Performance.h   [plain text]

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2012 Intel Inc. All rights reserved.
 * Copyright (C) 2016 Apple Inc. All rights reserved.
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 * this software without specific prior written permission.
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#pragma once

#include "ContextDestructionObserver.h"
#include "DOMHighResTimeStamp.h"
#include "EventTarget.h"
#include "ExceptionOr.h"
#include "GenericTaskQueue.h"
#include <wtf/ListHashSet.h>

namespace WebCore {

class LoadTiming;
class PerformanceEntry;
class PerformanceNavigation;
class PerformanceObserver;
class PerformanceTiming;
class ResourceResponse;
class ResourceTiming;
class ScriptExecutionContext;
class URL;
class UserTiming;

class Performance final : public RefCounted<Performance>, public ContextDestructionObserver, public EventTargetWithInlineData {
public:
    static Ref<Performance> create(ScriptExecutionContext& context, MonotonicTime timeOrigin) { return adoptRef(*new Performance(context, timeOrigin)); }
    ~Performance();

    DOMHighResTimeStamp now() const;

    PerformanceNavigation* navigation();
    PerformanceTiming* timing();

    Vector<RefPtr<PerformanceEntry>> getEntries() const;
    Vector<RefPtr<PerformanceEntry>> getEntriesByType(const String& entryType) const;
    Vector<RefPtr<PerformanceEntry>> getEntriesByName(const String& name, const String& entryType) const;

    void clearResourceTimings();
    void setResourceTimingBufferSize(unsigned);

    ExceptionOr<void> mark(const String& markName);
    void clearMarks(const String& markName);

    ExceptionOr<void> measure(const String& measureName, const String& startMark, const String& endMark);
    void clearMeasures(const String& measureName);

    void addResourceTiming(ResourceTiming&&);

    void removeAllObservers();
    void registerPerformanceObserver(PerformanceObserver&);
    void unregisterPerformanceObserver(PerformanceObserver&);

    static Seconds reduceTimeResolution(Seconds);

    DOMHighResTimeStamp relativeTimeFromTimeOriginInReducedResolution(MonotonicTime) const;

    ScriptExecutionContext* scriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }

    using RefCounted::ref;
    using RefCounted::deref;

private:
    Performance(ScriptExecutionContext&, MonotonicTime timeOrigin);

    void contextDestroyed() override;

    EventTargetInterface eventTargetInterface() const final { return PerformanceEventTargetInterfaceType; }

    void refEventTarget() final { ref(); }
    void derefEventTarget() final { deref(); }

    bool isResourceTimingBufferFull() const;
    void resourceTimingBufferFullTimerFired();

    void queueEntry(PerformanceEntry&);

    mutable RefPtr<PerformanceNavigation> m_navigation;
    mutable RefPtr<PerformanceTiming> m_timing;

    // https://w3c.github.io/resource-timing/#extensions-performance-interface recommends size of 150.
    Vector<RefPtr<PerformanceEntry>> m_resourceTimingBuffer;
    unsigned m_resourceTimingBufferSize { 150 };

    Timer m_resourceTimingBufferFullTimer;
    Vector<RefPtr<PerformanceEntry>> m_backupResourceTimingBuffer;

    // https://w3c.github.io/resource-timing/#dfn-resource-timing-buffer-full-flag
    bool m_resourceTimingBufferFullFlag { false };
    bool m_waitingForBackupBufferToBeProcessed { false };

    MonotonicTime m_timeOrigin;

    std::unique_ptr<UserTiming> m_userTiming;

    GenericTaskQueue<ScriptExecutionContext> m_performanceTimelineTaskQueue;
    ListHashSet<RefPtr<PerformanceObserver>> m_observers;
};

}