com.sun.jini.reggie

Class EventLease

java.lang.Object

com.sun.jini.lease.AbstractLease

com.sun.jini.reggie.EventLease

All Implemented Interfaces:

Serializable, Lease, ReferentUuid

Direct Known Subclasses:

ConstrainableEventLease

public class EventLease
extends AbstractLease

When a registrar (lookup service) grants a lease on an event registration on behalf of some object (client), a proxy is employed to allow the client to interact with the lease; this class is the implementation of that proxy. Clients only see instances of this class via the Lease interface.

Author:

Sun Microsystems, Inc.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.sun.jini.lease.AbstractLease

expiration, serialFormat

Fields inherited from interface net.jini.core.lease.Lease

ABSOLUTE, ANY, DURATION, FOREVER

Method Summary

Modifier and Type	Method and Description
boolean	canBatch(Lease lease) Two leases can be batched if they are both RegistrarLeases and have the same server.
void	cancel() Used by the lease holder to indicate that it is no longer interested in the resource or information held by the lease.
LeaseMap	createLeaseMap(long duration) Creates a lease map.
protected long	doRenew(long duration) Renews the event lease associated with an instance of this class.
boolean	equals(Object obj) Returns true if lease Uuids match, false otherwise.
Uuid	getReferentUuid() Returns the lease Uuid.
int	hashCode() Returns the lease Uuid's hash code.
String	toString() Returns a string created from the proxy class name, the registrar's service ID, the id of the lessee or event (depending on the subclass), and the result of the underlying server proxy's toString method.

Methods inherited from class com.sun.jini.lease.AbstractLease

getExpiration, getSerialFormat, renew, setSerialFormat

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

cancel

public void cancel()
            throws UnknownLeaseException,
                   RemoteException

Description copied from interface: Lease

Used by the lease holder to indicate that it is no longer interested in the resource or information held by the lease. If the leased information or resource could cause a callback to the lease holder (or some other object on behalf of the lease holder), the lease grantor should not issue such a callback after the lease has been cancelled. The overall effect of a cancel call is the same as lease expiration, but instead of happening at the end of a pre-agreed duration it happens immediately.

Throws:

UnknownLeaseException - the lease being cancelled is unknown to the lease grantor

RemoteException

doRenew

protected long doRenew(long duration)
                throws UnknownLeaseException,
                       RemoteException

Renews the event lease associated with an instance of this class. Each instance of this class corresponds to a lease on an event registration for a particular client. This method renews that lease on behalf of the client.

Specified by:

doRenew in class AbstractLease

Parameters:

duration - the requested duration for the lease being renewed

Returns:

long value representing the new duration that was granted for the renewed lease. Note that the duration returned may be less than the duration requested.

Throws:

UnknownLeaseException - indicates the lease does not exist; typically because the lease has expired.

RemoteException

createLeaseMap

public LeaseMap createLeaseMap(long duration)

Creates a lease map.

Specified by:

createLeaseMap in interface Lease

Parameters:

duration - the duration to put into a Long and use as the value for the current lease in the created LeaseMap

Returns:

the created LeaseMap object

canBatch

public boolean canBatch(Lease lease)

Two leases can be batched if they are both RegistrarLeases and have the same server.

Specified by:

canBatch in interface Lease

Parameters:

lease - the Lease to be evaluated

Returns:

a boolean indicating whether or not the lease given as a parameter can be batched (placed in the same LeaseMap) with the current lease

getReferentUuid

public Uuid getReferentUuid()

Returns the lease Uuid.

Specified by:

getReferentUuid in interface ReferentUuid

Returns:

the Uuid associated with the resource this proxy represents. Will not return null.

hashCode

public int hashCode()

Returns the lease Uuid's hash code.

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Returns true if lease Uuids match, false otherwise.

Overrides:

equals in class Object

toString

public String toString()

Returns a string created from the proxy class name, the registrar's service ID, the id of the lessee or event (depending on the subclass), and the result of the underlying server proxy's toString method.

Overrides:

toString in class Object

Returns:

String