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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)
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