Creating a skeleton for Google Now for Chrome implementation.

chrome/browser/ui/google_now/google_now_service.h

+// 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_UI_GOOGLE_NOW_GOOGLE_NOW_SERVICE_H_
+#define CHROME_BROWSER_UI_GOOGLE_NOW_GOOGLE_NOW_SERVICE_H_
+
+#include "base/timer.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+
+class Profile;
+
+namespace base {
+class TimeDelta;
+}
+
+namespace content {
+struct Geoposition;
+}
+
+namespace net {
+class URLRequest;
+}
+
+// The Google Now service gets Google Now cards from the server and shows them
+// as Chrome notifications.
+// The service performs periodic updating of Google Now cards.
+// Each updating of the cards consists of 3 steps:
+// 1. Obtaining the location of the machine (asynchronous);
+// 2. Making a server request (asynchronous);
+// 3. Showing the cards as notifications.
+class GoogleNowService : public ProfileKeyedService {
+ public:
+  // Must call Init after construction.
+  explicit GoogleNowService(Profile* profile);
+  virtual ~GoogleNowService();
+  void Init();
+
+ private:
+  // Parsed response from the server.
+  struct ServerResponse;
+
+  // Returns true if Google Now integration is enabled for the profile.
+  bool IsGoogleNowEnabled() const;
+  // Gets new cards from the server and shows them as notifications.
+  void UpdateCards();
+
+  // Schedules next cards update after the specified delay.
+  void StartWaitingForNextUpdate(base::TimeDelta delay);
+  void OnWaitingForNextUpdateEnds();
+
+  // Starts obtaining location of the machine.
+  void StartObtainingGeolocation();
+  void OnLocationObtained(const content::Geoposition& position);
+
+  // Starts downloading cards from the server.
+  void StartServerRequest(const content::Geoposition& position);
+  void OnServerRequestCompleted(net::URLRequest* request, int num_bytes);
+
+  // Parses server response. Returns true if the parsing was successful.
+  static bool ParseServerResponse(const net::URLRequest* request,
+                                  int num_bytes,
+                                  ServerResponse* server_response);
+
+  // Shows Google Now cards as notifications.
+  void ShowNotifications(const ServerResponse& server_response);
+
+  // The profile.
+  Profile* const profile_;
+  // Timer to schedule next cards update.
+  base::OneShotTimer<GoogleNowService> next_update_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(GoogleNowService);
+};
+
+#endif  // CHROME_BROWSER_UI_GOOGLE_NOW_GOOGLE_NOW_SERVICE_H_