1 /*
2 * Copyright (c) 1998, 2017, 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.jdi;
27
28 import java.util.ArrayList;
29 import java.util.Collection;
30 import java.util.Iterator;
31 import java.util.NoSuchElementException;
32 import java.util.Spliterator;
33 import java.util.Spliterators;
34
35 import com.sun.jdi.Field;
36 import com.sun.jdi.InternalException;
37 import com.sun.jdi.Locatable;
38 import com.sun.jdi.Location;
39 import com.sun.jdi.Method;
40 import com.sun.jdi.ObjectReference;
41 import com.sun.jdi.ReferenceType;
42 import com.sun.jdi.ThreadReference;
43 import com.sun.jdi.VMDisconnectedException;
44 import com.sun.jdi.Value;
45 import com.sun.jdi.VirtualMachine;
46 import com.sun.jdi.event.AccessWatchpointEvent;
47 import com.sun.jdi.event.BreakpointEvent;
48 import com.sun.jdi.event.ClassPrepareEvent;
49 import com.sun.jdi.event.ClassUnloadEvent;
50 import com.sun.jdi.event.Event;
51 import com.sun.jdi.event.EventIterator;
52 import com.sun.jdi.event.EventSet;
53 import com.sun.jdi.event.ExceptionEvent;
54 import com.sun.jdi.event.MethodEntryEvent;
55 import com.sun.jdi.event.MethodExitEvent;
56 import com.sun.jdi.event.ModificationWatchpointEvent;
57 import com.sun.jdi.event.MonitorContendedEnterEvent;
58 import com.sun.jdi.event.MonitorContendedEnteredEvent;
59 import com.sun.jdi.event.MonitorWaitEvent;
60 import com.sun.jdi.event.MonitorWaitedEvent;
61 import com.sun.jdi.event.StepEvent;
62 import com.sun.jdi.event.ThreadDeathEvent;
63 import com.sun.jdi.event.ThreadStartEvent;
64 import com.sun.jdi.event.VMDeathEvent;
65 import com.sun.jdi.event.VMDisconnectEvent;
66 import com.sun.jdi.event.VMStartEvent;
67 import com.sun.jdi.event.WatchpointEvent;
68 import com.sun.jdi.request.EventRequest;
69
70 enum EventDestination {UNKNOWN_EVENT, INTERNAL_EVENT, CLIENT_EVENT};
71
72 /*
73 * An EventSet is normally created by the transport reader thread when
74 * it reads a JDWP Composite command. The constructor doesn't unpack
75 * the events contained in the Composite command and create EventImpls
76 * for them because that process might involve calling back into the back-end
77 * which should not be done by the transport reader thread. Instead,
78 * the raw bytes of the packet are read and stored in the EventSet.
79 * The EventSet is then added to each EventQueue. When an EventSet is
80 * removed from an EventQueue, the EventSetImpl.build() method is called.
81 * This method reads the packet bytes and creates the actual EventImpl objects.
82 * build() also filters out events for our internal handler and puts them in
83 * their own EventSet. This means that the EventImpls that are in the EventSet
84 * that is on the queues are all for client requests.
85 */
86 public class EventSetImpl extends ArrayList<Event> implements EventSet {
87 private static final long serialVersionUID = -4857338819787924570L;
88 private VirtualMachineImpl vm; // we implement Mirror
89 private Packet pkt;
90 private byte suspendPolicy;
91 private EventSetImpl internalEventSet;
92
93 public String toString() {
94 String string = "event set, policy:" + suspendPolicy +
95 ", count:" + this.size() + " = {";
96 boolean first = true;
97 for (Event event : this) {
98 if (!first) {
99 string += ", ";
100 }
101 string += event.toString();
102 first = false;
103 }
104 string += "}";
105 return string;
106 }
107
108 abstract class EventImpl extends MirrorImpl implements Event {
109
110 private final byte eventCmd;
111 private final int requestID;
112 // This is set only for client requests, not internal requests.
113 private final EventRequest request;
114
115 /**
116 * Constructor for events.
117 */
118 protected EventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
119 int requestID) {
120 super(EventSetImpl.this.vm);
121 this.eventCmd = evt.eventKind();
122 this.requestID = requestID;
123 EventRequestManagerImpl ermi = EventSetImpl.this.
124 vm.eventRequestManagerImpl();
125 this.request = ermi.request(eventCmd, requestID);
126 }
127
128 /*
129 * Override superclass back to default equality
130 */
131 public boolean equals(Object obj) {
132 return this == obj;
133 }
134
135 public int hashCode() {
136 return System.identityHashCode(this);
137 }
138
139 /**
140 * Constructor for VM disconnected events.
141 */
142 protected EventImpl(byte eventCmd) {
143 super(EventSetImpl.this.vm);
144 this.eventCmd = eventCmd;
145 this.requestID = 0;
146 this.request = null;
147 }
148
149 public EventRequest request() {
150 return request;
151 }
152
153 int requestID() {
154 return requestID;
155 }
156
157 EventDestination destination() {
158 /*
159 * We need to decide if this event is for
160 * 1. an internal request
161 * 2. a client request that is no longer available, ie
162 * it has been deleted, or disabled and re-enabled
163 * which gives it a new ID.
164 * 3. a current client request that is disabled
165 * 4. a current enabled client request.
166 *
167 * We will filter this set into a set
168 * that contains only 1s for our internal queue
169 * and a set that contains only 4s for our client queue.
170 * If we get an EventSet that contains only 2 and 3
171 * then we have to resume it if it is not SUSPEND_NONE
172 * because no one else will.
173 */
174 if (requestID == 0) {
175 /* An unsolicited event. These have traditionally
176 * been treated as client events.
177 */
178 return EventDestination.CLIENT_EVENT;
179 }
180
181 // Is this an event for a current client request?
182 if (request == null) {
183 // Nope. Is it an event for an internal request?
184 EventRequestManagerImpl ermi = this.vm.getInternalEventRequestManager();
185 if (ermi.request(eventCmd, requestID) != null) {
186 // Yep
187 return EventDestination.INTERNAL_EVENT;
188 }
189 return EventDestination.UNKNOWN_EVENT;
190 }
191
192 // We found a client request
193 if (request.isEnabled()) {
194 return EventDestination.CLIENT_EVENT;
195 }
196 return EventDestination.UNKNOWN_EVENT;
197 }
198
199 abstract String eventName();
200
201 public String toString() {
202 return eventName();
203 }
204
205 }
206
207 abstract class ThreadedEventImpl extends EventImpl {
208 private ThreadReference thread;
209
210 ThreadedEventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
211 int requestID, ThreadReference thread) {
212 super(evt, requestID);
213 this.thread = thread;
214 }
215
216 public ThreadReference thread() {
217 return thread;
218 }
219
220 public String toString() {
221 return eventName() + " in thread " + thread.name();
222 }
223 }
224
225 abstract class LocatableEventImpl extends ThreadedEventImpl
226 implements Locatable {
227 private Location location;
228
229 LocatableEventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
230 int requestID,
231 ThreadReference thread, Location location) {
232 super(evt, requestID, thread);
233 this.location = location;
234 }
235
236 public Location location() {
237 return location;
238 }
239
240 /**
241 * For MethodEntry and MethodExit
242 */
243 public Method method() {
244 return location.method();
245 }
246
247 public String toString() {
248 return eventName() + "@" +
249 ((location() == null) ? " null" : location().toString()) +
250 " in thread " + thread().name();
251 }
252 }
253
254 class BreakpointEventImpl extends LocatableEventImpl
255 implements BreakpointEvent {
256 BreakpointEventImpl(JDWP.Event.Composite.Events.Breakpoint evt) {
257 super(evt, evt.requestID, evt.thread, evt.location);
258 }
259
260 String eventName() {
261 return "BreakpointEvent";
262 }
263 }
264
265 class StepEventImpl extends LocatableEventImpl implements StepEvent {
266 StepEventImpl(JDWP.Event.Composite.Events.SingleStep evt) {
267 super(evt, evt.requestID, evt.thread, evt.location);
268 }
269
270 String eventName() {
271 return "StepEvent";
272 }
273 }
274
275 class MethodEntryEventImpl extends LocatableEventImpl
276 implements MethodEntryEvent {
277 MethodEntryEventImpl(JDWP.Event.Composite.Events.MethodEntry evt) {
278 super(evt, evt.requestID, evt.thread, evt.location);
279 }
280
281 String eventName() {
282 return "MethodEntryEvent";
283 }
284 }
285
286 class MethodExitEventImpl extends LocatableEventImpl
287 implements MethodExitEvent {
288 private Value returnVal = null;
289
290 MethodExitEventImpl(JDWP.Event.Composite.Events.MethodExit evt) {
291 super(evt, evt.requestID, evt.thread, evt.location);
292 }
293
294 MethodExitEventImpl(JDWP.Event.Composite.Events.MethodExitWithReturnValue evt) {
295 super(evt, evt.requestID, evt.thread, evt.location);
296 returnVal = evt.value;
297 }
298
299 String eventName() {
300 return "MethodExitEvent";
301 }
302
303 public Value returnValue() {
304 if (!this.vm.canGetMethodReturnValues()) {
305 throw new UnsupportedOperationException(
306 "target does not support return values in MethodExit events");
307 }
308 return returnVal;
309 }
310
311 }
312
313 class MonitorContendedEnterEventImpl extends LocatableEventImpl
314 implements MonitorContendedEnterEvent {
315 private ObjectReference monitor = null;
316
317 MonitorContendedEnterEventImpl(JDWP.Event.Composite.Events.MonitorContendedEnter evt) {
318 super(evt, evt.requestID, evt.thread, evt.location);
319 this.monitor = evt.object;
320 }
321
322 String eventName() {
323 return "MonitorContendedEnter";
324 }
325
326 public ObjectReference monitor() {
327 return monitor;
328 };
329
330 }
331
332 class MonitorContendedEnteredEventImpl extends LocatableEventImpl
333 implements MonitorContendedEnteredEvent {
334 private ObjectReference monitor = null;
335
336 MonitorContendedEnteredEventImpl(JDWP.Event.Composite.Events.MonitorContendedEntered evt) {
337 super(evt, evt.requestID, evt.thread, evt.location);
338 this.monitor = evt.object;
339 }
340
341 String eventName() {
342 return "MonitorContendedEntered";
343 }
344
345 public ObjectReference monitor() {
346 return monitor;
347 };
348
349 }
350
351 class MonitorWaitEventImpl extends LocatableEventImpl
352 implements MonitorWaitEvent {
353 private ObjectReference monitor = null;
354 private long timeout;
355
356 MonitorWaitEventImpl(JDWP.Event.Composite.Events.MonitorWait evt) {
357 super(evt, evt.requestID, evt.thread, evt.location);
358 this.monitor = evt.object;
359 this.timeout = evt.timeout;
360 }
361
362 String eventName() {
363 return "MonitorWait";
364 }
365
366 public ObjectReference monitor() {
367 return monitor;
368 };
369
370 public long timeout() {
371 return timeout;
372 }
373 }
374
375 class MonitorWaitedEventImpl extends LocatableEventImpl
376 implements MonitorWaitedEvent {
377 private ObjectReference monitor = null;
378 private boolean timed_out;
379
380 MonitorWaitedEventImpl(JDWP.Event.Composite.Events.MonitorWaited evt) {
381 super(evt, evt.requestID, evt.thread, evt.location);
382 this.monitor = evt.object;
383 this.timed_out = evt.timed_out;
384 }
385
386 String eventName() {
387 return "MonitorWaited";
388 }
389
390 public ObjectReference monitor() {
391 return monitor;
392 };
393
394 public boolean timedout() {
395 return timed_out;
396 }
397 }
398
399 class ClassPrepareEventImpl extends ThreadedEventImpl
400 implements ClassPrepareEvent {
401 private ReferenceType referenceType;
402
403 ClassPrepareEventImpl(JDWP.Event.Composite.Events.ClassPrepare evt) {
404 super(evt, evt.requestID, evt.thread);
405 referenceType = this.vm.referenceType(evt.typeID, evt.refTypeTag,
406 evt.signature);
407 ((ReferenceTypeImpl)referenceType).setStatus(evt.status);
408 }
409
410 public ReferenceType referenceType() {
411 return referenceType;
412 }
413
414 String eventName() {
415 return "ClassPrepareEvent";
416 }
417 }
418
419 class ClassUnloadEventImpl extends EventImpl implements ClassUnloadEvent {
420 private String classSignature;
421
422 ClassUnloadEventImpl(JDWP.Event.Composite.Events.ClassUnload evt) {
423 super(evt, evt.requestID);
424 this.classSignature = evt.signature;
425 }
426
427 public String className() {
428 return classSignature.substring(1, classSignature.length()-1)
429 .replace('/', '.');
430 }
431
432 public String classSignature() {
433 return classSignature;
434 }
435
436 String eventName() {
437 return "ClassUnloadEvent";
438 }
439 }
440
441 class ExceptionEventImpl extends LocatableEventImpl
442 implements ExceptionEvent {
443 private ObjectReference exception;
444 private Location catchLocation;
445
446 ExceptionEventImpl(JDWP.Event.Composite.Events.Exception evt) {
447 super(evt, evt.requestID, evt.thread, evt.location);
448 this.exception = evt.exception;
449 this.catchLocation = evt.catchLocation;
450 }
451
452 public ObjectReference exception() {
453 return exception;
454 }
455
456 public Location catchLocation() {
457 return catchLocation;
458 }
459
460 String eventName() {
461 return "ExceptionEvent";
462 }
463 }
464
465 class ThreadDeathEventImpl extends ThreadedEventImpl
466 implements ThreadDeathEvent {
467 ThreadDeathEventImpl(JDWP.Event.Composite.Events.ThreadDeath evt) {
468 super(evt, evt.requestID, evt.thread);
469 }
470
471 String eventName() {
472 return "ThreadDeathEvent";
473 }
474 }
475
476 class ThreadStartEventImpl extends ThreadedEventImpl
477 implements ThreadStartEvent {
478 ThreadStartEventImpl(JDWP.Event.Composite.Events.ThreadStart evt) {
479 super(evt, evt.requestID, evt.thread);
480 }
481
482 String eventName() {
483 return "ThreadStartEvent";
484 }
485 }
486
487 class VMStartEventImpl extends ThreadedEventImpl
488 implements VMStartEvent {
489 VMStartEventImpl(JDWP.Event.Composite.Events.VMStart evt) {
490 super(evt, evt.requestID, evt.thread);
491 }
492
493 String eventName() {
494 return "VMStartEvent";
495 }
496 }
497
498 class VMDeathEventImpl extends EventImpl implements VMDeathEvent {
499
500 VMDeathEventImpl(JDWP.Event.Composite.Events.VMDeath evt) {
501 super(evt, evt.requestID);
502 }
503
504 String eventName() {
505 return "VMDeathEvent";
506 }
507 }
508
509 class VMDisconnectEventImpl extends EventImpl
510 implements VMDisconnectEvent {
511
512 VMDisconnectEventImpl() {
513 super((byte)JDWP.EventKind.VM_DISCONNECTED);
514 }
515
516 String eventName() {
517 return "VMDisconnectEvent";
518 }
519 }
520
521 abstract class WatchpointEventImpl extends LocatableEventImpl
522 implements WatchpointEvent {
523 private final ReferenceTypeImpl refType;
524 private final long fieldID;
525 private final ObjectReference object;
526 private Field field = null;
527
528 WatchpointEventImpl(JDWP.Event.Composite.Events.EventsCommon evt,
529 int requestID,
530 ThreadReference thread, Location location,
531 byte refTypeTag, long typeID, long fieldID,
532 ObjectReference object) {
533 super(evt, requestID, thread, location);
534 this.refType = this.vm.referenceType(typeID, refTypeTag);
535 this.fieldID = fieldID;
536 this.object = object;
537 }
538
539 public Field field() {
540 if (field == null) {
541 field = refType.getFieldMirror(fieldID);
542 }
543 return field;
544 }
545
546 public ObjectReference object() {
547 return object;
548 }
549
550 public Value valueCurrent() {
551 if (object == null) {
552 return refType.getValue(field());
553 } else {
554 return object.getValue(field());
555 }
556 }
557 }
558
559 class AccessWatchpointEventImpl extends WatchpointEventImpl
560 implements AccessWatchpointEvent {
561
562 AccessWatchpointEventImpl(JDWP.Event.Composite.Events.FieldAccess evt) {
563 super(evt, evt.requestID, evt.thread, evt.location,
564 evt.refTypeTag, evt.typeID, evt.fieldID, evt.object);
565 }
566
567 String eventName() {
568 return "AccessWatchpoint";
569 }
570 }
571
572 class ModificationWatchpointEventImpl extends WatchpointEventImpl
573 implements ModificationWatchpointEvent {
574 Value newValue;
575
576 ModificationWatchpointEventImpl(
577 JDWP.Event.Composite.Events.FieldModification evt) {
578 super(evt, evt.requestID, evt.thread, evt.location,
579 evt.refTypeTag, evt.typeID, evt.fieldID, evt.object);
580 this.newValue = evt.valueToBe;
581 }
582
583 public Value valueToBe() {
584 return newValue;
585 }
586
587 String eventName() {
588 return "ModificationWatchpoint";
589 }
590 }
591
592 /**
593 * Events are constructed on the thread which reads all data from the
594 * transport. This means that the packet cannot be converted to real
595 * JDI objects as that may involve further communications with the
596 * back end which would deadlock.
597 *
598 * Hence the {@link #build()} method below called by EventQueue.
599 */
600 EventSetImpl(VirtualMachine aVm, Packet pkt) {
601 super();
602
603 // From "MirrorImpl":
604 // Yes, its a bit of a hack. But by doing it this
605 // way, this is the only place we have to change
606 // typing to substitute a new impl.
607 vm = (VirtualMachineImpl)aVm;
608
609 this.pkt = pkt;
610 }
611
612 /**
613 * Constructor for special events like VM disconnected
614 */
615 EventSetImpl(VirtualMachine aVm, byte eventCmd) {
616 this(aVm, null);
617 suspendPolicy = JDWP.SuspendPolicy.NONE;
618 switch (eventCmd) {
619 case JDWP.EventKind.VM_DISCONNECTED:
620 addEvent(new VMDisconnectEventImpl());
621 break;
622
623 default:
624 throw new InternalException("Bad singleton event code");
625 }
626 }
627
628 private void addEvent(EventImpl evt) {
629 // Note that this class has a public add method that throws
630 // an exception so that clients can't modify the EventSet
631 super.add(evt);
632 }
633
634 /*
635 * Complete the construction of an EventSet. This is called from
636 * an event handler thread. It upacks the JDWP events inside
637 * the packet and creates EventImpls for them. The EventSet is already
638 * on EventQueues when this is called, so it has to be synch.
639 */
640 synchronized void build() {
641 if (pkt == null) {
642 return;
643 }
644 PacketStream ps = new PacketStream(vm, pkt);
645 JDWP.Event.Composite compEvt = new JDWP.Event.Composite(vm, ps);
646 suspendPolicy = compEvt.suspendPolicy;
647 if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {
648 switch(suspendPolicy) {
649 case JDWP.SuspendPolicy.ALL:
650 vm.printTrace("EventSet: SUSPEND_ALL");
651 break;
652
653 case JDWP.SuspendPolicy.EVENT_THREAD:
654 vm.printTrace("EventSet: SUSPEND_EVENT_THREAD");
655 break;
656
657 case JDWP.SuspendPolicy.NONE:
658 vm.printTrace("EventSet: SUSPEND_NONE");
659 break;
660 }
661 }
662
663 ThreadReference fix6485605 = null;
664 for (int i = 0; i < compEvt.events.length; i++) {
665 EventImpl evt = createEvent(compEvt.events[i]);
666 if ((vm.traceFlags & VirtualMachine.TRACE_EVENTS) != 0) {
667 try {
668 vm.printTrace("Event: " + evt);
669 } catch (VMDisconnectedException ee) {
670 // ignore - see bug 6502716
671 }
672 }
673
674 switch (evt.destination()) {
675 case UNKNOWN_EVENT:
676 // Ignore disabled, deleted, unknown events, but
677 // save the thread if there is one since we might
678 // have to resume it. Note that events for different
679 // threads can't be in the same event set.
680 if (evt instanceof ThreadedEventImpl &&
681 suspendPolicy == JDWP.SuspendPolicy.EVENT_THREAD) {
682 fix6485605 = ((ThreadedEventImpl)evt).thread();
683 }
684 continue;
685 case CLIENT_EVENT:
686 addEvent(evt);
687 break;
688 case INTERNAL_EVENT:
689 if (internalEventSet == null) {
690 internalEventSet = new EventSetImpl(this.vm, null);
691 }
692 internalEventSet.addEvent(evt);
693 break;
694 default:
695 throw new InternalException("Invalid event destination");
696 }
697 }
698 pkt = null; // No longer needed - free it up
699
700 // Avoid hangs described in 6296125, 6293795
701 if (super.size() == 0) {
702 // This set has no client events. If we don't do
703 // needed resumes, no one else is going to.
704 if (suspendPolicy == JDWP.SuspendPolicy.ALL) {
705 vm.resume();
706 } else if (suspendPolicy == JDWP.SuspendPolicy.EVENT_THREAD) {
707 // See bug 6485605.
708 if (fix6485605 != null) {
709 fix6485605.resume();
710 } else {
711 // apparently, there is nothing to resume.
712 }
713 }
714 suspendPolicy = JDWP.SuspendPolicy.NONE;
715
716 }
717
718 }
719
720 /**
721 * Filter out internal events
722 */
723 EventSet userFilter() {
724 return this;
725 }
726
727 /**
728 * Filter out user events.
729 */
730 EventSet internalFilter() {
731 return this.internalEventSet;
732 }
733
734 EventImpl createEvent(JDWP.Event.Composite.Events evt) {
735 JDWP.Event.Composite.Events.EventsCommon comm = evt.aEventsCommon;
736 switch (evt.eventKind) {
737 case JDWP.EventKind.THREAD_START:
738 return new ThreadStartEventImpl(
739 (JDWP.Event.Composite.Events.ThreadStart)comm);
740
741 case JDWP.EventKind.THREAD_END:
742 return new ThreadDeathEventImpl(
743 (JDWP.Event.Composite.Events.ThreadDeath)comm);
744
745 case JDWP.EventKind.EXCEPTION:
746 return new ExceptionEventImpl(
747 (JDWP.Event.Composite.Events.Exception)comm);
748
749 case JDWP.EventKind.BREAKPOINT:
750 return new BreakpointEventImpl(
751 (JDWP.Event.Composite.Events.Breakpoint)comm);
752
753 case JDWP.EventKind.METHOD_ENTRY:
754 return new MethodEntryEventImpl(
755 (JDWP.Event.Composite.Events.MethodEntry)comm);
756
757 case JDWP.EventKind.METHOD_EXIT:
758 return new MethodExitEventImpl(
759 (JDWP.Event.Composite.Events.MethodExit)comm);
760
761 case JDWP.EventKind.METHOD_EXIT_WITH_RETURN_VALUE:
762 return new MethodExitEventImpl(
763 (JDWP.Event.Composite.Events.MethodExitWithReturnValue)comm);
764
765 case JDWP.EventKind.FIELD_ACCESS:
766 return new AccessWatchpointEventImpl(
767 (JDWP.Event.Composite.Events.FieldAccess)comm);
768
769 case JDWP.EventKind.FIELD_MODIFICATION:
770 return new ModificationWatchpointEventImpl(
771 (JDWP.Event.Composite.Events.FieldModification)comm);
772
773 case JDWP.EventKind.SINGLE_STEP:
774 return new StepEventImpl(
775 (JDWP.Event.Composite.Events.SingleStep)comm);
776
777 case JDWP.EventKind.CLASS_PREPARE:
778 return new ClassPrepareEventImpl(
779 (JDWP.Event.Composite.Events.ClassPrepare)comm);
780
781 case JDWP.EventKind.CLASS_UNLOAD:
782 return new ClassUnloadEventImpl(
783 (JDWP.Event.Composite.Events.ClassUnload)comm);
784
785 case JDWP.EventKind.MONITOR_CONTENDED_ENTER:
786 return new MonitorContendedEnterEventImpl(
787 (JDWP.Event.Composite.Events.MonitorContendedEnter)comm);
788
789 case JDWP.EventKind.MONITOR_CONTENDED_ENTERED:
790 return new MonitorContendedEnteredEventImpl(
791 (JDWP.Event.Composite.Events.MonitorContendedEntered)comm);
792
793 case JDWP.EventKind.MONITOR_WAIT:
794 return new MonitorWaitEventImpl(
795 (JDWP.Event.Composite.Events.MonitorWait)comm);
796
797 case JDWP.EventKind.MONITOR_WAITED:
798 return new MonitorWaitedEventImpl(
799 (JDWP.Event.Composite.Events.MonitorWaited)comm);
800
801 case JDWP.EventKind.VM_START:
802 return new VMStartEventImpl(
803 (JDWP.Event.Composite.Events.VMStart)comm);
804
805 case JDWP.EventKind.VM_DEATH:
806 return new VMDeathEventImpl(
807 (JDWP.Event.Composite.Events.VMDeath)comm);
808
809 default:
810 // Ignore unknown event types
811 System.err.println("Ignoring event cmd " +
812 evt.eventKind + " from the VM");
813 return null;
814 }
815 }
816
817 public VirtualMachine virtualMachine() {
818 return vm;
819 }
820
821 public int suspendPolicy() {
822 return EventRequestManagerImpl.JDWPtoJDISuspendPolicy(suspendPolicy);
823 }
824
825 private ThreadReference eventThread() {
826 for (Event event : this) {
827 if (event instanceof ThreadedEventImpl) {
828 return ((ThreadedEventImpl)event).thread();
829 }
830 }
831 return null;
832 }
833
834 public void resume() {
835 switch (suspendPolicy()) {
836 case EventRequest.SUSPEND_ALL:
837 vm.resume();
838 break;
839 case EventRequest.SUSPEND_EVENT_THREAD:
840 ThreadReference thread = eventThread();
841 if (thread == null) {
842 throw new InternalException("Inconsistent suspend policy");
843 }
844 thread.resume();
845 break;
846 case EventRequest.SUSPEND_NONE:
847 // Do nothing
848 break;
849 default:
850 throw new InternalException("Invalid suspend policy");
851 }
852 }
853
854 public Iterator<Event> iterator() {
855 return new Itr();
856 }
857
858 public EventIterator eventIterator() {
859 return new Itr();
860 }
861
862 public class Itr implements EventIterator {
863 /**
864 * Index of element to be returned by subsequent call to next.
865 */
866 int cursor = 0;
867
868 public boolean hasNext() {
869 return cursor != size();
870 }
871
872 public Event next() {
873 try {
874 Event nxt = get(cursor);
875 ++cursor;
876 return nxt;
877 } catch(IndexOutOfBoundsException e) {
878 throw new NoSuchElementException();
879 }
880 }
881
882 public Event nextEvent() {
883 return next();
884 }
885
886 public void remove() {
887 throw new UnsupportedOperationException();
888 }
889 }
890
891 @Override
892 public Spliterator<Event> spliterator() {
893 return Spliterators.spliterator(this, Spliterator.DISTINCT);
894 }
895
896 /* below make this unmodifiable */
897
898 public boolean add(Event o){
899 throw new UnsupportedOperationException();
900 }
901 public boolean remove(Object o) {
902 throw new UnsupportedOperationException();
903 }
904 public boolean addAll(Collection<? extends Event> coll) {
905 throw new UnsupportedOperationException();
906 }
907 public boolean removeAll(Collection<?> coll) {
908 throw new UnsupportedOperationException();
909 }
910 public boolean retainAll(Collection<?> coll) {
911 throw new UnsupportedOperationException();
912 }
913 public void clear() {
914 throw new UnsupportedOperationException();
915 }
916 }