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The constructor of the LeaseRenewalEvent class takes the following parameters as input: A reference to the instance of the LeaseRenewalManager that generated the event The lease associated with this event The desired expiration time of the lease The Throwable associated with the last renewal attempt (if any) The getLease method returns a reference to the Lease object associated with the event This method takes no arguments The getExpiration method returns a long value representing the desired expiration of the Lease object associated with the event This method takes no arguments The getException method returns the exception, if any, that is associated with the event This method takes no arguments If the LeaseRenewalEvent represents a desired expiration reached event this method will return null If the LeaseRenewalEvent represents a renewal failure event the getException method will return the exception that caused the event to be sent The conditions under which a renewal failure event may be sent, and the related values returned by this method, are as follows: When any lease in the managed set has passed its actual expiration time, and either the most recent renewal attempt was successful or there have been no renewal attempts, the LeaseRenewalManager will cease any further attempts to renew the lease, and will send a LeaseRenewalEvent with no associated exception In this case, invoking this method will return null For any lease from the managed set for which the most recent renewal attempt was unsuccessful because of the occurrence of a indefinite exception, the LeaseRenewalManager will continue to attempt to renew the affected lease at the appropriate times until: the renewal succeeds, the lease's actual expiration time has passed, or a renewal attempt throws a definite exception If a definite exception is thrown or the lease expires, the LeaseRenewalManager will cease any further attempts to renew the lease, and will send a LeaseRenewalEvent containing the exception associated with the last renewal attempt If, while attempting to renew a lease from the managed set, a definite exception is encountered, the LeaseRenewalManager will cease any further attempts to renew the lease, and will send a LeaseRenewalEvent containing the particular exception that occurred LM54 Serialized Forms
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LM5 Supporting Interfaces and Classes
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Section: Part 2: Specifications
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JU Jini Join Utilities Specification
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The Jini Join Utilities Specification The Jini join utilities encapsulate functionality that can help Jini services demonstrate good behavior in their discovery and registration related interactions with Jini lookup services In particular, the Jini join utilities perform functions related to lookup service discovery and registration (joining), as well as lease renewal and attribute management, which the Jini technology programming model requires of a well behaved Jini technology enabled service
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JU Jini Join Utilities Specification
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JU1 Introduction
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This specification defines helper utility classes, along with supporting interfaces and classes, that encapsulate functionality that can help Jini services demonstrate good behavior in their discovery and registration related interactions with Jini lookup services In particular, the Jini join utilities perform functions related to lookup service discovery and registration (joining), as well as lease renewal and attribute management, which the Jini technology programming model requires of a well behaved Jini technology enabled service Currently, this specification defines only one helper utility class: The JoinManager helper utility
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The goal of any well behaved Jini technology enabled service (Jini service), implemented within the bounds defined by the Jini technology programming model, is to advertise the service it provides by requesting residency within at least one Jini lookup service Making such a request of a Jini lookup service is known as registering with, or joining, a lookup service To demonstrate this good behavior, a service must comply with both the multicast discovery protocol and the unicast discovery protocol to discover the lookup services it is interested in joining The service must also comply with the join protocol to register with the desired lookup services The details of the discovery and join protocols are described in, The Jini Technology Core Platform Specification, "Discovery and Join" For the service to maintain its residency in the lookup services it has joined, the service must provide for the coordination, systematic renewal, and overall management of all leases on that residency In addition to handling all discovery and join duties, as well as managing all leases on lookup residency, the service must provide for the coordination and management of any attribute sets with which it may have registered With respect to the duties described above, a Jini service may perform all but the attribute set management duties by using the helper utility classes LookupDiscoveryManager and LeaseRenewalManager (For information on these classes, refer to The Jini Technology Core Platform Specification, "Discovery and Join" and Jini Lease Renewal Service Specification) Rather than writing a service to use these classes in a coordinated fashion (in addition to providing for attribute management), the service may be written to employ the JoinManager class from the netjinilookup package This utility class performs all of the functions related to discovery, joining, service lease renewal, and attribute management that the Jini technology programming model requires of a well behaved Jini service Each of these activities is intimately involved with the maintenance of a service's residency in one or more lookup services (the service's join state), hence the name JoinManager The JoinManager class provides an implementation of the functionality described above The use of this class in a wide variety of services can help mini mize the work resulting from having to repeatedly implement this required functionality in each service The JoinManager is a utility class, not a remote service Jini services that wish to use this utility will create an instance of the JoinManager in the service's address space to manage the entity's join state locally Note that when the term service is used, it refers to the object that has created an instance of the JoinManager and avails itself of the public methods of that utility class JU21 Other Types The types defined in the specification of the JoinManager utility class are in the netjinilookup package The following types may be referenced in this chapter Whenever referenced, these object types will be referenced in unqualified form:
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netjinicoreleaseLease netjinicoreentryEntry netjinicorelookupServiceID netjinicorelookupServiceRegistrar netjinicorelookupServiceRegistration netjinidiscoveryDiscoveryListener
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