text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FACTORY_H_
  #define CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FACTORY_H_
  
  #include "base/memory/singleton.h"
  #include "base/observer_list.h"
  #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
  
  class SigninManager;
  class SigninManagerBase;
  class PrefRegistrySimple;
  class Profile;
  
  // Singleton that owns all SigninManagers and associates them with
  // Profiles. Listens for the Profile's destruction notification and cleans up
  // the associated SigninManager.
  class SigninManagerFactory : public BrowserContextKeyedServiceFactory {
   public:
    class Observer {
     public:
      // Called when a SigninManager(Base) instance is created.
      virtual void SigninManagerCreated(SigninManagerBase* manager) {}
  
      // Called when a SigninManager(Base) instance is being shut down. Observers
      // of |manager| should remove themselves at this point.
      virtual void SigninManagerShutdown(SigninManagerBase* manager) {}
  
     protected:
      virtual ~Observer() {}
    };
  
  #if defined(OS_CHROMEOS)
    // Returns the instance of SigninManager associated with this profile
    // (creating one if none exists). Returns NULL if this profile cannot have a
    // SigninManager (for example, if |profile| is incognito).
    static SigninManagerBase* GetForProfile(Profile* profile);
  
    // Returns the instance of SigninManager associated with this profile. Returns
    // null if no SigninManager instance currently exists (will not create a new
    // instance).
    static SigninManagerBase* GetForProfileIfExists(Profile* profile);
  #else
    // On non-ChromeOS platforms, the SigninManager the factory creates will be
    // an instance of the extended SigninManager class.
    static SigninManager* GetForProfile(Profile* profile);
    static SigninManager* GetForProfileIfExists(Profile* profile);
  #endif
  
    // Returns an instance of the SigninManagerFactory singleton.
    static SigninManagerFactory* GetInstance();
  
    // Implementation of BrowserContextKeyedServiceFactory (public so tests
    // can call it).
    virtual void RegisterProfilePrefs(
        user_prefs::PrefRegistrySyncable* registry) OVERRIDE;
  
    // Registers the browser-global prefs used by SigninManager.
    static void RegisterPrefs(PrefRegistrySimple* registry);
  
    // Methods to register or remove observers of SigninManager creation/shutdown.
    void AddObserver(Observer* observer);
    void RemoveObserver(Observer* observer);
  
    // Notifies observers of |manager|'s creation. Should be called only by test
    // SigninManager subclasses whose construction does not occur in
    // |BuildServiceInstanceFor()|.
    void NotifyObserversOfSigninManagerCreationForTesting(
        SigninManagerBase* manager);
  
   private:
    friend struct DefaultSingletonTraits<SigninManagerFactory>;
  
    SigninManagerFactory();
    virtual ~SigninManagerFactory();
  
    // List of observers. Checks that list is empty on destruction.
    mutable ObserverList<Observer, true> observer_list_;
  
    // BrowserContextKeyedServiceFactory:
    virtual KeyedService* BuildServiceInstanceFor(
        content::BrowserContext* profile) const OVERRIDE;
    virtual void BrowserContextShutdown(content::BrowserContext* context)
        OVERRIDE;
  };
  
  #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FACTORY_H_
  