job_scheduler.module in Job Scheduler 7.2
Same filename and directory in other branches
Main file for the Job Scheduler.
File
job_scheduler.moduleView source
<?php
/**
* @file
* Main file for the Job Scheduler.
*/
/**
* Implements hook_help().
*
* @codingStandardsIgnoreStart
*/
function job_scheduler_help($path, $arg) {
switch ($path) {
case 'admin/help#job_scheduler':
$output = '<h3>' . t('About') . '</h3>';
$output .= '<p>' . t('Simple API for scheduling tasks once at a predetermined time or periodically at a fixed interval.') . '</p>';
$output .= '<h3>' . t('Usage') . '</h3>';
$output .= '<p>' . t('Declare scheduler.') . '</p>';
$output .= '<xmp>' . 'function example_cron_job_scheduler_info() {
$schedulers - array();
$schedulers[\'example_unpublish\'] - array(
\'worker callback\' -> \'example_unpublish_nodes\',
);
return $schedulers;
}' . '</xmp>';
$output .= '<p>' . t('Add a job.') . '</p>';
$output .= '<xmp>' . '$job - array(
\'type\' -> \'story\',
\'id\' -> 12,
\'period\' -> 3600,
\'periodic\' -> TRUE,
);
JobScheduler::get(\'example_unpublish\')->set($job);' . '</xmp>';
//
$output .= '<p>' . t('Work off a job.') . '</p>';
$output .= '<xmp>' . 'function example_unpublish_nodes($job) {
// Do stuff.
}' . '</xmp>';
$output .= '<p>' . t('Remove a job.') . '</p>';
$output .= '<xmp>' . '$job - array(
\'type\' -> \'story\',
\'id\' -> 12,
);
JobScheduler::get(\'example_unpublish\')->remove($job);' . '</xmp>';
$output .= '<p>' . t('Optionally jobs can declared together with a schedule in a: hook_cron_job_scheduler_info().') . '</p>';
$output .= '<xmp>' . 'function example_cron_job_scheduler_info() {
$schedulers - array();
$schedulers[\'example_unpublish\'] - array(
\'worker callback\' -> \'example_unpublish_nodes\',
\'jobs\' -> array(
array(
\'type\' -> \'story\',
\'id\' -> 12,
\'period\' -> 3600,
\'periodic\' -> TRUE,
),
)
);
return $schedulers;
}' . '</xmp>';
$output .= '<p>' . t("Jobs can have a 'crontab' instead of a period. Crontab syntax are Unix-like formatted crontab lines.") . '</p>';
$output .= '<p>' . t('Example of job with crontab.') . '</p>';
$output .= '<p>' . t("This will create a job that will be triggered from monday to friday, from january to july, every two hours.") . '</p>';
$output .= '<xmp>' . 'function example_cron_job_scheduler_info() {
$schedulers - array();
$schedulers[\'example_unpublish\'] - array(
\'worker callback\' -> \'example_unpublish_nodes\',
\'jobs\' -> array(
array(
\'type\' -> \'story\',
\'id\' -> 12,
\'crontab\' -> \'0 */2 * january-july mon-fri\',
\'periodic\' -> TRUE,
),
)
);
return $schedulers;
}' . '</xmp>';
$output .= '<p>' . t('Read more about crontab syntax: <a href="@url_crontab_sintax" target="blank">@url_crontab_sintax</a>', array(
'@url_crontab_sintax' => 'http://linux.die.net/man/5/crontab',
)) . '</p>';
return $output;
}
}
// @codingStandardsIgnoreEnd
/**
* Collects and returns scheduler info.
*
* @param string $name
* Name of the schedule.
*
* @see hook_cron_job_scheduler_info()
*
* @return array
* Information for the schedule if $name, all the information if not
*/
function job_scheduler_info($name = NULL) {
$info =& drupal_static(__FUNCTION__);
if (!$info) {
$info = module_invoke_all('cron_job_scheduler_info');
drupal_alter('cron_job_scheduler_info', $info);
}
if ($name) {
return isset($info[$name]) ? $info[$name] : NULL;
}
else {
return $info;
}
}
/**
* Implements hook_cron().
*/
function job_scheduler_cron() {
// Reschedule all jobs if requested.
if (variable_get('job_scheduler_rebuild_all', FALSE)) {
foreach (job_scheduler_info() as $name => $info) {
job_scheduler_rebuild_scheduler($name, $info);
}
variable_set('job_scheduler_rebuild_all', FALSE);
return;
}
// Reschedule stuck periodic jobs after one hour.
db_update('job_schedule')
->fields(array(
'scheduled' => 0,
))
->condition('scheduled', REQUEST_TIME - 3600, '<')
->condition('periodic', 1)
->execute();
// Query and dispatch scheduled jobs.
// Process a maximum of 200 jobs in a maximum of 30 seconds.
$start = time();
$total = $failed = 0;
$jobs = db_select('job_schedule', NULL, array(
'fetch' => PDO::FETCH_ASSOC,
))
->fields('job_schedule')
->condition('scheduled', 0)
->condition('next', REQUEST_TIME, '<=')
->orderBy('next', 'ASC')
->range(0, 200)
->execute();
foreach ($jobs as $job) {
$job['data'] = unserialize($job['data']);
try {
JobScheduler::get($job['name'])
->dispatch($job);
} catch (Exception $e) {
watchdog('job_scheduler', $e
->getMessage(), array(), WATCHDOG_ERROR);
$failed++;
// Drop jobs that have caused exceptions.
JobScheduler::get($job['name'])
->remove($job);
}
$total++;
if (time() > $start + 30) {
break;
}
}
// If any jobs were processed, log how much time we spent processing.
if ($total || $failed) {
watchdog('job_scheduler', 'Finished processing scheduled jobs (!time, !total total, !failed failed).', array(
'!time' => format_interval(time() - $start),
'!total' => $total,
'!failed' => $failed,
));
}
}
/**
* Implements hook_modules_enabled().
*/
function job_scheduler_modules_enabled($modules) {
job_scheduler_rebuild_all();
}
/**
* Implements hook_modules_disabled().
*/
function job_scheduler_modules_disabled($modules) {
job_scheduler_rebuild_all();
}
/**
* Rebuild scheduled information after enable/disable modules.
*
* @todo What should we do about missing ones when disabling their module?
*/
function job_scheduler_rebuild_all() {
variable_set('job_scheduler_rebuild_all', TRUE);
}
/**
* Rebuild a single scheduler.
*/
function job_scheduler_rebuild_scheduler($name, $info) {
if (!empty($info['jobs'])) {
$scheduler = JobScheduler::get($name);
foreach ($info['jobs'] as $job) {
if (!$scheduler
->check($job)) {
$scheduler
->set($job);
}
}
}
}
/**
* Implements hook_cron_queue_info().
*
* Provide queue worker information for jobs declared in
* hook_cron_job_scheduler_info().
*/
function job_scheduler_cron_queue_info() {
$queue = array();
foreach (job_scheduler_info() as $info) {
if (!empty($info['jobs']) && !empty($info['queue name'])) {
$queue[$info['queue name']] = array(
'worker callback' => 'job_scheduler_cron_queue_worker',
// Some reasonable default as we don't know.
'time' => 60,
);
}
}
return $queue;
}
/**
* Execute job worker from queue.
*
* Providing our own worker has the advantage that we can reschedule the job or
* take care of cleanup
* Note that as we run the execute() action, the job won't be queued again this
* time.
*/
function job_scheduler_cron_queue_worker($job) {
try {
JobScheduler::get($job['name'])
->execute($job);
} catch (Exception $e) {
watchdog('job_scheduler', $e
->getMessage(), array(), WATCHDOG_ERROR);
// Drop jobs that have caused exceptions.
JobScheduler::get($job['name'])
->remove($job);
}
}
Functions
Name![]() |
Description |
---|---|
job_scheduler_cron | Implements hook_cron(). |
job_scheduler_cron_queue_info | Implements hook_cron_queue_info(). |
job_scheduler_cron_queue_worker | Execute job worker from queue. |
job_scheduler_help | Implements hook_help(). |
job_scheduler_info | Collects and returns scheduler info. |
job_scheduler_modules_disabled | Implements hook_modules_disabled(). |
job_scheduler_modules_enabled | Implements hook_modules_enabled(). |
job_scheduler_rebuild_all | Rebuild scheduled information after enable/disable modules. |
job_scheduler_rebuild_scheduler | Rebuild a single scheduler. |