public <T> T get(String viewId, String clientId, Supplier<T> supplier) {
            return get(viewId, clientId, true, supplier);
        }
Gets or create the multiview state attached to a component in a specific view.

@param viewId viewId of a page
@param clientId clientId of a component
@param supplier bean state instance
@param <T> bean state generic

@return multiview state bean attached to a component
primefaces/src/main/java/org/primefaces/PrimeFaces.java