Service registration
Service can be different forms. It is usually defined by a Java
interface.
Service is created by a service provider:
- 1. Creates the objects that implement the service
- 2. Register the service object with lookup service
- 3. Stays alive in a server role, performing various tasks such as
keeping the service "alive"
- Fig 2 querying for a service locator
- Fig 3 Registrar returned
- Fig 4 Service uploaded
