# Package org.apache.catalina.ha.session

Interface Summary
ReplicatedSessionListener: This is a marker interface used to indicate an implementation of `SessionListener` that should be replicated with the session across the cluster.
SessionMessage: The SessionMessage interface is used when a session has been created, modified, expired in a Tomcat cluster node.

Class Summary
BackupManager
ClusterManagerBase
ClusterSessionListener: Receive replicated SessionMessage form other cluster node.
DeltaManager: The DeltaManager manages replicated sessions by only replicating the deltas in data.
DeltaRequest: This class is used to track the series of actions that happens when a request is executed.
DeltaSession: Similar to the StandardSession except that this session will keep track of deltas during a request.
JvmRouteBinderValve: Valve to handle Tomcat jvmRoute takeover using mod_jk module after node failure.
SessionMessageImpl: Session cluster message