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=begin pod
=TITLE class IO::Notification
=SUBTITLE Asynchronous notification for file and directory changes
X<|FileChangeEvent (enum)>
X<|FileChanged (FileChangeEvent)>
X<|FileRenamed (FileChangeEvent)>
=for code
enum FileChangeEvent (:FileChanged(1), :FileRenamed(2));
=for code :skip-test<compile time error>
class IO::Notification {
class Change {
has $.path;
has $.event;
C<$path)> produces a L<Supply|/type/Supply>
of C<IO::Notification::Change> events for a file or directory.
Here is a small example that prints the first ten
C<FileChanged>-notifications for the current working directory:
=for code
my $finish =;
my $count = 0;$*CWD).act( -> $change {
$count++ if $change.event ~~ FileChanged;
say "($count) $change.path(): $change.event()";
$finish.keep if $count >= 10;
await $finish;
The type of the change is very much dependent both on the platform and
on specific system calls that were used initiate the change. At this
point in time you should not rely on the type of change in general, and
test your particular situation.
=head1 Methods
=head2 method watch-path
=for code
method watch-path(IO::Notification: Str() $path, :$scheduler = $*SCHEDULER)
Returns a L<Supply|/type/Supply> that emits C<IO::Notification::Change> objects.
If C<$path> is a file, only modifications of that file are reported. If
C<$path> is a directory, both modifications to the directory itself (for
example permission changes) and to files in the directory (including new
files in the directory) are reported.
C<:$scheduler> allows you to specify which thread scheduler is
responsible for the notification stream.
=end pod