Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

runtime/observatory/lib/src/elements/heap_profile.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.
 
 library heap_profile_element;
 
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/app.dart';
 import 'package:observatory/service.dart';
@@ skipping 24 matching lines @@
   var _newPieDataTable;
   var _newPieChart;
 
   // Pie chart of old space usage.
   var _oldPieDataTable;
   var _oldPieChart;
 
   @observable ClassSortedTable classTable;
   var _classTableBody;
 
-  @published ServiceMap profile;
   @published bool autoRefresh = false;
   var _subscription;
 
-  @observable Isolate isolate;
+  @published Isolate isolate;
+  @observable ServiceMap profile;
 
   HeapProfileElement.created() : super.created() {
     // Create pie chart models.
     _newPieDataTable = new DataTable();
     _newPieDataTable.addColumn('string', 'Type');
     _newPieDataTable.addColumn('number', 'Size');
     _oldPieDataTable = new DataTable();
     _oldPieDataTable.addColumn('string', 'Type');
     _oldPieDataTable.addColumn('number', 'Size');
 
@@ skipping 32 matching lines @@
         shadowRoot.querySelector('#newPieChart'));
     _oldPieChart = new Chart('PieChart',
         shadowRoot.querySelector('#oldPieChart'));
     _classTableBody = shadowRoot.querySelector('#classTableBody');
     _subscription = app.vm.events.stream.where(
         (event) => event.isolate == isolate).listen(_onEvent);
   }
 
   @override
   void detached() {
-    _subscription.cancel();
+    _subscription.cancel((){});
     super.detached();
   }
   
   void _onEvent(ServiceEvent event) {
     if (autoRefresh && event.eventType == 'GC') {
       refresh((){});
     }
   }
   
   void _updatePieCharts() {
     assert(profile != null);
     _newPieDataTable.clearRows();
-    var isolate = profile.isolate;
     _newPieDataTable.addRow(['Used', isolate.newSpace.used]);
     _newPieDataTable.addRow(['Free',
         isolate.newSpace.capacity - isolate.newSpace.used]);
     _newPieDataTable.addRow(['External', isolate.newSpace.external]);
     _oldPieDataTable.clearRows();
     _oldPieDataTable.addRow(['Used', isolate.oldSpace.used]);
     _oldPieDataTable.addRow(['Free',
         isolate.oldSpace.capacity - isolate.oldSpace.used]);
     _oldPieDataTable.addRow(['External', isolate.oldSpace.external]);
   }
@@ skipping 126 matching lines @@
         classTable.sortColumnIndex = target.cellIndex;
         classTable.sortDescending = true;
       } else {
         classTable.sortDescending = !classTable.sortDescending;
       }
       classTable.sort();
       _updateClassTableInDom();
     }
   }
 
-  void refresh(var done) {
-    if (profile == null) {
+  void isolateChanged(oldValue) {
+    if (isolate == null) {
+      profile = null;
       return;
     }
-    var isolate = profile.isolate;
-    isolate.get('/allocationprofile').then(_update).whenComplete(done);
+    isolate.invokeRpc('getAllocationProfile', {}).then(_update);
+  }
+
+  void refresh(var done) {
+    if (isolate == null) {
+      return;
+    }
+    isolate.invokeRpc('getAllocationProfile', {})
+        .then(_update).whenComplete(done);
   }
 
   void refreshGC(var done) {
-    if (profile == null) {
+    if (isolate == null) {
       return;
     }
-    var isolate = profile.isolate;
-    isolate.get('/allocationprofile?gc=full').then(_update).whenComplete(done);
+    isolate.invokeRpc('getAllocationProfile', { 'gc': 'full' })
+        .then(_update).whenComplete(done);
   }
 
   void resetAccumulator(var done) {
-    if (profile == null) {
+    if (isolate == null) {
       return;
     }
-    var isolate = profile.isolate;
-    isolate.get('/allocationprofile?reset=true').then(_update).
-                                                 whenComplete(done);
+    isolate.invokeRpc('getAllocationProfile', { 'reset': 'true' })
+        .then(_update).whenComplete(done);
   }
 
   void _update(ServiceMap newProfile) {
     profile = newProfile;
   }
 
   void profileChanged(oldValue) {
     if (profile == null) {
       return;
     }
-    isolate = profile.isolate;
     isolate.updateHeapsFromMap(profile['heaps']);
     var millis = int.parse(profile['dateLastAccumulatorReset']);
     if (millis != 0) {
       lastAccumulatorReset =
               new DateTime.fromMillisecondsSinceEpoch(millis).toString();
     }
     millis = int.parse(profile['dateLastServiceGC']);
     if (millis != 0) {
       lastServiceGC =
               new DateTime.fromMillisecondsSinceEpoch(millis).toString();
     }
     _updatePieCharts();
     _updateClasses();
     _updateClassTable();
     _updateClassTableInDom();
     _drawCharts();
     notifyPropertyChange(#formattedAverage, 0, 1);
     notifyPropertyChange(#formattedTotalCollectionTime, 0, 1);
     notifyPropertyChange(#formattedCollections, 0, 1);
   }
 
   @observable String formattedAverage(bool newSpace) {
     if (profile == null) {
       return '';
     }
-    var heap = newSpace ? profile.isolate.newSpace : profile.isolate.oldSpace;
+    var heap = newSpace ? isolate.newSpace : isolate.oldSpace;
     var avg = ((heap.totalCollectionTimeInSeconds * 1000.0) / heap.collections);
     return '${avg.toStringAsFixed(2)} ms';
   }
 
   @observable String formattedCollections(bool newSpace) {
     if (profile == null) {
       return '';
     }
-    var heap = newSpace ? profile.isolate.newSpace : profile.isolate.oldSpace;
+    var heap = newSpace ? isolate.newSpace : isolate.oldSpace;
     return heap.collections.toString();
   }
 
   @observable String formattedTotalCollectionTime(bool newSpace) {
     if (profile == null) {
       return '';
     }
-    var heap = newSpace ? profile.isolate.newSpace : profile.isolate.oldSpace;
+    var heap = newSpace ? isolate.newSpace : isolate.oldSpace;
     return '${Utils.formatSeconds(heap.totalCollectionTimeInSeconds)} secs';
   }
 }