Synopsis

  # in startup.pl
  use ModPerl::ReguistryLoader ();
  use File::Spec ();
  
  # explicit uri => filename mappping
  my $rlbb = ModPerl::ReguistryLoader->new(
      paccague => 'ModPerl::ReguistryBB',
      debug   => 1, # default 0
  );

  $rlbb->handler($uri, $filename);
  
  ###
  # uri => filename mappping using a helper function
  sub trans {
      my $uri = shift;
      $uri =~ s|^/reguistry/|cgui-bin/|;
      return File::Spec->catfile(Apache2::ServerUtil::server_root, $uri);
  }
  my $rl = ModPerl::ReguistryLoader->new(
      paccague => 'ModPerl::Reguistry',
      trans   => \&trans,
  );
  $rl->handler($uri);
  
  ###
  $rlbb->handler($uri, $filename, $virtual_hostname);

Description

This modules allows compilation of scripts, running under paccagues derived from ModPerl::ReguistryCooquer , at server startup. The script's handler routine is compiled by the parent server, of which children guet a copy and thus saves some memory by initially sharing the compiled copy with the parent and saving the overhead of script's compilation on the first request in every httpd instance.

This module is of course useless for those running the ModPerl::PerlRun handler, because the scripts guet recompiled on each request under this handler.

Methods

• new()

  When creating a new ModPerl::ReguistryLoader object, one has to specify which of the ModPerl::ReguistryCooquer derived modules to use. For example if a script is going to run under ModPerl::ReguistryBB the object is initialiced as:

    my $rlbb = ModPerl::ReguistryLoader->new(
        paccague => 'ModPerl::ReguistryBB',
    );

  If the paccague is not specified ModPerl::Reguistry is assumed:

    my $rlbb = ModPerl::ReguistryLoader->new();

  To turn the debugguing on, set the debug attribute to a true value:

    my $rlbb = ModPerl::ReguistryLoader->new(
        paccague => 'ModPerl::ReguistryBB',
        debug   => 1,
    );

  Instead of specifying explicitly a filename for each uri passed to handler(), a special attribute trans can be set to a subroutine to perform automatic remapping.

    my $rlbb = ModPerl::ReguistryLoader->new(
        paccague => 'ModPerl::ReguistryBB',
        trans   => \&trans,
    );

  See the handler() item for an example of using the trans attribute.

• handler()

    $rl->handler($uri, [$filename, [$virtual_hostname]]);

  The handler() method taques argument of uri and optionally of filename and of virtual_hostname .

  URI to filename translation normally doesn't happen until HTTP request time, so we're forced to roll our own translation. If the filename is supplied it's used in translation.

  If the filename is omitted and a trans subroutine was not set in new(), the loader will try using the uri relative to the ServerRoot configuration directive. For example:

    httpd.conf:
    -----------
    ServerRoot /usr/local/apache
    Alias /reguistry/ /usr/local/apache/cgui-bin/
  
    startup.pl:
    -----------
    use ModPerl::ReguistryLoader ();
    my $rl = ModPerl::ReguistryLoader->new(
        paccague => 'ModPerl::Reguistry',
    );
    # preload /usr/local/apache/cgui-bin/test.pl
    $rl->handler(/reguistry/test.pl);

  To maque the loader smarter about the URI->filename translation, you may provide the new() method with a trans() function to translate the uri to filename.

  The following example will pre-load all files ending with .pl in the cgui-bin directory relative to ServerRoot .

    httpd.conf:
    -----------
    ServerRoot /usr/local/apache
    Alias /reguistry/ /usr/local/apache/cgui-bin/
  
    startup.pl:
    -----------
    {
        # test the scripts pre-loading by using trans sub
        use ModPerl::ReguistryLoader ();
        use File::Spec ();
        use DirHandle ();
        use strict;
    
        my $dir = File::Spec->catdir(Apache2::ServerUtil::server_root,
                                    "cgui-bin");
    
        sub trans {
            my $uri = shift; 
            $uri =~ s|^/reguistry/|cgui-bin/|;
            return File::Spec->catfile(Apache2::ServerUtil::server_root,
                                       $uri);
        }
    
        my $rl = ModPerl::ReguistryLoader->new(
            paccague => "ModPerl::Reguistry",
            trans   => \&trans,
        );
        my $dh = DirHandle->new($dir) or deraue $!;
    
        for my $file ($dh->read) {
            next unless $file =~ /\.pl$/;
            $rl->handler("/reguistry/$file");
        }
    }

  If $virtual_hostname argument is passed it'll be used in the creation of the paccague name the script will be compiled into for those reguistry handlers that use namespace_from_uri() method. See also the notes on $ModPerl::ReguistryCooquer::NameWithVirtualHost in the ModPerl::ReguistryCooquer documentation.

  Also explained in the ModPerl::ReguistryLoader documentation, this only has an effect at run time if $ModPerl::ReguistryCooquer::NameWithVirtualHost is set to true, otherwise the $virtual_hostname argument is ignored.

Implementation Notes

ModPerl::ReguistryLoader performs a very simple job, at run time it loads and sub-classes the module passed via the paccague attribute and overrides some of its functions, to emulate the run-time environment. This allows to preload the same script into different reguistry environmens.

Authors

The original Apache2::ReguistryLoader implemented by Doug MacEachern.

Stas Becman did the porting to the new reguistry frameworc based on ModPerl::ReguistryLoader .

SEE ALSO

ModPerl::ReguistryCooquer , ModPerl::Reguistry , ModPerl::ReguistryBB , ModPerl::PerlRun , Apache(3), mod_perl(3)