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// 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.
#ifndef WEBKIT_BLOB_SHAREABLE_FILE_REFERENCE_H_
#define WEBKIT_BLOB_SHAREABLE_FILE_REFERENCE_H_
#include <vector>
#include "base/callback.h"
#include "base/file_path.h"
#include "base/memory/ref_counted.h"
#include "webkit/blob/blob_export.h"
namespace base {
class TaskRunner;
}
namespace webkit_blob {
// A refcounted wrapper around a FilePath that can optionally schedule
// the file to be deleted upon final release and/or to notify a consumer
// when final release occurs. This class is single-threaded and should
// only be invoked on the IO thread in chrome.
class BLOB_EXPORT ShareableFileReference
: public base::RefCounted<ShareableFileReference> {
public:
typedef base::Callback<void(const FilePath&)> FinalReleaseCallback;
enum FinalReleasePolicy {
DELETE_ON_FINAL_RELEASE,
DONT_DELETE_ON_FINAL_RELEASE,
};
// Returns a ShareableFileReference for the given path, if no reference
// for this path exists returns NULL.
static scoped_refptr<ShareableFileReference> Get(const 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 deletable parameter of this method is ignored.
static scoped_refptr<ShareableFileReference> GetOrCreate(
const FilePath& path,
FinalReleasePolicy policy,
base::TaskRunner* file_task_runner);
// The full file path.
const FilePath& path() const { return path_; }
// Whether it's to be deleted on final release.
FinalReleasePolicy final_release_policy() const {
return final_release_policy_;
}
void AddFinalReleaseCallback(const FinalReleaseCallback& callback);
private:
friend class base::RefCounted<ShareableFileReference>;
ShareableFileReference(
const FilePath& path,
FinalReleasePolicy policy,
base::TaskRunner* file_task_runner);
~ShareableFileReference();
const FilePath path_;
const FinalReleasePolicy final_release_policy_;
const scoped_refptr<base::TaskRunner> file_task_runner_;
std::vector<FinalReleaseCallback> final_release_callbacks_;
DISALLOW_COPY_AND_ASSIGN(ShareableFileReference);
};
} // namespace webkit_blob
#endif // WEBKIT_BLOB_SHAREABLE_FILE_REFERENCE_H_
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