#!/bin/sh
# This is a shell archive (produced by GNU sharutils 4.2).
# To extract the files from this archive, save it to some FILE, remove
# everything before the `!/bin/sh' line above, then type `sh FILE'.
#
# Made on 2000-03-19 15:00 EST by <jcej@chiroptera.tragus.org>.
# Source directory was `/home/jcej/projects/ACE_wrappers/docs/tutorials/002'.
#
# Existing files will *not* be overwritten unless `-c' is specified.
#
# This shar contains:
# length mode name
# ------ ---------- ------------------------------------------
# 590 -rw-rw-r-- hdr
# 28 -rw-rw-r-- bodies
# 994 -rw-rw-r-- page01.pre
# 1816 -rw-rw-r-- page02.pre
# 100 -rw-rw-r-- page03.pre
# 429 -rw-rw-r-- page04.pre
#
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shar_touch=touch
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echo
$echo 'WARNING: not restoring timestamps. Consider getting and'
$echo "installing GNU \`touch', distributed in GNU File Utilities..."
echo
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#
if mkdir _sh32325; then
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$echo 'failed to create lock directory'
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# ============= hdr ==============
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<HTML>
<HEAD>
X <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
X <META NAME="GENERATOR" CONTENT="Mozilla/4.04 [en] (X11; I; Linux 2.0.32 i486) [Netscape]">
X <META NAME="Author" CONTENT="James CE Johnson">
X <META NAME="Description" CONTENT="A first step towards using ACE productively">
X <TITLE>ACE Tutorial 002</TITLE>
</HEAD>
<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
X
<CENTER><B><FONT SIZE=+2>ACE Tutorial 002</FONT></B></CENTER>
X
<CENTER><B><FONT SIZE=+2>Creating a Better Server</FONT></B></CENTER>
X
X
<P>
<HR WIDTH="100%">
SHAR_EOF
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$echo 'restore of' 'hdr' 'failed'
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1c8564e0ea8b3acd6438853dd2bc34d4 hdr
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# ============= bodies ==============
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$echo 'x -' extracting 'bodies' '(text)'
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PAGE=2
server.cpp
handler.h
SHAR_EOF
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# ============= page01.pre ==============
if test -f 'page01.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page01.pre' '(file already exists)'
else
$echo 'x -' extracting 'page01.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page01.pre' &&
X
<P>In this tutorial, we will build a little on what we learned in the first
tutorial and add a few extras. In the end, we will have a better server
object that is actually simpler and more maintainable than the one we created
before.</P>
X
<P>
<HR WIDTH="100%"></P>
X
<P>To begin, let's ask ourselves the same thing we did at the beginning
of tutorial 001:</P>
X
<UL>
<P>What do you need to create a server?</P>
</UL>
X
<OL>
<OL>
<LI>Something which accepts connections from clients</LI>
X
<LI>Something which handles established connections</LI>
X
<LI>A main program loop that handles it all</LI>
</OL>
</OL>
X
<P>Previously, we created a solution which addressed each one of these
questions specifically. At the end of it all, we realized that our only
application-specific coding was confined to the <I>handler</I> portion
of the program. We hinted that there may be a way to eliminate hand-coding
an <I>acceptor</I> each time we want to create a server. Here, we will
explore that approach.</P>
X
SHAR_EOF
$shar_touch -am 03191459100 'page01.pre' &&
chmod 0664 'page01.pre' ||
$echo 'restore of' 'page01.pre' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
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|| $echo 'page01.pre:' 'MD5 check failed'
ca5fd1b413d68211ee2e6d5132fd04d3 page01.pre
SHAR_EOF
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# ============= page02.pre ==============
if test -f 'page02.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page02.pre' '(file already exists)'
else
$echo 'x -' extracting 'page02.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page02.pre' &&
X
<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.
X
<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:
X
<P>
<HR WIDTH="100%">
SHAR_EOF
$shar_touch -am 03191459100 'page02.pre' &&
chmod 0664 'page02.pre' ||
$echo 'restore of' 'page02.pre' 'failed'
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596b8e60a2219f83cbe15600f0f2b29f page02.pre
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# ============= page03.pre ==============
if test -f 'page03.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page03.pre' '(file already exists)'
else
$echo 'x -' extracting 'page03.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page03.pre' &&
X
<P>Now lets take a look at the new <A HREF="handler.h">Logging_Handler</A>:
X
<P>
<HR WIDTH="100%">
SHAR_EOF
$shar_touch -am 03191459100 'page03.pre' &&
chmod 0664 'page03.pre' ||
$echo 'restore of' 'page03.pre' 'failed'
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&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'page03.pre:' 'MD5 check failed'
f62bcf39007ec332f581a0849e33fe50 page03.pre
SHAR_EOF
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# ============= page04.pre ==============
if test -f 'page04.pre' && test "$first_param" != -c; then
$echo 'x -' SKIPPING 'page04.pre' '(file already exists)'
else
$echo 'x -' extracting 'page04.pre' '(text)'
sed 's/^X//' << 'SHAR_EOF' > 'page04.pre' &&
X
<P>Well, that's it for the second tutorial. We've found a much easier way
to create a server, especially the acceptor part. At the same time, we
introduced more functionality and robustness. Not bad for a day's work.
<BR>
<UL>
<LI>
<A HREF="00SetEnv">Environment
Settings</A></LI>
X
<LI>
<A HREF="Makefile">Makefile</A></LI>
X
<LI>
<A HREF="server.cpp">server.cpp</A></LI>
<LI>
<A HREF="handler.h">handler.h</A></LI>
</UL>
X
SHAR_EOF
$shar_touch -am 03191459100 'page04.pre' &&
chmod 0664 'page04.pre' ||
$echo 'restore of' 'page04.pre' 'failed'
if ( md5sum --help 2>&1 | grep 'sage: md5sum \[' ) >/dev/null 2>&1 \
&& ( md5sum --version 2>&1 | grep -v 'textutils 1.12' ) >/dev/null; then
md5sum -c << SHAR_EOF >/dev/null 2>&1 \
|| $echo 'page04.pre:' 'MD5 check failed'
a215a80c256c303e810c97f0d92f311c page04.pre
SHAR_EOF
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$echo 'page04.pre:' 'original size' '429,' 'current size' "$shar_count!"
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rm -fr _sh32325
exit 0
