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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition
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javarmiNoSuchObjectException javarmiRemoteException netjinicoreeventRemoteEvent netjinicoreeventRemoteEventListener netjinicoreleaseLease netjinicoreleaseLeaseDeniedException
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition
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Section: EM Jini Event Mailbox Service Specification
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The EventMailbox defines the interface to the event mailbox service Through this interface, other Jini services and clients may request that event notification management be performed on their behalf This interface belongs to the netjinievent package, and any service implementing this interface must comply with the definition of a Jini service This interface is not a remote interface; each implementation exports a proxy object that implements this interface local to the client, using an implementation specific protocol to communicate with the actual remote server All of the proxy methods obey normal Java Remote Method Invocation (RMI) interface semantics and can therefore be implemented directly using RMI (except where explicitly noted) Two proxy objects are equal (using the equals method) if they are proxies for the same event mailbox service
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package netjinievent; public interface EventMailbox { MailboxRegistration register(long leaseDuration) throws RemoteException, LeaseDeniedException; }
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Event mailbox clients wishing to use the mailbox service first register themselves with the service using the register method Clients then use the methods of the returned MailboxRegistration object (a registration) in order to: Manage the lease for this particular registration Obtain a RemoteEventListener reference that can be registered with event generators (that is, objects that support event notification for changes in their abstract state) This listener will store any received notifications for this particular registration Enable or disable the delivery of any stored notifications for this particular registration
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Section: EM Jini Event Mailbox Service Specification
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To employ the event mailbox service, a client must first register with the event mailbox service by invoking the EventMailbox interface's only method, register Each invocation of the register method produces a new registration The register method may throw a RemoteException or a LeaseDeniedException Typically, a RemoteException occurs when there is a communication failure between the client and the event mailbox service If this exception does occur, the registration may or may not have been successful A LeaseDeniedException is thrown if the event mailbox service is unable or unwilling to grant the registration request It is implementation specific as to whether or not subsequent attempts (with or without the same argument) are likely to succeed Each registration with the event mailbox service is persistent across restarts or crashes of the event mailbox service, until the lease on the registration expires or is cancelled The register method takes a single parameter of type long that represents the requested initial lease duration for the registration, in milliseconds This duration value must be positive (except for the special value of LeaseANY) Otherwise, an IllegalArgumentException is thrown Every method invocation on an event mailbox service (whether the invocation is directly on the service, or indirectly on a MailboxRegistration that the service has created) is atomic with respect to other invocations
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Section: EM Jini Event Mailbox Service Specification
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The register method returns an object that implements the interface MailboxRegistration It is through this interface that the client controls its registration and notification management with the event mailbox service
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package netjinievent; public interface MailboxRegistration { Lease getLease(); RemoteEventListener getListener(); void enableDelivery(RemoteEventListener target) throws RemoteException; void disableDelivery() throws RemoteException; }
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The MailboxRegistration interface is not a remote interface Each implementation of the event mailbox service exports proxy objects that implement this interface local to the client These proxies use an implementation specific protocol to communicate with the remote server All of the remote proxy methods obey normal RMI interface semantics and can therefore be implemented using RMI Two proxy objects are equal (using the equals method) if they are proxies for the same registration, created by the same event mailbox service Each remote method of this interface may throw a RemoteException Typically, this exception occurs when there is a communication failure between the client and the event mailbox service Whenever a method invocation results in a RemoteException, the method may or may not have successfully completed Any invocation of a remote method defined in this interface will result in a NoSuchObjectException if the client's registration with the event mailbox service has expired or has been cancelled Note that upon receipt of a NoSuchObjectException, the client can assume that the registration no longer exists; the client cannot assume that the event mailbox service itself no longer exists EM41 The Semantics The getLease method returns the Lease object associated with the registration The client can renew or cancel the registration with the mailbox service through the Lease object returned by this method (see The Jini Technology Core Platform Specification, "Distributed Leasing") This method is not remote and takes no arguments The getListener method returns an object that implements the interface RemoteEventListener This object, referred to as a mailbox listener, can then be submitted as the RemoteEventListener argument to an event generator's registration method(s) (see The Jini Technology Core Platform Specification, "Distributed Events") Subsequent calls to this method will return equivalent objects (in the equals sense) Note that mailbox listeners generated by different registrations will not be equal This method is not remote and takes no arguments The valid period of use for a mailbox listener is tied to the associated registration's lease A NoSuchObjectException will be thrown if an attempt is made to invoke the notify method on a mailbox listener whose associated lease has terminated