gecko-dev/dom/indexedDB/FileInfo.h

/* -*- 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_dom_indexeddb_fileinfo_h__
#define mozilla_dom_indexeddb_fileinfo_h__

#include "nsISupportsImpl.h"

namespace mozilla {
namespace dom {
namespace indexedDB {

class FileManager;

class FileInfo final {
  template <typename FileManager, typename IndexedDatabaseManager>
  friend class FileManagerBase;

  const int64_t mFileId;

  ThreadSafeAutoRefCnt mRefCnt;
  ThreadSafeAutoRefCnt mDBRefCnt;
  ThreadSafeAutoRefCnt mSliceRefCnt;

  const RefPtr<FileManager> mFileManager;

 public:
  FileInfo(RefPtr<FileManager> aFileManager, const int64_t aFileId,
           const nsrefcnt aInitialDBRefCnt = 0)
      : mFileId(aFileId),
        mDBRefCnt(aInitialDBRefCnt),
        mFileManager(std::move(aFileManager)) {
    MOZ_ASSERT(mFileManager);
    MOZ_ASSERT(mFileId > 0);
  }

  void AddRef() { UpdateReferences(mRefCnt, 1); }

  void Release(const bool aSyncDeleteFile = false) {
    UpdateReferences(mRefCnt, -1, aSyncDeleteFile);
  }

  void UpdateDBRefs(int32_t aDelta) { UpdateReferences(mDBRefCnt, aDelta); }

  void UpdateSliceRefs(int32_t aDelta) {
    UpdateReferences(mSliceRefCnt, aDelta);
  }

  void GetReferences(int32_t* aRefCnt, int32_t* aDBRefCnt,
                     int32_t* aSliceRefCnt);

  FileManager* Manager() const { return mFileManager; }

  int64_t Id() const { return mFileId; }

  nsCOMPtr<nsIFile> GetFileForFileInfo() const;

 private:
  void UpdateReferences(ThreadSafeAutoRefCnt& aRefCount, int32_t aDelta,
                        bool aSyncDeleteFile = false);

  bool LockedClearDBRefs();

  void Cleanup();
};

}  // namespace indexedDB
}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_indexeddb_fileinfo_h__