diff options
Diffstat (limited to 'docs/tutorials/015/page10.html')
| -rw-r--r-- | docs/tutorials/015/page10.html | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/docs/tutorials/015/page10.html b/docs/tutorials/015/page10.html deleted file mode 100644 index 476dfe3c7a0..00000000000 --- a/docs/tutorials/015/page10.html +++ /dev/null @@ -1,126 +0,0 @@ -<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%"> -And so finally we come to the Protocol_Stream. That, after all, is -the focus of the entire tutorial but it took us half of the day to get -here! -<P> -The Protocol_Stream uses an ACE_Stream to move an ACE_Message_Block -through a series of tasks. Each task in the stream is responsible for -performing some operation on the data in the message block. That is -the nature of a protocol stream (or "stack" if you prefer). In this -stream, the data is compressed and encrypted* on its way between -peers. We also allow users of the stream to install a reader task to -handle data that percolates up from the peer. As you saw a page or -two ago, this is most useful for a server. - -<P> -<font size=-1>*Again, I just pretend to do these things. It would -take another day or two to go through any sort of reasonable -encryption or compression!</font> -<P> -Before we get into the code, here's a picture that's shows what's -going on here. -<P><center><img src="stream.gif"></center></p> -<HR> -<PRE> - -<font color=red>// $Id$</font> - -<font color=blue>#ifndef</font> <font color=purple>PROTOCOL_STREAM_H</font> -<font color=blue>#define</font> <font color=purple>PROTOCOL_STREAM_H</font> - -<font color=blue>#include</font> "<font color=green>ace/SOCK_Stream.h</font>" - -<font color=blue>#if !defined</font> (<font color=purple>ACE_LACKS_PRAGMA_ONCE</font>) -# pragma once -<font color=blue>#endif</font> <font color=red>/* ACE_LACKS_PRAGMA_ONCE */</font> - -<font color=blue>#include</font> "<font color=green>ace/Stream.h</font>" - -<font color=red>// Shorthand for the stream.</font> -typedef ACE_Stream<ACE_MT_SYNCH> Stream; - -<font color=red>// Forward references to cut down on the number of <font color=blue>#include</font>s</font> -class ACE_Message_Block; -class Recv; -class Protocol_Task; - -<font color=red>/* The Protocol_Stream provides a tidy interface to an ACE_Stream - setup to process a data block through a series of protocol stages. -*/</font> -class Protocol_Stream -{ -public: - Protocol_Stream(void); - ~Protocol_Stream(void); - - <font color=red>// Provide the stream with an ACE_SOCK_Stream on which it can</font> - <font color=red>// communicate. If _reader is non-null, it will be added as</font> - <font color=red>// the reader task just below the stream head so that it can</font> - <font color=red>// process data read from the peer.</font> - int open( ACE_SOCK_Stream & _peer, Protocol_Task * _reader = 0 ); - - <font color=red>// Close the stream. All of the tasks & modules will also be closed.</font> - int close(void); - - <font color=red>// putting data onto the stream will pass it through all</font> - <font color=red>// protocol levels and send it to the peer.</font> - int put( ACE_Message_Block * & _message, ACE_Time_Value * - _timeout = 0 ); - - <font color=red>// get will cause the Recv task (at the tail of the stream) to</font> - <font color=red>// read some data from the peer and pass it upstream. The</font> - <font color=red>// message block is then taken from the stream reader task's</font> - <font color=red>// message queue.</font> - int get( ACE_Message_Block * & _response, ACE_Time_Value * - _timeout = 0 ); - - <font color=red>// Tell the Recv task to read some data and send it upstream.</font> - <font color=red>// The data will pass through the protocol tasks and be queued</font> - <font color=red>// into the stream head reader task's message queue. If</font> - <font color=red>// you've installed a _reader in open() then that task's</font> - <font color=red>// recv() method will see the message and may consume it</font> - <font color=red>// instead of passing it to the stream head for queueing.</font> - int get(void); - - ACE_SOCK_Stream & peer(void) - { - return this->peer_; - } - -private: - <font color=red>// Our peer connection</font> - ACE_SOCK_Stream peer_; - - <font color=red>// The stream managing the various protocol tasks</font> - Stream stream_; - - <font color=red>// A task which is capable of receiving data on a socket.</font> - <font color=red>// Note that this is only useful by client-side applications.</font> - Recv * recv_; - - Stream & stream(void) - { - return this->stream_; - } - - <font color=red>// Install the protocol tasks into the stream.</font> - int open(void); -}; - -<font color=blue>#endif</font> <font color=red>// PROTOCOL_STREAM_H</font> -</PRE> -<P><HR WIDTH="100%"> -<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page11.html">Continue This Tutorial</A>]</CENTER> |