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package Reflex::Callback::Promise; |
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# vim: ts=2 sw=2 noexpandtab |
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$Reflex::Callback::Promise::VERSION = '0.100'; |
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use Moose; |
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extends qw(Reflex::Callbacks Reflex::Callback); |
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use Carp qw(confess); |
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has queue => ( |
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is => 'rw', |
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isa => 'ArrayRef[ArrayRef]', |
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default => sub { [] }, |
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); |
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# TODO - 100 is hardcoded, but some people may want more or fewer. |
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# Delivering to a promise enqueues the message. |
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sub deliver { |
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my ($self, $event) = @_; |
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confess "promise queue overflow in $self" if ( |
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push(@{$self->queue()}, $event) > 100 |
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); |
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} |
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sub next { |
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my $self = shift; |
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my $queue = $self->queue(); |
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# Run while the queue is empty and POE has things to do. |
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1 while ( |
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@$queue < 1 and $POE::Kernel::poe_kernel->run_one_timeslice() |
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); |
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return shift @$queue; |
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} |
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sub merge_into { |
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my ($self, $other_promise) = @_; |
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# Retain old queue for the moment. |
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my $old_queue = $self->queue(); |
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# Redirect this promise into the other promise's queue. |
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0
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$self->queue( $other_promise->queue() ); |
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# If this promise contains events, move then into the other queue. |
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# TODO - Order is not maintained. |
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push @{$other_promise->queue()}, @$old_queue; |
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49
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50
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0
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undef; |
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} |
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53
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__PACKAGE__->meta->make_immutable; |
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55
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1; |
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57
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__END__ |
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59
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=pod |
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=encoding UTF-8 |
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=for :stopwords Rocco Caputo |
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65
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=head1 NAME |
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67
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Reflex::Callback::Promise - Non-callback, inline Promise adapter |
68
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69
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=head1 VERSION |
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71
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This document describes version 0.100, released on April 02, 2017. |
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73
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=head1 SYNOPSIS |
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75
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Used within Reflex: |
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77
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use Reflex::Interval; |
78
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use ExampleHelpers qw(eg_say); |
79
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80
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my $pt = Reflex::Interval->new( |
81
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interval => 1 + rand(), |
82
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auto_repeat => 1, |
83
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); |
84
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85
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while (my $event = $pt->next()) { |
86
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eg_say("promise timer returned an event (@$event)"); |
87
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} |
88
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89
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Low-level usage: |
90
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91
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use Reflex::Callback::Promise; |
92
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93
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my $cb = Reflex::Callback::Promise->new(); |
94
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$cb->deliver( greet => { name => "world" } ); |
95
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96
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my $event = $cb->next(); |
97
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print "event '$event->{name}': hello, $event->{arg}{name}\n"; |
98
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99
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=head1 DESCRIPTION |
100
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101
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"In computer science, future, promise, and delay refer to constructs |
102
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used for synchronization in some concurrent programming languages. |
103
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They describe an object that acts as a proxy for a result that is |
104
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initially not known, usually because the computation of its value has |
105
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not yet completed." -- |
106
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http://en.wikipedia.org/wiki/Promise_%28programming%29 |
107
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108
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Reflex::Callback::Promise enables Reflex objects to be used as inline |
109
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event streams. Reflex::Callback::Promise and Reflex::Role::Reactive |
110
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transparently handle the conversion. Reflex objects do not need |
111
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special code to be used this way. |
112
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113
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In most cases, Reflex::Callbacks::cb_promise() or other syntactic |
114
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sweeteners will be used instead of raw Reflex::Callback::Promise |
115
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objects. For example, promises are implicitly enabled if no callbacks |
116
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are defined: |
117
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118
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my $t = Reflex::Interval->new( |
119
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interval => 1, |
120
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auto_repeat => 1, |
121
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); |
122
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123
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while (my $event = $t->next()) { |
124
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print "next() returned an event\n"; |
125
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} |
126
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127
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=head2 new |
128
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129
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Reflex::Callback::Promise's constructor takes no parameters. It |
130
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creates a promise queue that is populated by deliver() and drained by |
131
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next(). Furthermore, next() will block as necessary until it can |
132
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return an event. This requires the help of some form of concurrency, |
133
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currently hardcoded to use POE. |
134
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135
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A future version may delegate the POE dependency to a subclass. |
136
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137
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=head2 next |
138
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139
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Reflex::Callback::Promise's next() method retrieves the next pending |
140
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event held in the object's queue. If the queue is empty, next() will |
141
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dispatch other events until some asynchronous code enqueues a new event |
142
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in the promise's queue. |
143
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144
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=head2 deliver |
145
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146
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Reflex::Callback::Promise's deliver() enqueues events for the promise. |
147
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As with other Reflex::Callback subclasses, this deliver() accepts two |
148
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positional parameters: an event name (which IS used), and a hashref of |
149
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named parameters to be passed to the callback. |
150
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151
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Deliver doesn't return anything meaningful, since the code to handle |
152
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the event isn't executed at the time of delivery. |
153
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154
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=for Pod::Coverage merge_into |
155
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156
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=head1 SEE ALSO |
157
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158
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Please see those modules/websites for more information related to this module. |
159
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160
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=over 4 |
161
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162
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=item * |
163
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164
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L<Reflex|Reflex> |
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166
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=item * |
167
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168
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L<Reflex> |
169
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170
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=item * |
171
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172
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L<Reflex::Callback> |
173
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174
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=item * |
175
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176
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L<Reflex::Callbacks> |
177
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178
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=item * |
179
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180
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L<Reflex/ACKNOWLEDGEMENTS> |
181
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182
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=item * |
183
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184
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L<Reflex/ASSISTANCE> |
185
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186
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=item * |
187
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188
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L<Reflex/AUTHORS> |
189
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190
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=item * |
191
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192
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L<Reflex/BUGS> |
193
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194
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=item * |
195
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196
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L<Reflex/BUGS> |
197
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198
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=item * |
199
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200
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L<Reflex/CONTRIBUTORS> |
201
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202
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=item * |
203
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204
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L<Reflex/COPYRIGHT> |
205
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206
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=item * |
207
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208
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L<Reflex/LICENSE> |
209
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210
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=item * |
211
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212
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L<Reflex/TODO> |
213
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214
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=back |
215
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216
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=head1 BUGS AND LIMITATIONS |
217
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218
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You can make new bug reports, and view existing ones, through the |
219
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web interface at L<http://rt.cpan.org/Public/Dist/Display.html?Name=Reflex>. |
220
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221
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=head1 AUTHOR |
222
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223
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Rocco Caputo <rcaputo@cpan.org> |
224
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225
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=head1 COPYRIGHT AND LICENSE |
226
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227
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This software is copyright (c) 2017 by Rocco Caputo. |
228
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229
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This is free software; you can redistribute it and/or modify it under |
230
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the same terms as the Perl 5 programming language system itself. |
231
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232
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=head1 AVAILABILITY |
233
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234
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The latest version of this module is available from the Comprehensive Perl |
235
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Archive Network (CPAN). Visit L<http://www.perl.com/CPAN/> to find a CPAN |
236
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site near you, or see L<https://metacpan.org/module/Reflex/>. |
237
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238
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=head1 DISCLAIMER OF WARRANTY |
239
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240
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BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY |
241
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FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT |
242
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WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER |
243
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PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, |
244
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EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE |
245
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
246
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PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE |
247
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SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME |
248
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THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION. |
249
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250
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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
251
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WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR |
252
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REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE |
253
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TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR |
254
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CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE |
255
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SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING |
256
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RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A |
257
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FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF |
258
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SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
259
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DAMAGES. |
260
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261
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=cut |