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package Reflex::POE::Wheel; |
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# vim: ts=2 sw=2 noexpandtab |
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$Reflex::POE::Wheel::VERSION = '0.100'; |
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624
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use Moose; |
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extends 'Reflex::Base'; |
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4995
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use Scalar::Util qw(weaken); |
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use POE::Wheel; |
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457
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has wheel => ( |
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isa => 'Maybe[POE::Wheel]', |
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is => 'rw', |
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); |
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my %wheel_id_to_object; |
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sub BUILD { |
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my ($self, $args) = @_; |
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my $wheel_class = $self->wheel_class(); |
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# Get rid of stuff we don't need. |
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foreach my $param (keys %$args) { |
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100
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delete $args->{$param} unless exists $self->valid_params()->{$param}; |
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} |
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# Map methods to events in the wheel parameters. |
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my $events_to_indices = $self->events_to_indices(); |
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while (my ($wheel_param, $event_idx) = each %$events_to_indices) { |
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$args->{$wheel_param} = "wheel_event_$event_idx"; |
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} |
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32
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$self->create_wheel($wheel_class, $args); |
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} |
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sub create_wheel { |
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my ($self, $wheel_class, $args) = @_; |
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38
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100
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return unless $self->call_gate("create_wheel", $wheel_class, $args); |
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40
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my $wheel = $wheel_class->new( %$args ); |
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7266
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$self->wheel($wheel); |
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43
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$wheel_id_to_object{$wheel->ID()} = $self; |
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weaken $wheel_id_to_object{$wheel->ID()}; |
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} |
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47
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sub wheel_id { |
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2
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2
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1
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3
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my $self = shift; |
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2
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54
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return $self->wheel()->ID(); |
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} |
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52
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sub put { |
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0
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0
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1
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my $self = shift; |
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0
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0
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$self->wheel()->put(@_); |
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} |
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57
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sub DEMOLISH { |
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2
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2
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0
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3
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my $self = shift; |
59
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2
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9
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$self->demolish_wheel(); |
60
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} |
61
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62
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sub demolish_wheel { |
63
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2
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2
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1
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2
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my $self = shift; |
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2
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50
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33
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56
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return unless defined($self->wheel()) and $self->call_gate("demolish_wheel"); |
65
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2
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25
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delete $wheel_id_to_object{ $self->wheel_id() }; |
66
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2
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59
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$self->wheel(undef); |
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} |
68
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69
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sub deliver { |
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17
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17
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0
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39
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my ($class, $event_idx, @event_args) = @_; |
71
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72
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# Map parameter offsets to named parameters. |
73
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17
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53
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my ($event_type, $event_name, @field_names) = $class->index_to_event( |
74
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$event_idx |
75
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); |
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77
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17
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23
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my $i = 0; |
78
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17
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25
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my %event_args = map { $_ => $event_args[$i++] } @field_names; |
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40
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111
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79
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80
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# Get the wheel that sent us an event. |
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82
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17
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33
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my $wheel_id = delete $event_args{wheel_id}; |
83
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17
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17
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delete $event_args{_discard_}; |
84
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85
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# Get the Reflex::Base object that owns this wheel. |
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87
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my $self = $wheel_id_to_object{$wheel_id}; |
88
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50
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36
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die unless $self; |
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90
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# Emit the event. |
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81
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$self->emit( |
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-name => $event_name, |
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-type => $event_type, |
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%event_args |
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); |
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} |
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98
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__PACKAGE__->meta->make_immutable; |
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100
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1; |
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102
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__END__ |
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104
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=pod |
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106
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=encoding UTF-8 |
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108
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=for :stopwords Rocco Caputo |
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110
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=head1 NAME |
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Reflex::POE::Wheel - Base class for POE::Wheel wrappers. |
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114
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=head1 VERSION |
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116
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This document describes version 0.100, released on April 02, 2017. |
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118
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=head1 SYNOPSIS |
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120
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There is no concise synopsis at this time. Setting up a new |
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Reflex::POE::Wheel is rather involved. The source for |
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L<Reflex::POE::Wheel::Run> may serve as an example. |
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=head1 DESCRIPTION |
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126
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Reflex::POE::Wheel is a base class for Reflex objects that wrap and |
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watch POE::Wheel objects. Subclasses define a handful of methods |
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that describe the wheels they wrap. Reflex::POE::Wheel will use the |
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configuration to validate constructor parameters, map wheel events to |
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Reflex events, and map positional callback parameters to named ones. |
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It's rather handy once you get used to it. |
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134
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=head2 Public Attributes |
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136
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=head3 wheel |
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138
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Currently Reflex::POE::Wheel exposes the raw POE::Wheel via its |
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wheel() attribute. This will be undefined if the wheel hasn't been |
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set up yet. |
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142
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=head2 Public Methods |
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144
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=head3 wheel_id |
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146
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The wheel_id() method returns the ID of the POE::Wheel being managed. |
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C<< $foo->wheel()->ID() >> can also be used instead. |
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149
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=head3 demolish_wheel |
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151
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Cause the internal wheel to be demolished. Provided as a method since |
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some wheels may require special handling. |
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154
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=head3 put |
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156
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put() sends its parameters to the POE::Wheel's put() method. |
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158
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$reflex_poe_wheel->put("one", "two"); |
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160
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=head2 Required Subclass Methods |
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162
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These subclass methods are used to configure subclasses for their |
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chosen POE::Wheel objects. |
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165
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=head3 event_to_index |
166
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167
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event_to_index() maps POE::Wheel events to consecutive integer event |
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IDs. event_emit_names() will provide Reflex-friendly event names |
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based on the event IDs. event_param_names() will provide parameter |
170
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names that correspond to the wheel's positional parameters. |
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172
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This mapping is from Reflex::POE::Wheel::Run. It will make more sense |
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in the context of event_emit_names() and event_param_names(). |
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175
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sub event_to_index { |
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return( |
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{ |
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StdinEvent => 0, |
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StdoutEvent => 1, |
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StderrEvent => 2, |
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ErrorEvent => 3, |
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CloseEvent => 4, |
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}, |
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); |
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} |
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187
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=head3 event_emit_names |
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189
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event_emit_names() returns an array reference that maps |
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Reflex::POE::Wheel's event IDs to Reflex-friendly event names. |
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192
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Here's an example from Reflex::POE::Wheel::Run. The wheel's |
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StdinEvent (ID 0) is emitted as "stdin" (the 0th element in |
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event_emit_names()). StdoutEvent becomes "stdout", and so on. |
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196
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sub event_emit_names { |
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return( |
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[ |
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'stdin', # StdinEvent |
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'stdout', # StdoutEvent |
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'stderr', # StderrEvent |
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'error', # ErrorEvent |
203
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'closed', # ClosedEvent |
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], |
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); |
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} |
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208
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=head3 event_param_names |
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210
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event_param_names() returns an array reference that maps |
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Reflex::POE::Wheel's event IDs to Reflex-friendly lists of parameter |
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names. The underlying POE::Wheel's positional parameters will be |
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mapped to these names before the Reflex object emits them. |
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215
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Here's yet another example from Reflex::POE::Wheel::Run. StdinEvent |
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and StdoutEvent each return two parameters. The Reflex object will |
217
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emit their ARG0 as the named parameter "output", and ARG1 becomes the |
218
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named parameter "wheel_id". |
219
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220
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sub event_param_names { |
221
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return( |
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[ |
223
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[ "wheel_id" ], |
224
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[ "output", "wheel_id" ], |
225
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[ "output", "wheel_id" ], |
226
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[ "operation", "errnum", "errstr", "wheel_id", "handle_name" ], |
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[ "wheel_id" ], |
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] |
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); |
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} |
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=head3 wheel_class |
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wheel_class() returns a simple string---the class name of the wheel to |
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construct. |
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=head3 valid_params |
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The valid_params() method returns a hash reference keyed on valid |
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constructor parameters. Values don't matter at this time. |
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Reflex::POE::Wheel uses this hash reference to pre-validate |
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construction of underlying POE::Wheel objects. |
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POE::Wheel::Run takes quite a lot of parameters, most of which are |
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optional. |
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sub valid_params { |
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return( |
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{ |
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CloseOnCall => 1, |
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Conduit => 1, |
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Filter => 1, |
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Group => 1, |
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NoSetPgrp => 1, |
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NoSetSid => 1, |
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Priority => 1, |
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Program => 1, |
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ProgramArgs => 1, |
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StderrDriver => 1, |
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StderrFilter => 1, |
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StdinDriver => 1, |
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StdinFilter => 1, |
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StdioDriver => 1, |
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StdioFilter => 1, |
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StdoutDriver => 1, |
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StdoutFilter => 1, |
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User => 1, |
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} |
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); |
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} |
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=for Pod::Coverage BUILD DEMOLISH create_wheel deliver |
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=head1 CAVEATS |
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The demolish() name is heading towards deprecation in favor of |
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something shorter and more widely recognized, perhaps stop(). The |
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jury is still out, however. |
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Methods are not yet converted automatically. It seems more sensible |
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to provide a native Reflex::Base interface. On the other hand, it |
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may be possible for Moose's "handles" attribute option to pass the |
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wheel's methods through the wrapper. More investigation is required. |
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wheel() or wheel_id() will be deprecated, depending upon which is |
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considered redundant. |
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=head1 SEE ALSO |
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Please see those modules/websites for more information related to this module. |
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=over 4 |
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=item * |
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L<Reflex|Reflex> |
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=item * |
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L<Moose::Manual::Concepts> |
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=item * |
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L<Reflex> |
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=item * |
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308
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L<Reflex::POE::Event> |
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=item * |
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312
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L<Reflex::POE::Postback> |
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314
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=item * |
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316
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L<Reflex::POE::Session> |
317
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318
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=item * |
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320
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L<Reflex::POE::Wheel::Run> |
321
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322
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=item * |
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324
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L<Reflex/ACKNOWLEDGEMENTS> |
325
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326
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=item * |
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328
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L<Reflex/ASSISTANCE> |
329
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330
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=item * |
331
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332
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L<Reflex/AUTHORS> |
333
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334
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=item * |
335
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336
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L<Reflex/BUGS> |
337
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338
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=item * |
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340
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L<Reflex/BUGS> |
341
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342
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=item * |
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344
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L<Reflex/CONTRIBUTORS> |
345
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346
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=item * |
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348
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L<Reflex/COPYRIGHT> |
349
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350
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=item * |
351
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352
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|
L<Reflex/LICENSE> |
353
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354
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=item * |
355
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356
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L<Reflex/TODO> |
357
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358
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|
=back |
359
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360
|
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|
=head1 BUGS AND LIMITATIONS |
361
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|
362
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|
|
You can make new bug reports, and view existing ones, through the |
363
|
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|
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|
|
web interface at L<http://rt.cpan.org/Public/Dist/Display.html?Name=Reflex>. |
364
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365
|
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=head1 AUTHOR |
366
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|
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|
367
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|
|
Rocco Caputo <rcaputo@cpan.org> |
368
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369
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=head1 COPYRIGHT AND LICENSE |
370
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|
371
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|
|
This software is copyright (c) 2017 by Rocco Caputo. |
372
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373
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|
This is free software; you can redistribute it and/or modify it under |
374
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|
|
the same terms as the Perl 5 programming language system itself. |
375
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376
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=head1 AVAILABILITY |
377
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|
378
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|
|
The latest version of this module is available from the Comprehensive Perl |
379
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|
|
Archive Network (CPAN). Visit L<http://www.perl.com/CPAN/> to find a CPAN |
380
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|
|
site near you, or see L<https://metacpan.org/module/Reflex/>. |
381
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382
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|
=head1 DISCLAIMER OF WARRANTY |
383
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|
384
|
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|
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|
|
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY |
385
|
|
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|
|
|
|
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT |
386
|
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|
|
|
|
WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER |
387
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|
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|
|
|
PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, |
388
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|
|
|
|
EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE |
389
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|
|
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
390
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|
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|
|
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE |
391
|
|
|
|
|
|
|
SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME |
392
|
|
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|
|
|
|
THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION. |
393
|
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|
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394
|
|
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|
|
|
|
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
395
|
|
|
|
|
|
|
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR |
396
|
|
|
|
|
|
|
REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE |
397
|
|
|
|
|
|
|
TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR |
398
|
|
|
|
|
|
|
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE |
399
|
|
|
|
|
|
|
SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING |
400
|
|
|
|
|
|
|
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A |
401
|
|
|
|
|
|
|
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF |
402
|
|
|
|
|
|
|
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
403
|
|
|
|
|
|
|
DAMAGES. |
404
|
|
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|
405
|
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|
|
=cut |