зеркало из https://github.com/mozilla/gecko-dev.git
64 строки
2.3 KiB
C++
64 строки
2.3 KiB
C++
/* -*- 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_cache_QuotaClient_h
|
|
#define mozilla_dom_cache_QuotaClient_h
|
|
|
|
#include "mozilla/Attributes.h"
|
|
#include "mozilla/dom/cache/Types.h"
|
|
#include "mozilla/dom/quota/Client.h"
|
|
#include "mozIStorageConnection.h"
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
namespace cache {
|
|
|
|
already_AddRefed<quota::Client>
|
|
CreateQuotaClient();
|
|
|
|
/**
|
|
* The following functions are used to access the directory padding file. The
|
|
* directory padding file lives in DOM Cache base directory
|
|
* (e.g. foo.com/cache/.padding). It is used to keep the current overall padding
|
|
* size for an origin, so that the QuotaManager doesn't need to access the
|
|
* database when getting quota clients' usage.
|
|
*
|
|
* For the directory padding file, it's only accessed on Quota IO thread
|
|
* (for getting current usage) and Cache IO threads (for tracking padding size
|
|
* change). Besides, the padding file is protected by a mutex lock held by
|
|
* CacheQuotaClient.
|
|
*
|
|
* Each padding file should only take 8 bytes (int64_t) to record the overall
|
|
* padding size. Besides, we use the temporary padding file to indicate if the
|
|
* previous action is completed successfully. If the temporary file exists, it
|
|
* represents that the previous action is failed and the content of padding file
|
|
* cannot be trusted, and we need to restore the padding file from the database.
|
|
*/
|
|
|
|
/**
|
|
* Note: The aCommitHook argument will be invoked while a lock is held. Callers
|
|
* should be careful not to pass a hook that might lock on something else and
|
|
* trigger a deadlock.
|
|
*/
|
|
template<typename Callable>
|
|
nsresult
|
|
MaybeUpdatePaddingFile(nsIFile* aBaseDir,
|
|
mozIStorageConnection* aConn,
|
|
const int64_t aIncreaseSize,
|
|
const int64_t aDecreaseSize,
|
|
Callable aCommitHook);
|
|
|
|
nsresult
|
|
RestorePaddingFile(nsIFile* aBaseDir, mozIStorageConnection* aConn);
|
|
|
|
nsresult
|
|
WipePaddingFile(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir);
|
|
} // namespace cache
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_dom_cache_QuotaClient_h
|