![]() In Linux terminology, cron operates as a daemon or a background process that executes non-interactive jobs on a web server. A cron job is important in CMS website publishing. The timing pattern for the script is established by the crontab or cron table which establishes a repeating schedule for the script to run. Cron is the software component on the web server that allows the job to be scheduled. ![]() Cron job definitionĪ cron job is an automated task on a Linux-based web server that is run by the command line at set intervals of time repeatedly. You can schedule cron jobs with cPanel, Plesk, and other admin tools. A cron job instructs plugin and module elements to update their settings, download content from APIs, clear caches, or perform other tasks related to automation. WP-Cron is used by the WordPress CMS for scheduling jobs related to plugins and themes. A cron job is used by CMS platforms like WordPress and Drupal in web publishing for scheduling automated tasks related to module functionality and maintenance, requiring web server configuration. On a technical level, a cron job operates on Linux web servers as directed by the settings in the crontab or cron table file at fixed intervals of time.Ī cron job executes a script that runs various commands on a web server as required by the software being hosted. Here is the code of the controller.A cron job is a repetitive task on a web server that runs as a shell script or command line function on the basis of a timing pattern established by administrators. You can see the tree module here: web/modules/custom/exqueue01/ A Cron QueueWorker plugin src/Plugin/QueueWorker/ExQueue01.php that will process each item in the queue. GetData() - Get external data and insert the data in the queue 'exqueue_import'.ĭeleteTheQueue() - Delete all item in the queue.Ģ. A controller class src/Controller/ExQueueController.php with its corresponding route in and two main methods: Next, when Cron runs,, we'll create a node page with a QueueWorker plugin for each item in the queue. In this example module we'll generate a queue with a controller, importing the title and the description tags form the Drupal Planet RSS file. Remember that the Drupal cron is 'poor man’s cron', as it depends on page requests for its execution even if there is a way to execute it with a linux crontab. ![]() This is also a more reliable method because it uses fewer resources and it is independent of any page request. Today we'll create the queue with a controller and process it with a QueueWorker plugin when cron runs or manually with Drupal Console.Ĭreating the queue with a controller has the advantage of allowing us to use an external crontab (e.g., a Linux crontab), so we won't need Drupal’s cron at all to run the controller, allowing us to launch it when we need it. As a batch process claiming each item of the queue in a service or in a controller As a batch process also with QueueWorker plugin but extending a base plugin ![]() As a cron process with a QueueWorker plugin To process the queue, we also have different options: There are several ways to create a queue: To do so, we are going to put some tasks or data in a queue (create the queue) and later we will process those tasks with a QueueWorker plugin (process the queue), usually triggered by cron. Queues are particularly important when we need to stash some tasks for later processing.
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