code: public ServiceFuture<FirewallRuleInner> getAsync(String resourceGroupName, String accountName, String firewallRuleName, final ServiceCallback<FirewallRuleInner> serviceCallback) {
          return ServiceFuture.fromResponse(getWithServiceResponseAsync(resourceGroupName, accountName, firewallRuleName), serviceCallback);
      }
docs: Gets the specified Data Lake Store 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 retrieve.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object