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Section: JU Jini Join Utilities Specification
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The JoinManager class depends on the interfaces DiscoveryManagement and ServiceIDListener discussed below JoinManager also references the concrete classes LookupDiscoveryManager and LeaseRenewalManager, each described in a separate specification JU51 The DiscoveryManagement Interface Although it is not necessary for the JoinManager itself to execute the discovery process, it does need to be notified when one of the lookup services it wishes to join is discovered or discarded Thus, at a minimum, the JoinManager requires access to the discovery events sent to the listeners registered with the discovery process' event mechanism The instance of DiscoveryManagement that is passed as an argument to the constructor of the JoinManager provides a mechanism for acquiring access to those events For a complete description of the semantics of the methods of this interface, refer to the Jini Discovery Utilities Specification One noteworthy item about the semantics of the JoinManager is the effect that invocations of the discard method of DiscoveryManagement will have on any discovery listeners created by the JoinManager The DiscoveryManagement interface specifies that the discard method will remove a particular lookup service from the managed set of lookup services that have already been discovered, allowing that lookup service to be rediscovered Invoking this method will result in the flushing of the lookup service from the appropriate cache, ultimately causing a discard notification to be sent to all DiscoveryListener objects registered with the event mechanism of the discovery process, including all listeners registered by the JoinManager The receipt of an event notification indicating that a lookup service has been discarded ultimately results in the removal (but not cancellation) of the registration lease granted by the discarded lookup service, and that is managed by the LeaseRenewalManager on behalf of the JoinManager After removal occurs, the lease will eventually expire JU52 The ServiceIDListener Interface The ServiceIDListener interface defines the methods used by a service to register a request for notification from the JoinManager upon the assignment of a serviceID by a lookup service It is the responsibility of the service to create and pass into the JoinManager an object that implements this interface That implementation must provide the definition of the actions to take upon receipt of the notification Typically, the action taken will be to persist the assigned serviceID reference
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package netjinilookup; public interface ServiceIDListener extends EventListener { public void serviceIDNotify(ServiceID serviceID); }
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The intent of this interface is to allow the entity to receive the ServiceID instance assigned to it by the lookup service It is not part of the semantics of the call that the return from the ServiceIDNotify method can be delayed while the recipient of the call processes the information delivered by the method Thus, it is highly recommended that implementations of this interface avoid time consuming operations, and return from the method as quickly as possible For example, one strategy might be to simply notify a separate thread, operating asynchronously, which is designed to JU5 Supporting Interfaces and Classes 221
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The Jini Service Discovery Utilities Specification defines discovery utilities that encapsulate functionality an entity can exploit to help in its search for, and acquisition of, services of interest In particular, the service discovery utilities provide mechanisms for caching discovered services, service discovery event management, filtering, and standard service lookup
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Section: SD Jini Service Discovery Utilities Specification
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This specification defines helper utility classes, along with supporting interfaces and classes, that encapsulate functionality that can help a Jini technology enabled service or client (Jini service or Jini client) in acquiring services of interest that are registered with the various lookup services with which the service or client wishes to interact Currently, the service discovery utilities specification defines only one helper utility class: The ServiceDiscoveryManager helper utility
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