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package POE::Declare::Log::File; |
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=pod |
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=head1 NAME |
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POE::Declare::Log::File - A simple HTTP client based on POE::Declare |
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=head1 SYNOPSIS |
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# Create the web server |
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my $http = POE::Declare::Log::File->new( |
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Filename => '/var/log/my.log', |
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Lazy => 1, |
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); |
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# Control with methods |
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$http->start; |
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$http->GET('http://google.com'); |
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$http->stop; |
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=head1 DESCRIPTION |
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This module provides a simple logging module which spools output to a file, |
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queueing and batching messages in memory if the message rate exceeds the |
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responsiveness of the filesystem. |
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The implementation is intentionally minimalist and has no dependencies beyond |
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those of L itself, which makes this module useful for simple |
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utility logging or debugging systems. |
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=head1 METHODS |
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=cut |
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use 5.008; |
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use strict; |
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use Carp (); |
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use Symbol (); |
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use File::Spec 0.80 (); |
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use POE 1.293 (); |
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143603
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1877
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use POE::Driver::SysRW (); |
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use POE::Filter::Stream (); |
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3150
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2078
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use POE::Wheel::ReadWrite (); |
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251234
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148
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46
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our $VERSION = '0.01'; |
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48
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use POE::Declare 0.54 { |
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0
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Filename => 'Param', |
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Handle => 'Param', |
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Lazy => 'Param', |
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ErrorEvent => 'Message', |
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ShutdownEvent => 'Message', |
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wheel => 'Internal', |
55
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queue => 'Internal', |
56
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state => 'Internal', |
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2
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2414
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}; |
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58
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59
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60
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61
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###################################################################### |
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# Constructor and Accessors |
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66
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=pod |
67
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68
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=head2 new |
69
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70
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my $server = POE::Declare::Log::File->new( |
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Filename => |
72
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ShutdownEvent => \&on_shutdown, |
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); |
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75
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The C constructor sets up a reusable HTTP client that can be enabled |
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and disabled repeatedly as needed. |
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78
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=cut |
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80
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sub new { |
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my $class = shift; |
82
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my $self = $class->SUPER::new(@_); |
83
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84
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# Set the starting state |
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$self->{state} = 'STOP'; |
86
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87
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# Open the file if needed |
88
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if ( $self->Lazy ) { |
89
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if ( $self->Handle ) { |
90
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Carp::croak("Cannot load Lazy when Handle is provided"); |
91
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} elsif ( $self->Filename ) { |
92
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### TODO: Check if the filename is future-writable |
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} else { |
94
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Carp::croak("Did not provide a Filename or Handle"); |
95
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} |
96
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97
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} else { |
98
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if ( $self->Filename and $self->Handle ) { |
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Carp::croak("Filename and Handle are mutually exclusive"); |
100
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} elsif ( $self->Filename ) { |
101
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# Try to open the file immediately |
102
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$self->{Handle} = $self->_handle; |
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} |
104
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unless ( $self->Handle ) { |
105
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Carp::croak("Did not provide a Filename or Handle") |
106
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} |
107
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} |
108
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109
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return $self; |
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} |
111
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112
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113
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114
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115
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116
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###################################################################### |
117
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# Control Methods |
118
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119
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=pod |
120
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121
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=head2 start |
122
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123
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The C method enables the web server. If the server is already running, |
124
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this method will shortcut and do nothing. |
125
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126
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If called before L has been started, the web server will start |
127
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immediately once L is running. |
128
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129
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=cut |
130
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131
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sub start { |
132
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my $self = shift; |
133
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unless ( $self->spawned ) { |
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$self->spawn; |
135
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$self->post('startup'); |
136
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} |
137
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138
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# Allow calling print immediately after start before the POE |
139
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# startup has completed |
140
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unless ( exists $self->{buffer} ) { |
141
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$self->{buffer} = undef; |
142
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} |
143
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144
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return 1; |
145
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} |
146
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147
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=pod |
148
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149
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=head2 stop |
150
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151
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The C method disables the web server. If the server is not running, |
152
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this method will shortcut and do nothing. |
153
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154
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=cut |
155
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156
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sub stop { |
157
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my $self = shift; |
158
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if ( $self->spawned ) { |
159
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$self->post('shutdown'); |
160
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} |
161
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return 1; |
162
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} |
163
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164
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=pod |
165
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166
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=head2 print |
167
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168
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$log->print("This is a log message"); |
169
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170
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Writes one or more messages to the log. |
171
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172
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Returns true if the message will be flushed to the file immediately, false if |
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the message will be queued for later dispatch, or C if the logger is |
174
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disabled and the message will be dropped. |
175
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176
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=cut |
177
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178
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sub print { |
179
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my $self = shift; |
180
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181
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# Has something gone wrong and we shouldn't queue? |
182
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return unless @_; |
183
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return unless exists $self->{buffer}; |
184
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185
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# Add any messages to the queue of pending output |
186
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unless ( defined $self->{buffer} ) { |
187
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$self->{buffer} = shift() . "\n"; |
188
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} |
189
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while ( @_ ) { |
190
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$self->{buffer} .= shift() . "\n"; |
191
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} |
192
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193
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# Do a lazy connection to the file if needed. |
194
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# The startup will do the equivalent of the below for us. |
195
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if ( $self->{state} eq 'LAZY' ) { |
196
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$self->call('startup'); |
197
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return 1; |
198
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} |
199
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200
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# Initiate a flush event if we aren't doing one already |
201
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if ( $self->{state} eq 'IDLE' ) { |
202
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$self->{state} = 'BUSY'; |
203
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$self->post('flush'); |
204
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return 1; |
205
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} |
206
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207
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# Message is delayed |
208
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return 0; |
209
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} |
210
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211
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212
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213
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214
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215
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###################################################################### |
216
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# Event Methods |
217
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218
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sub startup : Event { |
219
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if ( $_[SELF]->Lazy ) { |
220
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if ( defined $_[SELF]->{buffer} ) { |
221
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# Open the file immediately |
222
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$_[SELF]->{Handle} = $_[SELF]->_handle; |
223
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} else { |
224
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# Switch to lazy start mode |
225
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$_[SELF]->{state} = 'LAZY'; |
226
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return; |
227
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} |
228
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} |
229
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230
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# Connect to the handle |
231
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$_[SELF]->post('connect'); |
232
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} |
233
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234
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sub connect : Event { |
235
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# Create the read/write wheel on the filehandle |
236
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$_[SELF]->{wheel} = POE::Wheel::ReadWrite->new( |
237
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Handle => $_[SELF]->Handle, |
238
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Filter => POE::Filter::Stream->new, |
239
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AutoFlush => 1, |
240
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FlushedEvent => 'flush', |
241
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ErrorEvent => 'error', |
242
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); |
243
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|
$_[SELF]->{state} = 'IDLE'; |
244
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245
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|
# Do an initial queue flush if we have anything |
246
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|
if ( defined $_[SELF]->{buffer} ) { |
247
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|
$_[SELF]->{state} = 'BUSY'; |
248
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|
$_[SELF]->post('flush'); |
249
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|
} |
250
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251
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|
return; |
252
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} |
253
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254
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sub flush : Event { |
255
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|
if ( defined $_[SELF]->{buffer} ) { |
256
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# Almost all the time we should arrive here already |
257
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# busy. But if we do arrive IDLE accidentally, set as well. |
258
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|
|
if ( $_[SELF]->{state} eq 'IDLE' ) { |
259
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|
$_[SELF]->{state} = 'BUSY'; |
260
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|
} |
261
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262
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|
|
# Merge the queued messages ourself to prevent having to use a heavier |
263
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|
|
|
|
# POE line filter in the Read/Write wheel. |
264
|
|
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|
|
|
|
$_[SELF]->{wheel}->put( delete $_[SELF]->{buffer} ); |
265
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|
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|
$_[SELF]->{buffer} = undef; |
266
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267
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|
|
} else { |
268
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|
|
|
# Nothing (left) to do |
269
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|
|
|
|
if ( $_[SELF]->{state} eq 'HALT' ) { |
270
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|
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|
|
|
|
$_[SELF]->{state} = 'STOP'; |
271
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|
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|
|
$_[SELF]->finish; |
272
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|
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|
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|
|
$_[SELF]->ShutdownEvent; |
273
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|
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|
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274
|
|
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|
|
} else { |
275
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|
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|
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|
|
$_[SELF]->{state} = 'IDLE'; |
276
|
|
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|
|
|
|
} |
277
|
|
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|
|
|
} |
278
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|
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|
|
279
|
|
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|
|
|
|
return; |
280
|
|
|
|
|
|
|
} |
281
|
|
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|
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|
|
282
|
|
|
|
|
|
|
sub error : Event { |
283
|
|
|
|
|
|
|
$_[SELF]->{state} = 'CRASH'; |
284
|
|
|
|
|
|
|
|
285
|
|
|
|
|
|
|
# Prevent additional message and flush queue |
286
|
|
|
|
|
|
|
delete $_[SELF]->{buffer}; |
287
|
|
|
|
|
|
|
|
288
|
|
|
|
|
|
|
# Clean up streaming resources |
289
|
|
|
|
|
|
|
$_[SELF]->clean; |
290
|
|
|
|
|
|
|
|
291
|
|
|
|
|
|
|
return; |
292
|
|
|
|
|
|
|
} |
293
|
|
|
|
|
|
|
|
294
|
|
|
|
|
|
|
sub shutdown : Event { |
295
|
|
|
|
|
|
|
my $state = $_[SELF]->{state}; |
296
|
|
|
|
|
|
|
|
297
|
|
|
|
|
|
|
# Superfluous crash shutdown |
298
|
|
|
|
|
|
|
if ( $state eq 'CRASH' ) { |
299
|
|
|
|
|
|
|
$_[SELF]->finish; |
300
|
|
|
|
|
|
|
$_[SELF]->ShutdownEvent; |
301
|
|
|
|
|
|
|
return; |
302
|
|
|
|
|
|
|
} |
303
|
|
|
|
|
|
|
|
304
|
|
|
|
|
|
|
# Shutdown with nothing pending to write |
305
|
|
|
|
|
|
|
if ( $state eq 'IDLE' or $state eq 'LAZY') { |
306
|
|
|
|
|
|
|
$_[SELF]->{state} = 'STOP'; |
307
|
|
|
|
|
|
|
$_[SELF]->finish; |
308
|
|
|
|
|
|
|
$_[SELF]->ShutdownEvent; |
309
|
|
|
|
|
|
|
return; |
310
|
|
|
|
|
|
|
} |
311
|
|
|
|
|
|
|
|
312
|
|
|
|
|
|
|
# Shutdown while writing |
313
|
|
|
|
|
|
|
if ( $state eq 'BUSY' ) { |
314
|
|
|
|
|
|
|
# Signal we want to stop as soon as the queue is empty, |
315
|
|
|
|
|
|
|
# but otherwise just wait for the natural end. |
316
|
|
|
|
|
|
|
$_[SELF]->{state} = 'HALT'; |
317
|
|
|
|
|
|
|
return; |
318
|
|
|
|
|
|
|
} |
319
|
|
|
|
|
|
|
|
320
|
|
|
|
|
|
|
# Must be a shutdown while HALT, just keep waiting |
321
|
|
|
|
|
|
|
return; |
322
|
|
|
|
|
|
|
} |
323
|
|
|
|
|
|
|
|
324
|
|
|
|
|
|
|
|
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
###################################################################### |
329
|
|
|
|
|
|
|
# POE::Declare::Object Methods |
330
|
|
|
|
|
|
|
|
331
|
|
|
|
|
|
|
sub finish { |
332
|
|
|
|
|
|
|
my $self = shift; |
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
# Prevent additional messages and flush the queue |
335
|
|
|
|
|
|
|
delete $self->{buffer}; |
336
|
|
|
|
|
|
|
|
337
|
|
|
|
|
|
|
# Clean up streaming resources |
338
|
|
|
|
|
|
|
$self->clean; |
339
|
|
|
|
|
|
|
|
340
|
|
|
|
|
|
|
# Pass through as normal |
341
|
|
|
|
|
|
|
$self->SUPER::finish(@_); |
342
|
|
|
|
|
|
|
} |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
sub clean { |
345
|
|
|
|
|
|
|
my $self = shift; |
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
# Shutdown the wheel |
348
|
|
|
|
|
|
|
if ( $self->{wheel} ) { |
349
|
|
|
|
|
|
|
$self->{wheel}->shutdown_output; |
350
|
|
|
|
|
|
|
delete $self->{wheel}; |
351
|
|
|
|
|
|
|
} |
352
|
|
|
|
|
|
|
|
353
|
|
|
|
|
|
|
# If we opened a file, close it |
354
|
|
|
|
|
|
|
if ( $self->Filename and $self->{Handle} ) { |
355
|
|
|
|
|
|
|
close delete $self->{Handle}; |
356
|
|
|
|
|
|
|
} |
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
return; |
359
|
|
|
|
|
|
|
} |
360
|
|
|
|
|
|
|
|
361
|
|
|
|
|
|
|
|
362
|
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
###################################################################### |
366
|
|
|
|
|
|
|
# Support Methods |
367
|
|
|
|
|
|
|
|
368
|
|
|
|
|
|
|
sub _handle { |
369
|
|
|
|
|
|
|
my $self = shift; |
370
|
|
|
|
|
|
|
my $filename = $self->Filename; |
371
|
|
|
|
|
|
|
my $handle = Symbol::gensym(); |
372
|
|
|
|
|
|
|
if ( open( $handle, '>>', $filename ) ) { |
373
|
|
|
|
|
|
|
$handle->autoflush(1); |
374
|
|
|
|
|
|
|
return $handle; |
375
|
|
|
|
|
|
|
} |
376
|
|
|
|
|
|
|
Carp::croak("Failed to open $filename"); |
377
|
|
|
|
|
|
|
} |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
compile; |
380
|
|
|
|
|
|
|
|
381
|
|
|
|
|
|
|
=pod |
382
|
|
|
|
|
|
|
|
383
|
|
|
|
|
|
|
=head1 SUPPORT |
384
|
|
|
|
|
|
|
|
385
|
|
|
|
|
|
|
Bugs should be always be reported via the CPAN bug tracker at |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
L |
388
|
|
|
|
|
|
|
|
389
|
|
|
|
|
|
|
For other issues, or commercial enhancement or support, contact the author. |
390
|
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
=head1 AUTHORS |
392
|
|
|
|
|
|
|
|
393
|
|
|
|
|
|
|
Adam Kennedy Eadamk@cpan.orgE |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
=head1 SEE ALSO |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
L, L, L |
398
|
|
|
|
|
|
|
|
399
|
|
|
|
|
|
|
=head1 COPYRIGHT |
400
|
|
|
|
|
|
|
|
401
|
|
|
|
|
|
|
Copyright 2011 Adam Kennedy. |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
This program is free software; you can redistribute |
404
|
|
|
|
|
|
|
it and/or modify it under the same terms as Perl itself. |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
The full text of the license can be found in the |
407
|
|
|
|
|
|
|
LICENSE file included with this module. |
408
|
|
|
|
|
|
|
|
409
|
|
|
|
|
|
|
=cut |