silverstripe-australia / advancedworkflow

	 *

	 * @param int $when Timestamp to start this job, or null to start immediately

	 */

	protected function ensurePublishJob($when) {

		// Check if there is a prior job

		if($this->owner->PublishJobID) {

			$job = $this->owner->PublishJob();

			// Use timestamp for sake of comparison.

			if($job && $job->exists() && strtotime($job->StartAfter) == $when) {

				return;

			}

			$this->clearPublishJob();

		}

		// Create a new job with the specified schedule

		$job = new WorkflowPublishTargetJob($this->owner, 'publish');

		$this->owner->PublishJobID = Injector::inst()->get('QueuedJobService')

				->queueJob($job, $when ? date('Y-m-d H:i:s', $when) : null);

	}

	/**

	 * Ensure the existence of an unpublish job at the specified time

	 *

	 * @param int $when Timestamp to start this job, or null to start immediately

	 */

	protected function ensureUnPublishJob($when) {

		// Check if there is a prior job

		if($this->owner->UnPublishJobID) {

			$job = $this->owner->UnPublishJob();

			// Use timestamp for sake of comparison.

			if($job && $job->exists() && strtotime($job->StartAfter) == $when) {

				return;

			}

			$this->clearUnPublishJob();

		}

		// Create a new job with the specified schedule

		$job = new WorkflowPublishTargetJob($this->owner, 'unpublish');

		$this->owner->UnPublishJobID = Injector::inst()->get('QueuedJobService')

			->queueJob($job, $when ? date('Y-m-d H:i:s', $when) : null);

	}

	/**

	 * {@see PublishItemWorkflowAction} for approval of requested publish dates