NAME POE::Component::DirWatch - POE directory watcher SYNOPSIS use POE::Component::DirWatch; my $watcher = POE::Component::DirWatch->new ( alias => 'dirwatch', directory => '/some_dir', filter => sub { $_[0]->is_file ? $_[0] =~ /\.gz$/ : 1 }, dir_callback => sub{ ... }, file_callback => sub{ ... }, interval => 1, ); $poe_kernel->run; DESCRIPTION POE::Component::DirWatch watches a directory for files or directories. Upon finding either it will invoke a user-supplied callback function depending on whether the item is a file or directory. ASYNCHRONOUS IO SUPPORT This object supports asynchronous IO access using IO::AIO. At load time, the class will detect whether IO::AIO is present in the host system and, if it is present, apply the POE::Component::DirWatch::Role::AIO role to the current class, adding the "aio" attribute, the event, and replacing "_poll" with an asynchronous version. If you do not wish to use AIO you can specify so with he "no_aio" flag like this: use POE::Component::DirWatch (no_aio => 1); ATTRIBUTES alias Read only alias for the DirWatch session. Defaults to "dirwatch" if not specified. You can NOT rename a session at runtime. directory Read-write, required. A Path::Class::Dir object for the directory watched. Automatically coerces strings into Path::Class::Dir objects. interval Required read-write integer representing interval between the end of a poll event and the scheduled start of the next. Defaults to 1. file_callback has_file_callback - predicate clear_file_callback - clearer Optional read-write code reference to call when a file is found. The code reference will passed a single argument, a Path::Class::File object representing the file found. It usually makes most sense to process the file and remove it from the directory to avoid duplicate processing dir_callback has_dir_callback - predicate clear_dir_callback - clearer Optional read-write code reference to call when a directory is found. The code reference will passed a single argument, a Path::Class::Dir object representing the directory found. filter has_filter - predicate clear_filter - clearer An optional read-write code reference that, if present, will be called for each item in the watched directory. The code reference will passed a single argument, a Path::Class::File or Path::Class::Dir object representing the file/dir found. The code should return true if the callback should be called and false if the file should be ignored. next_poll has_next_poll - predicate clear_next_poll - clearer The ID of the alarm for the next scheduled poll, if any. Has clearer and predicate methods named "clear_next_poll" and "has_next_poll". Please note that clearing the "next_poll" just clears the next poll id, it does not remove the alarm, please use "pause" for that. OBJECT METHODS new( \%attrs) See SYNOPSIS and ATTRIBUTES. session Returns a reference to the actual POE session. Please avoid this unless you are subclassing. Even then it is recommended that it is always used as "$watcher->session->method" because copying the object reference around could create a problem with lingering references. pause [$until] Synchronous call to _pause. This just posts an immediate _pause event to the kernel. resume [$when] Synchronous call to _resume. This just posts an immediate _resume event to the kernel. shutdown Convenience method that posts a FIFO shutdown event. meta See Moose; EVENT HANDLING METHODS These methods are not part of the public interface of this class, and expect to be called from whithin POE with the standard positional arguments. Use them at your own risk. _start Runs when "$poe_kernel->run" is called to set the session's alias and schedule the first "poll" event. _poll Triggered by the "poll" event this is the re-occurring action. _poll will use get a list of all items in the directory and call the appropriate callback. _file_callback Will execute the "file_callback" code reference, if any. _pause [$until] Triggered by the "_pause" event this method will remove the alarm scheduling the next directory poll. It takes an optional argument of $until, which dictates when the polling should begin again. If $until is an integer smaller than the result of time() it will treat $until as the number of seconds to wait before polling. If $until is an integer larger than the result of time() it will treat $until as an epoch timestamp. #these two are the same thing $watcher->pause( time() + 60); $watcher->pause( 60 ); #this is one also the same $watcher->pause; $watcher->resume( 60 ); _resume [$when] Triggered by the "_resume" event this method will remove the alarm scheduling the next directory poll (if any) and schedule a new poll alarm. It takes an optional argument of $when, which dictates when the polling should begin again. If $when is an integer smaller than the result of time() it will treat $until as the number of seconds to wait before polling. If $until is an integer larger than the result of time() it will treat $when as an epoch timestamp and schedule the poll alarm accordingly. If not specified, the alarm will be scheduled with a delay of zero. _shutdown Delete the "heap", remove the alias we are using and remove all set alarms. BUILD Constructor. "create()"s a POE::Session. TODO More examples More tests ChangeNotify support (patches welcome!) SEE ALSO POE::Session, POE::Component, Moose, POE, The git repository for this project can be found in on github, AUTHOR Guillermo Roditi, BUGS Please report any bugs or feature requests to "bug-poe-component-dirwatch at rt.cpan.org", or through the web interface at . I will be notified, and then you'll automatically be notified of progress on your bug as I make changes. ACKNOWLEDGEMENTS #poe & #moose on irc.perl.org Matt S Trout Rocco Caputo Charles Reiss Stevan Little Eric Cholet COPYRIGHT Copyright 2006-2008 Guillermo Roditi. This is free software; you may redistribute it and/or modify it under the same terms as Perl itself.