1// Copyright Istio Authors
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package serviceregistry
16
17import (
18	"istio.io/istio/pilot/pkg/model"
19)
20
21// Instance of a service registry. A single service registry combines the capabilities of service discovery
22// and the controller for managing asynchronous events.
23type Instance interface {
24	model.Controller
25	model.ServiceDiscovery
26
27	// Provider backing this service registry (i.e. Kubernetes, Consul, etc.)
28	Provider() ProviderID
29
30	// Cluster for which the service registry applies. Only needed for multicluster systems.
31	Cluster() string
32}
33
34var _ Instance = &Simple{}
35
36// Simple Instance implementation, where fields are set individually.
37type Simple struct {
38	ProviderID ProviderID
39	ClusterID  string
40
41	model.Controller
42	model.ServiceDiscovery
43}
44
45func (r Simple) Provider() ProviderID {
46	return r.ProviderID
47}
48
49func (r Simple) Cluster() string {
50	return r.ClusterID
51}
52