[fsp] Decouple file_service_provider::Service.

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 <vector>
 
 #include "base/files/file.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/file_system_provider/observer.h"
 #include "chrome/browser/chromeos/file_system_provider/request_manager.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"
 
+namespace extensions {
+class EventRouter;
+}  // namespace extensions
+
 namespace chromeos {
 namespace file_system_provider {
 
+class ProvidedFileSystemFactoryInterface;
+class ProvidedFileSystemInfo;
+class ProvidedFileSystemInterface;
 class ServiceFactory;
 
-// Manages and registers the fileSystemProvider service.
+// Manages and registers the file system provider service. Maintains provided
+// file systems.
 class Service : public KeyedService {
  public:
+  typedef base::Callback<ProvidedFileSystemInterface*(
+      extensions::EventRouter* event_router,
+      RequestManager* request_manager,
+      const ProvidedFileSystemInfo& file_system_info)>
+      FileSystemFactoryCallback;
+
   explicit Service(Profile* profile);
   virtual ~Service();
 
+  // Sets a custom ProvidedFileSystemInterface factory. Used by unit tests,
+  // where an event router is not available.
+  void SetFileSystemFactoryForTests(
+      const FileSystemFactoryCallback& factory_callback);
+
   // Mounts a file system provided by an extension with the |extension_id|.
   // For success, it returns a numeric file system id, which is an
   // auto-incremented non-zero value. For failures, it returns zero.
   int MountFileSystem(const std::string& extension_id,
                       const std::string& file_system_name);
 
   // Unmounts a file system with the specified |file_system_id| for the
   // |extension_id|. For success returns true, otherwise false.
   bool UnmountFileSystem(const std::string& extension_id, int file_system_id);
 
-  // Returns a list of currently mounted file systems. All items are copied.
-  std::vector<ProvidedFileSystem> GetMountedFileSystems();
+  // Requests unmounting of the file system. The callback is called when the
+  // request is accepted or rejected, with an error code. Returns false if the
+  // request could not been created, true otherwise.
+  bool RequestUnmount(int file_system_id);
 
-  // Handles successful response for the |request_id|. If |has_next| is false,
-  // then the request is disposed, after handling the |response|. On error,
-  // returns false, and the request is disposed.
-  bool FulfillRequest(const std::string& extension_id,
-                      int file_system_id,
-                      int request_id,
-                      scoped_ptr<base::DictionaryValue> result,
-                      bool has_next);
+  // Returns a list of information of all currently provided file systems. All
+  // items are copied.
+  std::vector<ProvidedFileSystemInfo> GetProvidedFileSystemInfoList();
 
-  // Handles error response for the |request_id|. If handling the error fails,
-  // returns false. Always disposes the request.
-  bool RejectRequest(const std::string& extension_id,
-                     int file_system_id,
-                     int request_id,
-                     base::File::Error error);
-
-  // Requests unmounting of a file system with the passed |file_system_id|.
-  // Returns true is unmounting has been requested. False, if the request is
-  // invalid (eg. already unmounted).
-  bool RequestUnmount(int file_system_id);
+  // Returns a provided file system with |file_system_id|, handled by
+  // the extension with |extension_id|. If not found, then returns NULL.
+  ProvidedFileSystemInterface* GetProvidedFileSystem(
+      const std::string& extension_id,
+      int file_system_id);
 
   // Adds and removes observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Gets the singleton instance for the |context|.
   static Service* Get(content::BrowserContext* context);
 
   // BrowserContextKeyedService overrides.
   virtual void Shutdown() OVERRIDE;
 
+  // Getter for the request manager. Used by the extension API to forward
+  // replies. Valid as long as the service.
+  RequestManager* request_manager() { return &request_manager_; }
+
  private:
-  typedef std::map<int, ProvidedFileSystem> FileSystemMap;
+  typedef std::map<int, ProvidedFileSystemInterface*> ProvidedFileSystemMap;
 
-  // Called when the providing extension calls the success callback for the
-  // onUnmountRequested event.
-  void OnRequestUnmountError(const ProvidedFileSystem& file_system,
-                             base::File::Error error);
+  // 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);
 
   RequestManager request_manager_;
   Profile* profile_;
+  FileSystemFactoryCallback file_system_factory_;
   ObserverList<Observer> observers_;
-  FileSystemMap file_systems_;
+  ProvidedFileSystemMap file_system_map_;  // Owns pointers.
   int next_id_;
   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_