1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_OWNERSHIP_STATUS_CHECKER_H_
6#define CHROME_BROWSER_CHROMEOS_LOGIN_OWNERSHIP_STATUS_CHECKER_H_
7#pragma once
8
9#include "base/basictypes.h"
10#include "base/callback.h"
11#include "base/memory/ref_counted.h"
12#include "base/memory/scoped_ptr.h"
13#include "base/message_loop_proxy.h"
14#include "chrome/browser/chromeos/login/ownership_service.h"
15
16namespace chromeos {
17
18// A helper that does ownership checking on the file thread and reports back the
19// result on whatever thread the call was made on. The pattern is to construct
20// a checker, passing in the callback. Once the check is done, the callback will
21// be invoked with the result. In order to cancel the callback, just destroy the
22// checker object.
23class OwnershipStatusChecker {
24 public:
25  // Callback function type. The status code is guaranteed to be different from
26  // OWNERSHIP_UNKNOWN.
27  typedef Callback1<OwnershipService::Status>::Type Callback;
28
29  explicit OwnershipStatusChecker(Callback* callback);
30  ~OwnershipStatusChecker();
31
32 private:
33  // The refcounted core that handles the thread switching.
34  class Core : public base::RefCountedThreadSafe<Core> {
35   public:
36    explicit Core(Callback* callback);
37
38    // Starts the check.
39    void Check();
40
41    // Cancels the outstanding callback (if applicable).
42    void Cancel();
43
44   private:
45    void CheckOnFileThread();
46    void ReportResult(OwnershipService::Status status);
47
48    scoped_ptr<Callback> callback_;
49    scoped_refptr<base::MessageLoopProxy> origin_loop_;
50
51    DISALLOW_COPY_AND_ASSIGN(Core);
52  };
53
54  scoped_refptr<Core> core_;
55
56  DISALLOW_COPY_AND_ASSIGN(OwnershipStatusChecker);
57};
58
59}  // namespace chromeos
60
61#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_OWNERSHIP_STATUS_CHECKER_H_
62