[fsp] Store mounted file systems in preferences.

chrome/browser/chromeos/file_system_provider/service.h

 // Copyright 2014 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_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
+#include "base/threading/thread_checker.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/file_system_provider/observer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/file_system_provider.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/browser_context.h"
 #include "extensions/browser/extension_registry_observer.h"
 #include "extensions/common/extension.h"
 
 namespace extensions {
 class EventRouter;
 class ExtensionRegistry;
 }  // namespace extensions
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}  // namespace user_prefs
+
 namespace chromeos {
 namespace file_system_provider {
 
+// Key names for preferences.
+extern const char kPrefKeyFileSystemId[];
+extern const char kPrefKeyFileSystemName[];
+
 class ProvidedFileSystemFactoryInterface;
 class ProvidedFileSystemInfo;
 class ProvidedFileSystemInterface;
 class ServiceFactory;
 
+// Registers preferences to remember registered file systems between reboots.
+void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
 // Manages and registers the file system provider service. Maintains provided
 // file systems.
 class Service : public KeyedService,
                 public extensions::ExtensionRegistryObserver {
  public:
   typedef base::Callback<ProvidedFileSystemInterface*(
       extensions::EventRouter* event_router,
       const ProvidedFileSystemInfo& file_system_info)>
       FileSystemFactoryCallback;
 
@@ skipping 42 matching lines @@
   void RemoveObserver(Observer* observer);
 
   // Gets the singleton instance for the |context|.
   static Service* Get(content::BrowserContext* context);
 
   // extensions::ExtensionRegistryObserver overrides.
   virtual void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const extensions::Extension* extension,
       extensions::UnloadedExtensionInfo::Reason reason) OVERRIDE;
+  virtual void OnExtensionLoaded(
+      content::BrowserContext* browser_context,
+      const extensions::Extension* extension) OVERRIDE;
 
  private:
   // Key is a pair of an extension id and file system id, which makes it
   // unique among the entire service instance.
   typedef std::pair<std::string, std::string> FileSystemKey;
 
   typedef std::map<FileSystemKey, ProvidedFileSystemInterface*>
       ProvidedFileSystemMap;
   typedef std::map<std::string, FileSystemKey> MountPointNameToKeyMap;
 
   // Called when the providing extension accepts or refuses a unmount request.
   // If |error| is equal to FILE_OK, then the request is accepted.
   void OnRequestUnmountStatus(const ProvidedFileSystemInfo& file_system_info,
                               base::File::Error error);
 
+  // Saves a list of currently mounted file systems to preferences. Called
+  // from a destructor (on shutdown).
+  void RememberFileSystems();
+
+  // Removes all of the file systems mounted by the |extension_id| from
+  // preferences, so they are not loaded again after reboot.
+  void ForgetFileSystems(const std::string& extension_id);
+
+  // Restores from preferences file systems mounted previously by the
+  // |extension_id| providing extension.
+  void RestoreFileSystems(const std::string& extension_id);
+
   Profile* profile_;
   extensions::ExtensionRegistry* extension_registry_;  // Not owned.
   FileSystemFactoryCallback file_system_factory_;
   ObserverList<Observer> observers_;
   ProvidedFileSystemMap file_system_map_;  // Owns pointers.
   MountPointNameToKeyMap mount_point_name_to_key_map_;
+  base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<Service> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Service);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_