third_party/WebKit/Source/core/timing/PerformanceObserver.h

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef PerformanceObserver_h
#define PerformanceObserver_h

#include "bindings/core/v8/TraceWrapperMember.h"
#include "core/CoreExport.h"
#include "core/timing/PerformanceEntry.h"
#include "platform/heap/Handle.h"
#include "wtf/Vector.h"

namespace blink {

class ExecutionContext;
class ExceptionState;
class PerformanceBase;
class PerformanceObserver;
class PerformanceObserverCallback;
class PerformanceObserverInit;

using PerformanceEntryVector = HeapVector<Member<PerformanceEntry>>;

class CORE_EXPORT PerformanceObserver final
    : public GarbageCollected<PerformanceObserver>,
      public ScriptWrappable {
  DEFINE_WRAPPERTYPEINFO();
  friend class PerformanceBase;
  friend class PerformanceBaseTest;
  friend class PerformanceObserverTest;

 public:
  static PerformanceObserver* create(ExecutionContext*,
                                     PerformanceBase*,
                                     PerformanceObserverCallback*);
  static void resumeSuspendedObservers();

  void observe(const PerformanceObserverInit&, ExceptionState&);
  void disconnect();
  void enqueuePerformanceEntry(PerformanceEntry&);
  PerformanceEntryTypeMask filterOptions() const { return m_filterOptions; }

  DECLARE_TRACE();
  DECLARE_TRACE_WRAPPERS();

 private:
  PerformanceObserver(ExecutionContext*,
                      PerformanceBase*,
                      PerformanceObserverCallback*);
  void deliver();
  bool shouldBeSuspended() const;

  Member<ExecutionContext> m_executionContext;
  TraceWrapperMember<PerformanceObserverCallback> m_callback;
  WeakMember<PerformanceBase> m_performance;
  PerformanceEntryVector m_performanceEntries;
  PerformanceEntryTypeMask m_filterOptions;
  bool m_isRegistered;
};

}  // namespace blink

#endif  // PerformanceObserver_h