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 "nsAutoPtr.h"
#include "nsISupportsImpl.h"

namespace mozilla {
namespace dom {
namespace indexedDB {

class FileManager;

class FileInfo
{
  friend class FileManager;

  ThreadSafeAutoRefCnt mRefCnt;
  ThreadSafeAutoRefCnt mDBRefCnt;
  ThreadSafeAutoRefCnt mSliceRefCnt;

  RefPtr<FileManager> mFileManager;

public:
  class CustomCleanupCallback;

  static
  FileInfo* Create(FileManager* aFileManager, int64_t aId);

  explicit FileInfo(FileManager* aFileManager);

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

  void
  Release(CustomCleanupCallback* aCustomCleanupCallback = nullptr)
  {
    UpdateReferences(mRefCnt, -1, aCustomCleanupCallback);
  }

  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;
  }

  virtual int64_t
  Id() const = 0;

protected:
  virtual ~FileInfo();

private:
  void
  UpdateReferences(ThreadSafeAutoRefCnt& aRefCount,
                   int32_t aDelta,
                   CustomCleanupCallback* aCustomCleanupCallback = nullptr);

  bool
  LockedClearDBRefs();

  void
  Cleanup();
};

class NS_NO_VTABLE FileInfo::CustomCleanupCallback
{
public:
  virtual nsresult
  Cleanup(FileManager* aFileManager, int64_t aId) = 0;

protected:
  CustomCleanupCallback()
  { }
};

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

#endif // mozilla_dom_indexeddb_fileinfo_h__