Commit | Line | Data |
74e31b02 |
1 | package Catalyst::Plugin::Scheduler; |
2 | |
3 | use strict; |
4 | use warnings; |
f9d8e3cf |
5 | use base qw/Class::Accessor::Fast Class::Data::Inheritable/; |
cbf1ecfe |
6 | use DateTime; |
7 | use DateTime::Event::Cron; |
8 | use DateTime::TimeZone; |
68f800bd |
9 | use File::stat; |
74e31b02 |
10 | use NEXT; |
f9d8e3cf |
11 | use Set::Object; |
12 | use Storable qw/lock_store lock_retrieve/; |
13 | use YAML; |
74e31b02 |
14 | |
15 | our $VERSION = '0.01'; |
16 | |
cbf1ecfe |
17 | __PACKAGE__->mk_classdata( '_events' => [] ); |
68f800bd |
18 | __PACKAGE__->mk_accessors('_event_state'); |
cbf1ecfe |
19 | |
20 | sub schedule { |
21 | my ( $class, %args ) = @_; |
68f800bd |
22 | |
f9d8e3cf |
23 | unless ( $args{event} ) { |
68f800bd |
24 | Catalyst::Exception->throw( |
25 | message => 'The schedule method requires an event parameter' ); |
f9d8e3cf |
26 | } |
68f800bd |
27 | |
f9d8e3cf |
28 | my $conf = $class->config->{scheduler}; |
68f800bd |
29 | |
cbf1ecfe |
30 | my $event = { |
cbf1ecfe |
31 | trigger => $args{trigger}, |
f9d8e3cf |
32 | event => $args{event}, |
cbf1ecfe |
33 | auto_run => ( defined $args{auto_run} ) ? $args{auto_run} : 1, |
34 | }; |
68f800bd |
35 | |
cbf1ecfe |
36 | if ( $args{at} ) { |
68f800bd |
37 | |
cbf1ecfe |
38 | # replace keywords that Set::Crontab doesn't support |
39 | $args{at} = _prepare_cron( $args{at} ); |
68f800bd |
40 | |
cbf1ecfe |
41 | # parse the cron entry into a DateTime::Set |
42 | my $set; |
43 | eval { $set = DateTime::Event::Cron->from_cron( $args{at} ) }; |
68f800bd |
44 | if ($@) { |
45 | Catalyst::Exception->throw( |
46 | "Scheduler: Unable to parse 'at' value " |
47 | . $args{at} . ': ' |
48 | . $@ ); |
cbf1ecfe |
49 | } |
50 | else { |
51 | $event->{set} = $set; |
52 | } |
53 | } |
68f800bd |
54 | |
cbf1ecfe |
55 | push @{ $class->_events }, $event; |
56 | } |
57 | |
58 | sub dispatch { |
59 | my $c = shift; |
68f800bd |
60 | |
cbf1ecfe |
61 | $c->NEXT::dispatch(@_); |
68f800bd |
62 | |
f9d8e3cf |
63 | $c->_get_event_state(); |
68f800bd |
64 | |
65 | $c->_check_yaml(); |
66 | |
cbf1ecfe |
67 | # check if a minute has passed since our last check |
f9d8e3cf |
68 | # This check is not run if the user is manually triggering an event |
69 | if ( time - $c->_event_state->{last_check} < 60 ) { |
70 | return unless $c->req->params->{schedule_trigger}; |
cbf1ecfe |
71 | } |
f9d8e3cf |
72 | my $last_check = $c->_event_state->{last_check}; |
73 | $c->_event_state->{last_check} = time; |
74 | $c->_save_event_state(); |
68f800bd |
75 | |
76 | my $conf = $c->config->{scheduler}; |
f9d8e3cf |
77 | my $last_check_dt = DateTime->from_epoch( |
78 | epoch => $last_check, |
cbf1ecfe |
79 | time_zone => $conf->{time_zone} |
80 | ); |
81 | my $now = DateTime->now( time_zone => $conf->{time_zone} ); |
68f800bd |
82 | |
48390e8e |
83 | EVENT: |
cbf1ecfe |
84 | for my $event ( @{ $c->_events } ) { |
f9d8e3cf |
85 | my $next_run; |
68f800bd |
86 | |
87 | if ( $event->{trigger} |
88 | && $event->{trigger} eq $c->req->params->{schedule_trigger} ) |
89 | { |
90 | |
f9d8e3cf |
91 | # manual trigger, run it now |
92 | next EVENT unless $c->_event_authorized; |
93 | $next_run = $now; |
94 | } |
95 | else { |
96 | next EVENT unless $event->{set}; |
68f800bd |
97 | $next_run = $event->{set}->next($last_check_dt); |
f9d8e3cf |
98 | } |
68f800bd |
99 | |
cbf1ecfe |
100 | if ( $next_run <= $now ) { |
68f800bd |
101 | |
cbf1ecfe |
102 | # do some security checking for non-auto-run events |
103 | if ( !$event->{auto_run} ) { |
104 | next EVENT unless $c->_event_authorized; |
105 | } |
68f800bd |
106 | |
f9d8e3cf |
107 | # make sure we're the only process running this event |
68f800bd |
108 | next EVENT unless $c->_mark_running($event); |
109 | |
cbf1ecfe |
110 | my $event_name = $event->{trigger} || $event->{event}; |
68f800bd |
111 | $c->log->debug("Scheduler: Executing $event_name") |
f9d8e3cf |
112 | if $c->config->{scheduler}->{logging}; |
68f800bd |
113 | |
cbf1ecfe |
114 | # trap errors |
115 | local $c->{error} = []; |
68f800bd |
116 | |
cbf1ecfe |
117 | # run event |
118 | eval { |
68f800bd |
119 | |
cbf1ecfe |
120 | # do not allow the event to modify the response |
121 | local $c->res->{body}; |
122 | local $c->res->{cookies}; |
123 | local $c->res->{headers}; |
124 | local $c->res->{location}; |
125 | local $c->res->{status}; |
68f800bd |
126 | |
cbf1ecfe |
127 | if ( ref $event->{event} eq 'CODE' ) { |
68f800bd |
128 | $event->{event}->($c); |
cbf1ecfe |
129 | } |
130 | else { |
131 | $c->forward( $event->{event} ); |
132 | } |
133 | }; |
134 | my @errors = @{ $c->{error} }; |
135 | push @errors, $@ if $@; |
68f800bd |
136 | if (@errors) { |
137 | $c->log->error( |
138 | 'Scheduler: Error executing ' . "$event_name: $_" ) |
139 | for @errors; |
cbf1ecfe |
140 | } |
68f800bd |
141 | |
142 | $c->_mark_finished($event); |
cbf1ecfe |
143 | } |
144 | } |
145 | } |
146 | |
147 | sub setup { |
148 | my $c = shift; |
68f800bd |
149 | |
cbf1ecfe |
150 | # initial configuration |
48390e8e |
151 | $c->config->{scheduler}->{logging} ||= ( $c->debug ) ? 1 : 0; |
68f800bd |
152 | $c->config->{scheduler}->{time_zone} ||= $c->_detect_timezone(); |
cbf1ecfe |
153 | $c->config->{scheduler}->{state_file} ||= $c->path_to('scheduler.state'); |
154 | $c->config->{scheduler}->{hosts_allow} ||= '127.0.0.1'; |
68f800bd |
155 | $c->config->{scheduler}->{yaml} ||= $c->path_to('scheduler.yml'); |
156 | |
f9d8e3cf |
157 | $c->NEXT::setup(@_); |
cbf1ecfe |
158 | } |
159 | |
68f800bd |
160 | # check and reload the YAML file with schedule data |
161 | sub _check_yaml { |
162 | my ($c) = @_; |
163 | |
164 | # each process needs to load the YAML file independently |
165 | if ( $c->_event_state->{yaml_mtime}->{$$} ||= 0 ) { |
166 | return if ( time - $c->_event_state->{last_check} < 60 ); |
167 | } |
168 | |
169 | return unless -e $c->config->{scheduler}->{yaml}; |
170 | |
171 | eval { |
172 | my $mtime = ( stat $c->config->{scheduler}->{yaml} )->mtime; |
173 | if ( $mtime > $c->_event_state->{yaml_mtime}->{$$} ) { |
174 | $c->_event_state->{yaml_mtime}->{$$} = $mtime; |
175 | $c->_save_event_state(); |
176 | |
177 | # wipe out all current events and reload from YAML |
178 | $c->_events( [] ); |
179 | |
180 | my $yaml = YAML::LoadFile( $c->config->{scheduler}->{yaml} ); |
181 | |
182 | foreach my $event ( @{$yaml} ) { |
183 | $c->schedule( %{$event} ); |
184 | } |
185 | |
186 | $c->log->info( "Scheduler: PID $$ loaded " |
187 | . scalar @{$yaml} |
188 | . ' events from YAML file' ) |
189 | if $c->config->{scheduler}->{logging}; |
190 | } |
191 | }; |
192 | if ($@) { |
193 | $c->log->error("Error reading YAML file: $@"); |
194 | } |
195 | } |
196 | |
cbf1ecfe |
197 | # Detect the current time zone |
198 | sub _detect_timezone { |
199 | my $c = shift; |
68f800bd |
200 | |
cbf1ecfe |
201 | my $tz; |
202 | eval { $tz = DateTime::TimeZone->new( name => 'local' ) }; |
203 | if ($@) { |
68f800bd |
204 | $c->log->warn( |
205 | 'Scheduler: Unable to autodetect local time zone, using UTC'); |
cbf1ecfe |
206 | return 'UTC'; |
207 | } |
208 | else { |
f9d8e3cf |
209 | $c->log->debug( |
68f800bd |
210 | 'Scheduler: Using autodetected time zone: ' . $tz->name ) |
211 | if $c->config->{scheduler}->{logging}; |
cbf1ecfe |
212 | return $tz->name; |
213 | } |
214 | } |
215 | |
216 | # Check for authorized users on non-auto events |
cbf1ecfe |
217 | sub _event_authorized { |
218 | my $c = shift; |
68f800bd |
219 | |
f9d8e3cf |
220 | # this should never happen, but just in case... |
68f800bd |
221 | return unless $c->req->address; |
222 | |
f9d8e3cf |
223 | my $hosts_allow = $c->config->{scheduler}->{hosts_allow}; |
68f800bd |
224 | $hosts_allow = [$hosts_allow] unless ref($hosts_allow) eq 'ARRAY'; |
225 | |
48390e8e |
226 | my $ip = Set::Object->new( [ $c->req->address ] ); |
227 | my $allowed = Set::Object->new( $hosts_allow ); |
68f800bd |
228 | |
229 | return $ip->subset($allowed); |
f9d8e3cf |
230 | } |
231 | |
232 | # get the state from the state file |
233 | sub _get_event_state { |
234 | my $c = shift; |
68f800bd |
235 | |
f9d8e3cf |
236 | if ( -e $c->config->{scheduler}->{state_file} ) { |
68f800bd |
237 | $c->_event_state( |
238 | lock_retrieve $c->config->{scheduler}->{state_file} ); |
f9d8e3cf |
239 | } |
240 | else { |
68f800bd |
241 | |
f9d8e3cf |
242 | # initialize the state file |
68f800bd |
243 | $c->_event_state( |
244 | { last_check => time, |
245 | yaml_mtime => {}, |
246 | } |
247 | ); |
f9d8e3cf |
248 | $c->_save_event_state(); |
249 | } |
250 | } |
251 | |
252 | # Check the state file to ensure we are the only process running an event |
253 | sub _mark_running { |
254 | my ( $c, $event ) = @_; |
68f800bd |
255 | |
f9d8e3cf |
256 | $c->_get_event_state(); |
68f800bd |
257 | |
f9d8e3cf |
258 | return if $c->_event_state->{ $event->{event} }; |
68f800bd |
259 | |
f9d8e3cf |
260 | # this is a 2-step process to prevent race conditions |
261 | # 1. write the state file with our PID |
262 | $c->_event_state->{ $event->{event} } = $$; |
263 | $c->_save_event_state(); |
68f800bd |
264 | |
f9d8e3cf |
265 | # 2. re-read the state file and make sure it's got the same PID |
266 | $c->_get_event_state(); |
267 | if ( $c->_event_state->{ $event->{event} } == $$ ) { |
268 | return 1; |
269 | } |
68f800bd |
270 | |
f9d8e3cf |
271 | return; |
272 | } |
273 | |
274 | # Mark an event as finished |
275 | sub _mark_finished { |
276 | my ( $c, $event ) = @_; |
68f800bd |
277 | |
f9d8e3cf |
278 | $c->_event_state->{ $event->{event} } = 0; |
279 | $c->_save_event_state(); |
cbf1ecfe |
280 | } |
281 | |
f9d8e3cf |
282 | # update the state file on disk |
283 | sub _save_event_state { |
284 | my $c = shift; |
68f800bd |
285 | |
f9d8e3cf |
286 | lock_store $c->_event_state, $c->config->{scheduler}->{state_file}; |
cbf1ecfe |
287 | } |
288 | |
289 | # Set::Crontab does not support day names, or '@' shortcuts |
290 | sub _prepare_cron { |
291 | my $cron = shift; |
68f800bd |
292 | |
cbf1ecfe |
293 | return $cron unless $cron =~ /\w/; |
68f800bd |
294 | |
cbf1ecfe |
295 | my %replace = ( |
296 | jan => 1, |
297 | feb => 2, |
298 | mar => 3, |
299 | apr => 4, |
300 | may => 5, |
301 | jun => 6, |
302 | jul => 7, |
303 | aug => 8, |
304 | sep => 9, |
305 | 'oct' => 10, |
306 | nov => 11, |
307 | dec => 12, |
68f800bd |
308 | |
cbf1ecfe |
309 | sun => 0, |
310 | mon => 1, |
311 | tue => 2, |
312 | wed => 3, |
313 | thu => 4, |
314 | fri => 5, |
315 | sat => 6, |
68f800bd |
316 | |
cbf1ecfe |
317 | 'yearly' => '0 0 1 1 *', |
318 | 'annually' => '0 0 1 1 *', |
319 | 'monthly' => '0 0 1 * *', |
320 | 'weekly' => '0 0 * * 0', |
321 | 'daily' => '0 0 * * *', |
322 | 'midnight' => '0 0 * * *', |
323 | 'hourly' => '0 * * * *', |
324 | ); |
68f800bd |
325 | |
cbf1ecfe |
326 | for my $name ( keys %replace ) { |
327 | my $value = $replace{$name}; |
68f800bd |
328 | |
cbf1ecfe |
329 | if ( $cron =~ /^\@$name/ ) { |
330 | $cron = $value; |
331 | last; |
332 | } |
333 | else { |
334 | $cron =~ s/$name/$value/i; |
335 | last unless $cron =~ /\w/; |
336 | } |
337 | } |
338 | |
339 | return $cron; |
340 | } |
341 | |
74e31b02 |
342 | 1; |
343 | __END__ |
344 | |
345 | =pod |
346 | |
347 | =head1 NAME |
348 | |
349 | Catalyst::Plugin::Scheduler - Schedule events to run in a cron-like fashion |
350 | |
351 | =head1 SYNOPSIS |
352 | |
353 | use Catalyst qw/Scheduler/; |
354 | |
355 | # run remove_sessions in the Cron controller every hour |
356 | __PACKAGE__->schedule( |
357 | at => '0 * * * *', |
358 | event => '/cron/remove_sessions' |
359 | ); |
360 | |
361 | # Run a subroutine at 4:05am every Sunday |
362 | __PACKAGE__->schedule( |
363 | at => '5 4 * * sun', |
364 | event => \&do_stuff, |
365 | ); |
366 | |
68f800bd |
367 | # A long-running scheduled event that must be triggered |
368 | # manually by an authorized user |
369 | __PACKAGE__->schedule( |
370 | trigger => 'rebuild_search_index', |
371 | event => '/cron/rebuild_search_index', |
372 | ); |
373 | $ wget -q http://www.myapp.com/?schedule_trigger=rebuild_search_index |
f9d8e3cf |
374 | |
74e31b02 |
375 | =head1 DESCRIPTION |
376 | |
377 | This plugin allows you to schedule events to run at recurring intervals. |
378 | Events will run during the first request which meets or exceeds the specified |
379 | time. Depending on the level of traffic to the application, events may or may |
380 | not run at exactly the correct time, but it should be enough to satisfy many |
381 | basic scheduling needs. |
382 | |
383 | =head1 CONFIGURATION |
384 | |
385 | Configuration is optional and is specified in MyApp->config->{scheduler}. |
386 | |
387 | =head2 logging |
388 | |
389 | Set to 1 to enable logging of events as they are executed. This option is |
390 | enabled by default when running under -Debug mode. Errors are always logged |
391 | regardless of the value of this option. |
392 | |
cbf1ecfe |
393 | =head2 time_zone |
394 | |
395 | The time zone of your system. This will be autodetected where possible, or |
396 | will default to UTC (GMT). You can override the detection by providing a |
397 | valid L<DateTime> time zone string, such as 'America/New_York'. |
398 | |
74e31b02 |
399 | =head2 state_file |
400 | |
401 | The current state of every event is stored in a file. By default this is |
f9d8e3cf |
402 | $APP_HOME/scheduler.state. This file is created on the first request if it |
403 | does not already exist. |
74e31b02 |
404 | |
68f800bd |
405 | =head2 yaml_file |
406 | |
407 | The location of the optional YAML event configuration file. By default this |
408 | is $APP_HOME/scheduler.yml. |
409 | |
74e31b02 |
410 | =head2 hosts_allow |
411 | |
412 | This option specifies IP addresses for trusted users. This option defaults |
413 | to 127.0.0.1. Multiple addresses can be specified by using an array |
414 | reference. This option is used for both events where auto_run is set to 0 |
415 | and for manually-triggered events. |
416 | |
417 | __PACKAGE__->config->{scheduler}->{hosts_allow} = '192.168.1.1'; |
418 | __PACKAGE__->config->{scheduler}->{hosts_allow} = [ |
419 | '127.0.0.1', |
420 | '192.168.1.1' |
421 | ]; |
422 | |
423 | =head1 SCHEDULING |
424 | |
425 | =head2 AUTOMATED EVENTS |
426 | |
427 | Events are scheduled by calling the class method C<schedule>. |
428 | |
429 | MyApp->schedule( |
430 | at => '0 * * * *', |
431 | event => '/cron/remove_sessions', |
432 | ); |
433 | |
434 | package MyApp::Controller::Cron; |
435 | |
436 | sub remove_sessions : Private { |
437 | my ( $self, $c ) = @_; |
438 | |
439 | $c->delete_expired_sessions; |
440 | } |
441 | |
442 | =head3 at |
443 | |
444 | The time to run an event is specified using L<crontab(5)>-style syntax. |
445 | |
446 | 5 0 * * * # 5 minutes after midnight, every day |
447 | 15 14 1 * * # run at 2:15pm on the first of every month |
448 | 0 22 * * 1-5 # run at 10 pm on weekdays |
449 | 5 4 * * sun # run at 4:05am every Sunday |
450 | |
451 | From crontab(5): |
452 | |
453 | field allowed values |
454 | ----- -------------- |
455 | minute 0-59 |
456 | hour 0-23 |
457 | day of month 1-31 |
458 | month 0-12 (or names, see below) |
459 | day of week 0-7 (0 or 7 is Sun, or use names) |
460 | |
461 | Instead of the first five fields, one of seven special strings may appear: |
462 | |
463 | string meaning |
464 | ------ ------- |
465 | @yearly Run once a year, "0 0 1 1 *". |
466 | @annually (same as @yearly) |
467 | @monthly Run once a month, "0 0 1 * *". |
468 | @weekly Run once a week, "0 0 * * 0". |
469 | @daily Run once a day, "0 0 * * *". |
470 | @midnight (same as @daily) |
471 | @hourly Run once an hour, "0 * * * *". |
472 | |
473 | =head3 event |
474 | |
475 | The event to run at the specified time can be either a Catalyst private |
476 | action path or a coderef. Both types of event methods will receive the $c |
477 | object from the current request, but you must not rely on any request-specific |
478 | information present in $c as it will be from a random user request at or near |
479 | the event's specified run time. |
480 | |
481 | Important: Methods used for events should be marked C<Private> so that |
482 | they can not be executed via the browser. |
483 | |
484 | =head3 auto_run |
485 | |
486 | The auto_run parameter specifies when the event is allowed to be executed. |
487 | By default this option is set to 1, so the event will be executed during the |
488 | first request that matches the specified time in C<at>. |
489 | |
490 | If set to 0, the event will only run when a request is made by a user from |
491 | an authorized address. The purpose of this option is to allow long-running |
492 | tasks to execute only for certain users. |
493 | |
494 | MyApp->schedule( |
495 | at => '0 0 * * *', |
496 | event => '/cron/rebuild_search_index', |
497 | auto_run => 0, |
498 | ); |
499 | |
500 | package MyApp::Controller::Cron; |
501 | |
502 | sub rebuild_search_index : Private { |
503 | my ( $self, $c ) = @_; |
504 | |
505 | # rebuild the search index, this may take a long time |
506 | } |
507 | |
508 | Now, the search index will only be rebuilt when a request is made from a user |
509 | whose IP address matches the list in the C<hosts_allow> config option. To |
510 | run this event, you probably want to ping the app from a cron job. |
511 | |
f9d8e3cf |
512 | 0 0 * * * wget -q http://www.myapp.com/ |
74e31b02 |
513 | |
514 | =head2 MANUAL EVENTS |
515 | |
516 | To create an event that does not run on a set schedule and must be manually |
517 | triggered, you can specify the C<trigger> option instead of C<at>. |
518 | |
519 | __PACKAGE__->schedule( |
520 | trigger => 'send_email', |
521 | event => '/events/send_email', |
522 | ); |
523 | |
524 | The event may then be triggered by a standard web request from an authorized |
525 | user. The trigger to run is specified by using a special GET parameter, |
526 | 'schedule_trigger'; the path requested does not matter. |
527 | |
528 | http://www.myapp.com/?schedule_trigger=send_email |
529 | |
530 | By default, manual events may only be triggered by requests made from |
531 | localhost (127.0.0.1). To allow other addresses to run events, use the |
68f800bd |
532 | configuration option L</hosts_allow>. |
533 | |
534 | =head1 SCHEDULING USING A YAML FILE |
535 | |
536 | As an alternative to using the schedule() method, you may define scheduled |
537 | events in an external YAML file. By default, the plugin looks for the |
538 | existence of a file called C<schedule.yml> in your application's home |
539 | directory. You can change the filename using the configuration option |
540 | L</yaml_file>. |
541 | |
542 | Modifications to this file will be re-read once per minute during the normal |
543 | event checking process. |
544 | |
545 | Here's an example YAML configuration file with 4 events. Each event is |
546 | denoted with a '-' character, followed by the same parameters used by the |
547 | C<schedule> method. Note that coderef events are not supported by the YAML |
548 | file. |
549 | |
550 | --- |
551 | - at: '* * * * *' |
552 | event: /cron/delete_sessions |
553 | - event: /cron/send_email |
554 | trigger: send_email |
555 | - at: '@hourly' |
556 | event: /cron/hourly |
557 | - at: 0 0 * * * |
558 | auto_run: 0 |
559 | event: /cron/rebuild_search_index |
74e31b02 |
560 | |
561 | =head1 SECURITY |
562 | |
563 | All events are run inside of an eval container. This protects the user from |
564 | receiving any error messages or page crashes if an event fails to run |
565 | properly. All event errors are logged, even if logging is disabled. |
566 | |
74e31b02 |
567 | =head1 PLUGIN SUPPORT |
568 | |
569 | Other plugins may register scheduled events if they need to perform periodic |
570 | maintenance. Plugin authors, B<be sure to inform your users> if you do this! |
571 | Events should be registered from a plugin's C<setup> method. |
572 | |
573 | sub setup { |
574 | my $c = shift; |
575 | $c->NEXT::setup(@_); |
576 | |
577 | if ( $c->can('schedule') ) { |
578 | $c->schedule( |
579 | at => '0 * * * *', |
580 | event => \&cleanup, |
581 | ); |
582 | } |
583 | } |
f9d8e3cf |
584 | |
585 | =head1 CAVEATS |
586 | |
587 | The time at which an event will run is determined completely by the requests |
588 | made to the application. Apps with heavy traffic may have events run at very |
589 | close to the correct time, whereas apps with low levels of traffic may see |
590 | events running much later than scheduled. If this is a problem, you can use |
591 | a real cron entry that simply hits your application at the desired time. |
592 | |
593 | 0 * * * * wget -q http://www.myapp.com/ |
594 | |
595 | Events which consume a lot of time will slow the request processing for the |
596 | user who triggers the event. For these types of events, you should use |
597 | auto_run => 0 or manual event triggering. |
598 | |
599 | =head1 PERFORMANCE |
600 | |
601 | The plugin only checks once per minute if any events need to be run, so the |
602 | overhead on each request is minimal. On my test server, the difference |
603 | between running with Scheduler and without was only around 0.02% (0.004 |
604 | seconds). |
605 | |
68f800bd |
606 | Of course, when a scheduled event runs, performance will depend on what's |
607 | being run in the event. |
74e31b02 |
608 | |
609 | =head1 SEE ALSO |
610 | |
611 | L<crontab(5)> |
612 | |
613 | =head1 AUTHOR |
614 | |
615 | Andy Grundman, <andy@hybridized.org> |
616 | |
617 | =head1 COPYRIGHT |
618 | |
619 | This program is free software, you can redistribute it and/or modify it |
620 | under the same terms as Perl itself. |
621 | |
622 | =cut |