code: public synchronized NetworkServiceDescriptorAgent getNetworkServiceDescriptorAgent() {
      if (this.networkServiceDescriptorAgent == null) {
        if (isService) {
          this.networkServiceDescriptorAgent =
              new NetworkServiceDescriptorAgent(
                  this.serviceName,
                  this.projectId,
                  this.sslEnabled,
                  this.nfvoIp,
                  this.nfvoPort,
                  this.version,
                  this.serviceKey);
        } else {
          this.networkServiceDescriptorAgent =
              new NetworkServiceDescriptorAgent(
                  this.username,
                  this.password,
                  this.projectId,
                  this.sslEnabled,
                  this.nfvoIp,
                  this.nfvoPort,
                  this.version);
        }
      }
      return this.networkServiceDescriptorAgent;
    }
docs: Returns a NetworkServiceDescriptorAgent with which requests regarding NetworkServiceDescriptors
  can be sent to the NFVO.
  
  @return a NetworkServiceDescriptorAgent