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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <map>
#include "base/callback.h"
#include "base/macros.h"
#include "content/common/content_export.h"
#include "ppapi/c/pp_stdint.h" // For int64_t on Windows.
#include "ppapi/shared_impl/file_growth.h"
#include "storage/browser/fileapi/file_system_context.h"
#include "url/gurl.h"
namespace storage {
class FileSystemURL;
class OpenFileHandle;
class QuotaReservation;
namespace content {
struct QuotaReservationDeleter;
// This class holds a QuotaReservation and manages OpenFileHandles for checking
// quota. It should be created, used, and destroyed on a FileSystemContext's
// default_file_task_runner() instance. This is a RefCountedThreadSafe object
// because it needs to be passed to the file thread and kept alive during
// potentially long-running quota operations.
class CONTENT_EXPORT QuotaReservation
: public base::RefCountedThreadSafe<QuotaReservation,
QuotaReservationDeleter> {
// Static method to facilitate construction on the file task runner.
static scoped_refptr<QuotaReservation> Create(
scoped_refptr<storage::FileSystemContext> file_system_context,
const GURL& origin_url,
storage::FileSystemType file_system_type);
// Opens a file with the given id and path and returns its current size.
int64_t OpenFile(int32_t id, const storage::FileSystemURL& url);
// Closes the file opened by OpenFile with the given id.
void CloseFile(int32_t id, const ppapi::FileGrowth& file_growth);
// Refreshes the quota reservation to a new amount. A map that associates file
// ids with maximum written offsets is provided as input. The callback will
// receive a similar map with the updated file sizes.
typedef base::Callback<void(int64_t, const ppapi::FileSizeMap&)>
void ReserveQuota(int64_t amount,
const ppapi::FileGrowthMap& file_growth,
const ReserveQuotaCallback& callback);
// Notifies underlying QuotaReservation that the associated client crashed,
// and that the reserved quota is no longer traceable.
void OnClientCrash();
friend class base::RefCountedThreadSafe<QuotaReservation,
friend class base::DeleteHelper<QuotaReservation>;
friend struct QuotaReservationDeleter;
friend class QuotaReservationTest;
scoped_refptr<storage::FileSystemContext> file_system_context,
const GURL& origin_url,
storage::FileSystemType file_system_type);
// For unit testing only. A QuotaReservation intended for unit testing will
// have file_system_context_ == NULL.
QuotaReservation(scoped_refptr<storage::QuotaReservation> quota_reservation,
const GURL& origin_url,
storage::FileSystemType file_system_type);
void GotReservedQuota(const ReserveQuotaCallback& callback,
base::File::Error error);
void DeleteOnCorrectThread() const;
scoped_refptr<storage::FileSystemContext> file_system_context_;
scoped_refptr<storage::QuotaReservation> quota_reservation_;
typedef std::map<int32_t, storage::OpenFileHandle*> FileMap;
FileMap files_;
struct QuotaReservationDeleter {
static void Destruct(const QuotaReservation* quota_reservation) {
} // namespace content