File scheduler.php

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<?php

namespace SIW;

/**
 * Scheduler voor cron jobs
 * 
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 * 
 * @todo      Import van Nederlandse projecten
 */
class Scheduler {

    /**
     * Tijdstip achtergrondprogramma's
     *
     * @var string
     */
    const TS_SCHEDULED_JOBS = '03:00';

    /**
     * Tijdstip bijwerken groepsprojecten
     *
     * @var string
     */
    const TS_UPDATE_PROJECTS = '1:00';

    /**
     * Tijdstip bijwerken vrije plaatsen
     *
     * @var string
     */
    const TS_UPDATE_FREE_PLACES = '2:00';

    /**
     * Optienaam
     * 
     * @var string
     */
    const OPTION_NAME = 'siw_scheduled_cron_jobs';

    /**
     * Interval tussen jobs in minuten
     * 
     * @var int
     */
    const CRON_JOB_INTERVAL = 5;

    /**
     * Jobs
     *
     * @var array
     */
    protected static $jobs = [];


    /**
     * Init
     */
    public static function init() {
        $self = new self();
        add_action( 'siw_update_plugin', [ $self, 'schedule_events'] );
    }

    /**
     * Plant jobs en andere processen in
     */
    public function schedule_events() {
        $this->unschedule_jobs();
        $this->schedule_jobs();
        $this->schedule_update_free_places();
        $this->schedule_update_projects();
    }

    /**
     * Plant jobs in
     */
    protected function schedule_jobs() {
        $timestamp = Util::convert_timestamp_to_gmt( strtotime( 'tomorrow ' . self::TS_SCHEDULED_JOBS ) );
        foreach ( self::$jobs as $index => $job ) {
            wp_schedule_event( $timestamp + ( $index * self::CRON_JOB_INTERVAL * MINUTE_IN_SECONDS ), 'daily', $job );
        }
        $this->set_scheduled_jobs( self::$jobs );
    }

    /**
     * Plant updaten van vrije plaatsen in
     */
    protected function schedule_update_free_places() {
        $new_timestamp = Util::convert_timestamp_to_gmt( strtotime( 'tomorrow ' . self::TS_UPDATE_FREE_PLACES ) );

        if ( wp_next_scheduled( 'siw_update_free_places' ) ) {
            wp_clear_scheduled_hook( 'siw_update_free_places' );
        }

        wp_schedule_event( $new_timestamp, 'daily', 'siw_update_free_places' ); 
    }

    /**
     * Plant update van groepsprojecten in
     */
    protected function schedule_update_projects() {
        $new_timestamp = Util::convert_timestamp_to_gmt( strtotime( 'tomorrow ' . self::TS_UPDATE_PROJECTS ) );
        if ( wp_next_scheduled( 'siw_update_workcamps' ) ) {
            wp_clear_scheduled_hook( 'siw_update_workcamps' );
        }
        wp_schedule_event( $new_timestamp, 'daily', 'siw_update_workcamps' );       
    }

    /**
     * Voegt taak toe
     *
     * @param string $hook
     */
    public static function add_job( string $hook ) {
        self::$jobs[] = $hook;
    }

    /**
     * Verwijdert ingeplande taken
     */
    protected function unschedule_jobs() {
        $scheduled_jobs = $this->get_scheduled_jobs();
        foreach ( $scheduled_jobs as $job ) {
            if ( wp_next_scheduled( $job ) ) {
                wp_clear_scheduled_hook( $job );
            }
        }
    }

    /**
     * Haalt ingeplande taken op uit database
     * 
     * @return array
     */
    protected function get_scheduled_jobs() {
        return (array) get_option( self::OPTION_NAME );
    }

    /**
     * Slaat ingeplande taken op in database
     *
     * @param array $jobs
     */
    protected function set_scheduled_jobs( array $jobs = [] ) {
        update_option( self::OPTION_NAME, $jobs, false );
    }
}

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