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;
        }
}