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| author | nobody <nobody@ae88bc3d-4319-0410-8dbf-d08b4c9d3795> | 2003-12-14 16:03:49 +0000 |
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| committer | nobody <nobody@ae88bc3d-4319-0410-8dbf-d08b4c9d3795> | 2003-12-14 16:03:49 +0000 |
| commit | d005604f2267dd36077e7cd378e15f81cd11dd60 (patch) | |
| tree | a47852c86fd4a118701e9bf2b3854525f21077d1 /docs/tutorials/002/page02.html | |
| parent | a7e10f0b431dc0e2006196751782cd8fa40b16c7 (diff) | |
| download | ATCD-d005604f2267dd36077e7cd378e15f81cd11dd60.tar.gz | |
This commit was manufactured by cvs2svn to create branch
'unlabeled-1.120.2'.
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| -rw-r--r-- | docs/tutorials/002/page02.html | 159 |
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diff --git a/docs/tutorials/002/page02.html b/docs/tutorials/002/page02.html deleted file mode 100644 index 42d7a8eefcc..00000000000 --- a/docs/tutorials/002/page02.html +++ /dev/null @@ -1,159 +0,0 @@ -<!-- $Id$ --> -<HTML> -<HEAD> - <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> - <META NAME="GENERATOR" CONTENT="Mozilla/4.04 [en] (X11; I; Linux 2.0.32 i486) [Netscape]"> - <META NAME="Author" CONTENT="James CE Johnson"> - <META NAME="Description" CONTENT="A first step towards using ACE productively"> - <TITLE>ACE Tutorial 002</TITLE> -</HEAD> -<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F"> - -<CENTER><B><FONT SIZE=+2>ACE Tutorial 002</FONT></B></CENTER> - -<CENTER><B><FONT SIZE=+2>Creating a Better Server</FONT></B></CENTER> - - -<P> -<HR WIDTH="100%"> - -<P>Like Tutorial 1, this is also a rather small program. I'm going -to add a couple of new ideas along the way but to make up for it I'm also -going to simplify the acceptor a great deal. - -<P> -Kirthika's Abstract: -<UL> -This is a server example made simpler due to the use of off-the-shelf -components and classes from ACE. -<P> -Here, the Logging_Acceptor is an ACE_Acceptor class which is associated -with the Logging_Handler and the ACE_SOCK_ACCEPTOR. This will now -accept connection requests from the clients on being opened with the -reactor instance passed to it. -<P> -We also implement a signal to capture CTRL-C [ which generates SIGINT ] using ACE_SigAction and -ACE_SignalHandler. This signal can now be used to stop the reactor -from handling events. -<P> -Then, the reactor is allowed to loop infintely until it is shut down -using a ^C, after which both the reactor as well as the acceptor are -destroyed. -<P> -The Logging_Handler derives from the ACE_Svc_Handler instead of the -Event_Handler since the Svc_Handler has inbuilt SOCK_Stream and -provides all the calls needed by the reactor. The Svc_Handler has the -ability to react to events and communicate to remote tasks using the -underlying data stream passed to it. -<P> -A timer is scheduled in the reactor which does nothing but simply -display how it could be used to provide periodic processing when -needed. The ACE_TimeValue is used to set the time period. -<P> -Also, optimisations have been made in the form of a separate function -for -destroying the objects used. -<P> -Thus a simpler server has now been built which successfully -demonstrates how simple a task, writing a server can become on using -the various ACE components judiciously. -</UL> -<P>We begin by looking at the <A HREF="server.cpp">main (server.cpp)</A> portion program: - -<P> -<HR WIDTH="100%"> -<PRE> -<font color=red>// $Id$</font> - -<font color=red>/* As before, we need a few ACE objects as well as our Logging_Handler - declaration. */</font> -<font color=blue>#include</font> "<A HREF="../../../ace/Acceptor.h">ace/Acceptor.h</A>" -<font color=blue>#include</font> "<A HREF="../../../ace/SOCK_Acceptor.h">ace/SOCK_Acceptor.h</A>" -<font color=blue>#include</font> "<A HREF="../../../ace/Reactor.h">ace/Reactor.h</A>" -<font color=blue>#include</font> "<font color=green>handler.h</font>" - -<font color=red>/* We'll still use the global reactor pointer. There's a snappy way - around this that shows up in later server tutorials. */</font> -ACE_Reactor *g_reactor; - -<font color=red>/* This was hinted at in Tutorial 1. Remember the hand-coded acceptor - that we created there? This template does all of that and more and - better. If you find yourself creating code that doesn't feel like a - part of your application, there's a good chance that ACE has a - template or framework component to do it for you. */</font> -typedef ACE_Acceptor <Logging_Handler, ACE_SOCK_ACCEPTOR> Logging_Acceptor; - -<font color=red>/* One of the new things will be a signal handler so that we can exit - the application somewhat cleanly. The 'finished' flag is used - instead of the previous infninite loop and the 'handler' will set - that flag in respose to SIGINT (CTRL-C). - The invocation of <font color=#008888>ACE_Reactor::notify</font>() will cause the - handle_events() to return so that we can see the new value of 'finished'. -*/</font> -static sig_atomic_t finished = 0; -extern "<font color=green>C</font>" void handler (int) -{ - finished = 1; - g_reactor->notify(); -} - -static const u_short PORT = ACE_DEFAULT_SERVER_PORT; - -int -main (int, char **) -{ - <font color=red>// Create the reactor we'll register our event handler derivatives with.</font> - ACE_NEW_RETURN (g_reactor, - ACE_Reactor, - 1); - - <font color=red>// Create the acceptor that will listen for client connetions</font> - Logging_Acceptor peer_acceptor; - - <font color=red>/* Notice how similar this is to the open() call in Tutorial 1. I - read ahead when I created that one so that it would come out this - way... */</font> - if (peer_acceptor.open (ACE_INET_Addr (PORT), - g_reactor) == -1) - ACE_ERROR_RETURN ((LM_ERROR, - "<font color=green>%p\n</font>", - "<font color=green>open</font>"), - -1); - - <font color=red>/* Here's the easiest way to respond to signals in your application. - Simply construct an ACE_Sig_Action object with a "<font color=green>C</font>" function and - the signal you want to capture. As you might expect, there is - also a way to register signal handlers with a reactor but we take - the easy-out here. */</font> - ACE_Sig_Action sa ((ACE_SignalHandler) handler, SIGINT); - - ACE_DEBUG ((LM_DEBUG, - "<font color=green>(%P|%t) starting up server logging daemon\n</font>")); - - <font color=red>// Perform logging service until the signal handler receives SIGINT.</font> - while (!finished) - g_reactor->handle_events (); - - <font color=red>// Close the acceptor so that no more clients will be taken in.</font> - peer_acceptor.close(); - - <font color=red>// Free up the memory allocated for the reactor.</font> - delete g_reactor; - - ACE_DEBUG ((LM_DEBUG, - "<font color=green>(%P|%t) shutting down server logging daemon\n</font>")); - return 0; -} - -<font color=blue>#if defined</font> (<font color=purple>ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION</font>) -template class ACE_Acceptor <Logging_Handler, ACE_SOCK_ACCEPTOR>; -template class ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>; -<font color=blue>#elif defined</font> (<font color=purple>ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA</font>) -<font color=blue>#pragma</font> <font color=purple>instantiate</font> ACE_Acceptor <Logging_Handler, ACE_SOCK_ACCEPTOR> -<font color=blue>#pragma</font> <font color=purple>instantiate</font> ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH> -<font color=blue>#endif</font> <font color=red>/* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */</font> - -</PRE> -<P><HR WIDTH="100%"> -<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page03.html">Continue This Tutorial</A>]</CENTER> - |