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watchble.h

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00001 #ifndef __WATCHBLE_H_INCLUDED__
00002 #define __WATCHBLE_H_INCLUDED__
00003 
00004 // $Id$
00005 
00006 //**********************************************************************
00007 //                                                                     *
00008 //    Description:   Watchable object base class.                      *
00009 //                                                                     *
00010 //    Author:        Chris White (whitecf@bcs.org.uk)                  *
00011 //                                                                     *
00012 //    Copyright (C) 2003  Monitor Computing Services Ltd.              *
00013 //                                                                     *
00014 //    This program is free software; you can redistribute it and/or    *
00015 //    modify it under the terms of the GNU General Public License      *
00016 //    as published by the Free Software Foundation; either version 2   *
00017 //    of the License, or any later version.                            *
00018 //                                                                     *
00019 //    This program is distributed in the hope that it will be useful,  *
00020 //    but WITHOUT ANY WARRANTY; without even the implied warranty of   *
00021 //    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the    *
00022 //    GNU General Public License for more details.                     *
00023 //                                                                     *
00024 //    You should have received a copy of the GNU General Public        *
00025 //    License (http://www.gnu.org/copyleft/gpl.html) along with this   *
00026 //    program; if not, write to:                                       *
00027 //       The Free Software Foundation Inc.,                            *
00028 //       59 Temple Place - Suite 330,                                  *
00029 //       Boston, MA  02111-1307,                                       *
00030 //       USA.                                                          *
00031 //                                                                     *
00032 //**********************************************************************
00033 //                                                                     *
00034 //    Notes:                                                           *
00035 //                                                                     *
00036 //**********************************************************************
00037 
00038 
00039 namespace Monitor {
00040 namespace Utility {
00041 
00042 // Forward declerations within namespace
00043 class CallbackBase;
00044 class CallbackList;
00045 
00046 
00047 
00051 class Watchable
00052 {
00053 public:
00057     Watchable();
00058 
00062     virtual ~Watchable();
00063 
00064 
00072     const CallbackBase&
00073     addWatch(const CallbackBase&    newWatch) const;
00074 
00080     void
00081     removeWatch(const CallbackBase&    oldWatch) const;
00082 
00088     void
00089     removeWatcher(const void*    watcher) const;
00090 
00096     virtual void
00097     updated(const void*    updateData = 0) const;
00098 
00102     void
00103     freeze() const;
00104 
00108     void
00109     thaw() const;
00110 
00111 
00112 private:
00116     mutable CallbackList*    watchList;
00117 
00121     mutable int    frozen;
00122 };
00123 
00124 };  // namespace Utility
00125 };  // namespace Monitor
00126 
00127 #endif // __WATCHBLE_H_INCLUDED__
00128 

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