateBuffer); | |
| 127 | + } | |
| 128 | + | |
| 129 | + /** | |
| 130 | + * Get the proxy to the remote MonitoredVm. | |
| 131 | + * | |
| 132 | + * @return RemoteVm - the proxy to the remote MonitoredVm. | |
| 133 | + */ | |
| 134 | + public RemoteVm getRemoteVm() { | |
| 135 | + return rvm; | |
| 136 | + } | |
| 137 | + | |
| 138 | + /** | |
| 139 | + * {@inheritDoc} | |
| 140 | + */ | |
| 141 | + public void addVmListener(VmListener l) { | |
| 142 | + synchronized(listeners) { | |
| 143 | + listeners.add(l); | |
| 144 | + if (notifierTask == null) { | |
| 145 | + notifierTask = new NotifierTask(); | |
| 146 | + timer.schedule(notifierTask, 0, interval); | |
| 147 | + } | |
| 148 | + } | |
| 149 | + } | |
| 150 | + | |
| 151 | + /** | |
| 152 | + * {@inheritDoc} | |
| 153 | + */ | |
| 154 | + public void removeVmListener(VmListener l) { | |
| 155 | + synchronized(listeners) { | |
| 156 | + listeners.remove(l); | |
| 157 | + if (listeners.isEmpty() && (notifierTask != null)) { | |
| 158 | + notifierTask.cancel(); | |
| 159 | + notifierTask = null; | |
| 160 | + } | |
| 161 | + } | |
| 162 | + } | |
| 163 | + | |
| 164 | + /** | |
| 165 | + * {@inheritDoc} | |
| 166 | + */ | |
| 167 | + public void setInterval(int newInterval) { | |
| 168 | + synchronized(listeners) { | |
| 169 | + if (newInterval == interval) { | |
| 170 | + return; | |
| 171 | + } | |
| 172 | + | |
| 173 | + int oldInterval = interval; | |
| 174 | + super.setInterval(newInterval); | |
| 175 | + | |
| 176 | + if (samplerTask != null) { | |
| 177 | + samplerTask.cancel(); | |
| 178 | + SamplerTask oldSamplerTask = samplerTask; | |
| 179 | + samplerTask = new SamplerTask(); | |
| 180 | + CountedTimerTaskUtils.reschedule(timer, oldSamplerTask, | |
| 181 | + samplerTask, oldInterval, | |
| 182 | + newInterval); | |
| 183 | + } | |
| 184 | + if (notifierTask != null) { | |
| 185 | + notifierTask.cancel(); | |
| 186 | + NotifierTask oldNotifierTask = notifierTask; | |
| 187 | + notifierTask = new NotifierTask(); | |
| 188 | + CountedTimerTaskUtils.reschedule(timer, oldNotifierTask, | |
| 189 | + notifierTask, oldInterval, | |
| 190 | + newInterval); | |
| 191 | + } | |
| 192 | + } | |
| 193 | + } | |
| 194 | + | |
| 195 | + /** | |
| 196 | + * Fire MonitoredVmStructureChanged events. | |
| 197 | + * | |
| 198 | + * @param inserted List of Monitor objects inserted. | |
| 199 | + * @param removed List of Monitor objects removed. | |
| 200 | + */ | |
| 201 | + void fireMonitorStatusChangedEvents(List inserted, List removed) { | |
| 202 | + ArrayList registered = null; | |
| 203 | + MonitorStatusChangeEvent ev = null; | |
| 204 | + | |
| 205 | + synchronized(listeners) { | |
| 206 | + registered = (ArrayList)listeners.clone(); | |
| 207 | + } | |
| 208 | + | |
| 209 | + for (Iterator i = registered.iterator(); i.hasNext(); /* empty */) { | |
| 210 | + VmListener l = (VmListener)i.next(); | |
| 211 | + if (ev == null) { | |
| 212 | + ev = new MonitorStatusChangeEvent(this, inserted, removed); | |
| 213 | + } | |
| 214 | + l.monitorStatusChanged(ev); | |
| 215 | + } | |
| 216 | + } | |
| 217 | + | |
| 218 | + /** | |
| 219 | + * Fire MonitoredVmStructureChanged events. | |
| 220 | + */ | |
| 221 | + void fireMonitorsUpdatedEvents() { | |
| 222 | + ArrayList registered = null; | |
| 223 | + VmEvent ev = null; | |
| 224 | + | |
| 225 | + synchronized(listeners) { | |
| 226 | + registered = (ArrayList)listeners.clone(); | |
| 227 | + } | |
| 228 | + | |
| 229 | + for (Iterator i = registered.iterator(); i.hasNext(); /* empty */) { | |
| 230 | + VmListener l = (VmListener)i.next(); | |
| 231 | + if (ev == null) { | |
| 232 | + ev = new VmEvent(this); | |
| 233 | + } | |
| 234 | + l.monitorsUpdated(ev); | |
| 235 | + } | |
| 236 | + } | |
| 237 | + | |
| 238 | + /* | |
| 239 | + * Timer Tasks. There are two separate timer tasks here. The SamplerTask | |
| 240 | + * is active whenever we are attached to the remote JVM with a periodic | |
| 241 | + * sampling interval > 0. The NotifierTask is only active if a VmListener | |
| 242 | + * has registered with this RemoteMonitoredVm instance. Also, in the future | |
| 243 | + * we may want to run these tasks at different intervals. Currently, | |
| 244 | + * they run at the same interval and some significant work may | |
| 245 | + * need to be done to complete the separation of these two intervals. | |
| 246 | + */ | |
| 247 | + | |
| 248 | + /** | |
| 249 | + * Class to periodically check the state of the defined monitors | |
| 250 | + * for the remote MonitoredVm instance and to notify listeners of | |
| 251 | + * any detected changes. | |
| 252 | + */ | |
| 253 | + private class NotifierTask extends CountedTimerTask { | |
| 254 | + public void run() { | |
| 255 | + super.run(); | |
| 256 | + try { | |
| 257 | + MonitorStatus status = getMonitorStatus(); | |
| 258 | + | |
| 259 | + List inserted = status.getInserted(); | |
| 260 | + List removed = status.getRemoved(); | |
| 261 | + | |
| 262 | + if (!inserted.isEmpty() || !removed.isEmpty()) { | |
| 263 | + fireMonitorStatusChangedEvents(inserted, removed); | |
| 264 | + } | |
| 265 | + } catch (MonitorException e) { | |
| 266 | + // XXX: use logging api? fire disconnect events? mark errored? | |
| 267 | + // fireDisconnectedEvents(); | |
| 268 | + System.err.println("Exception updating monitors for " | |
| 269 | + + getVmIdentifier()); | |
| 270 | + e.printStackTrace(); | |
| 271 | + // XXX: should we cancle the notifierTask here? | |
| 272 | + // this.cancel(); | |
| 273 | + } | |
| 274 | + } | |
| 275 | + } | |
| 276 | + | |
| 277 | + /** | |
| 278 | + * Class to periodically sample the remote instrumentation byte buffer | |
| 279 | + * and refresh the local copy. Registered listeners are notified of | |
| 280 | + * the completion of a sampling event. | |
| 281 | + */ | |
| 282 | + private class SamplerTask extends CountedTimerTask { | |
| 283 | + public void run() { | |
| 284 | + super.run(); | |
| 285 | + try { | |
| 286 | + sample(); | |
| 287 | + fireMonitorsUpdatedEvents(); | |
| 288 | + | |
| 289 | + } catch (RemoteException e) { | |
| 290 | + // XXX: use logging api, mark vm as errored. | |
| 291 | + System.err.println("Exception taking sample for " | |
| 292 | + + getVmIdentifier()); | |
| 293 | + e.printStackTrace(); | |
| 294 | + this.cancel(); | |
| 295 | + } | |
| 296 | + } | |
| 297 | + } | |
| 298 | +} | |