![]() To ensure our task is only run once per hour. \Drupal::state()->set('example.last_run', REQUEST_TIME) With that in mind, we could do something like: $last_run = \Drupal::state()->get('example.last_run', 0) Think: CSRF tokens, tracking when something non-critical last happened … So, use State API to store transient information, that is okay to lose after a reset. You can reset a system, losing all state. You will never want to deploy it between environments. It is specific to an individual environment. One way to remember that is using State API which stores transient information, the documentation explains it as such: There are a couple of things we have to take in to consideration: Rebuild cache and next time cron runs your hook will be called and executed. Implementing Cron tasks in DrupalĬron tasks are defined by implementing the hook_cron hook in your module, just like in previous Drupal versions. Read the Configuring cron jobs using the cron command on for more details. If you use a shared host it's most likely you can do that right off in your control panel, and if you have your own server you can use the crontab command. Configuring this up depends on what system you use, but typically isn't that hard to do. The second approach is to actually setup a cron job that runs at the intervals you specify. Secondly, if the website is complex or the cron tasks are heavy the memory can exceed and slow down the page request. If no one visits your website the cron doesn't run. There are two things to consider when using this approach. Fetch aggregated content when using Aggregator module.įirst we have the Automated Cron core module (sometimes referred as Poor man's cron) which during a page request checks when cron was last run and if it has been to long it processes the cron tasks as part of that requests.Temporary uploaded files are deleted by the File module.If you have dblog (Database logging) enabled this task deletes messages after a set limit. It also sends an email if you configured it to do so. ![]() If you have Update Manager module enabled, a task is run to look for updates.Publishing or unpublishing nodes when using the Scheduler module.Updating search indexes for your search engine when using Search core module.This depends entirely on what modules you have enabled and use of course, but here are some pretty usual examples on what tasks are run in cron: What tasks does Drupal perform when cron is run? Cron in DrupalĬron configuration can be found at Administration > Configuration > System > Cron or some other task(s) that has to be automated and run at specific intervals. Send reminder emails to users to activate their accounts.Send a weekly newsletter every Monday at 12:00 a.m.Cron is used to perform periodic actions. ![]()
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