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UNICAST and membership
======================
Author: Bela Ban
Date: Aug 10 2006
Sending a unicast message to P
------------------------------
- When sending the first unicast message to a member P, its seqno is 1 (meaning this is the first message)
- The message is added to the AckSenderWindow, which keeps resending the message until
it is acked by P, or P leaves the group (or crashes)
View change
-----------
When a member P leaves, the connection for P is removed from the connection table and added to previous_members
Receiving a unicast message from P
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- When receiving a message from P:
- If there is no entry for P in the connection table:
- If the message has seqno=1:
- Create a new entry for P in the connection table
- Add the message to the entry for P (AckReceiverWindow) and ack it back to P
- Else:
- Discard the message and do *not* ack it ! This is necessary, so P keeps retransmitting it !
- Else:
- Add the message to the entry for P (AckReceiverWindow) and ack it back to P
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