1// Copyright (c) 2012 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_SIGNIN_SIGNIN_NAMES_IO_THREAD_H_
6#define CHROME_BROWSER_SIGNIN_SIGNIN_NAMES_IO_THREAD_H_
7
8#include <set>
9
10#include "base/basictypes.h"
11#include "base/memory/ref_counted.h"
12#include "base/memory/scoped_ptr.h"
13#include "base/strings/string16.h"
14#include "chrome/browser/signin/signin_manager_factory.h"
15#include "components/signin/core/browser/signin_manager_base.h"
16
17// This class provides access to a list of email addresses for all profiles
18// connected to a Google account, from the IO thread.  The main purpose of
19// this is to be a member of the ProfileIOData structure to allow access to
20// the list of email addresses, and is used by the one-click sign in code to
21// know which Google accounts are already in use.
22//
23// Instance of this class are created and initialized on the UI
24// thread as part of the creation of ProfileIOData, and destroyed along with
25// ProfileIOData.
26class SigninNamesOnIOThread : public SigninManagerBase::Observer,
27                              public SigninManagerFactory::Observer {
28 public:
29  typedef std::set<base::string16> EmailSet;
30
31  // Objects should only be created on UI thread.
32  SigninNamesOnIOThread();
33  virtual ~SigninNamesOnIOThread();
34
35  // Gets the set of email addresses of connected profiles.  This method should
36  // only be called on the IO thread.
37  const EmailSet& GetEmails() const;
38
39  // Releases all resource held by object. Once released, GetEmails() no
40  // longer works.
41  void ReleaseResourcesOnUIThread();
42
43 private:
44  // SigninManagerBase::Observer:
45  virtual void GoogleSigninSucceeded(const std::string& account_id,
46                                     const std::string& username,
47                                     const std::string& password) OVERRIDE;
48  virtual void GoogleSignedOut(const std::string& account_id,
49                               const std::string& username) OVERRIDE;
50
51  // SigninManagerFactory::Observer:
52  virtual void SigninManagerCreated(SigninManagerBase* manager) OVERRIDE;
53  virtual void SigninManagerShutdown(SigninManagerBase* manager) OVERRIDE;
54
55  // Checks whether the current thread is the IO thread.
56  void CheckOnIOThread() const;
57
58  // Checks whether the current thread is the UI thread.
59  void CheckOnUIThread() const;
60
61  // Posts a task to the I/O thread to add or remove the email address from
62  // the set.
63  void PostTaskToIOThread(bool add, const base::string16& email);
64
65  // Updates the email set on the I/O thread.  Protected for testing.
66  void UpdateOnIOThread(bool add, const base::string16& email);
67
68  EmailSet emails_;
69
70  // The set of SigninManagerBase instances that this instance is currently
71  // observing. Can only be accessed on the UI thread.
72  std::set<SigninManagerBase*> observed_managers_;
73  bool resources_released_;
74
75  DISALLOW_COPY_AND_ASSIGN(SigninNamesOnIOThread);
76};
77
78#endif  // CHROME_BROWSER_SIGNIN_SIGNIN_NAMES_IO_THREAD_H_
79