diff -r 6beb09485bdd -r f30070a16a4b jdk/src/jdk.jvmstat.rmi/share/classes/sun/jvmstat/perfdata/monitor/protocol/rmi/RemoteMonitoredVm.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/jdk.jvmstat.rmi/share/classes/sun/jvmstat/perfdata/monitor/protocol/rmi/RemoteMonitoredVm.java Fri Nov 13 14:44:05 2015 +0100
@@ -0,0 +1,300 @@
+/*
+ * 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.lang.reflect.*;
+import java.util.*;
+import java.io.*;
+import java.nio.ByteBuffer;
+import java.rmi.*;
+
+/**
+ * Concrete implementation of the AbstractMonitoredVm class for the
+ * rmi: protocol for the HotSpot PerfData monitoring implementation.
+ *
+ * This class provides the ability to acquire to the instrumentation buffer
+ * of a live, remote target Java Virtual Machine through an RMI server.
+ *
+ * @author Brian Doherty
+ * @since 1.5
+ */
+public class RemoteMonitoredVm extends AbstractMonitoredVm {
+
+ private ArrayList listeners;
+ private NotifierTask notifierTask;
+ private SamplerTask samplerTask;
+ private Timer timer;
+
+ private RemoteVm rvm;
+ private ByteBuffer updateBuffer;
+
+ /**
+ * Create a RemoteMonitoredVm instance.
+ *
+ * @param rvm the proxy to the remote MonitoredVm instance.
+ * @param vmid the vm identifier specifying the remot target JVM
+ * @param timer the timer used to run polling tasks
+ * @param interval the sampling interval
+ */
+ public RemoteMonitoredVm(RemoteVm rvm, VmIdentifier vmid,
+ Timer timer, int interval)
+ throws MonitorException {
+ super(vmid, interval);
+ this.rvm = rvm;
+ pdb = new PerfDataBuffer(rvm, vmid.getLocalVmId());
+ this.listeners = new ArrayList();
+ this.timer = timer;
+ }
+
+ /**
+ * Method to attach to the remote MonitoredVm.
+ */
+ public void attach() throws MonitorException {
+ updateBuffer = pdb.getByteBuffer().duplicate();
+
+ // if continuous sampling is requested, register with the sampler thread
+ if (interval > 0) {
+ samplerTask = new SamplerTask();
+ timer.schedule(samplerTask, 0, interval);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void detach() {
+ try {
+ if (interval > 0) {
+ if (samplerTask != null) {
+ samplerTask.cancel();
+ samplerTask = null;
+ }
+ if (notifierTask != null) {
+ notifierTask.cancel();
+ notifierTask = null;
+ }
+ sample();
+ }
+ } catch (RemoteException e) {
+ // XXX: - use logging api? throw an exception instead?
+ System.err.println("Could not read data for remote JVM " + vmid);
+ e.printStackTrace();
+
+ } finally {
+ super.detach();
+ }
+ }
+
+ /**
+ * Get a copy of the remote instrumentation buffer.
+ *
+ * The data in the remote instrumentation buffer is copied into
+ * a local byte buffer.
+ *
+ * @throws RemoteException Thrown on any communications errors with
+ * the remote system.
+ */
+ public void sample() throws RemoteException {
+ assert updateBuffer != null;
+ ((PerfDataBuffer)pdb).sample(updateBuffer);
+ }
+
+ /**
+ * Get the proxy to the remote MonitoredVm.
+ *
+ * @return RemoteVm - the proxy to the remote MonitoredVm.
+ */
+ public RemoteVm getRemoteVm() {
+ return rvm;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void addVmListener(VmListener l) {
+ synchronized(listeners) {
+ listeners.add(l);
+ if (notifierTask == null) {
+ notifierTask = new NotifierTask();
+ timer.schedule(notifierTask, 0, interval);
+ }
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void removeVmListener(VmListener l) {
+ synchronized(listeners) {
+ listeners.remove(l);
+ if (listeners.isEmpty() && (notifierTask != null)) {
+ notifierTask.cancel();
+ notifierTask = null;
+ }
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void setInterval(int newInterval) {
+ synchronized(listeners) {
+ if (newInterval == interval) {
+ return;
+ }
+
+ int oldInterval = interval;
+ super.setInterval(newInterval);
+
+ if (samplerTask != null) {
+ samplerTask.cancel();
+ SamplerTask oldSamplerTask = samplerTask;
+ samplerTask = new SamplerTask();
+ CountedTimerTaskUtils.reschedule(timer, oldSamplerTask,
+ samplerTask, oldInterval,
+ newInterval);
+ }
+ if (notifierTask != null) {
+ notifierTask.cancel();
+ NotifierTask oldNotifierTask = notifierTask;
+ notifierTask = new NotifierTask();
+ CountedTimerTaskUtils.reschedule(timer, oldNotifierTask,
+ notifierTask, oldInterval,
+ newInterval);
+ }
+ }
+ }
+
+ /**
+ * Fire MonitoredVmStructureChanged events.
+ *
+ * @param inserted List of Monitor objects inserted.
+ * @param removed List of Monitor objects removed.
+ */
+ @SuppressWarnings("unchecked") // Cast of result of clone
+ void fireMonitorStatusChangedEvents(List inserted, List removed) {
+ ArrayList registered = null;
+ MonitorStatusChangeEvent ev = null;
+
+ synchronized(listeners) {
+ registered = (ArrayList)listeners.clone();
+ }
+
+ for (Iterator i = registered.iterator(); i.hasNext(); /* empty */) {
+ VmListener l = i.next();
+ if (ev == null) {
+ ev = new MonitorStatusChangeEvent(this, inserted, removed);
+ }
+ l.monitorStatusChanged(ev);
+ }
+ }
+
+ /**
+ * Fire MonitoredVmStructureChanged events.
+ */
+ @SuppressWarnings("unchecked") // Cast of result of clone
+ void fireMonitorsUpdatedEvents() {
+ ArrayList registered = null;
+ VmEvent ev = null;
+
+ synchronized(listeners) {
+ registered = (ArrayList)listeners.clone();
+ }
+
+ for (Iterator i = registered.iterator(); i.hasNext(); /* empty */) {
+ VmListener l = i.next();
+ if (ev == null) {
+ ev = new VmEvent(this);
+ }
+ l.monitorsUpdated(ev);
+ }
+ }
+
+ /*
+ * Timer Tasks. There are two separate timer tasks here. The SamplerTask
+ * is active whenever we are attached to the remote JVM with a periodic
+ * sampling interval > 0. The NotifierTask is only active if a VmListener
+ * has registered with this RemoteMonitoredVm instance. Also, in the future
+ * we may want to run these tasks at different intervals. Currently,
+ * they run at the same interval and some significant work may
+ * need to be done to complete the separation of these two intervals.
+ */
+
+ /**
+ * Class to periodically check the state of the defined monitors
+ * for the remote MonitoredVm instance and to notify listeners of
+ * any detected changes.
+ */
+ private class NotifierTask extends CountedTimerTask {
+ public void run() {
+ super.run();
+ try {
+ MonitorStatus status = getMonitorStatus();
+
+ List inserted = status.getInserted();
+ List removed = status.getRemoved();
+
+ if (!inserted.isEmpty() || !removed.isEmpty()) {
+ fireMonitorStatusChangedEvents(inserted, removed);
+ }
+ } catch (MonitorException e) {
+ // XXX: use logging api? fire disconnect events? mark errored?
+ // fireDisconnectedEvents();
+ System.err.println("Exception updating monitors for "
+ + getVmIdentifier());
+ e.printStackTrace();
+ // XXX: should we cancle the notifierTask here?
+ // this.cancel();
+ }
+ }
+ }
+
+ /**
+ * Class to periodically sample the remote instrumentation byte buffer
+ * and refresh the local copy. Registered listeners are notified of
+ * the completion of a sampling event.
+ */
+ private class SamplerTask extends CountedTimerTask {
+ public void run() {
+ super.run();
+ try {
+ sample();
+ fireMonitorsUpdatedEvents();
+
+ } catch (RemoteException e) {
+ // XXX: use logging api, mark vm as errored.
+ System.err.println("Exception taking sample for "
+ + getVmIdentifier());
+ e.printStackTrace();
+ this.cancel();
+ }
+ }
+ }
+}