Component lease management

A lease represents the right to perform some job for some period of time. Within a PolicyCenter application cluster, a lease specifically represents one of the following:

• A single run of a batch process
• An instance of a message destination
• An instance of a startable plugin, if it is a single instance plugin

Each server instance in the PolicyCenter cluster has a lease manager for each lease type. However, some functionality require a server with a specific server role. For example, only a server with the messaging role can acquire and manage a lease for a message destination.

Each type of lease manager can perform the following actions:

• Create, acquire, renew, or retire a lease
• Release a lease or request the release of a lease from another lease manager
• Transfer a lease to, or request the transfer of a lease from, another lease manager

Lease management contention

PolicyCenter lease management provides for minimal contention if two lease managers attempt to acquire the same lease at approximately the same time. Guidewire guarantees that only one server can acquire a specific lease. Guidewire also guarantees that, for an exclusive batch process, only a single such lease can exist at any one time.