EV2 The Basic Interfaces in Java

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EV2 The Basic Interfaces
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition There are interactions between the generation of sequence numbers for a RemoteEvent object and the ability to see events that occur within the scope of a transaction Those interactions are discussed in Section LEEV24 "Sequence Numbers" The common intent of a call to the notify method is to allow the recipient to find out that an occurrence of a kind of event has taken place The call to the notify method is synchronous to allow the party making the call to know whether the call succeeded However, it is not part of the semantics of the call that the notification return can be delayed while the recipient of the call reacts to the occurrence of the event Simply put, the best strategy on the part of the recipient is to note the occurrence in some way and then return from the notify method as quickly as possible
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EV233 The UnknownEventException
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The UnknownEventException is thrown when the recipient of a RemoteEvent does not recognize the combination of the event identified and the source of the event as something in which it is interested Throwing this exception has the effect of asking the sender to not send further notifications of this kind of event from this source in the future This exception is defined as:
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public class UnknownEventException extends Exception { public UnknownEventException() { super(); } public UnknownEventException(String reason){ super(reason); } }
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EV234 An Example EventGenerator Interface
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Registering interest in an event can take place in a number of ways, depending on how the event generator identifies its internal events There is no single way of identifying the events that are reasonable for all objects and all kinds of events, and so there is no single way of registering interest in events Because of this, there is no single interface for registration of interest However, the interaction between the event generator and the remote event listener does require that some initial information be passed from the registrant to the object that will make the call to its notify method The EventGenerator interface is an example of the kind of interface that could be used for registration of interest in events that can (logically) occur within an object This is a remote interface that contains one method:
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public interface EventGenerator extends Remote { public EventRegistration register(long evId, MarshalledObject handback, RemoteEventListener toInform, long leaseLength) throws UnknownEventException, RemoteException; }
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The one method, register, allows registration of interest in the occurrence of an event inside the object The method takes an evID that is used to identify the class of events, an object that is handed back as part of the notification, a reference to an RemoteEventListener object, and a long integer indicating the leasing period for the interest registration The evID is a long that is obtained by a means that is not specified here It may be returned by other interfaces or methods, or be defined by constants associated with the class or some interface implemented by the class If an evID is supplied to this call that is not recognized by the EventGenerator object, an UnknownEventException is thrown The use of a long to identify kinds of events is used only for illustrative purposes objects may identify events by any EV2 The Basic Interfaces 110
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition number of mechanisms, including identifiers, using separate methods to allow registration in different events, or allowing various sorts of pattern matching to determine what events are of interest The second argument of the register method is a MarshalledObject that is to be handed back as part of the notification generated when an event of the appropriate type occurs This object is known to the remote event listener and should contain any information that is needed by the listener to identify the event and to react to the occurrence of that event This object will be passed back as part of the event object that is passed as an argument to the notify method By passing a MarshalledObject into the register method, the re creation of the object is postponed until the object is needed The ability to pass a MarshalledObject as part of the event registration should be common to all event registration methods While there is no single method for identifying events in an object, the use of the pattern in which the remote event listener passes in an object that is passed back as part of the notification is central to the model of remote events presented here The third argument of the EventGenerator interface's register method is a RemoteEventListener implementation that is to receive event notifications The listener may be the object that is registering interest, or it may be some other RemoteEventListener, such as a third party event handler or notification "mailbox" The ability to specify some third party object to handle the notification is also central to this model of event notification, and the capability of specifying the recipient of the notification is also common to all event registration interfaces The final argument to the register method is a long indicating the requested duration of the registration This period is a request, and the period of interest actually granted by the event generator may be different The actual duration of the registration lease is returned as part of the Lease object included in the EventRegistration object The register method returns an EventRegistration object This object contains a long identifying the kind of event in which interest was registered (relative to the object granting the registration), a reference to the object granting the registration, and a Lease object
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