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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_CheckerboardReportService_h
#define mozilla_dom_CheckerboardReportService_h
#include <string>
#include "js/TypeDecls.h" // for JSContext, JSObject
#include "mozilla/ErrorResult.h" // for ErrorResult
#include "mozilla/StaticPtr.h" // for StaticRefPtr
#include "nsCOMPtr.h" // for nsCOMPtr
#include "nsISupports.h" // for NS_INLINE_DECL_REFCOUNTING
#include "nsWrapperCache.h" // for nsWrapperCache
namespace mozilla {
namespace dom {
struct CheckerboardReport;
}
namespace layers {
// CheckerboardEventStorage is a singleton that stores info on checkerboard
// events, so that they can be accessed from about:checkerboard and visualized.
// Note that this class is NOT threadsafe, and all methods must be called on
// the main thread.
class CheckerboardEventStorage
{
NS_INLINE_DECL_REFCOUNTING(CheckerboardEventStorage)
public:
/**
* Get the singleton instance.
*/
static already_AddRefed<CheckerboardEventStorage> GetInstance();
/**
* Get the stored checkerboard reports.
*/
void GetReports(nsTArray<dom::CheckerboardReport>& aOutReports);
/**
* Save a checkerboard event log, optionally dropping older ones that were
* less severe or less recent. Zero-severity reports may be ignored entirely.
*/
static void Report(uint32_t aSeverity, const std::string& aLog);
private:
/* Stuff for refcounted singleton */
CheckerboardEventStorage() {}
virtual ~CheckerboardEventStorage() {}
static StaticRefPtr<CheckerboardEventStorage> sInstance;
void ReportCheckerboard(uint32_t aSeverity, const std::string& aLog);
private:
/**
* Struct that this class uses internally to store a checkerboard report.
*/
struct CheckerboardReport {
uint32_t mSeverity; // if 0, this report is empty
int64_t mTimestamp; // microseconds since epoch, as from JS_Now()
std::string mLog;
CheckerboardReport()
: mSeverity(0)
, mTimestamp(0)
{}
CheckerboardReport(uint32_t aSeverity, int64_t aTimestamp,
const std::string& aLog)
: mSeverity(aSeverity)
, mTimestamp(aTimestamp)
, mLog(aLog)
{}
};
// The first 5 (indices 0-4) are the most severe ones in decreasing order
// of severity; the next 5 (indices 5-9) are the most recent ones that are
// not already in the "severe" list.
static const int SEVERITY_MAX_INDEX = 5;
static const int RECENT_MAX_INDEX = 10;
CheckerboardReport mCheckerboardReports[RECENT_MAX_INDEX];
};
} // namespace layers
namespace dom {
class GlobalObject;
/**
* CheckerboardReportService is a wrapper object that allows access to the
* stuff in CheckerboardEventStorage (above). We need this wrapper for proper
* garbage/cycle collection, since this can be accessed from JS.
*/
class CheckerboardReportService : public nsWrapperCache
{
public:
/**
* Check if the given page is allowed to access this object via the WebIDL
* bindings. It only returns true if the page is about:checkerboard.
*/
static bool IsEnabled(JSContext* aCtx, JSObject* aGlobal);
/*
* Other standard WebIDL binding glue.
*/
static already_AddRefed<CheckerboardReportService>
Constructor(const dom::GlobalObject& aGlobal, ErrorResult& aRv);
explicit CheckerboardReportService(nsISupports* aSupports);
JSObject* WrapObject(JSContext* aCtx, JS::Handle<JSObject*> aGivenProto) override;
nsISupports* GetParentObject();
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CheckerboardReportService)
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(CheckerboardReportService)
public:
/*
* The methods exposed via the webidl.
*/
void GetReports(nsTArray<dom::CheckerboardReport>& aOutReports);
bool IsRecordingEnabled() const;
void SetRecordingEnabled(bool aEnabled);
void FlushActiveReports();
private:
virtual ~CheckerboardReportService() {}
nsCOMPtr<nsISupports> mParent;
};
} // namespace dom
} // namespace mozilla
#endif /* mozilla_layers_CheckerboardReportService_h */
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