// Copyright 2016 IBM Corporation
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package api

// ServiceDiscovery defines the interface used for discovering service instances.
type ServiceDiscovery interface {

	// ListServices queries for the list of services for which instances are currently registered.
	ListServices() ([]string, error)

	// ListInstances queries for the list of service instances currently registered.
	ListInstances() ([]*ServiceInstance, error)

	// ListServiceInstances queries for the list of service instances currently registered for the given service.
	ListServiceInstances(serviceName string) ([]*ServiceInstance, error)
}
