chrome/browser/signin/signin_names_io_thread.h

   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.
  26 class 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   ~SigninNamesOnIOThread() override;
  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   void GoogleSigninSucceeded(const std::string& account_id,
  46                              const std::string& username,
  47                              const std::string& password) override;
  48   void GoogleSignedOut(const std::string& account_id,
  49                        const std::string& username) override;
  50
  51   // SigninManagerFactory::Observer:
  52   void SigninManagerCreated(SigninManagerBase* manager) override;
  53   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_