1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4  * License, v. 2.0. If a copy of the MPL was not distributed with this
5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 
7 #ifndef LogModulePrefWatcher_h
8 #define LogModulePrefWatcher_h
9 
10 #include "nsIObserver.h"
11 
12 namespace mozilla {
13 
14 /**
15  * Watches for changes to "logging.*" prefs and then updates the appropriate
16  * LogModule's log level. Both the integer and string versions of the LogLevel
17  * enum are supported.
18  *
19  * For example setting the pref "logging.Foo" to "Verbose" will set the
20  * LogModule for "Foo" to the LogLevel::Verbose level. Setting "logging.Bar" to
21  * 4 would set the LogModule for "Bar" to the LogLevel::Debug level.
22  */
23 class LogModulePrefWatcher : public nsIObserver {
24  public:
25   NS_DECL_ISUPPORTS
26   NS_DECL_NSIOBSERVER
27 
28   /**
29    * Starts observing logging pref changes.
30    */
31   static void RegisterPrefWatcher();
32 
33  private:
34   LogModulePrefWatcher();
35   virtual ~LogModulePrefWatcher() = default;
36 };
37 }  // namespace mozilla
38 
39 #endif  // LogModulePrefWatcher_h
40