SharedStyleSheetCache.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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_SharedStyleSheetCache_h__

#define mozilla_SharedStyleSheetCache_h__

// The shared style sheet cache is a cache that allows us to share sheets across

// documents.

//

// It's generally a singleton, but it is different from GlobalStyleSheetCache in

// the sense that:

//

//  * It needs to be cycle-collectable, as it can keep alive style sheets from

//    various documents.

//

//  * It is conceptually a singleton, but given its cycle-collectable nature, we

//    might re-create it.

#include "mozilla/SharedSubResourceCache.h"

#include "nsRefPtrHashtable.h"

#include "mozilla/MemoryReporting.h"

#include "mozilla/css/Loader.h"

namespace mozilla {

class StyleSheet;

class SheetLoadDataHashKey;

namespace css {

class SheetLoadData;

class Loader;

}  // namespace css

struct SharedStyleSheetCacheTraits {

  using Loader = css::Loader;

  using Key = SheetLoadDataHashKey;

  using Value = StyleSheet;

  using LoadingValue = css::SheetLoadData;

  static SheetLoadDataHashKey KeyFromLoadingValue(const LoadingValue& aValue) {

    return SheetLoadDataHashKey(aValue);

};

class SharedStyleSheetCache final

    : public SharedSubResourceCache<SharedStyleSheetCacheTraits,

                                    SharedStyleSheetCache>,

      public nsIMemoryReporter {

 public:

  using Base = SharedSubResourceCache<SharedStyleSheetCacheTraits,

                                      SharedStyleSheetCache>;

  NS_DECL_ISUPPORTS

  NS_DECL_NSIMEMORYREPORTER

  SharedStyleSheetCache();

  void Init();

  // This has to be static because it's also called for loaders that don't have

  // a sheet cache (loaders that are not owned by a document).

  static void LoadCompleted(SharedStyleSheetCache*, css::SheetLoadData&,

                            nsresult);

  using Base::LoadCompleted;

  static void LoadCompletedInternal(SharedStyleSheetCache*, css::SheetLoadData&,

                                    nsTArray<RefPtr<css::SheetLoadData>>&);

  static void Clear(nsIPrincipal* aForPrincipal = nullptr,

                    const nsACString* aBaseDomain = nullptr);

 protected:

  void InsertIfNeeded(css::SheetLoadData&);

  ~SharedStyleSheetCache();

};

}  // namespace mozilla

#endif