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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_APP_RESTORE_FULL_RESTORE_FILE_HANDLER_H_
#define COMPONENTS_APP_RESTORE_FULL_RESTORE_FILE_HANDLER_H_
#include <memory>
#include "base/component_export.h"
#include "base/files/file_path.h"
#include "base/memory/ref_counted_delete_on_sequence.h"
#include "base/task/sequenced_task_runner_helpers.h"
class SequencedTaskRunner;
namespace app_restore {
class RestoreData;
}
namespace full_restore {
// FullRestoreFileHandler is the backend used by FullRestoreSaveHandler and
// RestoreHandler. It reads and writes RestoreData from and to disk.
// FullRestoreFileHandler is created on the main thread, and does no IO by
// the constructor. The real work is done by WriteToFile and ReadFromFile, which
// must be invoked on a background task runner |owning_task_runner|.
class COMPONENT_EXPORT(APP_RESTORE) FullRestoreFileHandler
: public base::RefCountedDeleteOnSequence<FullRestoreFileHandler> {
public:
// Creates a FullRestoreFileHandler. This method is invoked on the main
// thread, and does no IO. |path| is the path of the full restore file.
FullRestoreFileHandler(const base::FilePath& path);
FullRestoreFileHandler(const FullRestoreFileHandler&) = delete;
FullRestoreFileHandler& operator=(const FullRestoreFileHandler&) = delete;
base::SequencedTaskRunner* owning_task_runner() {
return base::RefCountedDeleteOnSequence<
FullRestoreFileHandler>::owning_task_runner();
}
// Writes |restore_data| to the full restore file. This method must be invoked
// on a background task runner |owning_task_runner|.
void WriteToFile(std::unique_ptr<app_restore::RestoreData> restore_data);
// Reads |restore_data| to the full restore file. This method must be invoked
// on a background task runner |owning_task_runner|.
std::unique_ptr<app_restore::RestoreData> ReadFromFile();
private:
friend class base::RefCountedDeleteOnSequence<FullRestoreFileHandler>;
friend class base::DeleteHelper<FullRestoreFileHandler>;
virtual ~FullRestoreFileHandler();
// Performs blocking I/O. Called on a background task runner
// |owning_task_runner|.
void WriteDataBlocking(const std::string& full_restore_data);
// Performs blocking I/O. Called on a background task runner.
// |owning_task_runner|. Returns true on success and false on error. The
// reading result is written to |full_restore_data|.
bool ReadDataBlocking(std::string& full_restore_data);
base::FilePath file_path_;
};
} // namespace full_restore
#endif // COMPONENTS_APP_RESTORE_FULL_RESTORE_FILE_HANDLER_H_
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