Refactor FakeAttachmentStore

sync/api/attachments/fake_attachment_store.h

-// Copyright 2014 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 SYNC_API_ATTACHMENTS_FAKE_ATTACHMENT_STORE_H_
-#define SYNC_API_ATTACHMENTS_FAKE_ATTACHMENT_STORE_H_
-
-#include <map>
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/stl_util.h"
-#include "sync/api/attachments/attachment_store.h"
-#include "sync/base/sync_export.h"
-
-namespace base {
-class SequencedTaskRunner;
-class SingleThreadTaskRunner;
-}  // namespace base
-
-namespace sync_pb {
-class AttachmentId;
-}  // namespace sync_pb
-
-namespace syncer {
-
-class Attachment;
-
-// A in-memory only implementation of AttachmentStore used for testing.
-//
-// Requires that the current thread has a MessageLoop.
-class SYNC_EXPORT FakeAttachmentStore : public AttachmentStore {
- public:
-  // Construct a FakeAttachmentStore whose "IO" will be performed in
-  // |backend_task_runner|.
-  explicit FakeAttachmentStore(
-      const scoped_refptr<base::SequencedTaskRunner>& backend_task_runner);
-
-  // AttachmentStore implementation.
-  virtual void Read(const AttachmentIdList& id,
-                    const ReadCallback& callback) OVERRIDE;
-  virtual void Write(const AttachmentList& attachments,
-                     const WriteCallback& callback) OVERRIDE;
-  virtual void Drop(const AttachmentIdList& id,
-                    const DropCallback& callback) OVERRIDE;
-
- private:
-  class Backend;
-
-  virtual ~FakeAttachmentStore();
-
-  scoped_refptr<Backend> backend_;
-  scoped_refptr<base::SequencedTaskRunner> backend_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(FakeAttachmentStore);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_API_ATTACHMENTS_FAKE_ATTACHMENT_STORE_H_