src/main/java/de/dosmike/sponge/megamenus/impl/AbstractMenuRenderer.java
synchronized void render() {
        if (!valid) {
            viewers.forEach(this::render);
            valid = true;
        }
    }
/**
     * Refresh/redraw this menu for all current viewers
     */
Refresh/redraw this menu for all current viewers
Refresh / redraw this menu for all current viewers
synchronized void render() {
        if (!valid) {
            viewers.forEach(this::render);
            valid = true;
        }
    }
synchronized void render ( ) { if ( ! valid ) { viewers . forEach ( this :: render ) ; valid = true ; } }
Refresh/redraw this menu for all current viewers
Refresh / redraw this menu for all current viewers