net.jini.lease

Class RenewalFailureEvent

java.lang.Object

java.util.EventObject

net.jini.core.event.RemoteEvent

net.jini.lease.RenewalFailureEvent

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

BasicRenewalFailureEvent

public abstract class RenewalFailureEvent
extends RemoteEvent

Event generated by a lease renewal set when it can't renew a lease it is responsible for.

RenewalFailureEvent is a subclass of RemoteEvent, adding two additional items of abstract state: the client lease that could not be renewed before expiration and the Throwable object that was thrown by the last renewal attempt (if any).

The methods of this interface are declared to allow implementations to defer the unmarshalling of the lease and Throwable until the client explicitly asks for them.

Author:

Sun Microsystems, Inc.

See Also:

LeaseRenewalSet, Serialized Form

Field Summary

Fields inherited from class net.jini.core.event.RemoteEvent

eventID, handback, seqNum, source

Constructor Summary

Constructors

Constructor and Description
RenewalFailureEvent(LeaseRenewalSet source, long seqNum, MarshalledObject handback) Simple constructor.

Method Summary

Modifier and Type	Method and Description
abstract Lease	getLease() Returns the lease that could not be renewed.
abstract Throwable	getThrowable() Returns the Throwable (if any) that was thrown by the last renewal attempt.

Methods inherited from class net.jini.core.event.RemoteEvent

getID, getRegistrationObject, getSequenceNumber

Methods inherited from class java.util.EventObject

getSource, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RenewalFailureEvent

public RenewalFailureEvent(LeaseRenewalSet source,
                           long seqNum,
                           MarshalledObject handback)

Simple constructor. Note event id is fixed to LeaseRenewalSet.RENEWAL_FAILURE_EVENT_ID.

Parameters:

source - the LeaseRenewalSet that generated the event

seqNum - the sequence number of this event

handback - the client handback

Method Detail

getLease

public abstract Lease getLease()
                        throws IOException,
                               ClassNotFoundException

Returns the lease that could not be renewed. This method may cause the lease to be unmarshalled. If it does and unmarshalling fails, future calls will attempt to re-unmarshal the lease. Once this method succeeds, subsequent calls must return the same object.

If the renewal service was able to renew the lease before the event occurred, the expiration time of the Lease object returned by this method will reflect the result of the last successful renewal call. This time may be distorted by clock skew between hosts if it is currently set to use the Lease.ABSOLUTE serial format. If the Lease object is using the Lease.DURATION serial format, and the implementation only unmarshals the lease when getLease is called, the expiration time may be distorted if a long time has passed between the time the event was generated by the renewal service and when the client called getLease. When a renewal failure event is generated for a given lease, that lease is removed from the set.

Returns:

the lease that could not be renewed

Throws:

IOException - if there are difficulties unmarshalling the lease, usually this will be some sort of class mismatch

ClassNotFoundException - if there are difficulties unmarshalling the lease, usually this will indicate one of the classes associated with the lease's implementation could not be loaded

getThrowable

public abstract Throwable getThrowable()
                                throws IOException,
                                       ClassNotFoundException

Returns the Throwable (if any) that was thrown by the last renewal attempt. If null is returned it can be assumed ether the last renewal attempt succeeded, or that the renewal service was unable to make a renewal attempt before the lease expired.

This method may cause the Throwable to be unmarshalled. If it does and unmarshalling fails, future calls will attempt to re-unmarshal the Throwable. Once this method succeeds, subsequent calls must return the same object.

Returns:

the Throwable (if any) that was thrown by the last renewal attempt

Throws:

IOException - if there are difficulties unmarshalling the Throwable, usually this will be some sort of class mismatch

ClassNotFoundException - if there are difficulties unmarshalling the Throwable, usually this will indicate one of the classes associated with the implementation of the Throwable could not be loaded