Centralized event streams

runtime/observatory/lib/src/elements/isolate_ref.dart

 // Copyright (c) 2013, 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 isolate_ref_element;
 
 import 'dart:html';
 import 'dart:async';
 import 'package:observatory/models.dart' as M
-  show IsolateRef, IsolateUpdateEvent;
+  show IsolateRef, EventRepository;
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/helpers/uris.dart';
 
 class IsolateRefElement extends HtmlElement implements Renderable {
   static const tag = const Tag<IsolateRefElement>('isolate-ref-wrapped');
 
   RenderingScheduler<IsolateRefElement> _r;
 
   Stream<RenderedEvent<IsolateRefElement>> get onRendered => _r.onRendered;
 
-  Stream<M.IsolateUpdateEvent> _updates;
+
+  M.IsolateRef _isolate;
+  M.EventRepository _events;
   StreamSubscription _updatesSubscription;
-  M.IsolateRef _isolate;
 
   M.IsolateRef get isolate => _isolate;
 
-  factory IsolateRefElement(M.IsolateRef isolate,
-      Stream<M.IsolateUpdateEvent> updates, {RenderingQueue queue}) {
+  factory IsolateRefElement(M.IsolateRef isolate, M.EventRepository events,
+      {RenderingQueue queue}) {
     assert(isolate != null);
-    assert(updates != null);
+    assert(events != null);
     IsolateRefElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._isolate = isolate;
-    e._updates = updates;
+    e._events = events;
     return e;
   }
 
   IsolateRefElement.created() : super.created();
 
   @override
   void attached() {
     super.attached();
-    assert(_isolate != null);
-    assert(_updates != null);
+    _updatesSubscription = _events.onIsolateUpdate
+      .where((e) => e.isolate.id == isolate.id)
+      .listen((e) { _isolate = e.isolate; _r.dirty(); });
     _r.enable();
-    _updatesSubscription = _updates
-      .where((M.IsolateUpdateEvent e) => e.isolate.id == isolate.id)
-      .listen((M.IsolateUpdateEvent e) { _isolate = e.isolate; _r.dirty(); });
   }
 
   @override
   void detached() {
-    super.detached(); _r.disable(notify: true);
+    super.detached();
     children = [];
-    assert(_updatesSubscription != null);
+    _r.disable(notify: true);
     _updatesSubscription.cancel();
-    _updatesSubscription = null;
   }
 
   void render() {
     children = [
       new AnchorElement(href: Uris.inspect(isolate))
         ..text = 'Isolate ${isolate.number} (${isolate.name})'
         ..classes = ['isolate-ref']
     ];
   }
 }