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10.4. Shipped Eviction Policies

This section details the different algorithms shipped with JBoss Cache, and the various configuration parameters used for each algorithm.

10.4.1. LRUAlgorithm - Least Recently Used
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org.jboss.cache.eviction.LRUAlgorithm controls both the node lifetime and age. This policy guarantees a constant order ( O (1) ) for adds, removals and lookups (visits). It has the following configuration parameters:
  • maxNodes - This is the maximum number of nodes allowed in this region. 0 denotes immediate expiry, -1 denotes no limit.
  • timeToLive - The amount of time a node is not written to or read (in milliseconds) before the node is swept away. 0 denotes immediate expiry, -1 denotes no limit.
  • maxAge - Lifespan of a node (in milliseconds) regardless of idle time before the node is swept away. 0 denotes immediate expiry, -1 denotes no limit.
  • minTimeToLive - the minimum amount of time a node must be allowed to live after being accessed before it is allowed to be considered for eviction. 0 denotes that this feature is disabled, which is the default value.
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