type serviceInstancesStore struct {
	ip2instance map[string][]*model.ServiceInstance
	// service instances by hostname -> config
	instances map[instancesKey]map[configKeyWithParent][]*model.ServiceInstance
	// instances only for serviceentry
	instancesBySE map[types.NamespacedName]map[configKey][]*model.ServiceInstance
	// instancesByHostAndPort tells whether the host has instances.

	store := serviceInstancesStore{
		ip2instance:            map[string][]*model.ServiceInstance{},
		instances:              map[instancesKey]map[configKeyWithParent][]*model.ServiceInstance{},
		instancesBySE:          map[types.NamespacedName]map[configKey][]*model.ServiceInstance{},
		instancesByHostAndPort: sets.Set[hostPort]{},
	}
	instances := []*model.ServiceInstance{

		}
		if len(sd.serviceInstances.instances[key]) != 0 {
			t.Fatalf("service instances store `instances` memory leak, expect 0, got %d", len(sd.serviceInstances.instances[key]))
		}
		if len(sd.serviceInstances.instancesBySE[namespacedName]) != 0 {
			t.Fatalf("service instances store `instancesBySE` memory leak, expect 0, got %d", len(sd.serviceInstances.instancesBySE[namespacedName]))
		}

	curr config.Config,
	services []*model.Service,
) (map[configKey][]*model.ServiceInstance, []*model.ServiceInstance) {
	currentServiceEntry := curr.Spec.(*networking.ServiceEntry)
	var serviceInstances []*model.ServiceInstance
	serviceInstancesByConfig := map[configKey][]*model.ServiceInstance{}
	// for service entry with labels
	if currentServiceEntry.WorkloadSelector != nil {

				for _, serviceInstance := range tt.out {
					serviceInstance.Endpoint.Locality = model.Locality{
						Label:     tt.wle.Locality,
						ClusterID: tt.clusterID,
					}
					serviceInstance.Endpoint.Network = network.ID(tt.wle.Network)
					serviceInstance.Endpoint.Labels = labelutil.AugmentLabels(serviceInstance.Endpoint.Labels, tt.clusterID, tt.wle.Locality, "", network.ID(tt.wle.Network))

func (s *Controller) convertWorkloadEntryToServiceInstances(wle *networking.WorkloadEntry, services []*model.Service,
	se *networking.ServiceEntry, configKey *configKey, clusterID cluster.ID,
) []*model.ServiceInstance {
	out := make([]*model.ServiceInstance, 0, len(services)*len(se.Ports))
	for _, service := range services {
		for _, port := range se.Ports {
			out = append(out, s.convertEndpoint(service, port, wle, configKey, clusterID))
		}
	}

     * @param serviceType The type to make this service visible as.
     * @param serviceInstance The service implementation.
     */
    <T> void add(Class<T> serviceType, T serviceInstance);

    /**

			TargetPort:  e.Endpoint.EndpointPort,
		},
	}
}

// DeepCopy creates a copy of ServiceInstance.
func (instance *ServiceInstance) DeepCopy() *ServiceInstance {
	return &ServiceInstance{
		Service:  instance.Service.DeepCopy(),
		Endpoint: instance.Endpoint.DeepCopy(),
		ServicePort: &Port{
			Name:     instance.ServicePort.Name,
			Port:     instance.ServicePort.Port,
			Protocol: instance.ServicePort.Protocol,
		},

        assertMutable();
        ownServices.add(new FixedInstanceService(this, serviceType, serviceInstance));
        return this;
    }

    /**
     * Adds a service instance to this registry. The given object is closed when this registry is closed.
     */
    public DefaultServiceRegistry add(Object serviceInstance) {

		buildServiceWithPort("test2.com", 81, protocol.Unsupported, tnow),
		buildServiceWithPort("test3.com", 82, protocol.TCP, tnow),
	}
	instances := make([]*model.ServiceInstance, 0, len(services))
	for _, s := range services {
		instances = append(instances, &model.ServiceInstance{
			Service: s,
			Endpoint: &model.IstioEndpoint{
				EndpointPort: uint32(s.Ports[0].Port),
				Address:      "1.1.1.1",
			},