This package contains code for Clustering, the base class of a Cluster is `org.apache.catalina.Cluster` implementations of this class is done when implementing a new Cluster protocol

The only Cluster protocol currently implemented is a MulticastProtocol
StandardCluster.java

In addition to the `Cluster` implementation `StandardCluster` there's a listener and a sender implemented using multicasting.

- MulticastSender - A `ClusterSender` implementation that works with a MulticastSocket
- MulticastReceiver - A `ClusterReceiver` implementation that works with a MulticastSocket

Both extend the common class `ClusterSessionBase` which provides common functionality shared by the two implementations.