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      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 WebCore {
     14 
     15 class CustomElementCallbackQueue;
     16 class CustomElementMicrotaskImportStep;
     17 class CustomElementMicrotaskStep;
     18 class CustomElementMicrotaskStepDispatcher;
     19 class HTMLImportLoader;
     20 
     21 class CustomElementMicrotaskDispatcher FINAL : public NoBaseWillBeGarbageCollected<CustomElementMicrotaskDispatcher> {
     22     WTF_MAKE_NONCOPYABLE(CustomElementMicrotaskDispatcher);
     23     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(CustomElementMicrotaskDispatcher);
     24 public:
     25     static CustomElementMicrotaskDispatcher& instance();
     26 
     27     void enqueue(HTMLImportLoader* parentLoader, PassOwnPtrWillBeRawPtr<CustomElementMicrotaskStep>);
     28     void enqueue(HTMLImportLoader* parentLoader, PassOwnPtrWillBeRawPtr<CustomElementMicrotaskImportStep>, bool importIsSync);
     29 
     30     void enqueue(CustomElementCallbackQueue*);
     31 
     32 
     33     void importDidFinish(CustomElementMicrotaskImportStep*);
     34 
     35     bool elementQueueIsEmpty() { return m_elements.isEmpty(); }
     36 
     37     void trace(Visitor*);
     38 
     39 #if !defined(NDEBUG)
     40     void show();
     41 #endif
     42 
     43 private:
     44     CustomElementMicrotaskDispatcher();
     45 
     46     void ensureMicrotaskScheduledForElementQueue();
     47     void ensureMicrotaskScheduledForMicrotaskSteps();
     48     void ensureMicrotaskScheduled();
     49 
     50     static void dispatch();
     51     void doDispatch();
     52 
     53     bool m_hasScheduledMicrotask;
     54     enum {
     55         Quiescent,
     56         Resolving,
     57         DispatchingCallbacks
     58     } m_phase;
     59 
     60     RefPtrWillBeMember<CustomElementMicrotaskStepDispatcher> m_steps;
     61     WillBeHeapVector<RawPtrWillBeMember<CustomElementCallbackQueue> > m_elements;
     62 };
     63 
     64 }
     65 
     66 #if !defined(NDEBUG)
     67 void showCEMD();
     68 #endif
     69 
     70 #endif // CustomElementMicrotaskDispatcher_h
     71