CallableUpdate.php

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<?php

class MWCallableUpdate implements DeferrableUpdate {
    private $callback;

    public function __construct( $callback ) {
        if ( !is_callable( $callback ) ) {
            throw new MWException( 'Not a valid callback/closure!' );
        }
        $this->callback = $callback;
    }

    public function doUpdate() {
        call_user_func( $this->callback );
    }
}