EV235 The EventRegistration Class in Java

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EV235 The EventRegistration Class
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Objects of the class EventRegistration are meant to encapsulate the information the client needs to identify a notification as a response to a registration request and to maintain that registration request It is not necessary for a method that allows event interest registration to return an EventRegistration object However, the class does show the kind of information that needs to be returned in the event model The public parts of this class look like
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public class EventRegistration implements javaioSerializable { public EventRegistration(long eventID, Object eventSource, Lease eventLease, long seqNum) {} public long getID() {} public Object getSource() {} public Lease getLease() {} public long getSequenceNumber() {} }
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The getID method returns the identifier of the event in which interest was registered This, combined with the return value returned by getSource, will uniquely identify the kind of event This information is needed to hand off to third party repositories to allow them to recognize the event and route it correctly if they are to receive notifications of those events The result of the EventRegistrationgetID method should be the same as the result of the RemoteEventgetID method, and the result of the EventRegistrationgetSource method EV2 The Basic Interfaces 111
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition should be the same as the RemoteEventgetSource method The getSource method returns a reference to the event generator, which is used in combination with the result of the getID method to uniquely identify an event The getLease returns the Lease object for this registration It is used in lease maintenance The getSequenceNumber method returns the value of the sequence number on the event kind that was current when the registration was granted, allowing comparison with the sequence number in any subsequent notifications EV24 Sequence Numbers, Leasing and Transactions There are cases in which event registrations are allowed within the scope of a transaction, in such a way that the notifications of these events can occur within the scope of the transaction This means that other participants in the transaction may see some events whose visibility is hidden by the transaction from entities outside of the transaction This has an effect on the generation of sequence numbers and the duration of an event registration lease An event registration that occurs within a transaction is considered to be scoped by that transaction This means that any occurrence of the kind of event of interest that happens as part of the transaction will cause a notification to be sent to the recipients indicated by the registration that occurred in the transaction Such events must have a separate event identification number (the long returned in the RemoteEvent getID method) to allow third party store and forward entities to distinguish between an event that happens within a transaction and those that happen outside of the transaction Notifications of these events will not be sent to entities that registered interest in this kind of event outside the scope of the transaction until and unless the transaction is committed Because of this isolation requirement of transactions, notifications sent from inside a transaction will have a different sequence number than the notifications of the same events would have outside of the transaction Within a transaction, all RemoteEvent objects for a given kind of event are given a sequence number relative to the transaction, even if the event that triggered the RemoteEvent occurs outside of the scope of the transaction (but is visible within the transaction) One counter intuitive effect of this is that an object could register for notification of some event E both outside a transaction and within a transaction, and receive two distinct RemoteEvent objects with different sequence numbers for the same event One of the RemoteEvent objects would contain the event with a sequence number relative to the transaction, while the other would contain the event with a sequence number relative to the source object The other effect of transactions on event registrations is to limit the duration of a lease A registration of interest in some kind of event that occurs within the scope of a transaction should be leased in the same way as other event interest registrations However, the duration of the registration is the minimum of the length of the lease and the duration of the transaction Simply put, when the transaction ends (either because of a commit or a rollback), the interest registration also ends This is true even if the lease for the event registration has not expired and no call has been made to cancel the lease It is still reasonable to lease event interest registrations, even in the scope of a transaction, because the requested lease may be shorter than the transaction in question However, no such interest registration will survive the transaction in which it occurs EV25 Serialized Forms
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