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stmt |
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pod |
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code |
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package POE::Component::Schedule; |
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3162091
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use 5.008; |
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74
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13
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992
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4
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5
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88
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use strict; |
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26
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13
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690
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6
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13
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82
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use warnings; |
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33
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13
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464
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7
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80
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use Carp; |
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1746
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our $VERSION = '0.95'; |
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280649
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use POE; |
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814231
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146
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BEGIN { |
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745479
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defined &DEBUG or *DEBUG = sub () { 0 }; |
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} |
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# Private properties of a schedule ticket |
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sub PCS_TIMER () { 0 } # The POE timer |
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sub PCS_ITERATOR () { 1 } # DateTime::Set iterator |
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sub PCS_SESSION () { 2 } # POE session ID |
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sub PCS_EVENT () { 3 } # Event name |
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sub PCS_ARGS () { 4 } # Event args array |
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# Private constant: |
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# The name of the counter attached to each session |
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# We use only one counter for all timers of one session |
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# All instances of P::C::S will use the same counter for a given session |
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sub REFCOUNT_COUNTER_NAME () { __PACKAGE__ } |
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# Scheduling session ID |
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# This session is a singleton |
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my $BackEndSession; |
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35
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# Maps tickets IDs to tickets |
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my %Tickets = (); |
37
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my $LastTicketID = 'a'; # 'b' ... 'z', 'aa' ... |
38
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39
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# |
40
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# crank up the schedule session |
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# |
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sub spawn { ## no critic (Subroutines::RequireArgUnpacking) |
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3
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50
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3
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1
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2834
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if ( !defined $BackEndSession ) { |
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3
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9
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my ($class, %arg) = @_; |
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3
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66
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23
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my $alias = $arg{Alias} || ref $class || $class; |
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47
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$BackEndSession = POE::Session->create( |
48
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inline_states => { |
49
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_start => sub { |
50
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3
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3
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13544
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print "# $alias _start\n" if DEBUG; |
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3
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858
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my ($k) = $_[KERNEL]; |
52
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53
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3
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17
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$k->detach_myself; |
54
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3
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82
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$k->alias_set( $alias ); |
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3
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129
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$k->sig( 'SHUTDOWN', 'shutdown' ); |
56
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}, |
57
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58
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schedule => \&_schedule, |
59
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client_event => \&_client_event, |
60
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cancel => \&_cancel, |
61
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62
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shutdown => sub { |
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0
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0
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0
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print "# $alias shutdown\n" if DEBUG; |
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0
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0
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my $k = $_[KERNEL]; |
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66
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# Remove all timers of our session |
67
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# and decrement session references |
68
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0
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0
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foreach my $alarm ($k->alarm_remove_all()) { |
69
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0
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0
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my ($name, $time, $t) = @$alarm; |
70
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0
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0
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$t->[PCS_TIMER] = undef; |
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0
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0
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$k->refcount_decrement($t->[PCS_SESSION], REFCOUNT_COUNTER_NAME); |
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} |
73
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0
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0
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%Tickets = (); |
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75
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0
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0
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$k->sig_handled(); |
76
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}, |
77
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_stop => sub { |
78
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3
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3
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3758
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print "# $alias _stop\n" if DEBUG; |
79
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3
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404
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$BackEndSession = undef; |
80
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}, |
81
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}, |
82
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3
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73
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)->ID; |
83
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} |
84
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3
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552
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return $BackEndSession; |
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} |
86
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87
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# |
88
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# schedule the next event |
89
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# ARG0 is the schedule ticket |
90
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# |
91
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sub _schedule { |
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0
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0
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0
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my ( $k, $t ) = @_[ KERNEL, ARG0]; |
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94
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# |
95
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# deal with DateTime::Sets that are finite |
96
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# |
97
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0
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0
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my $n = $t->[PCS_ITERATOR]->next; |
98
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0
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0
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0
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unless ($n) { |
99
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# No more events, so release the session |
100
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0
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0
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$k->refcount_decrement($t->[PCS_SESSION], REFCOUNT_COUNTER_NAME); |
101
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0
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0
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$t->[PCS_TIMER] = undef; |
102
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0
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0
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return; |
103
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} |
104
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105
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0
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0
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$t->[PCS_TIMER] = $k->alarm_set( client_event => $n->epoch, $t ); |
106
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0
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0
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return $t; |
107
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} |
108
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109
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# |
110
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# handle a client event and schedule the next one |
111
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# ARG0 is the schedule ticket |
112
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# |
113
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sub _client_event { ## no critic (Subroutines::RequireArgUnpacking) |
114
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0
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0
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0
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my ( $k, $t ) = @_[ KERNEL, ARG0 ]; |
115
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116
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0
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0
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$k->post( @{$t}[PCS_SESSION, PCS_EVENT], @{$t->[PCS_ARGS]} ); |
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0
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0
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0
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0
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117
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118
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0
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0
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return _schedule(@_); |
119
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} |
120
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121
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# |
122
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# cancel an alarm |
123
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# |
124
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sub _cancel { |
125
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0
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0
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0
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my ( $k, $t ) = @_[ KERNEL, ARG0 ]; |
126
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127
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0
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50
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0
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if (defined($t->[PCS_TIMER])) { |
128
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0
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0
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$k->alarm_remove($t->[PCS_TIMER]); |
129
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0
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0
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$k->refcount_decrement($t->[PCS_SESSION], REFCOUNT_COUNTER_NAME); |
130
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0
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0
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$t->[PCS_TIMER] = undef; |
131
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} |
132
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0
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0
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return; |
133
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} |
134
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135
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# |
136
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# Takes a POE::Session, an event name and a DateTime::Set |
137
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# Returns a ticket object |
138
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# |
139
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sub add { |
140
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141
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3
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3
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1
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2005
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my ( $class, $session, $event, $iterator, @args ) = @_; |
142
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143
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# Remember only the session ID |
144
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3
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100
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19
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$session = $poe_kernel->alias_resolve($session) unless ref $session; |
145
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3
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100
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254
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defined($session) or croak __PACKAGE__ . "->add: first arg must be an existing POE session ID or alias."; |
146
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2
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9
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$session = $session->ID; |
147
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148
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# We don't want to loose the session until the event has been handled |
149
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2
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50
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15
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$poe_kernel->refcount_increment($session, REFCOUNT_COUNTER_NAME) > 0 |
150
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or croak __PACKAGE__ . "->add: first arg must be an existing POE session ID or alias: $!"; |
151
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152
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2
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50
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33
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273
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ref $iterator && $iterator->isa('DateTime::Set') |
153
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or croak __PACKAGE__ . "->add: third arg must be a DateTime::Set"; |
154
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155
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0
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0
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$class->spawn unless $BackEndSession; |
156
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157
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0
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my $id = $LastTicketID++; |
158
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0
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my $ticket = $Tickets{$id} = [ |
159
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undef, # Current alarm id |
160
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$iterator, |
161
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$session, |
162
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$event, |
163
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\@args, |
164
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]; |
165
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166
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0
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$poe_kernel->post( $BackEndSession, schedule => $ticket); |
167
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168
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# We return a kind of smart pointer, so the schedule |
169
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# can be simply destroyed by releasing its object reference |
170
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0
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0
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return bless \$id, ref($class) || $class; |
171
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} |
172
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173
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sub delete { |
174
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0
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0
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1
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my $id = ${$_[0]}; |
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0
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175
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0
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0
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return unless exists $Tickets{$id}; |
176
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0
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$poe_kernel->post($BackEndSession, cancel => delete $Tickets{$id}); |
177
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0
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return; |
178
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} |
179
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180
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# Releasing the ticket object will delete the ressource |
181
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sub DESTROY { |
182
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0
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0
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return $_[0]->delete; |
183
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} |
184
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185
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{ |
186
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13
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13
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117
|
no warnings; |
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13
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29
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13
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1652
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187
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*new = \&add; |
188
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} |
189
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190
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1; |
191
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__END__ |