third_party/WebKit/Source/core/dom/custom/CustomElementMicrotaskDispatcher.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CustomElementMicrotaskDispatcher_h
   6 #define CustomElementMicrotaskDispatcher_h
   7
   8 #include "platform/heap/Handle.h"
   9 #include "wtf/Noncopyable.h"
  10 #include "wtf/PassOwnPtr.h"
  11 #include "wtf/Vector.h"
  12
  13 namespace blink {
  14
  15 class CustomElementCallbackQueue;
  16
  17 class CustomElementMicrotaskDispatcher final : public NoBaseWillBeGarbageCollected<CustomElementMicrotaskDispatcher> {
  18     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(CustomElementMicrotaskDispatcher);
  19     WTF_MAKE_NONCOPYABLE(CustomElementMicrotaskDispatcher);
  20     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(CustomElementMicrotaskDispatcher);
  21 public:
  22     static CustomElementMicrotaskDispatcher& instance();
  23
  24     void enqueue(CustomElementCallbackQueue*);
  25
  26     bool elementQueueIsEmpty() { return m_elements.isEmpty(); }
  27
  28     DECLARE_TRACE();
  29
  30 private:
  31     CustomElementMicrotaskDispatcher();
  32
  33     void ensureMicrotaskScheduledForElementQueue();
  34     void ensureMicrotaskScheduled();
  35
  36     static void dispatch();
  37     void doDispatch();
  38
  39     bool m_hasScheduledMicrotask;
  40     enum {
  41         Quiescent,
  42         Resolving,
  43         DispatchingCallbacks
  44     } m_phase;
  45
  46     WillBeHeapVector<RawPtrWillBeMember<CustomElementCallbackQueue>> m_elements;
  47 };
  48
  49 } // namespace blink
  50
  51 #endif // CustomElementMicrotaskDispatcher_h