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Agents</A><B> Previous:</B> <A NAME="tex2html2855" HREF="node100.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node100.html">10.1 Agent state</A>   <B> <A NAME="tex2html2863" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html2865" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H1><A NAME="SECTION03720000000000000000"></A><A NAME="sec:agentmethods"></A><BR>10.2 Agent methods</H1><P>The Agent../ns-2/agent.h supports packet generation and reception.The following member functions are implemented by the C++ Agent class, and aregenerally <EM>not</EM> over-ridden by derived classes:<P><TABLE CELLPADDING=3 WIDTH="100%"><TR><TD ALIGN="RIGHT">[]Packet* allocpkt</TD><TD ALIGN="LEFT">allocate new packet and assign its fields</TD></TR><TR><TD ALIGN="RIGHT">[int]Packet* allocpkt</TD><TD ALIGN="LEFT">allocate new packet with a data payload of n bytes and assign its fields</TD></TR></TABLE><P>The following member functions are also defined by the class Agent,but <EM>are</EM> intended to be over-ridden by classes deriving from Agent:<P><TABLE CELLPADDING=3 WIDTH="100%"><TR><TD ALIGN="RIGHT">[timeout number]void timeout</TD><TD ALIGN="LEFT">subclass-specific time out method</TD></TR><TR><TD ALIGN="RIGHT">[Packet*, Handler*]void recv</TD><TD ALIGN="LEFT">receiving agent main receive path</TD></TR></TABLE><P>The []allocpkt method is used by derived classesto create packets to send.The function fills in the following fieldsin the common packet headerSectionchap:pformat:<TT>uid, ptype, size</TT>, and the following fields in the IP header:<TT>src, dst, flowid, prio, ttl</TT>.It also zero-fills in the following fields of the Flags header:<TT>ecn, pri, usr1, usr2</TT>.Any packet header information not included in these lists mustbe must be handled in the classes derived from <TT>Agent</TT>.<P>The []recv method is the main entry point for anAgent which receives packets, andis invoked by upstream nodes when sending a packet.In most cases, Agents make no use of the second argument (the handlerdefined by upstream nodes).<P><HR><!--Navigation Panel--><A NAME="tex2html2866" HREF="node102.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node102.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html2860" HREF="node99.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node99.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html2854" HREF="node100.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node100.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html2862" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html2864" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html2867" HREF="node102.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node102.html">10.3 Protocol Agents</A><B> Up:</B> <A NAME="tex2html2861" HREF="node99.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node99.html">10. Agents</A><B> Previous:</B> <A NAME="tex2html2855" HREF="node100.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node100.html">10.1 Agent state</A>   <B> <A NAME="tex2html2863" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html2865" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <!--End of Navigation Panel--><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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