Introduced the URLBlacklistManager, and wired it to various places.

chrome/browser/policy/url_blacklist_manager.h

+// Copyright (c) 2011 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_URL_BLACKLIST_MANAGER_H_
+#define CHROME_BROWSER_POLICY_URL_BLACKLIST_MANAGER_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/task.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
+#include "content/common/notification_observer.h"
+
+class GURL;
+class NotificationDetails;
+class NotificationSource;
+class PrefService;
+
+namespace base {
+class ListValue;
+}
+
+namespace policy {
+
+// TODO(joaodasilva): this is a work in progress. http://crbug.com/49612
+class URLBlacklist {
+ public:
+  URLBlacklist();
+  virtual ~URLBlacklist();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(URLBlacklist);
+};
+
+// Tracks the blacklist policies for a given profile, and updates it on changes.
+//
+// This class interacts with both the UI thread, where notifications of pref
+// changes are received from, and the IO thread, which owns it (in the
+// ProfileIOData) and checks for blacklisted URLs (from ChromeNetworkDelegate).
+//
+// It must be constructed on the UI thread, to set up |ui_method_factory_| and
+// the prefs listeners.
+//
+// ShutdownOnUIThread must be called from UI before destruction, to release
+// the prefs listeners on the UI thread. This is done from ProfileIOData.
+//
+// Update tasks from the UI thread can post safely to the IO thread, since the
+// destruction order of Profile and ProfileIOData guarantees that if this
+// exists in UI, then a potential destruction on IO will come after any task
+// posted to IO from that method on UI. This is used to go through IO before
+// the actual update starts, and grab a WeakPtr.
+class URLBlacklistManager : public NotificationObserver {
+ public:
+  // Must be constructed on the UI thread.
+  explicit URLBlacklistManager(PrefService* pref_service);
+  virtual ~URLBlacklistManager();
+
+  // Must be called on the UI thread, before destruction.
+  void ShutdownOnUIThread();
+
+  // Returns true if |url| is blocked by the current blacklist. Must be called
+  // from the IO thread.
+  bool IsURLBlocked(const GURL& url) const;
+
+  // Replaces the current blacklist. Must be called on the IO thread.
+  void SetBlacklist(URLBlacklist* blacklist);
+
+  // Registers the preferences related to blacklisting in the given PrefService.
+  static void RegisterPrefs(PrefService* pref_service);
+
+ protected:
+  typedef std::vector<std::string> StringVector;
+
+  // These are used to delay updating the blacklist while the preferences are
+  // changing, and execute only one update per simultaneous prefs changes.
+  void ScheduleUpdate();
+  virtual void PostUpdateTask(Task* task);  // Virtual for testing.
+  virtual void Update();  // Virtual for testing.
+
+  // Starts the blacklist update on the IO thread, using the filters in
+  // |block| and |allow|. Protected for testing.
+  void UpdateOnIO(StringVector* block, StringVector* allow);
+
+ private:
+  virtual void Observe(int type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) OVERRIDE;
+
+  // ---------
+  // UI thread
+  // ---------
+
+  // Used to post update tasks to the UI thread.
+  ScopedRunnableMethodFactory<URLBlacklistManager> ui_method_factory_;
+
+  // Used to track the policies and update the blacklist on changes.
+  PrefChangeRegistrar pref_change_registrar_;
+  PrefService* pref_service_;  // Weak.
+
+  // ---------
+  // IO thread
+  // ---------
+
+  // Used to get |weak_ptr_| to self on the IO thread.
+  base::WeakPtrFactory<URLBlacklistManager> io_weak_ptr_factory_;
+
+  // The current blacklist.
+  scoped_ptr<URLBlacklist> blacklist_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLBlacklistManager);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_URL_BLACKLIST_MANAGER_H_