Add pause/resume for isolates in vmservice/observatory.

runtime/bin/vmservice/client/lib/src/service/object.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of service;
 
 /// A [ServiceObject] is an object known to the VM service and is tied
 /// to an owning [Isolate].
 abstract class ServiceObject extends Observable {
   /// The owner of this [ServiceObject].  This can be an [Isolate], a
@@ skipping 19 matching lines @@
   @reflectable String get link => isolate.relativeLink(_id);
 
   /// The complete service url of this object with a '#/' prefix.
   // TODO(turnidge): Figure out why using a getter here messes up polymer.
   @reflectable String get hashLink => '#/${link}';
   @reflectable set hashLink(var o) { /* silence polymer */ }
 
   /// Has this object been fully loaded?
   bool get loaded => _loaded;
   bool _loaded = false;
+  // TODO(turnidge): Make loaded observable and get rid of loading
+  // from Isolate.
 
   /// Is this object cacheable?  That is, is it impossible for the [id]
   /// of this object to change?
   bool get canCache => false;
 
   /// Is this object immutable after it is [loaded]?
   bool get immutable => false;
 
   @observable String name;
   @observable String vmName;
@@ skipping 430 matching lines @@
     if (snapshots.length > _historySize) {
       snapshots.removeAt(0);
     }
   }
 }
 
 /// State for a running isolate.
 class Isolate extends ServiceObjectOwner {
   @reflectable VM get vm => owner;
   @reflectable Isolate get isolate => this;
-  @observable ObservableMap counters = toObservable(new ObservableMap());
+  @observable ObservableMap counters = new ObservableMap();
 
   String get link => _id;
   String get hashLink => '#/$_id';
 
-  @observable bool pausedOnStart = false;
-  @observable bool pausedOnExit = false;
+  @observable ServiceMap pauseEvent = null;
+  bool get _isPaused => pauseEvent != null;
+
   @observable bool running = false;
   @observable bool idle = false;
+  @observable bool loading = true;
 
   Map<String,ServiceObject> _cache = new Map<String,ServiceObject>();
   final TagProfile tagProfile = new TagProfile(20);
 
   Isolate._empty(ServiceObjectOwner owner) : super._empty(owner) {
     assert(owner is VM);
   }
 
   /// Creates a link to [id] relative to [this].
   @reflectable String relativeLink(String id) => '${this.id}/$id';
@@ skipping 121 matching lines @@
   @observable DartError error;
 
   void _update(ObservableMap map, bool mapIsRef) {
     mainPort = map['mainPort'];
     name = map['name'];
     vmName = map['name'];
     if (mapIsRef) {
       return;
     }
     _loaded = true;
+    loading = false;
     _upgradeCollection(map, isolate);
     if (map['rootLib'] == null ||
         map['timers'] == null ||
         map['heap'] == null) {
       Logger.root.severe("Malformed 'Isolate' response: $map");
       return;
     }
     rootLib = map['rootLib'];
     if (map['entry'] != null) {
       entry = map['entry'];
@@ skipping 38 matching lines @@
                       timerMap['time_isolate_initialization'] +
                       timerMap['time_bootstrap']);
     timers['dart'] = timerMap['time_dart_execution'];
 
     newHeapUsed = map['heap']['usedNew'];
     oldHeapUsed = map['heap']['usedOld'];
     newHeapCapacity = map['heap']['capacityNew'];
     oldHeapCapacity = map['heap']['capacityOld'];
 
     // Isolate status
-    pausedOnStart = map['pausedOnStart'];
-    pausedOnExit = map['pausedOnExit'];
-    running = map['topFrame'] != null;
-    idle = !pausedOnStart && !pausedOnExit && !running;
+    pauseEvent = map['pauseEvent'];
+    running = (!_isPaused && map['topFrame'] != null);
+    idle = (!_isPaused && map['topFrame'] == null);
     error = map['error'];
 
     libraries.clear();
     for (var lib in map['libraries']) {
       libraries.add(lib);
     }
     libraries.sort((a,b) => a.name.compareTo(b.name));
   }
 
   Future<TagProfile> updateTagProfile() {
@@ skipping 791 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }