These are distributed leasing interfaces and classes. A `Lease` represents an agreement between lease holder and lease grantor over how long the grantor will keep a resource available. The grantor pledges to keep the resource available for at least as long as the remaining time of the lease. The holder typically requests a lease for a given time frame, and the grantor returns a `Lease` object that represents the pledge it is actually willing to make (which may be different from the requested time). The grantor may allow the holder to renew the lease, thereby extending the pledge to a later time. @see "Jini(TM) Distributed Leasing Specification"