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Traffic generators can easily be connectedto UDP Agents.For protocols wishing to use a connection-oriented stream transport(like TCP), the various TCP Agents could be used.Finally, if a new transport or ``sub-transport'' protocolis to be developed, using <TT>Agent</TT>as the base class would likely be the best choice.In our example, we'll use Agent as the base class, given thatwe are constructing an agent logically belonging to the IP layer(or just above it).<P>We may use the following class definitions:<PRE> class ECHO_Timer; class ECHO_Agent : public Agent { public: ECHO_Agent(); int command(int argc, const char*const* argv); protected: void timeout(int); void sendit(); double interval_; ECHO_Timer echo_timer_; }; class ECHO_Timer : public TimerHandler { public: ECHO_Timer(ECHO_Agent *a) : TimerHandler() { a_ = a; } protected: virtual void expire(Event *e); ECHO_Agent *a_; };</PRE><P><HR><!--Navigation Panel--><A NAME="tex2html3056" HREF="node115.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node115.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html3050" HREF="node113.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node113.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html3044" HREF="node113.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node113.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html3052" 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="tex2html3054" 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="tex2html3057" HREF="node115.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node115.html">10.6.2 The recv() and</A><B> Up:</B> <A NAME="tex2html3051" HREF="node113.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node113.html">10.6 Creating a New</A><B> Previous:</B> <A NAME="tex2html3045" HREF="node113.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node113.html">10.6 Creating a New</A>   <B> <A NAME="tex2html3053" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html3055" 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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