blob: 084c46f342c536891afde3ef4904cc064baea537 [file] [log] [blame]
// Copyright (c) 2012 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 "base/macros.h"
#include "storage/browser/blob/blob_data_item.h"
#include "storage/browser/blob/scoped_file.h"
#include "storage/browser/storage_browser_export.h"
namespace storage {
// ShareableFileReference allows consumers to share FileReference for the
// same path if it already exists in its internal map.
// This class is non-thread-safe and all methods must be called on a single
// thread.
class STORAGE_EXPORT ShareableFileReference : public BlobDataItem::DataHandle {
typedef ScopedFile::ScopeOutCallback FinalReleaseCallback;
enum FinalReleasePolicy {
// Returns a ShareableFileReference for the given path, if no reference
// for this path exists returns NULL.
static scoped_refptr<ShareableFileReference> Get(const base::FilePath& path);
// Returns a ShareableFileReference for the given path, creating a new
// reference if none yet exists. If there's a pre-existing reference for
// the path, the policy parameter of this method is ignored.
static scoped_refptr<ShareableFileReference> GetOrCreate(
const base::FilePath& path,
FinalReleasePolicy policy,
base::TaskRunner* file_task_runner);
// Returns a ShareableFileReference for the given path of the |scoped_file|,
// creating a new reference if none yet exists. The ownership of |scoped_file|
// is passed to this reference.
// If there's a pre-existing reference for the path, the scope out policy
// and scope-out-callbacks of the given |scoped_file| is ignored.
// If the given scoped_file has an empty path (e.g. maybe already
// released) this returns NULL reference.
// TODO(kinuko): Make sure if this behavior is ok, we could alternatively
// merge callbacks to the existing one.
static scoped_refptr<ShareableFileReference> GetOrCreate(
ScopedFile scoped_file);
// The full file path.
const base::FilePath& path() const { return scoped_file_.path(); }
// The |callback| is fired when the final reference of this instance
// is released. If release policy is DELETE_ON_FINAL_RELEASE the
// callback task(s) is/are posted before the deletion is scheduled.
void AddFinalReleaseCallback(const FinalReleaseCallback& callback);
ShareableFileReference(ScopedFile scoped_file);
~ShareableFileReference() override;
ScopedFile scoped_file_;
} // namespace storage