Relationships - Class Diagram MembershipManager send messagekeep track of membersfind and remove members JGroupsMessenger send and receive UDP messagesencapsulates jgroups JChannel jgroups stack with udp socket NetMember member metadataunique member idmember address - host, udp and tcp ports InternalDistributedMember additional member metadata NetView list of members MemberFactory Static factory Services Service GMSHealthMonitor check that members are alive and communicating. GMSJoinLeave Provides API to join and leave clusterreveives messages about joins/leaves from the network 11 Creates 1* 11