public <R extends Request<T>> R setPriority(Priority priority) {
        this.priority = priority;
        return (R) this;
    }
public < R extends Request < T > > R setPriority ( Priority priority ) { this . priority = priority ; return ( R ) this ; }
Set {@link Priority} of this request; {@link Priority#NORMAL} by default.

@param priority {@link Priority} of this request