1 /*
2 * Copyright (c) 1999, 2011, 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 /*
27 * This source code is provided to illustrate the usage of a given feature
28 * or technique and has been deliberately simplified. Additional steps
29 * required for a production-quality application, such as security checks,
30 * input validation and proper error handling, might not be present in
31 * this sample code.
32 */
33
34
35 package com.sun.tools.example.debug.bdi;
36
37 import com.sun.jdi.*;
38 import com.sun.jdi.event.*;
39
40 import com.sun.tools.example.debug.event.*;
41
42 import javax.swing.SwingUtilities;
43
44 /**
45 */
46 class JDIEventSource extends Thread {
47
48 private /*final*/ EventQueue queue;
49 private /*final*/ Session session;
50 private /*final*/ ExecutionManager runtime;
51 private final JDIListener firstListener = new FirstListener();
52
53 private boolean wantInterrupt; //### Hack
54
55 /**
56 * Create event source.
57 */
58 JDIEventSource(Session session) {
59 super("JDI Event Set Dispatcher");
60 this.session = session;
61 this.runtime = session.runtime;
62 this.queue = session.vm.eventQueue();
63 }
64
65 @Override
66 public void run() {
67 try {
68 runLoop();
69 } catch (Exception exc) {
70 //### Do something different for InterruptedException???
71 // just exit
72 }
73 session.running = false;
74 }
75
76 private void runLoop() throws InterruptedException {
77 AbstractEventSet es;
78 do {
79 EventSet jdiEventSet = queue.remove();
80 es = AbstractEventSet.toSpecificEventSet(jdiEventSet);
81 session.interrupted = es.suspendedAll();
82 dispatchEventSet(es);
83 } while(!(es instanceof VMDisconnectEventSet));
84 }
85
86 //### Gross foul hackery!
87 private void dispatchEventSet(final AbstractEventSet es) {
88 SwingUtilities.invokeLater(new Runnable() {
89 @Override
90 public void run() {
91 boolean interrupted = es.suspendedAll();
92 es.notify(firstListener);
93 boolean wantInterrupt = JDIEventSource.this.wantInterrupt;
94 for (JDIListener jl : session.runtime.jdiListeners) {
95 es.notify(jl);
96 }
97 if (interrupted && !wantInterrupt) {
98 session.interrupted = false;
99 //### Catch here is a hack
100 try {
101 session.vm.resume();
102 } catch (VMDisconnectedException ee) {}
103 }
104 if (es instanceof ThreadDeathEventSet) {
105 ThreadReference t = ((ThreadDeathEventSet)es).getThread();
106 session.runtime.removeThreadInfo(t);
107 }
108 }
109 });
110 }
111
112 private void finalizeEventSet(AbstractEventSet es) {
113 if (session.interrupted && !wantInterrupt) {
114 session.interrupted = false;
115 //### Catch here is a hack
116 try {
117 session.vm.resume();
118 } catch (VMDisconnectedException ee) {}
119 }
120 if (es instanceof ThreadDeathEventSet) {
121 ThreadReference t = ((ThreadDeathEventSet)es).getThread();
122 session.runtime.removeThreadInfo(t);
123 }
124 }
125
126 //### This is a Hack, deal with it
127 private class FirstListener implements JDIListener {
128
129 @Override
130 public void accessWatchpoint(AccessWatchpointEventSet e) {
131 session.runtime.validateThreadInfo();
132 wantInterrupt = true;
133 }
134
135 @Override
136 public void classPrepare(ClassPrepareEventSet e) {
137 wantInterrupt = false;
138 runtime.resolve(e.getReferenceType());
139 }
140
141 @Override
142 public void classUnload(ClassUnloadEventSet e) {
143 wantInterrupt = false;
144 }
145
146 @Override
147 public void exception(ExceptionEventSet e) {
148 wantInterrupt = true;
149 }
150
151 @Override
152 public void locationTrigger(LocationTriggerEventSet e) {
153 session.runtime.validateThreadInfo();
154 wantInterrupt = true;
155 }
156
157 @Override
158 public void modificationWatchpoint(ModificationWatchpointEventSet e) {
159 session.runtime.validateThreadInfo();
160 wantInterrupt = true;
161 }
162
163 @Override
164 public void threadDeath(ThreadDeathEventSet e) {
165 wantInterrupt = false;
166 }
167
168 @Override
169 public void threadStart(ThreadStartEventSet e) {
170 wantInterrupt = false;
171 }
172
173 @Override
174 public void vmDeath(VMDeathEventSet e) {
175 //### Should have some way to notify user
176 //### that VM died before the session ended.
177 wantInterrupt = false;
178 }
179
180 @Override
181 public void vmDisconnect(VMDisconnectEventSet e) {
182 //### Notify user?
183 wantInterrupt = false;
184 session.runtime.endSession();
185 }
186
187 @Override
188 public void vmStart(VMStartEventSet e) {
189 //### Do we need to do anything with it?
190 wantInterrupt = false;
191 }
192 }
193 }