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lib/Acme/Parataxis.pm  view on Meta::CPAN

            return ( ref $rv eq 'ARRAY' ) ? ( wantarray ? @$rv : $rv->[-1] ) : $rv;
        }

        method transfer (@args) {
            croak 'Cannot transfer to a finished fiber' if $self->is_done;
            my $rv = Acme::Parataxis::coro_transfer( $fid, \@args );
            if ( $self->is_done ) {
                my $err = $error;
                die $err if defined $err;
            }
            return unless defined $rv;
            return ( ref $rv eq 'ARRAY' ) ? ( wantarray ? @$rv : $rv->[-1] ) : $rv;
        }

        method is_done () {
            return 1 if $is_done;
            if ( defined $fid && $fid >= 0 && Acme::Parataxis::is_finished($fid) ) {
                $is_done = 1;
                my $old_fid = $fid;
                $fid = -1;
                delete $REGISTRY{$old_fid};
                Acme::Parataxis::destroy_coro($old_fid);
                return 1;
            }
            return 0;
        }

        method wait () {
            while ( !$self->is_done ) {
                Acme::Parataxis->yield('WAITING_FOR_CHILD');
            }
            return $self->result;
        }

        method DESTROY {
            return if ${^GLOBAL_PHASE} eq 'DESTRUCT';
            if ( defined $fid && $fid >= 0 ) {
                delete $REGISTRY{$fid};
                Acme::Parataxis::destroy_coro($fid);
                $fid = -1;
            }
        }
        sub by_id ( $class, $fid ) { $REGISTRY{$fid} }
    }
    class    #
        Acme::Parataxis::Root {

        method transfer (@args) {
            my $rv = Acme::Parataxis::coro_transfer( -1, \@args );
            return unless defined $rv;
            return ( ref $rv eq 'ARRAY' ) ? ( wantarray ? @$rv : $rv->[-1] ) : $rv;
        }
        method fid () {-1}
    }
    class    #
        Acme::Parataxis::Future {
        use Carp qw[croak];
        field $is_ready : reader = 0;
        field $result;
        field $error;
        field @callbacks;

        method result () {
            croak 'Future not ready' unless $is_ready;
            return $result;
        }

        method set_result ($val) {
            die 'Future already ready' if $is_ready;
            $result   = $val;
            $is_ready = 1;
            $_->($self) for @callbacks;
        }

        method set_error ($err) {
            die 'Future already ready' if $is_ready;
            $error    = $err;
            $is_ready = 1;
            $_->($self) for @callbacks;
        }

        method clear_result () {
            $result = undef;
            $error  = undef;
        }

        method on_ready ($cb) {
            if   ($is_ready) { $cb->($self) }
            else             { push @callbacks, $cb }
        }

        method await () {
            return $self->result if $is_ready;
            my $fid = Acme::Parataxis->current_fid;
            $self->on_ready(
                sub ($f) {
                    Acme::Parataxis::_scheduler_enqueue_by_id($fid);
                }
            );
            Acme::Parataxis->yield('WAITING');
            $self->result;
        }
    }
    END { cleanup() unless ${^GLOBAL_PHASE} eq 'DESTRUCT' }
}
1;