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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition If such an entity was provided with references to lookup services located outside of the entity's multicast radius that contain services needed by the entity, the entity could contact each lookup service and retrieve the desired service references One way to provide the entity with access to those lookup services might be to configure the entity to find and use a lookup discovery service, operating beyond the entity's range, that can employ multicast discovery to find nearby lookup services belonging to groups in which the entity has expressed interest After acquiring references to the targeted lookup services, the lookup discovery service would pass those references to the entity, providing the entity with access to the services registered with each lookup service In this way, the entity participates in the multicast discovery protocols through a proxy relationship with the lookup discovery service, gaining access not only to lookup services outside of its own range, but also to all of the services registered with those lookup services Note that the scenario just described does not come without restrictions For the lookup discovery service to be able to "link" an entity with lookup services in the way just described, the lookup discovery service must be registered with a lookup service having a location that either is known to the entity or is within the multicast radius of the entity Furthermore, the lookup discovery service must be running on a host that is located within the multicast radius of the lookup services with which the entity wishes to be linked That is, the entity must be able to find the lookup discovery service, and the lookup discovery service must be able to find the other desired lookup services To address these scenarios, the lookup discovery service participates in both the multicast discovery protocols and the unicast discovery protocol on behalf of a registered discovering entity or client This service will listen for and process multicast announcement packets from Jini lookup services and will, until successful, repeatedly attempt to discover specific lookup services that the client is interested in finding Upon discovery of a previously undiscovered lookup service of interest, the lookup discovery service notifies all entities that have requested the discovery of that lookup service that such an event has occurred The event mechanism employed by the lookup discovery service satisfies the requirements defined in The Jini Technology Core Platform Specification, "Distributed Events" Note that the entity that receives such an event notification does not have to be the client of the lookup discovery service; it may be a third party event handling service such as an event mailbox service Once a client is notified of the discovery of a lookup service, it is left to the client to define the semantics of how it interacts with that lookup service For example, the client may wish to join the lookup service, simply query it for other useful services, or both The lookup discovery service must be implemented as a well behaved Jini service and must comply with all of the policies embodied in the Jini technology programming model Thus, the resources granted by this service are leased, and implementations of this service must adhere to the distributed leasing model for Jini technology as defined in The Jini Technology Core Platform Specification, "Distributed Leasing" That is, the lookup discovery service will grant its services for only a limited period of time without an active expression of continuing interest on the part of the client LD11 Goals and Requirements The requirements of the interfaces and classes specified in this document are: To define a service that not only employs the Jini discovery protocols to discover, by way of either group association or LookupLocator association, lookup services in which clients have registered interest, but that also notifies its clients of the discovery of those lookup services To provide this service in such a way that it can be used by entities that deactivate To comply with the policies of the Jini technology programming model The goals of this document are as follows: To describe the lookup discovery service To provide guidance in the use and deployment of services that implement the LookupDiscoveryService interface and related classes and interfaces
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