| /* |
| * Copyright (c) 1998, 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 jdk.jshell; |
| |
| import com.sun.jdi.*; |
| import com.sun.jdi.event.*; |
| |
| /** |
| * Handler of Java Debug Interface events. |
| * Adapted from jdb EventHandler; Handling of events not used by JShell stubbed out. |
| */ |
| class JDIEventHandler implements Runnable { |
| |
| Thread thread; |
| volatile boolean connected = true; |
| boolean completed = false; |
| String shutdownMessageKey; |
| final JDIEnv env; |
| |
| JDIEventHandler(JDIEnv env) { |
| this.env = env; |
| this.thread = new Thread(this, "event-handler"); |
| this.thread.start(); |
| } |
| |
| synchronized void shutdown() { |
| connected = false; // force run() loop termination |
| thread.interrupt(); |
| while (!completed) { |
| try {wait();} catch (InterruptedException exc) {} |
| } |
| } |
| |
| @Override |
| public void run() { |
| EventQueue queue = env.vm().eventQueue(); |
| while (connected) { |
| try { |
| EventSet eventSet = queue.remove(); |
| boolean resumeStoppedApp = false; |
| EventIterator it = eventSet.eventIterator(); |
| while (it.hasNext()) { |
| resumeStoppedApp |= handleEvent(it.nextEvent()); |
| } |
| |
| if (resumeStoppedApp) { |
| eventSet.resume(); |
| } |
| } catch (InterruptedException exc) { |
| // Do nothing. Any changes will be seen at top of loop. |
| } catch (VMDisconnectedException discExc) { |
| handleDisconnectedException(); |
| break; |
| } |
| } |
| synchronized (this) { |
| completed = true; |
| notifyAll(); |
| } |
| } |
| |
| private boolean handleEvent(Event event) { |
| if (event instanceof ExceptionEvent) { |
| exceptionEvent(event); |
| } else if (event instanceof WatchpointEvent) { |
| fieldWatchEvent(event); |
| } else if (event instanceof MethodEntryEvent) { |
| methodEntryEvent(event); |
| } else if (event instanceof MethodExitEvent) { |
| methodExitEvent(event); |
| } else if (event instanceof ClassPrepareEvent) { |
| classPrepareEvent(event); |
| } else if (event instanceof ThreadStartEvent) { |
| threadStartEvent(event); |
| } else if (event instanceof ThreadDeathEvent) { |
| threadDeathEvent(event); |
| } else if (event instanceof VMStartEvent) { |
| vmStartEvent(event); |
| return true; |
| } else { |
| handleExitEvent(event); |
| } |
| return true; |
| } |
| |
| private boolean vmDied = false; |
| |
| private void handleExitEvent(Event event) { |
| if (event instanceof VMDeathEvent) { |
| vmDied = true; |
| shutdownMessageKey = "The application exited"; |
| } else if (event instanceof VMDisconnectEvent) { |
| connected = false; |
| if (!vmDied) { |
| shutdownMessageKey = "The application has been disconnected"; |
| } |
| } else { |
| throw new InternalError("Unexpected event type: " + |
| event.getClass()); |
| } |
| env.shutdown(); |
| } |
| |
| synchronized void handleDisconnectedException() { |
| /* |
| * A VMDisconnectedException has happened while dealing with |
| * another event. We need to flush the event queue, dealing only |
| * with exit events (VMDeath, VMDisconnect) so that we terminate |
| * correctly. |
| */ |
| EventQueue queue = env.vm().eventQueue(); |
| while (connected) { |
| try { |
| EventSet eventSet = queue.remove(); |
| EventIterator iter = eventSet.eventIterator(); |
| while (iter.hasNext()) { |
| handleExitEvent(iter.next()); |
| } |
| } catch (InterruptedException exc) { |
| // ignore |
| } catch (InternalError exc) { |
| // ignore |
| } |
| } |
| } |
| |
| private void vmStartEvent(Event event) { |
| VMStartEvent se = (VMStartEvent)event; |
| } |
| |
| private void methodEntryEvent(Event event) { |
| MethodEntryEvent me = (MethodEntryEvent)event; |
| } |
| |
| private void methodExitEvent(Event event) { |
| MethodExitEvent me = (MethodExitEvent)event; |
| } |
| |
| private void fieldWatchEvent(Event event) { |
| WatchpointEvent fwe = (WatchpointEvent)event; |
| } |
| |
| private void classPrepareEvent(Event event) { |
| ClassPrepareEvent cle = (ClassPrepareEvent)event; |
| } |
| |
| private void exceptionEvent(Event event) { |
| ExceptionEvent ee = (ExceptionEvent)event; |
| } |
| |
| private void threadDeathEvent(Event event) { |
| ThreadDeathEvent tee = (ThreadDeathEvent)event; |
| } |
| |
| private void threadStartEvent(Event event) { |
| ThreadStartEvent tse = (ThreadStartEvent)event; |
| } |
| } |