beagled/GConfThreadHelper.cs

   1 //
   2 // GConfThreadHelper.cs
   3 //
   4 // Copyright (C) 2004 Novell, Inc.
   5 //
   6 //
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.Threading;
  29 using GConf;
  30 using GLib;
  31
  32 namespace Beagle.Daemon {
  33
  34         public class GConfThreadHelper {
  35                 private static object lock_obj = new object ();
  36                 private static GConf.Client gconf_client = null;
  37
  38                 private string path;
  39                 private object data;
  40                 private bool finished;
  41                 private Exception ex;
  42
  43                 private GConfThreadHelper (string path)
  44                 {
  45                         this.path = path;
  46                         this.finished = false;
  47                 }
  48
  49                 private bool GConfReady ()
  50                 {
  51                         lock (lock_obj) {
  52                                 if (gconf_client == null)
  53                                         gconf_client = new GConf.Client ();
  54
  55                                 try {
  56                                         this.data = gconf_client.Get (this.path);
  57                                 } catch (Exception ex) {
  58                                         this.ex = ex;
  59                                 }
  60
  61                                 this.finished = true;
  62                                 Monitor.Pulse (lock_obj);
  63                         }
  64
  65                         return false;
  66                 }
  67
  68                 static private TimeSpan one_second = new TimeSpan (10000000);
  69
  70                 public static object Get (string path)
  71                 {
  72                         lock (lock_obj) {
  73                                 GConfThreadHelper helper = new GConfThreadHelper (path);
  74
  75                                 GLib.Idle.Add (new GLib.IdleHandler (helper.GConfReady));
  76
  77                                 while (! helper.finished
  78                                        && ! Shutdown.ShutdownRequested)
  79                                         Monitor.Wait (lock_obj, one_second);
  80
  81                                 if (helper.ex != null)
  82                                         throw helper.ex;
  83
  84                                 return helper.data;
  85                         }
  86                 }
  87         }
  88 }