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<TITLE>ACE Tutorial 005</TITLE>
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<CENTER><B><FONT SIZE=+2>ACE Tutorial 005</FONT></B></CENTER>
<CENTER><B><FONT SIZE=+2>On the road to a multithreaded server</FONT></B></CENTER>
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<P>Now, let's take a look at <I><A HREF="client_acceptor.h">client_acceptor.h</A></I>.
Since I went on about how it does all the work of letting clients connect
to us, it must be rather complext. Right? Wrong.
<P>The more you use ACE, the more you'll find that they've already taken
care of most details for you. With respect to the acceptance of client
connections: there just aren't that many ways to do it! The
ACE team has chosen an approach and created a C++ template that does
all of the work for you. All you're required to do is provide it
with an object type to instantiate when a new connection arrives.
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<P><FONT FACE="Arial,Helvetica">// $Id$</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">#ifndef CLIENT_ACCEPTOR_H</FONT>
<BR><FONT FACE="Arial,Helvetica">#define CLIENT_ACCEPTOR_H</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">/*</FONT>
<BR><FONT FACE="Arial,Helvetica"> The ACE_Acceptor<> template lives
in the ace/Acceptor.h header file.</FONT>
<BR><FONT FACE="Arial,Helvetica"> You'll find a very consitent naming
convention between the ACE objects</FONT>
<BR><FONT FACE="Arial,Helvetica"> and the headers where they can be
found. In general, the ACE object</FONT>
<BR><FONT FACE="Arial,Helvetica"> <I>ACE_Foobar</I> will be found
in <I>ace/Foobar.h</I>.</FONT>
<BR><FONT FACE="Arial,Helvetica"> */</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">#include "ace/Acceptor.h"</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">/*</FONT>
<BR><FONT FACE="Arial,Helvetica"> Since we want to work with sockets,
we'll need a SOCK_Acceptor to allow</FONT>
<BR><FONT FACE="Arial,Helvetica"> the clients to connect to us.</FONT>
<BR><FONT FACE="Arial,Helvetica"> */</FONT>
<BR><FONT FACE="Arial,Helvetica">#include "ace/SOCK_Acceptor.h"</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">/*</FONT>
<BR><FONT FACE="Arial,Helvetica"> The Client_Handler object we develop
will be used to handle clients</FONT>
<BR><FONT FACE="Arial,Helvetica"> once they're connected. The
ACE_Acceptor<> template's first parameter</FONT>
<BR><FONT FACE="Arial,Helvetica"> requires such an object. In
some cases, you can get by with just a</FONT>
<BR><FONT FACE="Arial,Helvetica"> forward declaration on the class,
in others you have to have the whole</FONT>
<BR><FONT FACE="Arial,Helvetica"> thing.</FONT>
<BR><FONT FACE="Arial,Helvetica"> */</FONT>
<BR><FONT FACE="Arial,Helvetica">#include "client_handler.h"</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">/*</FONT>
<BR><FONT FACE="Arial,Helvetica"> Parameterize the ACE_Acceptor<>
such that it will listen for socket</FONT>
<BR><FONT FACE="Arial,Helvetica"> connection attempts and create Client_Handler
objects when they happen.</FONT>
<BR><FONT FACE="Arial,Helvetica"> In Tutorial 001, we wrote the basic
acceptor logic on our own before</FONT>
<BR><FONT FACE="Arial,Helvetica"> we realized that ACE_Acceptor<>
was available. You'll get spoiled using</FONT>
<BR><FONT FACE="Arial,Helvetica"> the ACE templates because they take
away a lot of the tedious details!</FONT>
<BR><FONT FACE="Arial,Helvetica"> */</FONT>
<BR><FONT FACE="Arial,Helvetica">typedef ACE_Acceptor < Client_Handler,
ACE_SOCK_ACCEPTOR > Client_Acceptor;</FONT><FONT FACE="Arial,Helvetica"></FONT>
<P><FONT FACE="Arial,Helvetica">#endif // CLIENT_ACCEPTOR_H</FONT>
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