code: public static base_response update(nitro_service client, cachepolicy resource) throws Exception {
  		cachepolicy updateresource = new cachepolicy();
  		updateresource.policyname = resource.policyname;
  		updateresource.rule = resource.rule;
  		updateresource.action = resource.action;
  		updateresource.storeingroup = resource.storeingroup;
  		updateresource.invalgroups = resource.invalgroups;
  		updateresource.invalobjects = resource.invalobjects;
  		updateresource.undefaction = resource.undefaction;
  		return updateresource.update_resource(client);
  	}
docs: Use this API to update cachepolicy.