code: public SyncAgentInner createOrUpdate(String resourceGroupName, String serverName, String syncAgentName, String syncDatabaseId) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, serverName, syncAgentName, syncDatabaseId).toBlocking().last().body();
      }
docs: Creates or updates a sync agent.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server on which the sync agent is hosted.
  @param syncAgentName The name of the sync agent.
  @param syncDatabaseId ARM resource id of the sync database in the sync agent.
  @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 SyncAgentInner object if successful.