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Apache::Reload(3)                    User Contributed Perl Documentation                   Apache::Reload(3)



NAME
       Apache::Reload - Reload changed modules

SYNOPSIS
       In httpd.conf:

         PerlInitHandler Apache::Reload
         PerlSetVar ReloadAll Off

       Then your module:

         package My::Apache::Module;

         use Apache::Reload;

         sub handler { ... }

         1;

DESCRIPTION
       This module is two things. First it is an adaptation of Randal Schwartz's Stonehenge::Reload module
       that attempts to be a little more intuitive and makes the usage easier. Stonehenge::Reload was
       written by Randal to make specific modules reload themselves when they changed. Unlike
       Apache::StatINC, Stonehenge::Reload only checked the change time of modules that registered
       themselves with Stonehenge::Reload, thus reducing stat() calls. Apache::Reload also offers the exact
       same functionality as Apache::StatINC, and is thus designed to be a drop-in replacement.
       Apache::Reload only checks modules that register themselves with Apache::Reload if you explicitly
       turn off the StatINC emulation method (see below). Like Apache::StatINC, Apache::Reload must be
       installed as an Init Handler.

   StatINC Replacement
       To use as a StatINC replacement, simply add the following configuration to your httpd.conf:

         PerlInitHandler Apache::Reload

   Register Modules Implicitly
       To only reload modules that have registered with Apache::Reload, add the following to the httpd.conf:

         PerlInitHandler Apache::Reload
         PerlSetVar ReloadAll Off
         # ReloadAll defaults to On

       Then any modules with the line:

         use Apache::Reload;

       Will be reloaded when they change.

   Register Modules Explicitly
       You can also register modules explicitly in your httpd.conf file that you want to be reloaded on
       change:

         PerlInitHandler Apache::Reload
         PerlSetVar ReloadAll Off
         PerlSetVar ReloadModules "My::Foo My::Bar Foo::Bar::Test"

       Note that these are split on whitespace, but the module list must be in quotes, otherwise Apache
       tries to parse the parameter list.

   Un-Register Modules Explicitly
       If ReloadAll is set to On, then you can explicity force a module not to be reloaded with

         no Apache::Reload;

       A warning will appear in the error log that the file has changed, but will not be reloaded

   Special "Touch" File
       You can also set a file that you can touch() that causes the reloads to be performed. If you set
       this, and don't touch() the file, the reloads don't happen. This can be a great boon in a live
       environment:

         PerlSetVar ReloadTouchFile /tmp/reload_modules

       Now when you're happy with your changes, simply go to the command line and type:

         touch /tmp/reload_modules

       And your modules will be magically reloaded on the next request. This option works in both StatINC
       emulation mode and the registered modules mode.

PSUEDOHASHES
       The short summary of this is: Don't use psuedohashes. Use an array with constant indexes. Its faster
       in the general case, its more guaranteed, and generally, it works.

       The long summary is that I've done some work to get this working with modules that use psuedo hashes,
       but its still broken in the case of a single module that contains multiple packages that all use
       psuedohashes.

       So don't do that.

AUTHOR
       Matt Sergeant, matt@sergeant.org

MAINTAINERS
       the mod_perl developers, dev@perl.apache.org

SEE ALSO
       Apache::StatINC, Stonehenge::Reload



perl v5.16.2                                     2012-04-05                                Apache::Reload(3)