code: public FirewallRuleInner createOrUpdate(String resourceGroupName, String accountName, String firewallRuleName, CreateOrUpdateFirewallRuleParameters parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, accountName, firewallRuleName, parameters).toBlocking().single().body();
      }
docs: Creates or updates the specified firewall rule. During update, the firewall rule with the specified name will be replaced with this new firewall rule.
  
  @param resourceGroupName The name of the Azure resource group.
  @param accountName The name of the Data Lake Store account.
  @param firewallRuleName The name of the firewall rule to create or update.
  @param parameters Parameters supplied to create or update the firewall rule.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the FirewallRuleInner object if successful.