File::ChangeNotify::Watcher(3pm)			User Contributed Perl Documentation			  File::ChangeNotify::Watcher(3pm)

NAME

       File::ChangeNotify::Watcher - Base class for all watchers

VERSION

       version 0.22

SYNOPSIS

	   my $watcher =
	       File::ChangeNotify->instantiate_watcher
		   ( directories => [ '/my/path', '/my/other' ],
		     filter	 => qr/.(?:pm|conf|yml)$/,
		     exclude	 => ['t', 'root', qr(/(?!.)[^/]+$)],
		   );

	   if ( my @events = $watcher->new_events() ) { ... }

	   # blocking
	   while ( my @events = $watcher->wait_for_events() ) { ... }

DESCRIPTION

       A "File::ChangeNotify::Watcher" class monitors a directory for changes made to any file. You can provide a regular expression to filter out
       files you are not interested in. It handles the addition of new subdirectories by adding them to the watch list.

       Note that the actual granularity of what each watcher subclass reports may vary across subclasses. Implementations that hook into some sort
       of kernel event interface (Inotify, for example) have much better knowledge of exactly what changes are happening than one implemented
       purely in userspace code (like the Default subclass).

       By default, events are returned in the form File::ChangeNotify::Event objects, but this can be overridden by providing an "event_class"
       attribute to the constructor.

       The watcher can operate in a blocking/callback style, or you can simply ask it for a list of new events as needed.

METHODS

   File::ChangeNotify::Watcher::Subclass->new(...)
       This method creates a new watcher. It accepts the following arguments:

       o   directories => $path

       o   directories => @paths

	   This argument is required. It can be either one or many paths which should be watched for changes.

       o   filter => qr/.../

	   This is an optional regular expression that will be used to check if a file is of interest. This filter is only applied to files.

	   By default, all files are included.

       o   exclude => [...]

	   An optional list of paths to exclude. This list can contain either plain strings or regular expressions. If you provide a string it
	   should contain the complete path to be excluded.

	   The paths can be either directories or specific files. If the exclusion matches a directory, all of its files and subdirectories are
	   ignored.

       o   follow_symlinks => $bool

	   By default, symlinks are ignored. Set this to true to follow them.

	   If this symlinks are being followed, symlinks to files and directories will be followed. Directories will be watched, and changes for
	   directories and files reported.

       o   sleep_interval => $number

	   For watchers which call "sleep" to implement the "$watcher->wait_for_events()" method, this argument controls how long it sleeps for.
	   The value is a number in seconds.

	   The default is 2 seconds.

       o   event_class => $class

	   This can be used to change the class used to report events. By default, this is File::ChangeNotify::Event.

   $watcher->wait_for_events()
       This method causes the watcher to block until it sees interesting events, and then return them as a list.

       Some watcher subclasses may implement blocking as a sleep loop, while others may actually block.

   $watcher->new_events()
       This method returns a list of any interesting events seen since the last time the watcher checked.

   $watcher->sees_all_events()
       If this is true, the watcher will report on all events.

       Some watchers, like the Default subclass, are not smart enough to track things like a file being created and then immediately deleted, and
       can only detect changes between snapshots of the file system.

       Other watchers, like the Inotify subclass, see all events that happen and report on them.

AUTHOR

       Dave Rolsky <autarch@urth.org>

COPYRIGHT AND LICENSE

       This software is Copyright (c) 2012 by Dave Rolsky.

       This is free software, licensed under:

	 The Artistic License 2.0 (GPL Compatible)

perl v5.14.2							    2012-04-14					  File::ChangeNotify::Watcher(3pm)