--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.jshell/share/classes/jdk/jshell/JDIEventHandler.java Mon Oct 19 19:15:16 2015 +0200
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 1998, 2011, 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;
+ }
+}