NullJob.php

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<?php
class NullJob extends Job {
    function __construct( $title, $params, $id = 0 ) {
        parent::__construct( 'null', $title, $params, $id );
        if ( !isset( $this->params['lives'] ) ) {
            $this->params['lives'] = 1;
        }
        if ( !isset( $this->params['usleep'] ) ) {
            $this->params['usleep'] = 0;
        }
        $this->removeDuplicates = !empty( $this->params['removeDuplicates'] );
    }

    public function run() {
        if ( $this->params['usleep'] > 0 ) {
            usleep( $this->params['usleep'] );
        }
        if ( $this->params['lives'] > 1 ) {
            $params = $this->params;
            $params['lives']--;
            $job = new self( $this->title, $params );
            JobQueueGroup::singleton()->push( $job );
        }
        return true;
    }
}