@Override
    public String toString() {
        if (cache == null) {
            StringBuilder ret = new StringBuilder("");
            for (int i = 0; i < hops.size(); ++i) {
                ret.append(hops.get(i));
                if (i < hops.size() - 1) {
                    ret.append(" ");
                }
            }
            cache = ret.toString();
        }
        return cache;
    }
<p>Clears the list of hops that make up this route.</p>

@return This, to allow chaining.
messagebus/src/main/java/com/yahoo/messagebus/routing/Route.java