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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 "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   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& username,
     46                                      const std::string& password) OVERRIDE;
     47   virtual void GoogleSignedOut(const std::string& username) OVERRIDE;
     48 
     49   // SigninManagerFactory::Observer:
     50   virtual void SigninManagerCreated(SigninManagerBase* manager) OVERRIDE;
     51   virtual void SigninManagerShutdown(SigninManagerBase* manager) OVERRIDE;
     52 
     53   // Checks whether the current thread is the IO thread.
     54   void CheckOnIOThread() const;
     55 
     56   // Checks whether the current thread is the UI thread.
     57   void CheckOnUIThread() const;
     58 
     59   // Posts a task to the I/O thread to add or remove the email address from
     60   // the set.
     61   void PostTaskToIOThread(bool add, const base::string16& email);
     62 
     63   // Updates the email set on the I/O thread.  Protected for testing.
     64   void UpdateOnIOThread(bool add, const base::string16& email);
     65 
     66   EmailSet emails_;
     67 
     68   // The set of SigninManagerBase instances that this instance is currently
     69   // observing. Can only be accessed on the UI thread.
     70   std::set<SigninManagerBase*> observed_managers_;
     71   bool resources_released_;
     72 
     73   DISALLOW_COPY_AND_ASSIGN(SigninNamesOnIOThread);
     74 };
     75 
     76 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_NAMES_IO_THREAD_H_
     77