NAME
Mac::FSEvents - Monitor a directory structure for changes
SYNOPSIS
use Mac::FSEvents;
my $fs = Mac::FSEvents->new( {
path => '/', # required, the path to watch
latency => 2.0, # optional, time to delay before returning events
since => 451349510, # optional, return events from this eventId
flags => NONE, # optional, set stream creation flags
} );
my $fh = $fs->watch;
# Select on this filehandle, or use an event loop:
my $sel = IO::Select->new($fh);
while ( $sel->can_read ) {
my @events = $fs->read_events;
for my $event ( @events ) {
printf "Directory %s changed\n", $event->path;
}
}
# or use blocking polling:
while ( my @events = $fs->read_events ) {
...
}
# stop watching
$fs->stop;
DESCRIPTION
This module implements the FSEvents API present in Mac OSX 10.5 and
later. It enables you to watch a large directory tree and receive events
when any changes are made to directories or files within the tree.
Event monitoring occurs in a separate C thread from the rest of your
application.
METHODS
new ( { ARGUMENTS } )
Create a new watcher. A hash reference containing parameters is
required:
path Required. The full path to the directory to watch. All
subdirectories beneath this directory are watched.
latency Optional. The number of seconds the FSEvents service should
wait after hearing about an event from the kernel before
passing it along. Specifying a larger value may result in
fewer callbacks and greater efficiency on a busy filesystem.
Default: 2.0
since Optional. A previously obtained event ID may be passed as
the since argument. A notification will be sent for every
event that has happened since that ID. This can be useful
for seeing what has changed while your program was not
running.
flags Optional. Sets the flags provided to L<FSEventStreamCreate>.
In order to import the flag constants, you must provide
C<:flags> to C<use Mac::FSEvents>. The following flags are
supported:
NONE
WATCH_ROOT
IGNORE_SELF (Only available on OS X 10.6 or greater)
FILE_EVENTS (Only available on OS X 10.7 or greater)
Consult the FSEvents documentation for what these flags do.
Default: NONE
watch
Begin watching. Returns a filehandle that may be used with select()
or the event loop of your choice.
read_events
Returns an array of pending events. If using an event loop, this
method should be called when the filehandle becomes ready for
reading. If not using an event loop, this method will block until an
event is available.
Events are returned as Mac::FSEvents::Event objects.
stop
Stop watching.
SEE ALSO
http://developer.apple.com/documentation/Darwin/Conceptual/FSEvents_Prog
Guide
AUTHOR
Andy Grundman, <andy@hybridized.org>
COPYRIGHT AND LICENSE
Copyright (C) 2009 by Andy Grundman
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself, either Perl version 5.8.8 or, at
your option, any later version of Perl 5 you may have available.