Module io.helidon.service.registry

Package io.helidon.service.registry

Annotation Interface Service.Contract

Enclosing class:

Service

@Documented
@Retention(CLASS)
@Target(TYPE)
public static @interface Service.Contract

The Contract annotation is used to relay significance to the type that it annotates. While remaining optional in its use, it is typically placed on an interface definition to signify that the given type can be used for lookup in the service registry. While normally placed on interface types, it can also be placed on abstract and concrete class as well. The main point is that a Contract is the focal point for service lookup.

If the developer does not have access to the source to place this annotation on the interface definition directly then consider using Service.ExternalContracts instead - this annotation can be placed on the implementation class implementing the given Contract interface(s).

Default behavior of the service registry is to only provide support lookup based on contracts.