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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2008, 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 com.sun.tools.example.debug.tty; | |
| 27 | + | |
| 28 | +import com.sun.jdi.*; | |
| 29 | +import com.sun.jdi.event.*; | |
| 30 | +import com.sun.jdi.request.EventRequest; | |
| 31 | + | |
| 32 | +public class EventHandler implements Runnable { | |
| 33 | + | |
| 34 | + EventNotifier notifier; | |
| 35 | + Thread thread; | |
| 36 | + volatile boolean connected = true; | |
| 37 | + boolean completed = false; | |
| 38 | + String shutdownMessageKey; | |
| 39 | + boolean stopOnVMStart; | |
| 40 | + | |
| 41 | + EventHandler(EventNotifier notifier, boolean stopOnVMStart) { | |
| 42 | + this.notifier = notifier; | |
| 43 | + this.stopOnVMStart = stopOnVMStart; | |
| 44 | + this.thread = new Thread(this, "event-handler"); | |
| 45 | + this.thread.start(); | |
| 46 | + } | |
| 47 | + | |
| 48 | + synchronized void shutdown() { | |
| 49 | + connected = false; // force run() loop termination | |
| 50 | + thread.interrupt(); | |
| 51 | + while (!completed) { | |
| 52 | + try {wait();} catch (InterruptedException exc) {} | |
| 53 | + } | |
| 54 | + } | |
| 55 | + | |
| 56 | + @Override | |
| 57 | + public void run() { | |
| 58 | + EventQueue queue = Env.vm().eventQueue(); | |
| 59 | + while (connected) { | |
| 60 | + try { | |
| 61 | + EventSet eventSet = queue.remove(); | |
| 62 | + boolean resumeStoppedApp = false; | |
| 63 | + EventIterator it = eventSet.eventIterator(); | |
| 64 | + while (it.hasNext()) { | |
| 65 | + resumeStoppedApp |= !handleEvent(it.nextEvent()); | |
| 66 | + } | |
| 67 | + | |
| 68 | + if (resumeStoppedApp) { | |
| 69 | + eventSet.resume(); | |
| 70 | + } else if (eventSet.suspendPolicy() == EventRequest.SUSPEND_ALL) { | |
| 71 | + setCurrentThread(eventSet); | |
| 72 | + notifier.vmInterrupted(); | |
| 73 | + } | |
| 74 | + } catch (InterruptedException exc) { | |
| 75 | + // Do nothing. Any changes will be seen at top of loop. | |
| 76 | + } catch (VMDisconnectedException discExc) { | |
| 77 | + handleDisconnectedException(); | |
| 78 | + break; | |
| 79 | + } | |
| 80 | + } | |
| 81 | + synchronized (this) { | |
| 82 | + completed = true; | |
| 83 | + notifyAll(); | |
| 84 | + } | |
| 85 | + } | |
| 86 | + | |
| 87 | + private boolean handleEvent(Event event) { | |
| 88 | + notifier.receivedEvent(event); | |
| 89 | + | |
| 90 | + if (event instanceof ExceptionEvent) { | |
| 91 | + return exceptionEvent(event); | |
| 92 | + } else if (event instanceof BreakpointEvent) { | |
| 93 | + return breakpointEvent(event); | |
| 94 | + } else if (event instanceof WatchpointEvent) { | |
| 95 | + return fieldWatchEvent(event); | |
| 96 | + } else if (event instanceof StepEvent) { | |
| 97 | + return stepEvent(event); | |
| 98 | + } else if (event instanceof MethodEntryEvent) { | |
| 99 | + return methodEntryEvent(event); | |
| 100 | + } else if (event instanceof MethodExitEvent) { | |
| 101 | + return methodExitEvent(event); | |
| 102 | + } else if (event instanceof ClassPrepareEvent) { | |
| 103 | + return classPrepareEvent(event); | |
| 104 | + } else if (event instanceof ClassUnloadEvent) { | |
| 105 | + return classUnloadEvent(event); | |
| 106 | + } else if (event instanceof ThreadStartEvent) { | |
| 107 | + return threadStartEvent(event); | |
| 108 | + } else if (event instanceof ThreadDeathEvent) { | |
| 109 | + return threadDeathEvent(event); | |
| 110 | + } else if (event instanceof VMStartEvent) { | |
| 111 | + return vmStartEvent(event); | |
| 112 | + } else { | |
| 113 | + return handleExitEvent(event); | |
| 114 | + } | |
| 115 | + } | |
| 116 | + | |
| 117 | + private boolean vmDied = false; | |
| 118 | + private boolean handleExitEvent(Event event) { | |
| 119 | + if (event instanceof VMDeathEvent) { | |
| 120 | + vmDied = true; | |
| 121 | + return vmDeathEvent(event); | |
| 122 | + } else if (event instanceof VMDisconnectEvent) { | |
| 123 | + connected = false; | |
| 124 | + if (!vmDied) { | |
| 125 | + vmDisconnectEvent(event); | |
| 126 | + } | |
| 127 | + Env.shutdown(shutdownMessageKey); | |
| 128 | + return false; | |
| 129 | + } else { | |
| 130 | + throw new InternalError(MessageOutput.format("Unexpected event type", | |
| 131 | + new Object[] {event.getClass()})); | |
| 132 | + } | |
| 133 | + } | |
| 134 | + | |
| 135 | + synchronized void handleDisconnectedException() { | |
| 136 | + /* | |
| 137 | + * A VMDisconnectedException has happened while dealing with | |
| 138 | + * another event. We need to flush the event queue, dealing only | |
| 139 | + * with exit events (VMDeath, VMDisconnect) so that we terminate | |
| 140 | + * correctly. | |
| 141 | + */ | |
| 142 | + EventQueue queue = Env.vm().eventQueue(); | |
| 143 | + while (connected) { | |
| 144 | + try { | |
| 145 | + EventSet eventSet = queue.remove(); | |
| 146 | + EventIterator iter = eventSet.eventIterator(); | |
| 147 | + while (iter.hasNext()) { | |
| 148 | + handleExitEvent(iter.next()); | |
| 149 | + } | |
| 150 | + } catch (InterruptedException exc) { | |
| 151 | + // ignore | |
| 152 | + } catch (InternalError exc) { | |
| 153 | + // ignore | |
| 154 | + } | |
| 155 | + } | |
| 156 | + } | |
| 157 | + | |
| 158 | + private ThreadReference eventThread(Event event) { | |
| 159 | + if (event instanceof ClassPrepareEvent) { | |
| 160 | + return ((ClassPrepareEvent)event).thread(); | |
| 161 | + } else if (event instanceof LocatableEvent) { | |
| 162 | + return ((LocatableEvent)event).thread(); | |
| 163 | + } else if (event instanceof ThreadStartEvent) { | |
| 164 | + return ((ThreadStartEvent)event).thread(); | |
| 165 | + } else if (event instanceof ThreadDeathEvent) { | |
| 166 | + return ((ThreadDeathEvent)event).thread(); | |
| 167 | + } else if (event instanceof VMStartEvent) { | |
| 168 | + return ((VMStartEvent)event).thread(); | |
| 169 | + } else { | |
| 170 | + return null; | |
| 171 | + } | |
| 172 | + } | |
| 173 | + | |
| 174 | + private void setCurrentThread(EventSet set) { | |
| 175 | + ThreadReference thread; | |
| 176 | + if (set.size() > 0) { | |
| 177 | + /* | |
| 178 | + * If any event in the set has a thread associated with it, | |
| 179 | + * they all will, so just grab the first one. | |
| 180 | + */ | |
| 181 | + Event event = set.iterator().next(); // Is there a better way? | |
| 182 | + thread = eventThread(event); | |
| 183 | + } else { | |
| 184 | + thread = null; | |
| 185 | + } | |
| 186 | + setCurrentThread(thread); | |
| 187 | + } | |
| 188 | + | |
| 189 | + private void setCurrentThread(ThreadReference thread) { | |
| 190 | + ThreadInfo.invalidateAll(); | |
| 191 | + ThreadInfo.setCurrentThread(thread); | |
| 192 | + } | |
| 193 | + | |
| 194 | + private boolean vmStartEvent(Event event) { | |
| 195 | + VMStartEvent se = (VMStartEvent)event; | |
| 196 | + notifier.vmStartEvent(se); | |
| 197 | + return stopOnVMStart; | |
| 198 | + } | |
| 199 | + | |
| 200 | + private boolean breakpointEvent(Event event) { | |
| 201 | + BreakpointEvent be = (BreakpointEvent)event; | |
| 202 | + notifier.breakpointEvent(be); | |
| 203 | + return true; | |
| 204 | + } | |
| 205 | + | |
| 206 | + private boolean methodEntryEvent(Event event) { | |
| 207 | + MethodEntryEvent me = (MethodEntryEvent)event; | |
| 208 | + notifier.methodEntryEvent(me); | |
| 209 | + return true; | |
| 210 | + } | |
| 211 | + | |
| 212 | + private boolean methodExitEvent(Event event) { | |
| 213 | + MethodExitEvent me = (MethodExitEvent)event; | |
| 214 | + return notifier.methodExitEvent(me); | |
| 215 | + } | |
| 216 | + | |
| 217 | + private boolean fieldWatchEvent(Event event) { | |
| 218 | + WatchpointEvent fwe = (WatchpointEvent)event; | |
| 219 | + notifier.fieldWatchEvent(fwe); | |
| 220 | + return true; | |
| 221 | + } | |
| 222 | + | |
| 223 | + private boolean stepEvent(Event event) { | |
| 224 | + StepEvent se = (StepEvent)event; | |
| 225 | + notifier.stepEvent(se); | |
| 226 | + return true; | |
| 227 | + } | |
| 228 | + | |
| 229 | + private boolean classPrepareEvent(Event event) { | |
| 230 | + ClassPrepareEvent cle = (ClassPrepareEvent)event; | |
| 231 | + notifier.classPrepareEvent(cle); | |
| 232 | + | |
| 233 | + if (!Env.specList.resolve(cle)) { | |
| 234 | + MessageOutput.lnprint("Stopping due to deferred breakpoint errors."); | |
| 235 | + return true; | |
| 236 | + } else { | |
| 237 | + return false; | |
| 238 | + } | |
| 239 | + } | |
| 240 | + | |
| 241 | + private boolean classUnloadEvent(Event event) { | |
| 242 | + ClassUnloadEvent cue = (ClassUnloadEvent)event; | |
| 243 | + notifier.classUnloadEvent(cue); | |
| 244 | + return false; | |
| 245 | + } | |
| 246 | + | |
| 247 | + private boolean exceptionEvent(Event event) { | |
| 248 | + ExceptionEvent ee = (ExceptionEvent)event; | |
| 249 | + notifier.exceptionEvent(ee); | |
| 250 | + return true; | |
| 251 | + } | |
| 252 | + | |
| 253 | + private boolean threadDeathEvent(Event event) { | |
| 254 | + ThreadDeathEvent tee = (ThreadDeathEvent)event; | |
| 255 | + ThreadInfo.removeThread(tee.thread()); | |
| 256 | + return false; | |
| 257 | + } | |
| 258 | + | |
| 259 | + private boolean threadStartEvent(Event event) { | |
| 260 | + ThreadStartEvent tse = (ThreadStartEvent)event; | |
| 261 | + ThreadInfo.addThread(tse.thread()); | |
| 262 | + notifier.threadStartEvent(tse); | |
| 263 | + return false; | |
| 264 | + } | |
| 265 | + | |
| 266 | + public boolean vmDeathEvent(Event event) { | |
| 267 | + shutdownMessageKey = "The application exited"; | |
| 268 | + notifier.vmDeathEvent((VMDeathEvent)event); | |
| 269 | + return false; | |
| 270 | + } | |
| 271 | + | |
| 272 | + public boolean vmDisconnectEvent(Event event) { | |
| 273 | + shutdownMessageKey = "The application has been disconnected"; | |
| 274 | + notifier.vmDisconnectEvent((VMDisconnectEvent)event); | |
| 275 | + return false; | |
| 276 | + } | |
| 277 | +} | |