tora_neighbor.cc

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00001 /* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
00002 /*
00003  * Copyright (c) 1997 Regents of the University of California.
00004  * All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  * 3. All advertising materials mentioning features or use of this software
00015  *    must display the following acknowledgement:
00016  *      This product includes software developed by the Computer Systems
00017  *      Engineering Group at Lawrence Berkeley Laboratory.
00018  * 4. Neither the name of the University nor of the Laboratory may be used
00019  *    to endorse or promote products derived from this software without
00020  *    specific prior written permission.
00021  *
00022  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00023  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00025  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00026  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00027  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00028  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00029  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00030  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00031  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00032  * SUCH DAMAGE.
00033  */
00034 /* Ported from CMU/Monarch's code*/
00035 
00036 /*
00037   $Id: tora_neighbor.cc,v 1.2 1999/08/12 21:12:34 yaxu Exp $
00038   */
00039 
00040 #include <agent.h>
00041 #include <random.h>
00042 #include <trace.h>
00043 
00044 #include <ll.h>
00045 #include <priqueue.h>
00046 #include <tora/tora_packet.h>
00047 #include <tora/tora.h>
00048 
00049 #define CURRENT_TIME    Scheduler::instance().clock()
00050 
00051 /* ======================================================================
00052    TORANeighbor Class Functions
00053    ====================================================================== */
00054 TORANeighbor::TORANeighbor(nsaddr_t id, Agent *a) : height(id)
00055 {
00056     index = id;  
00057     lnk_stat = LINK_UN;
00058     time_act = Scheduler::instance().clock();
00059 
00060         agent = (toraAgent*) a;
00061 }       
00062 
00063 
00064 void
00065 TORANeighbor::update_link_status(Height *h)
00066 {
00067 #ifdef LOGGING
00068         int t = lnk_stat;
00069 #endif
00070     if(height.isNull())
00071         lnk_stat = LINK_UN;
00072     else if(h->isNull())
00073         lnk_stat = LINK_DN;
00074     else if(height.compare(h) > 0)
00075         lnk_stat = LINK_DN;
00076     else if(height.compare(h) < 0)
00077         lnk_stat = LINK_UP;
00078 #ifdef LOGGING
00079         if(t != lnk_stat) {
00080                 agent->log_nb_state_change(this);
00081         }
00082 #endif
00083 }
00084 
00085 void
00086 TORANeighbor::dump()
00087 {
00088     fprintf(stdout, "\t\tNEIG: %d, Link Status: %d, Time Active: %f\n",
00089         index, lnk_stat, time_act);
00090     fprintf(stdout, "\t\t\ttau: %f, oid: %d, r: %d, delta: %d, id: %d\n",
00091         height.tau, height.oid, height.r, height.delta, height.id);
00092 }
00093 

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