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The Jini Lookup Discovery Service Specification allows a third party to perform an entity's discovery duties For example, to conserve computational resources, an activatable entity may wish to deactivate; thus, such an entity may wish to employ a separate Jini helper service to perform its discovery duties while it is deactivated The lookup discovery service is a Jini helper service through which other Jini services and clients may request that discovery processing be performed on their behalf
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Part of The Jini Technology Core Platform Specification, "Discovery and Join" is devoted to defining the discovery requirements for well behaved Jini clients and services, called discovering entities, which are required to participate in the multicast discovery protocols Discovering entities are required to send multicast discovery requests to lookup services with which the entities wish to interact In addition, they must continuously listen for and act on announcements from the desired lookup services Interactions with a discovered lookup service may involve registration with that lookup service, or may simply involve querying the lookup service for services of interest (or both) To find specific lookup services, discovering entities also need to be able to participate in the unicast discovery protocol Under certain circumstances, a discovering entity may find it useful to allow a third party to perform the entity's discovery duties For example, an activatable entity that wishes to deactivate may wish to employ a special Jini technology enabled service (Jini service) referred to as a lookup discovery service to perform discovery duties on its behalf Such an entity may wish to deactivate for various reasons, one being to conserve computational resources While the entity is inactive, the lookup discovery service, running on the same or a separate host, would employ the discovery protocols to find lookup services in which the entity has expressed interest and would notify the entity when a previously unavailable lookup service has become available The facilities of the lookup discovery service are of particular value in a scenario in which a new lookup service is added to a long lived djinn containing mul tiple inactive services Without the use of a lookup discovery service, the time frame over which the new lookup service is fully populated can be both unpredictable and unbounded To understand why this time frame can be unpredictable, consider the fact that an inactive service has no way of discovering a new lookup service This means that each inactive service in the djinn that wishes to discover and join a new lookup service must first activate Since activation of a service occurs when some client attempts to use the service, the amount of time that passes between the arrival of the new lookup service and the activation of the service can vary greatly over the range of services in the djinn Thus, the time frame over which the lookup service becomes fully populated cannot be predicted because it could take arbitrarily long before all of the services activate and then discover and join the new lookup service In addition to being unpredictable, the time it takes for the lookup service to fully populate can also be unbounded This is because there is no guarantee that the lookup service will send multicast announcements between the time the service activates and the time it deactivates If the timing is right, it is possible that one or more of the services in the djinn may never discover and join the new lookup service Thus, without the use of the lookup discovery service, the new lookup service may never fully populate As another example of a discovering entity that may find it useful to allow a third party to perform the entity's discovery duties, consider an entity that exists in an environment with one of the following characteristics: The environment does not support multicast The environment contains no lookup services within the entity's multicast radius (roughly, the number of hops beyond which neither the multicast requests from the entity nor the multicast announcements from the lookup service will propagate) The environment does contain lookup service(s) within the entity's multicast radius, but at least one service needed by the entity is not registered with any lookup service within that radius
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