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<font size=+0 face=verdana,arial>
<font face=verdana><font class=title size=+1 color=#555555><b>EVENTS</b></font>
</font>
<hr size=1>
<table width=100% border=0 cellpadding=1 cellspacing=3>
<tr>
<td valign=top><font face="lucida console" size=-1>
<tr>
<td valign=top >
<font face="lucida console" size=-1>
<a href=#Overview>Overview</a>
</font>
</td>
<td valign=top >
<font face="lucida console" size=-1>
<a href=#Script_OnPar383e5cdf>Script_OnParse</a>
</font>
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<td valign=top >
<font face="lucida console" size=-1>
<a href=#Script_OnSta6a4cfa7f>Script_OnStart & Script_OnEnd</a>
</font>
</td>
<td valign=top >
<font face="lucida console" size=-1>
<a href=#Application_61345d1d>Application_OnStart</a>
</font>
</td>
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<td valign=top >
<font face="lucida console" size=-1>
<a href=#Session_OnSt3cfacd72>Session_OnStart</a>
</font>
</td>
<td valign=top >
<font face="lucida console" size=-1>
<a href=#Application_4bca009c>Application_OnEnd</a>
</font>
</td>
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<td valign=top >
<font face="lucida console" size=-1>
<a href=#Session_OnEne9575396>Session_OnEnd</a>
</font>
</td>
<td valign=top >
<font face="lucida console" size=-1>
<a href=#Server_OnSta0d174f59>Server_OnStart ( pseudo-event )</a>
</font>
</td>
</tr>
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<td valign=top >
<font face="lucida console" size=-1>
<a href=#Script_OnFludc73a8d8>Script_OnFlush</a>
</font>
</td>
<td valign=top >
<font face="lucida console" size=-1>
<a href=#mod_perl%20han02da5c9c>mod_perl handlers</a>
</font>
</td>
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</table>
<hr size=1>
<p>
<p>
<a name=Overview></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Overview</b></font>
<font face="courier new" size=3><pre>
</pre></font>The ASP platform allows developers to create Web Applications.
In fulfillment of real software requirements, ASP allows
event-triggered actions to be taken, which are defined in
a global.asa file. The global.asa file resides in the
Global directory, defined as a config option, and may
define the following actions:
<font face="courier new" size=3><pre>
Action Event
------ ------
Script_OnStart * Beginning of Script execution
Script_OnEnd * End of Script execution
Script_OnFlush * Before $Response being flushed to client.
Script_OnParse * Before script compilation
Application_OnStart Beginning of Application
Application_OnEnd End of Application
Session_OnStart Beginning of user Session.
Session_OnEnd End of user Session.
* These are API extensions that are not portable, but were
added because they are incredibly useful
</pre></font>These actions must be defined in the $Global/global.asa file
as subroutines, for example:
<font face="courier new" size=3><pre>
sub Session_OnStart {
$Application->{$Session->SessionID()} = started;
}
</pre></font>Sessions are easy to understand. When visiting a page in a
web application, each user has one unique $Session. This
session expires, after which the user will have a new
$Session upon revisiting.
<font face="courier new" size=3><pre>
</pre></font>A web application starts when the user visits a page in that
application, and has a new $Session created. Right before
the first $Session is created, the $Application is created.
When the last user $Session expires, that $Application
expires also. For some web applications that are always busy,
the Application_OnEnd event may never occur.</font>
<p>
<a name=Script_OnSta6a4cfa7f></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Script_OnStart & Script_OnEnd</b></font>
<font face="courier new" size=3><pre>
</pre></font>The script events are used to run any code for all scripts
in an application defined by a global.asa. Often, you would
like to run the same code for every script, which you would
otherwise have to add by hand, or add with a file include,
but with these events, just add your code to the global.asa,
and it will be run.
<font face="courier new" size=3><pre>
</pre></font>There is one caveat. Code in Script_OnEnd is not guaranteed
to be run when $Response->End() is called, since the program
execution ends immediately at this event. To always run critical
code, use the API extension:
<font face="courier new" size=3><pre>
$Server->RegisterCleanup()
</pre></font>
<p>
<a name=Session_OnSt3cfacd72></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Session_OnStart</b></font>
<font face="courier new" size=3><pre>
</pre></font>Triggered by the beginning of a user's session, Session_OnStart
gets run before the user's executing script, and if the same
session recently timed out, after the session's triggered Session_OnEnd.
<font face="courier new" size=3><pre>
</pre></font>The Session_OnStart is particularly useful for caching database data,
and avoids having the caching handled by clumsy code inserted into
each script being executed.</font>
<p>
<a name=Session_OnEne9575396></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Session_OnEnd</b></font>
<font face="courier new" size=3><pre>
</pre></font>Triggered by a user session ending, Session_OnEnd can be useful
for cleaning up and analyzing user data accumulated during a session.
<font face="courier new" size=3><pre>
</pre></font>Sessions end when the session timeout expires, and the StateManager
performs session cleanup. The timing of the Session_OnEnd does not
occur immediately after the session times out, but when the first
script runs after the session expires, and the StateManager allows
for that session to be cleaned up.
<font face="courier new" size=3><pre>
</pre></font>So on a busy site with default SessionTimeout (20 minutes) and
StateManager (10 times) settings, the Session_OnEnd for a particular
session should be run near 22 minutes past the last activity that Session saw.
A site infrequently visited will only have the Session_OnEnd run
when a subsequent visit occurs, and theoretically the last session
of an application ever run will never have its Session_OnEnd run.
<font face="courier new" size=3><pre>
</pre></font>Thus I would not put anything mission-critical in the Session_OnEnd,
just stuff that would be nice to run whenever it gets run.</font>
<p>
<a name=Script_OnFludc73a8d8></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Script_OnFlush</b></font>
<font face="courier new" size=3><pre>
</pre></font>API extension. This event will be called prior to flushing
the $Response buffer to the web client. At this time,
the $Response->{BinaryRef} buffer reference may be used to modify
the buffered output at runtime to apply global changes to scripts
output without having to modify all the scripts.
<font face="courier new" size=3><pre>
sub Script_OnFlush {
my $ref = $Response->{BinaryRef};
$$ref =~ s/\s+/ /sg; # to strip extra white space
}
</pre></font>Check out the <a href=eg/global.asa>./site/eg/global.asa</a> for an example of its use.</font>
<p>
<a name=Script_OnPar383e5cdf></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Script_OnParse</b></font>
<font face="courier new" size=3><pre>
</pre></font>This event allows one to set up a source filter on the script text,
allowing one to change the script on the fly before the compilation
stage occurs. The script text is available in the $Server->{ScriptRef}
scalar reference, and can be accessed like so:
<font face="courier new" size=3><pre>
sub Script_OnParse {
my $code = $Server->{ScriptRef}
$$code .= " ADDED SOMETHING ";
}
</pre></font>
<p>
<a name=Application_61345d1d></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Application_OnStart</b></font>
<font face="courier new" size=3><pre>
</pre></font>This event marks the beginning of an ASP application, and
is run just before the Session_OnStart of the first Session
of an application. This event is useful to load up
$Application with data that will be used in all user sessions.</font>
<p>
<a name=Application_4bca009c></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Application_OnEnd</b></font>
<font face="courier new" size=3><pre>
</pre></font>The end of the application is marked by this event, which
is run after the last user session has timed out for a
given ASP application.</font>
<p>
<a name=Server_OnSta0d174f59></a>
<font face=verdana><font class=title size=+0 color=#555555><b>Server_OnStart ( pseudo-event )</b></font>
<font face="courier new" size=3><pre>
</pre></font>Some might want something like a Server_OnStart event, where
some code gets runs when the web server starts. In <a href=http://perl.apache.org><font size=-1 face=verdana><b>mod_perl</b></font></a>,
this is easy to achieve outside of the scope of an ASP
application, by putting some initialization code into
a <Perl> section in the httpd.conf file. Initializations
that you would like to be shared with the child httpds are
particularly useful, one such being the Apache::ASP->Loader()
routine which you can read more about in the <a href=tuning.html><font size=-1 face=verdana><b>TUNING</b></font></a> section -
Precompile Scripts subsection. It is could be called like:
<font face="courier new" size=3><pre>
# httpd.conf
<Perl>
Apache::ASP->Loader($path, $pattern, %config)
</Perl>
</pre></font>So a <Perl> section is your Server_OnStart routine!</font>
<p>
<a name=mod_perl%20han02da5c9c></a>
<font face=verdana><font class=title size=+0 color=#555555><b>mod_perl handlers</b></font>
<font face="courier new" size=3><pre>
</pre></font>If one wants to extend one's environment with <a href=http://perl.apache.org><font size=-1 face=verdana><b>mod_perl</b></font></a>
handlers, Apache::ASP does not stop this. Basic
use of Apache::ASP in fact only involves the content
handler phase of mod_perl's PerlHandler, like
<font face="courier new" size=3><pre>
SetHandler perl-script
PerlModule Apache::ASP
PerlHandler Apache::ASP
</pre></font>But mod_perl allows for direct access to many more
Apache event stages, for full list try "perldoc mod_perl"
or buy the mod_perl Eagle book. Some commonly used ones are:
<font face="courier new" size=3><pre>
PerlInitHandler
PerlTransHandler
PerlFixupHandler
PerlHandler
PerlLogHandler
PerlCleanupHandler
</pre></font>For straight Apache::ASP programming, there are some
equivalents, say Script_OnStart event instead of Init/Fixup
stages, or $Server->RegisterCleanup() for Log/Cleanup stages,
but you can do things in the mod_perl handlers that you
cannot do in Apache::ASP, especially if you want to handle
all files globally, and not just ASP scripts.
<font face="courier new" size=3><pre>
</pre></font>For many Apache::* modules for use with mod_perl, of which
Apache::ASP is just one, check out
<a href=http://perl.apache.org/src/apache-modlist.html>http://perl.apache.org/src/apache-modlist.html</a>
<font face="courier new" size=3><pre>
</pre></font>To gain access to the ASP objects like $Session outside
in a non-PerlHandler mod_perl handler, you may use this API:
<font face="courier new" size=3><pre>
my $ASP = Apache::ASP->new($r); # $r is Apache->request object
</pre></font>as in this possible Authen handler:
<font face="courier new" size=3><pre>
<Perl>
use Apache::ASP;
sub My::Auth::handler {
my $r = shift;
my $ASP = Apache::ASP->new($r)
my $Session = $ASP->Session;
}
</Perl>
</pre></font>Here are some examples of do-it-yourself mod_perl
handler programming...
<font face="courier new" size=3><pre>
=== Forbid Bad HSlide User Agent ===
# httpd.conf
PerlAccessHandler My::Access
<Perl>
sub My::Access::handler {
my $r = shift;
if($r->headers_in->{'USER_AGENT'} =~ /HSlide/) {
403;
} else {
200;
}
}
</Perl>
=== Runtime Path Parsing ===
</pre></font>This example shows how one might take an arbitrary
URL path /$path/$file.asp, and turn that into a runtime
config for your site, so your scripts get executed
always in your sites DocumentRoot.
<font face="courier new" size=3><pre>
INPUT URL /SomeCategory/
OUTPUT
Script: index.asp
$Server->Config('PATH') eq '/SomeCategory'
INPUT URL /SomeCategory/index.asp
OUTPUT
Script: index.asp
$Server->Config('PATH') eq '/SomeCategory'
INPUT URI /index.asp
OUTPUT
Script: index.asp
$Server->Config('PATH') eq ''
# httpd.conf
PerlTransHandler My::Init
use lib qw( $custom_perllib );
# $custom_perllib/My/Init.pm
package My::Init;
use strict;
use Apache::Constants qw(:common);
sub handler {
my $r = shift;
my $uri = $r->uri || '/';
unless($uri =~ m|^(.*)(/([^/.]+\.[\w]+)?)$|i) {
warn("can't parse uri $uri");
return DECLINED;
}
$uri = $2;
my $PATH = $1 || '';
$r->dir_config('PATH', $PATH);
if($uri eq '/') {
$uri = '/index.asp';
}
$r->uri($uri);
$r->filename($r->document_root.$uri);
DECLINED;
}
1;
</pre></font>
</font>
</td>
<td bgcolor=white valign=top>
</td>
</tr>
<tr bgcolor=#063678>
<td colspan=3 align=center width=80%>
<font face=verdana color=white size=-1>
Copyright © 1998-2008,
<a href=http://www.chamas.com><font color=white>Chamas Enterprises Inc.</font></a>
</font>
</td>
</tr>
</table>
</td></tr>
</table>
</center>
</body>
</html>
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