// // Copyright (C) 2005 Andras Varga // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. // // // Using NotificationBoard, modules can now notify each other about // "events" such as routing table changes, interface status changes (up/down), // interface configuration changes, wireless handovers, changes in the state // of the wireless channel, mobile node position changes, etc. // // The NotificationBoard has exactly one instance within a host or router // model, and acts as a intermediary between module where state changes // can occur and modules which are interested in learning about those // changes. // // NotificationBoard is accessed via direct C++ method calls (not // message exchange). Modules can "subscribe" to categories of changes // (e.g. "routing table changed" or "radio channel became empty"). // When such a change occurs, the corresponding module (e.g. the RoutingTable // or the physical layer module) will let NotificationBoard know, and // it will disseminate this information to all interested modules. // simple NotificationBoard endsimple