TransactionRoundDefiningUpdate.php

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<?php
 
class TransactionRoundDefiningUpdate implements DeferrableUpdate, DeferrableCallback {
    private $callback;
    private $fname;
 
    public function __construct( callable $callback, $fname = 'unknown' ) {
        $this->callback = $callback;
        $this->fname = $fname;
    }
 
    public function doUpdate() {
        call_user_func( $this->callback );
    }
 
    public function getOrigin() {
        return $this->fname;
    }
}