Refresh policies from DM server periodically

chrome/browser/policy/device_management_policy_provider.h

Index: chrome/browser/policy/device_management_policy_provider.h
diff --git a/chrome/browser/policy/device_management_policy_provider.h b/chrome/browser/policy/device_management_policy_provider.h
index d91e22bbd8fcf98d130dfc01dbd88b15db42fa7e..89ef850caa4c77a518db2cc600dcf049a8387440 100644
--- a/chrome/browser/policy/device_management_policy_provider.h
+++ b/chrome/browser/policy/device_management_policy_provider.h
@@ -10,13 +10,11 @@
 
 #include "base/file_path.h"
 #include "base/scoped_ptr.h"
+#include "base/time.h"
 #include "base/weak_ptr.h"
 #include "chrome/browser/policy/configuration_policy_provider.h"
 #include "chrome/browser/policy/device_management_backend.h"
-#include "chrome/common/notification_details.h"
-#include "chrome/common/notification_observer.h"
-#include "chrome/common/notification_registrar.h"
-#include "chrome/common/notification_source.h"
+#include "chrome/browser/policy/device_token_fetcher.h"
 
 class TokenService;
 
@@ -24,16 +22,15 @@ namespace policy {
 
 class DeviceManagementBackend;
 class DeviceManagementPolicyCache;
-class DeviceTokenFetcher;
 
 // Provides policy fetched from the device management server. With the exception
 // of the Provide method, which can be called on the FILE thread, all public
 // methods must be called on the UI thread.
 class DeviceManagementPolicyProvider
     :  public ConfigurationPolicyProvider,
-       public NotificationObserver,
        public DeviceManagementBackend::DevicePolicyResponseDelegate,
-       public base::SupportsWeakPtr<DeviceManagementPolicyProvider> {
+       public base::SupportsWeakPtr<DeviceManagementPolicyProvider>,
+       public DeviceTokenFetcher::Observer {
  public:
   DeviceManagementPolicyProvider(const PolicyDefinitionList* policy_list,
                                  DeviceManagementBackend* backend,
@@ -45,16 +42,16 @@ class DeviceManagementPolicyProvider
   // ConfigurationPolicyProvider implementation:
   virtual bool Provide(ConfigurationPolicyStoreInterface* store);
 
-  // NotificationObserver implementation:
-  virtual void Observe(NotificationType type,
-                       const NotificationSource& source,
-                       const NotificationDetails& details);
-
   // DevicePolicyResponseDelegate implementation:
   virtual void HandlePolicyResponse(
       const em::DevicePolicyResponse& response);
   virtual void OnError(DeviceManagementBackend::ErrorCode code);
 
+  // DeviceTokenFetcher::Observer implementation:
+  void OnTokenSuccess();
+  void OnTokenError();
+  void OnNotManaged();
+
   // True if a policy request has been sent to the device management backend
   // server and no response or error has yet been received.
   bool IsPolicyRequestPending() const { return policy_request_pending_; }
@@ -65,6 +62,9 @@ class DeviceManagementPolicyProvider
 
  private:
   class InitializeAfterIOThreadExistsTask;
+  class RefreshTask;
+
+  friend class DeviceManagementPolicyProviderTest;
 
   // Called by constructors to perform shared initialization. Initialization
   // requiring the IOThread must not be performed directly in this method,
@@ -80,9 +80,15 @@ class DeviceManagementPolicyProvider
   // already outstanding.
   void SendPolicyRequest();
 
-  // True if policy must be re-fetched because the cached policy is too old or
-  // its time stamp is invalid.
-  bool IsPolicyStale() const;
+  // Triggers policy refresh, re-requesting device token and policy information
+  // as necessary.
+  void RefreshTaskExecute();
+
+  // Schedules a new RefreshTask.
+  void ScheduleRefreshTask(int64 delay_in_milliseconds);
+
+  // Calculates when the next RefreshTask shall be executed.
+  int64 GetRefreshTaskDelay();
 
   // Provides the URL at which requests are sent to from the device management
   // backend.
@@ -93,13 +99,32 @@ class DeviceManagementPolicyProvider
   static FilePath GetOrCreateDeviceManagementDir(
       const FilePath& user_data_dir);
 
+  // Give unit tests the ability to override timeout settings.
+  void set_policy_refresh_rate_ms(int64 policy_refresh_rate_ms) {
+    policy_refresh_rate_ms_ = policy_refresh_rate_ms;
+  }
+  void set_policy_refresh_max_earlier_ms(int64 policy_refresh_max_earlier_ms) {
+    policy_refresh_max_earlier_ms_ = policy_refresh_max_earlier_ms;
+  }
+  void set_policy_refresh_error_delay_ms(int64 policy_refresh_error_delay_ms) {
+    policy_refresh_error_delay_ms_ = policy_refresh_error_delay_ms;
+  }
+  void set_token_fetch_error_delay_ms(int64 token_fetch_error_delay_ms) {
+    token_fetch_error_delay_ms_ = token_fetch_error_delay_ms;
+  }
+
   scoped_ptr<DeviceManagementBackend> backend_;
-  TokenService* token_service_; // weak
+  TokenService* token_service_;  // weak
   scoped_ptr<DeviceManagementPolicyCache> cache_;
   scoped_refptr<DeviceTokenFetcher> token_fetcher_;
-  NotificationRegistrar registrar_;
+  DeviceTokenFetcher::ObserverRegistrar registrar_;
   FilePath storage_dir_;
   bool policy_request_pending_;
+  bool refresh_task_pending_;
+  int64 policy_refresh_rate_ms_;
+  int64 policy_refresh_max_earlier_ms_;
+  int64 policy_refresh_error_delay_ms_;
+  int64 token_fetch_error_delay_ms_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceManagementPolicyProvider);
 };