1 package IPC::MorseSignals::Emitter;
7 use POSIX qw/SIGUSR1 SIGUSR2/;
8 use Time::HiRes qw/usleep/;
10 use Bit::MorseSignals::Emitter;
11 use base qw/Bit::MorseSignals::Emitter/;
15 IPC::MorseSignals::Emitter - Base class for IPC::MorseSignals emitters.
23 our $VERSION = '0.16';
27 use IPC::MorseSignals::Emitter;
29 my $deuce = IPC::MorseSignals::Emitter->new(speed => 1024);
30 $deuce->post('HLAGH') for 1 .. 3;
35 This module sends messages processed by an underlying L<Bit::MorseSignal> emitter to another process as a sequence of C<SIGUSR1> (for bits 0) and C<SIGUSR2> (for 1) signals.
40 croak 'First argument isn\'t a valid ' . __PACKAGE__ . ' object'
41 unless ref $_[0] and $_[0]->isa(__PACKAGE__);
48 my $ime = IPC::MorseSignals::Emitter->new(
54 Creates a new emitter object. C<delay> specifies the delay between two sends, in seconds, while C<speed> is the number of bits sent per second. The delay value has priority over the speed. Default delay is 1 second. Extra arguments are passed to L<Bit::MorseSignals::Emitter/new>.
60 $class = ref $class || $class || return;
61 croak 'Optional arguments must be passed as key => value pairs' if @_ % 2;
63 # delay supersedes speed
64 my $delay = delete $opts{delay}; # fractional seconds
65 if (!defined $delay) {
66 my $speed = delete $opts{speed} || 0; # bauds
68 $delay = abs(1 / $speed) if $speed;
70 my $self = $class->SUPER::new(%opts);
71 $self->{delay} = abs($delay || 1 + 0.0);
79 Sends messages enqueued with L<Bit::MorseSignals::Emitter/post> to the process C<$pid> (or to all the C<@$pid> if C<$pid> is an array reference, in which case duplicated targets are stripped off).
84 my ($self, $dest) = @_;
86 return unless defined $dest;
88 my @dests = grep $_ > 0 && !$count{$_}++, # Remove duplicates.
89 ref $dest eq 'ARRAY' ? map int, grep defined, @$dest
92 while (defined(my $bit = $self->pop)) {
93 my @sigs = (SIGUSR1, SIGUSR2);
94 my $d = $self->{delay} * 1_000_000;
95 $d -= usleep $d while $d > 0;
96 kill $sigs[$bit] => @dests;
102 my $delay = $ime->delay;
103 $ime->delay($seconds);
105 Returns the current delay in seconds, or set it if an argument is provided.
110 my ($self, $delay) = @_;
112 $self->{delay} = abs $delay if $delay and $delay += 0.0;
113 return $self->{delay};
118 my $speed = $ime->speed;
121 Returns the current speed in bauds, or set it if an argument is provided.
126 my ($self, $speed) = @_;
128 $self->{delay} = 1 / (abs $speed) if $speed and $speed = int $speed;
129 return int(1 / $self->{delay});
134 IPC::MorseSignals::Emitter objects also inherit methods from L<Bit::MorseSignals::Emitter>.
138 An object module shouldn't export any function, and so does this one.
142 L<Bit::MorseSignals::Emitter>.
144 L<Carp> (standard since perl 5), L<POSIX> (idem) and L<Time::HiRes> (since perl 5.7.3) are required.
148 L<IPC::MorseSignals>, L<IPC::MorseSignals::Receiver>.
150 L<Bit::MorseSignals>, L<Bit::MorseSignals::Emitter>, L<Bit::MorseSignals::Receiver>.
152 L<perlipc> for information about signals in perl.
154 For truly useful IPC, search for shared memory, pipes and semaphores.
158 Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
160 You can contact me by mail or on C<irc.perl.org> (vincent).
164 Please report any bugs or feature requests to C<bug-ipc-morsesignals-emitter at rt.cpan.org>, or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=IPC-MorseSignals>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
168 You can find documentation for this module with the perldoc command.
170 perldoc IPC::MorseSignals::Emitter
172 =head1 COPYRIGHT & LICENSE
174 Copyright 2007,2008,2013 Vincent Pit, all rights reserved.
176 This program is free software; you can redistribute it and/or modify it
177 under the same terms as Perl itself.
181 1; # End of IPC::MorseSignals::Emitter