Refactor the windows policy provider to use AsynchronousPolicyProvider.

chrome/browser/policy/file_based_policy_loader.h

 // Copyright (c) 2010 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_POLICY_FILE_BASED_POLICY_LOADER_H_
 #define CHROME_BROWSER_POLICY_FILE_BASED_POLICY_LOADER_H_
 #pragma once
 
 #include "chrome/browser/file_path_watcher/file_path_watcher.h"
 #include "chrome/browser/policy/asynchronous_policy_loader.h"
 #include "chrome/browser/policy/file_based_policy_provider.h"
 
 namespace policy {
 
 // A customized asynchronous policy loader that handles loading policy from a
 // file using a FilePathWatcher. The loader creates a fallback task to load
 // policy periodically in case the watcher fails and retries policy loads when
 // the watched file is in flux.
 class FileBasedPolicyLoader : public AsynchronousPolicyLoader {
  public:
   FileBasedPolicyLoader(
       FileBasedPolicyProvider::ProviderDelegate* provider_delegate);
 
-  // AsynchronousPolicyLoader implementation:
-  virtual void Init();
-  virtual void Stop();
+  // AsynchronousPolicyLoader overrides:
   virtual void Reload();
 
   void OnFilePathChanged(const FilePath& path);
   void OnError();
 
  protected:
   // FileBasedPolicyLoader objects should only be deleted by
   // RefCountedThreadSafe.
   friend class base::RefCountedThreadSafe<AsynchronousPolicyLoader>;
   virtual ~FileBasedPolicyLoader();
 
   const FilePath& config_file_path() { return config_file_path_; }
 
+  // AsynchronousPolicyLoader overrides:
+
+  // Creates the file path watcher and configures it to watch
+  // |config_file_path_|.  Must be called on the file thread.
+  virtual void InitOnFileThread();
+  virtual void StopOnFileThread();
+
  private:
-  // Finishes initialization after the threading system has been fully
-  // intiialized.
-  void InitAfterFileThreadAvailable();
-
-  // Creates the file path watcher, configures it to watch |config_file_path_|
-  // and schedules the fallback reload task. Must be called on the file thread.
-  void InitOnFileThread();
-
-  // Cancels file path watch notification and destroys the watcher.
-  // Must be called on file thread.
-  void StopOnFileThread();
-
-  // Schedules a reload task to run when |delay| expires. Must be called on the
-  // file thread.
-  void ScheduleReloadTask(const base::TimeDelta& delay);
-
-  // Schedules a reload task to run after the number of minutes specified
-  // in |reload_interval_minutes_|. Must be called on the file thread.
-  void ScheduleFallbackReloadTask();
-
-  // Invoked from the reload task on the file thread.
-  void ReloadFromTask();
-
   // Checks whether policy information is safe to read. If not, returns false
   // and then delays until it is considered safe to reload in |delay|.
   // Must be called on the file thread.
   bool IsSafeToReloadPolicy(const base::Time& now, base::TimeDelta* delay);
 
   // The path at which we look for configuration files.
   const FilePath config_file_path_;
 
   // Managed with a scoped_ptr rather than being declared as an inline member to
   // decouple the watcher's life cycle from the loader's. This decoupling makes
   // it possible to destroy the watcher before the loader's destructor is called
   // (e.g. during Stop), since |watcher_| internally holds a reference to the
   // loader and keeps it alive.
   scoped_ptr<FilePathWatcher> watcher_;
 
-  // The reload task. Access only on the file thread. Holds a reference to the
-  // currently posted task, so we can cancel and repost it if necessary.
-  CancelableTask* reload_task_;
-
-  // The interval that a policy reload will be triggered as a fallback even if
-  // the delegate doesn't indicate that one is needed.
-  const base::TimeDelta  reload_interval_;
-
   // Settle interval.
   const base::TimeDelta settle_interval_;
 
   // Records last known modification timestamp of |config_file_path_|.
   base::Time last_modification_file_;
 
   // The wall clock time at which the last modification timestamp was
   // recorded.  It's better to not assume the file notification time and the
   // wall clock times come from the same source, just in case there is some
   // non-local filesystem involved.
   base::Time last_modification_clock_;
 
   DISALLOW_COPY_AND_ASSIGN(FileBasedPolicyLoader);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_FILE_BASED_POLICY_LOADER_H_