NAME

POE::Component::Win32::ChangeNotify - A POE wrapper around Win32::ChangeNotify.

SYNOPSIS

   use POE;
   use POE::Component::Win32::ChangeNotify;

   my ($poco) = POE::Component::Win32::ChangeNotify->spawn( alias => 'blah' );

   POE::Session->create(
        package_states => [ 
                'main' => [ qw(_start notification) ],
        ],
   );

   $poe_kernel->run();
   exit 0;

   sub _start {
     my ($kernel,$heap) = @_[KERNEL,HEAP];

     $kernel->post( 'blah' => monitor => 
     {
        'path' => '.',
        'event' => 'notification',
        'filter' => 'ATTRIBUTES DIR_NAME FILE_NAME LAST_WRITE SECURITY SIZE',
        'subtree' => 1,
     } );

     undef;
   }

   sub notification {
     my ($kernel,$hashref) = @_[KERNEL,ARG0];

     if ( $hashref->{error} ) {
        print STDERR $hashref->{error} . "\n";
     } else {
        print STDOUT "Something changed in " . $hashref->{path} . "\n";
     }
     $kernel->post( 'blah' => 'shutdown' );
     undef;
   }

DESCRIPTION

POE::Component::Win32::ChangeNotify is a POE wrapper around Win32::ChangeNotify that provides non-blocking change notify events to your POE sessions.

METHODS

spawn

Takes a number of arguments, all of which are optional. 'alias', the kernel alias to bless the component with; 'options', a hashref of POE::Session options that are passed to the component's session creator.

session_id

Takes no arguments, returns the POE::Session ID of the component. Useful if you don't want to use aliases.

INPUT

These are the events that the component will accept.

monitor

Starts monitoring the specified path for the specified types of changes.

Accepts one argument, a hashref containing the following keys: 'path', the filesystem path to monitor, mandatory; 'filter', a string containing whitespace or '|' separated notification flags, see Win32::ChangeNotify for details, defaults to all notification flags; 'subtree', set this to true value to monitor all subdirectories under 'path'; 'event', the event handler to post results back to, mandatory.

     $kernel->post( 'blah' => monitor => 
     {
        'path' => '.',
        'event' => 'notification',
        'filter' => 'ATTRIBUTES DIR_NAME FILE_NAME LAST_WRITE SECURITY SIZE',
        'subtree' => 1,
     } );
unmonitor

Stops monitoring the specified path.

Accepts one mandatory argument, 'path', the filesystem path to stop monitoring.

   $kernel->post( 'blah' => unmonitor => path => '.' );
shutdown

Has no arguments. Shuts down the component gracefully. All monitored paths will be closed.

OUTPUT

Each event sent by the component has a hashref as ARG0. This is the hashref that was passed to the component with monitor(). The key 'result' will be true if a change has occurred. The key 'error' will be set if an error occurred during the setup of the Win32::ChangeNotify object or when trying to call 'wait' on the object.

CAVEATS

This module will only work on Win32. But you guessed that already :)

AUTHOR

Chris Williams <chris@bingosnet.co.uk>

SEE ALSO

Win32::ChangeNotify