# Package org.apache.catalina.tribes.group

- Interface Summary
  Interface | Description
  --- | ---
  ExtendedRpcCallback | Extension to the `RpcCallback` interface.
  GroupChannelMBean |
  RpcCallback | The RpcCallback interface is an interface for the Tribes channel to request a response object to a request that came in.

- Class Summary
  Class | Description
  --- | ---
  AbsoluteOrder | Title: Membership - Absolute Order Description: A simple, yet agreeable and efficient way of ordering members Ordering members can serve as a basis for electing a leader or coordinating efforts.
  AbsoluteOrder.AbsoluteComparator |
  ChannelCoordinator | The channel coordinator object coordinates the membership service, the sender and the receiver.
  ChannelInterceptorBase | Abstract class for the interceptor base class.
  GroupChannel | The default implementation of a Channel.
  GroupChannel.HeartbeatThread | Title: Internal heartbeat thread Description: if `Channel.getHeartbeat()==true` then a thread of this class is created
  GroupChannel.InterceptorIterator | Title: Interceptor Iterator Description: An iterator to loop through the interceptors in a channel
  InterceptorPayload |
  Response | A response object holds a message from a responding partner.
  RpcChannel | A channel to handle RPC messaging
  RpcChannel.RpcCollector | Class that holds all response.
  RpcChannel.RpcCollectorKey |
  RpcMessage |
  RpcMessage.NoRpcChannelReply |

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