use Moose;
+use Cwd qw( abs_path );
use File::ChangeNotify;
+use FindBin;
use namespace::clean -except => 'meta';
-has restart_sub => (
+has start_sub => (
is => 'ro',
isa => 'CodeRef',
required => 1,
);
+has argv => (
+ is => 'ro',
+ isa => 'ArrayRef',
+ required => 1,
+);
+
has _watcher => (
is => 'rw',
isa => 'File::ChangeNotify::Watcher',
isa => 'Int',
);
+sub pick_subclass {
+ my $class = shift;
+
+ my $subclass;
+ $subclass =
+ defined $ENV{CATALYST_RESTARTER}
+ ? $ENV{CATALYST_RESTARTER}
+ : $^O eq 'MSWin32'
+ ? 'Win32'
+ : 'Forking';
+
+ $subclass = 'Catalyst::Restarter::' . $subclass;
+
+ eval "use $subclass";
+ die $@ if $@;
+
+ return $subclass;
+}
+
sub BUILD {
my $self = shift;
my $p = shift;
- delete $p->{restart_sub};
+ delete $p->{start_sub};
- $p->{filter} ||= qr/(?:\/|^)(?!\.\#).+(?:\.yml$|\.yaml$|\.conf|\.pm)$/;
+ $p->{filter} ||= qr/(?:\/|^)(?![.#_]).+(?:\.yml$|\.yaml$|\.conf|\.pm)$/;
+ $p->{directories} ||= abs_path( File::Spec->catdir( $FindBin::Bin, '..' ) );
# We could make this lazily, but this lets us check that we
# received valid arguments for the watcher up front.
$self->_restart_on_changes;
}
-sub _fork_and_start {
- my $self = shift;
-
- if ( my $pid = fork ) {
- $self->_child($pid);
- }
- else {
- $self->restart_sub->();
- }
-}
-
sub _restart_on_changes {
my $self = shift;
- my @events = $self->_watcher->wait_for_events();
- $self->_handle_events(@events);
+ # We use this loop in order to avoid having _handle_events() call back
+ # into this method. We used to do that, and the end result was that stack
+ # traces become longer and longer with every restart. Using the loop, the
+ # portion of the stack trace that covers this code never changes.
+ while (1) {
+ my @events = $self->_watcher->wait_for_events();
+ $self->_handle_events(@events);
+ }
}
sub _handle_events {
$self->_kill_child;
$self->_fork_and_start;
-
- $self->_restart_on_changes;
-}
-
-sub _kill_child {
- my $self = shift;
-
- return unless $self->_child;
-
- return unless kill 0, $self->_child;
-
- local $SIG{CHLD} = 'IGNORE';
- unless ( kill 'INT', $self->_child ) {
- # The kill 0 thing does not work on Windows, but the restarter
- # seems to work fine on Windows with this hack.
- return if $^O eq 'MSWin32';
- die "Cannot send INT signal to ", $self->_child, ": $!";
- }
}
sub DEMOLISH {
=head1 NAME
-Catalyst::Restarter - Uses Catalyst::Watcher to check for changed files and restart the server
+Catalyst::Restarter - Uses File::ChangeNotify to check for changed files and restart the server
=head1 SYNOPSIS
- my $watcher = Catalyst::Watcher->new(
- directory => '/path/to/MyApp',
- regex => '\.yml$|\.yaml$|\.conf|\.pm$',
- interval => 3,
+ my $class = Catalyst::Restarter->pick_subclass;
+
+ my $restarter = $class->new(
+ directories => '/path/to/MyApp',
+ regex => '\.yml$|\.yaml$|\.conf|\.pm$',
+ start_sub => sub { ... }
);
- while (1) {
- my @changed_files = $watcher->watch();
- }
+ $restarter->run_and_watch;
=head1 DESCRIPTION
-This class monitors a directory of files for changes made to any file
-matching a regular expression. It correctly handles new files added to the
-application as well as files that are deleted.
+This is the base class for all restarters, and it also provide
+functionality for picking an appropriate restarter subclass for a
+given platform.
+
+This class uses L<File::ChangeNotify> to watch one or more directories
+of files and restart the Catalyst server when any of those files
+changes.
=head1 METHODS
-=head2 new ( directory => $path [, regex => $regex, delay => $delay ] )
+=head2 pick_subclass
+
+Returns the name of an appropriate subclass for the given platform.
+
+=head2 new ( start_sub => sub { ... }, ... )
+
+This method creates a new restarter object, but should be called on a
+subclass, not this class.
-Creates a new Watcher object.
+The "start_sub" argument is required. This is a subroutine reference
+that can be used to start the Catalyst server.
-=head2 find_changed_files
+=head2 run_and_watch
-Returns a list of files that have been added, deleted, or changed
-since the last time watch was called. Each element returned is a hash
-reference with two keys. The C<file> key contains the filename, and
-the C<status> key contains one of "modified", "added", or "deleted".
+This method forks, starts the server in a child process, and then
+watched for changed files in the parent. When files change, it kills
+the child, forks again, and starts a new server.
=head1 SEE ALSO
-L<Catalyst>, L<Catalyst::Restarter>, <File::Modified>
+L<Catalyst>, <File::ChangeNotify>
=head1 AUTHORS
projects / catagits/Catalyst-Devel.git / blobdiff