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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition The first form of the constructor is typically used by services that have not yet been assigned a service ID, but that have been pre configured to join lookup services that the service identifies through the initialization of a discovery manager The second form of the constructor takes the same arguments as the first, except that an instance of the ServiceID replaces an instance of the ServiceIDListener interface Note that the ServiceID class is defined in The Jini Technology Core Platform Specification, "Lookup Service", and the ServiceIDListener interface is described later The second form of the constructor applies the same semantics to the attrSets, discoveryMgr, and leaseMgr arguments as is applied by the first form of the constructor The second form of the constructor should be used by services that have already been assigned a service ID (possibly by the service provider or as a result of a prior registration with some lookup service), and that may or may not have been pre configured to join lookup services identified by group or by specific location The getDiscoveryManager method returns the instance of DiscoveryManagement that was either passed into the constructor by the entity or that was created as a result of null being passed as that parameter This method takes no arguments as input The object returned by this method encapsulates the mechanism by which either the JoinManager or the entity itself can set discovery listeners and discard previously discovered lookup services when they are found to be unavailable The getLeaseRenewalManager method returns an instance of the LeaseRenewalManager class This method takes no arguments as input The object returned by this method manages the leases requested and held by the JoinManager Although it may also manage leases unrelated to the join process that are requested and held by the service itself, the leases with which the JoinManager is concerned are the leases that correspond to the service registration requests the JoinManager has made with each lookup service the service wishes to join The getJoinSet method returns an array of ServiceRegistrar objects, each corresponding to a lookup service with which the service is currently registered (joined) If there are no lookup services with which the service is currently registered, this method returns the empty array This method takes no arguments as input and will return a new array upon each invocation The getAttributes method returns an array containing the set of attributes currently associated with the service If the service is not currently associated with an attribute set, this method returns the empty array This method takes no arguments as input and will return a new array upon each invocation Note that although a new array is returned by getAttributes, the elements of that array are not copies Thus, it important that the elements of the array returned by getAttributes not be modified; doing so could cause the state of the JoinManager to become corrupted or inconsistent This potential for corruption or inconsistency is why the effects of modifying the elements of the array returned by getAttributes are undefined The addAttributes method associates a new set of attributes with the service, in addition to the service's current set of attributes The association of this new set of attributes with the service will be propagated to each lookup service with which the service is registered This propagation must be performed asynchronously, so there is no guarantee that the propagation of the attributes to all lookup services with which the service is registered will have completed upon return from this method The set of attributes consisting of the union of the new set with the old set will be associated with the service in all future join processing
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