public void init()
{
nak = new NakReceiverWindow(remoteAddr,this,0);
nak.setRetransmitTimeouts(retransmit_timeout);
}
/// <remarks>
/// For all members of the digest, adjust the NakReceiverWindows in the received_msgs hashtable.
/// If the member already exists, sets its seqno to be the max of the seqno and the seqno of the member
/// in the digest. If no entry exists, create one with the initial seqno set to the seqno of the
/// member in the digest.
/// </remarks>
/// <summary>
/// Merges two digests together
/// </summary>
/// <param name="d">Digest to merge</param>
void mergeDigest(Digest d)
{
Address sender;
NakReceiverWindow win;
long initial_seqno;
if(d == null || d.senders == null)
{
if(Trace.trace)
Trace.error("NAKACK.mergeDigest()", "digest or digest.senders is null");
return;
}
for(int i=0; i < d.size(); i++)
{
sender=d.senderAt(i);
if(sender == null)
{
if(Trace.trace)
Trace.error("NAKACK.mergeDigest()", "sender at index " + i + " in digest is null");
continue;
}
initial_seqno=d.highSeqnoAt(i);
win=(NakReceiverWindow)received_msgs[sender];
if(win == null)
{
win=new NakReceiverWindow(sender, this, initial_seqno, timer);
win.setRetransmitTimeouts(retransmit_timeout);
received_msgs.Add(sender, win);
}
else
{
if(win.getHighestReceived() < initial_seqno)
{
win.reset();
received_msgs.Remove(sender);
win=new NakReceiverWindow(sender, this, initial_seqno, timer);
win.setRetransmitTimeouts(retransmit_timeout);
received_msgs.Add(sender, win);
}
}
}
}
/// <summary>
/// Installs new NakReceiverWindows with the values specified in the Digest.
/// </summary>
/// <param name="d"></param>
void setDigest(Digest d)
{
Address sender;
NakReceiverWindow win;
long initial_seqno;
clear();
if(d == null || d.senders == null)
{
if(Trace.trace)
Trace.error("NAKACK.setDigest()", "digest or digest.senders is null");
return;
}
for(int i=0; i < d.size(); i++)
{
sender=d.senderAt(i);
if(sender == null)
{
if(Trace.trace)
Trace.error("NAKACK.setDigest()", "sender at index " + i + " in digest is null");
continue;
}
initial_seqno=d.highSeqnoAt(i);
win=new NakReceiverWindow(sender, this, initial_seqno, timer);
win.setRetransmitTimeouts(retransmit_timeout);
received_msgs.Add(sender, win);
}
}
/// <summary>
/// Removes all old members and creates NakReceiverWindows for all new members
/// </summary>
void adjustReceivers()
{
Address newSender;
NakReceiverWindow win;
Hashtable oldSenders = new Hashtable();
// 1. Remove all senders in received_msgs that are not members anymore
foreach(Address sender in received_msgs.Keys)
{
if(!members.Contains(sender))
{
oldSenders.Add(sender, received_msgs[sender]);
}
}
foreach(Address sender in oldSenders.Keys)
{
win=(NakReceiverWindow)received_msgs[sender];
win.reset();
if(Trace.trace)
Trace.info("NAKACK.adjustReceivers()", "removing " + sender +
" from received_msgs (not member anymore)");
received_msgs.Remove(sender);
}
// 2. Add newly joined members to received_msgs (starting seqno=0)
for(int i=0; i < members.Count; i++)
{
newSender=(Address)members[i];
if(!received_msgs.ContainsKey(newSender))
{
win = new NakReceiverWindow(newSender, this, 0, timer);
win.setRetransmitTimeouts(retransmit_timeout);
received_msgs.Add(newSender, win);
}
}
}