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<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<META NAME="Author" CONTENT="James CE Johnson">
<TITLE>ACE Tutorial 015</TITLE>
</HEAD>
<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
<CENTER><B><FONT SIZE=+2>ACE Tutorial 015</FONT></B></CENTER>
<CENTER><B><FONT SIZE=+2>Building a protocol stream</FONT></B></CENTER>
<P>
<HR WIDTH="100%">
The Client object is designed to hide all of the messy connection
logic from it's users. It also provides put/get methods for
sending data to the server and receiving the server's response.
Note the Protocol_Stream member that will take care of
converting and sending/receiving the data.
<HR>
<PRE>
<font color=red>// $Id$</font>
<font color=blue>#ifndef</font> <font color=purple>CLIENT_H</font>
<font color=blue>#define</font> <font color=purple>CLIENT_H</font>
<font color=blue>#include</font> "<A HREF="../../../ace/SOCK_Stream.h">ace/SOCK_Stream.h</A>"
<font color=blue>#if !defined</font> (<font color=purple>ACE_LACKS_PRAGMA_ONCE</font>)
<font color=blue># pragma</font> <font color=purple>once</font>
<font color=blue>#endif</font> <font color=red>/* ACE_LACKS_PRAGMA_ONCE */</font>
<font color=blue>#include</font> "<font color=green>Protocol_Stream.h</font>"
class ACE_Message_Block;
<font color=red>/* Hide the details of connection and protocol-conformance from the
application-level logic.
*/</font>
class Client
{
public:
<font color=red>// Provide the server information when constructing the</font>
<font color=red>// object. This could (and probably should) be moved to the</font>
<font color=red>// open() method.</font>
Client (u_short port,
const char *server);
<font color=red>// Cleanup...</font>
~Client (void);
<font color=red>// Open the connection to the server.</font>
int open (void);
<font color=red>// Close the connection to the server. Be sure to do this</font>
<font color=red>// before you let the Client go out of scope.</font>
int close (void);
<font color=red>// Put a message to the server. The Client assumes ownership of</font>
<font color=red>// <message> at that point and will release() it when done. Do not</font>
<font color=red>// use <message> after passing it to put().</font>
int put (ACE_Message_Block *message);
<font color=red>// Get a response from the server. The caller becomes the owner of</font>
<font color=red>// <response> after this call and is responsible for invoking</font>
<font color=red>// release() when done.</font>
int get (ACE_Message_Block *&response);
private:
<font color=red>// Protocol_Stream hides the protocol conformance details from us.</font>
Protocol_Stream stream_;
<font color=red>// We create a connection on the peer_ and then pass ownership of it</font>
<font color=red>// to the protocol stream.</font>
ACE_SOCK_Stream peer_;
<font color=red>// Endpoing information saved by the constructor for use by open().</font>
u_short port_;
const char *server_;
<font color=red>// Accessors for the complex member variables.</font>
Protocol_Stream &stream (void)
{
return this->stream_;
}
ACE_SOCK_Stream &peer (void)
{
return this->peer_;
}
};
<font color=blue>#endif</font> <font color=red>/* CLIENT_H */</font>
</PRE>
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