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      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 "content/public/browser/notification_observer.h"
     15 #include "content/public/browser/notification_registrar.h"
     16 
     17 namespace content {
     18 class NotificationDetails;
     19 class NotificationSource;
     20 }
     21 
     22 
     23 // This class provides access to a list of email addresses for all profiles
     24 // connected to a Google account, from the IO thread.  The main purpose of
     25 // this is to be a member of the ProfileIOData structure to allow access to
     26 // the list of email addresses, and is used by the one-click sign in code to
     27 // know which Google accounts are already in use.
     28 //
     29 // Instance of this class are created and initialized on the UI
     30 // thread as part of the creation of ProfileIOData, and destroyed along with
     31 // ProfileIOData.
     32 class SigninNamesOnIOThread : public content::NotificationObserver {
     33  public:
     34   typedef std::set<base::string16> EmailSet;
     35 
     36   // Objects should only be created on UI thread.
     37   SigninNamesOnIOThread();
     38   virtual ~SigninNamesOnIOThread();
     39 
     40   // Gets the set of email addresses of connected profiles.  This method should
     41   // only be called on the IO thread.
     42   const EmailSet& GetEmails() const;
     43 
     44   // Releases all resource held by object. Once released, GetEmails() no
     45   // longer works.
     46   void ReleaseResourcesOnUIThread();
     47 
     48  private:
     49   // content::NotificationObserver
     50   virtual void Observe(int type,
     51                         const content::NotificationSource& source,
     52                         const content::NotificationDetails& details) OVERRIDE;
     53 
     54   // Checks whether the current thread is the IO thread.
     55   void CheckOnIOThread() const;
     56 
     57   // Checks whether the current thread is the UI thread.
     58   void CheckOnUIThread() const;
     59 
     60   // Posts a task to the I/O thread to add or remove the email address from
     61   // the set.
     62   void PostTaskToIOThread(int type, const base::string16& email);
     63 
     64   // Updates the email set on the I/O thread.  Protected for testing.
     65   void UpdateOnIOThread(int type, const base::string16& email);
     66 
     67   scoped_ptr<content::NotificationRegistrar> registrar_;
     68   EmailSet emails_;
     69 
     70   DISALLOW_COPY_AND_ASSIGN(SigninNamesOnIOThread);
     71 };
     72 
     73 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_NAMES_IO_THREAD_H_
     74