This figure below represents the interface exposed by the registry service:

The default registry implementation is realized as following:

1. A client endpoint realizes a lookup on the registry.
2. If the providerEndpoint is a local endpoint or it is already in cache, the provider endpoint information are transmitted to the client.
3. If it is not stored in the registry, the registry consults this neighbours registries of close in close to get prodiver endpoint information ad set them in cache before responding to client.