package Reflex::Role::Timeout; { $Reflex::Role::Timeout::VERSION = '0.098'; } # vim: ts=2 sw=2 noexpandtab use Reflex::Role; use Reflex::Event::Timeout; use Scalar::Util qw(weaken); attribute_parameter att_auto_start => "auto_start"; attribute_parameter att_delay => "delay"; callback_parameter cb_timeout => qw( on att_delay done ); method_parameter method_reset => qw( reset att_delay _ ); method_parameter method_start => qw( start att_delay _ ); method_parameter method_stop => qw( stop att_delay _ ); role { my $p = shift; my $att_delay = $p->att_delay(); my $att_auto_start = $p->att_auto_start(); my $cb_timeout = $p->cb_timeout(); requires $att_delay, $cb_timeout; has $att_auto_start => ( is => 'ro', isa => 'Bool', default => 1 ); my $method_reset = $p->method_reset(); my $method_start = $p->method_start(); my $method_stop = $p->method_stop(); my $timer_id_name = "${att_delay}_timer_id"; has $timer_id_name => ( isa => 'Maybe[Str]', is => 'rw', ); # Work around a Moose edge case. sub BUILD {} after BUILD => sub { my ($self, $args) = @_; $self->$method_start() if $self->$att_auto_start(); }; my $code_start = sub { my ($self, $args) = @_; # Switch to the proper session. return unless $self->call_gate($method_start); # If the args include "delay", then let's reset att_delay(). $self->$att_delay( $args->{delay} ) if exists $args->{delay}; # Stop a previous alarm. $self->$method_stop() if defined $self->$timer_id_name(); # Put a weak $self in an envelope that can be passed around # without strenghtening the object. my $envelope = [ $self, $cb_timeout, 'Reflex::Event::Timeout' ]; weaken $envelope->[0]; $self->$timer_id_name( $POE::Kernel::poe_kernel->delay_set( 'timer_due', $self->$att_delay(), $envelope, ) ); }; method $method_start => $code_start; method $method_reset => $code_start; after DEMOLISH => sub { my ($self, $args) = @_; $self->$method_stop(); }; method $method_stop => sub { my ($self, $args) = @_; # Return if it was a false "alarm" (pun intended). return unless ( defined $self->$timer_id_name() and $self->call_gate($method_stop) ); $POE::Kernel::poe_kernel->alarm_remove($self->$timer_id_name()); $self->$timer_id_name(undef); }; }; 1; =pod =for :stopwords Rocco Caputo =encoding UTF-8 =head1 NAME Reflex::Role::Timeout - set a wakeup callback for a relative delay =head1 VERSION This document describes version 0.098, released on June 05, 2012. =head1 SYNOPSIS package Reflex::Timeout; use Moose; extends 'Reflex::Base'; has delay => ( isa => 'Num', is => 'ro' ); has auto_start => ( isa => 'Bool', is => 'ro', default => 1 ); with 'Reflex::Role::Timeout' => { delay => "delay", cb_timeout => "on_done", att_auto_start => "auto_start", method_start => "start", method_stop => "stop", method_reset => "reset", }; 1; =head1 DESCRIPTION Reflex::Role::Timeout is a parameterized role. Each time it's consumed, it adds another non-blocking relative delay callback to a class. These callback will be invoked after a particular number of seconds have elapsed. The delay is contained in an attribute named by the role's C parameter. Reflex::Timeout in the SYNOPSIS consumes a single Reflex::Role::Timeout. The parameters define the names of attributes that control the timer's behavior, the names of callback methods, and the names of methods that manipulate the timer. =head2 Required Role Parameters None. All role parameters have defaults. =head2 Optional Role Parameters =head3 delay C names an attribute in the consumer that must hold the role's inactivity time, in seconds. The role will trigger a callback after that amount of time has elapsed, unless the timeout is stopped or reset before then. Reflex usually supports fractional seconds, but this ultimately depends on the event loop being used. Refex::Role::Timeout uses the attribute name in C to differentiate between multiple applications of the same role to the same class. Reflex roles are building blocks of program behavior, and it's reasonable to expect a class to need multiple building blocks of the same type. For instance, a login prompt may have a short timeout to wait for input and a longer timeout to wait for authentication. =head3 auto_start Timeouts will automatically start if the value of the attribute named in C is true. Otherwise, the class consuming this role must call the role's start method, named in C. =head3 method_stop Reflex::Role::Timeout will provide a method to stop the timer. This method will become part of the consuming class, per Moose. C allows the consumer to define the name of that method. By default, the method will be named: $method_stop = "stop_" . $delay_name; where $delay_name is the attribute name supplied by the C parameter. The stop method neither takes parameters nor returns anything. =head3 method_reset C allows the role's consumer to override the default reset method name. The default is C<"reset_${timeout_name}">, where $timeout_name is the attribute name provided in the C parameter. All Reflex methods accept a hashref of named parameters. Currently the reset method accepts one named parameter, "delay". The value of "delay" must be the new timeout to trigger a callback. If "delay" isn't provided, the timeout callback will happen at the previous time set by this module. $self->reset_name( { delay => 60 } ); One may also set the delay attribute and reset the timer as two distinct calls. $self->delay( 60 ); # 60 seconds from now $self->reset_name(); =head3 method_start This role provides a method to start timeouts, otherwise timeouts would never run if C were false. The C can be used to override the default start method name, which is "start_${delay_name}". $delay_name is the name of the attribute provided in the C role parameter. =head3 cb_timeout C overrides the default method name that will be called when the "when" time arrives. The default is "on_${when_name}_done". These callbacks receive no paramaters. =head1 EXAMPLES L is one example of using Reflex::Role::Timeout. =head1 SEE ALSO Please see those modules/websites for more information related to this module. =over 4 =item * L =item * L =item * L =item * L =item * L =item * L =item * L =item * L =item * L =item * L =item * L =item * L =item * L =back =head1 BUGS AND LIMITATIONS You can make new bug reports, and view existing ones, through the web interface at L. =head1 AUTHOR Rocco Caputo =head1 COPYRIGHT AND LICENSE This software is copyright (c) 2012 by Rocco Caputo. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. =head1 AVAILABILITY The latest version of this module is available from the Comprehensive Perl Archive Network (CPAN). Visit L to find a CPAN site near you, or see L. =head1 DISCLAIMER OF WARRANTY BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. =cut __END__