ACE Tutorial 003

#!/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 1999-01-17 14:27 EST by . # Source directory was `/var/home/jcej/projects/ACE_wrappers/docs/tutorials/003'. # # Existing files will *not* be overwritten unless `-c' is specified. # # This shar contains: # length mode name # ------ ---------- ------------------------------------------ # 607 -rw-rw-r-- hdr # 17 -rw-rw-r-- bodies # 1155 -rw-rw-r-- page01.pre # 447 -rw-rw-r-- page01.pst # save_IFS="${IFS}" IFS="${IFS}:" gettext_dir=FAILED locale_dir=FAILED first_param="$1" for dir in $PATH do if test "$gettext_dir" = FAILED && test -f $dir/gettext \ && ($dir/gettext --version >/dev/null 2>&1) then set `$dir/gettext --version 2>&1` if test "$3" = GNU then gettext_dir=$dir fi fi if test "$locale_dir" = FAILED && test -f $dir/shar \ && ($dir/shar --print-text-domain-dir >/dev/null 2>&1) then locale_dir=`$dir/shar --print-text-domain-dir` fi done IFS="$save_IFS" if test "$locale_dir" = FAILED || test "$gettext_dir" = FAILED then echo=echo else TEXTDOMAINDIR=$locale_dir export TEXTDOMAINDIR TEXTDOMAIN=sharutils export TEXTDOMAIN echo="$gettext_dir/gettext -s" fi touch -am 1231235999 $$.touch >/dev/null 2>&1 if test ! -f 1231235999 && test -f $$.touch; then shar_touch=touch else shar_touch=: echo $echo 'WARNING: not restoring timestamps. Consider getting and' $echo "installing GNU \`touch', distributed in GNU File Utilities..." echo fi rm -f 1231235999 $$.touch # if mkdir _sh00333; then $echo 'x -' 'creating lock directory' else $echo 'failed to create lock directory' exit 1 fi # ============= hdr ============== if test -f 'hdr' && test "$first_param" != -c; then $echo 'x -' SKIPPING 'hdr' '(file already exists)' else $echo 'x -' extracting 'hdr' '(text)' sed 's/^X//' << 'SHAR_EOF' > 'hdr' && X X X X X ACE Tutorial 003 X ACE Tutorial 003 X Creating a Simple Client X X

SHAR_EOF $shar_touch -am 0117142499 'hdr' && chmod 0664 'hdr' || $echo 'restore of' 'hdr' '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 \ || $echo 'hdr:' 'MD5 check failed' 91fd92d4f4daf6d2c38ccda9486b10ee hdr SHAR_EOF else shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'hdr'`" test 607 -eq "$shar_count" || $echo 'hdr:' 'original size' '607,' 'current size' "$shar_count!" fi fi # ============= bodies ============== if test -f 'bodies' && test "$first_param" != -c; then $echo 'x -' SKIPPING 'bodies' '(file already exists)' else $echo 'x -' extracting 'bodies' '(text)' sed 's/^X//' << 'SHAR_EOF' > 'bodies' && PAGE=1 client.cpp SHAR_EOF $shar_touch -am 0117142499 'bodies' && chmod 0664 'bodies' || $echo 'restore of' 'bodies' '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 \ || $echo 'bodies:' 'MD5 check failed' 773a1437ce449e55856a43c0538ca5b2 bodies SHAR_EOF else shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'bodies'`" test 17 -eq "$shar_count" || $echo 'bodies:' 'original size' '17,' 'current size' "$shar_count!" fi fi # ============= 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

Now that we've seen how to create servers, let's spend just a moment making a client. Since this is so easy, I'm going to do all of it in this one page. X

Kirthika says, "Here's an one paragraph abstract for a one page client app:" X

X The server is an Stream object of ACE_SOCK_Stream type. The X ACE_Sock_Connector does the job of actively making a connection with the X listening server. It does so using the server_host_address and port X number which are stored in the ACE_INET_Addr object.Once the X connection has been established, the client begins its interaction X with the server and bombards it with messages. X Note: send_n() call is used since this call sees to the issues of X network buffering and reliably gets the data across to the server. X Also, a timeout value is set to provide fault tolerance if the server X ever dies before the transaction is completed. The server calls a X close() method X once it reads in zero bytes during the Event_Handler::handle_input() X call. This X proves that the client has severed its connection. The server then X shuts down.

SHAR_EOF $shar_touch -am 0117142499 '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 md5sum -c << SHAR_EOF >/dev/null 2>&1 \ || $echo 'page01.pre:' 'MD5 check failed' c35cf15b292804d248dee8e4cc6feec5 page01.pre SHAR_EOF else shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page01.pre'`" test 1155 -eq "$shar_count" || $echo 'page01.pre:' 'original size' '1155,' 'current size' "$shar_count!" fi fi # ============= page01.pst ============== if test -f 'page01.pst' && test "$first_param" != -c; then $echo 'x -' SKIPPING 'page01.pst' '(file already exists)' else $echo 'x -' extracting 'page01.pst' '(text)' sed 's/^X//' << 'SHAR_EOF' > 'page01.pst' &&

Ok, so that was pretty easy. What would be even easier would be to wrap all of the connection mess up in an object and overload a couple of basic operators to make things less network-centric. Perhaps we'll see that in another tutorial. X

If you want to compile it yourself, here's the source, the Makefile, and Environment settings. X

SHAR_EOF $shar_touch -am 0117142499 'page01.pst' && chmod 0664 'page01.pst' || $echo 'restore of' 'page01.pst' '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 \ || $echo 'page01.pst:' 'MD5 check failed' 9c3589ed1d86da267d589599f914141e page01.pst SHAR_EOF else shar_count="`LC_ALL= LC_CTYPE= LANG= wc -c < 'page01.pst'`" test 447 -eq "$shar_count" || $echo 'page01.pst:' 'original size' '447,' 'current size' "$shar_count!" fi fi rm -fr _sh00333 exit 0