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<?php
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/**
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* @file
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* job scheduler module.
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*/
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/**
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* Collects and returns scheduler info.
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*
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* @see hook_cron_job_scheduler_info()
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*
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* @param $name
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* Name of the schedule
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* @return array
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* Information for the schedule if $name, all the information if not
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*/
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function job_scheduler_info($name = NULL) {
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$info = &drupal_static(__FUNCTION__);
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if (!$info) {
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$info = module_invoke_all('cron_job_scheduler_info');
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drupal_alter('cron_job_scheduler_info', $info);
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}
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if ($name) {
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return isset($info[$name]) ? $info[$name] : NULL;
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}
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else {
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return $info;
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}
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}
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/**
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* Implements hook_cron().
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*/
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function job_scheduler_cron() {
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// Reschedule all jobs if requested.
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if (variable_get('job_scheduler_rebuild_all', FALSE)) {
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foreach (job_scheduler_info() as $name => $info) {
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job_scheduler_rebuild_scheduler($name, $info);
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}
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variable_set('job_scheduler_rebuild_all', FALSE);
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return;
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}
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// Reschedule stuck periodic jobs after one hour.
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db_update('job_schedule')
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->fields(array(
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'scheduled' => 0,
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))
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->condition('scheduled', REQUEST_TIME - 3600, '<')
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->condition('periodic', 1)
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->execute();
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// Query and dispatch scheduled jobs.
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// Process a maximum of 200 jobs in a maximum of 30 seconds.
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$start = time();
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$total =
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$failed = 0;
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$jobs = db_select('job_schedule', NULL, array('fetch' => PDO::FETCH_ASSOC))
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->fields('job_schedule')
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->condition('scheduled', 0)
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->condition('next', REQUEST_TIME, '<=')
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->orderBy('next', 'ASC')
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->range(0, 200)
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->execute();
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foreach ($jobs as $job) {
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try {
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JobScheduler::get($job['name'])->dispatch($job);
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}
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catch (Exception $e) {
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watchdog('job_scheduler', $e->getMessage(), array(), WATCHDOG_ERROR);
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$failed++;
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// Drop jobs that have caused exceptions
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JobScheduler::get($job['name'])->remove($job);
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}
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$total++;
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if (time() > ($start + 30)) {
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break;
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}
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}
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// Leave a note on how much time we spent processing.
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watchdog('job_scheduler', 'Finished processing scheduled jobs (!time s, !total total, !failed failed).', array('!time' => format_interval(time() - $start), '!total' => $total, '!failed' => $failed));
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}
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/**
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* Implements hook_modules_enabled().
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*/
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function job_scheduler_modules_enabled($modules) {
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job_scheduler_rebuild_all();
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}
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/**
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* Implements hook_modules_disabled().
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*/
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function job_scheduler_modules_disabled($modules) {
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job_scheduler_rebuild_all();
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}
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/**
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* Rebuild scheduled information after enable/disable modules
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*
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* @todo What should we do about missing ones when disabling their module?
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*/
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function job_scheduler_rebuild_all() {
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variable_set('job_scheduler_rebuild_all', TRUE);
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}
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/**
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* Rebuild a single scheduler
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*/
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function job_scheduler_rebuild_scheduler($name, $info = NULL) {
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$info = $info ? $info : job_scheduler_info($name);
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if (!empty($info['jobs'])) {
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$scheduler = JobScheduler::get($name);
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foreach ($info['jobs'] as $job) {
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if (!$scheduler->check($job)) {
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$scheduler->set($job);
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}
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}
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}
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}
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/**
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* Implements hook_cron_queue_info().
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*
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* Provide queue worker information for jobs declared in
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* hook_cron_job_scheduler_info().
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*/
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function job_scheduler_cron_queue_info() {
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$queue = array();
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foreach (job_scheduler_info() as $name => $info) {
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if (!empty($info['jobs']) && !empty($info['queue name'])) {
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$queue[$info['queue name']] = array(
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'worker callback' => 'job_scheduler_cron_queue_worker',
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'time' => 60, // Some reasonable default as we don't know
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);
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}
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}
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return $queue;
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}
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/**
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* Execute job worker from queue
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*
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* Providing our own worker has the advantage that we can reschedule the job or take care of cleanup
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* Note that as we run the execute() action, the job won't be queued again this time.
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*/
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function job_scheduler_cron_queue_worker($job) {
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try {
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JobScheduler::get($job['name'])->execute($job);
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}
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catch (Exception $e) {
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watchdog('job_scheduler', $e->getMessage(), array(), WATCHDOG_ERROR);
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// Drop jobs that have caused exceptions
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JobScheduler::get($job['name'])->remove($job);
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}
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}
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