/**
* We need to resend our first message with our conn_id
*
* @param sender
* @param seqno Resend the non null messages in the range [lowest .. seqno]
*/
protected void handleResendingOfFirstMessage(Address sender, long seqno) {
if (log.isTraceEnabled())
log.trace(local_addr + " <-- SEND_FIRST_SEQNO(" + sender + "," + seqno + ")");
SenderEntry entry = send_table.get(sender);
Table<Message> win = entry != null ? entry.sent_msgs : null;
if (win == null) {
if (log.isWarnEnabled())
log.warn(local_addr + ": sender window for " + sender + " not found");
return;
}
boolean first_sent = false;
for (long i = win.getLow() + 1; i <= seqno; i++) {
Message rsp = win.get(i);
if (rsp == null) continue;
if (first_sent) {
down_prot.down(new Event(Event.MSG, rsp));
} else {
first_sent = true;
// We need to copy the UnicastHeader and put it back into the message because Message.copy()
// doesn't copy
// the headers and therefore we'd modify the original message in the sender retransmission
// window
// (https://jira.jboss.org/jira/browse/JGRP-965)
Message copy = rsp.copy();
UnicastHeader hdr = (UnicastHeader) copy.getHeader(this.id);
UnicastHeader newhdr = hdr.copy();
newhdr.first = true;
copy.putHeader(this.id, newhdr);
down_prot.down(new Event(Event.MSG, copy));
}
}
}
protected void sendRequestForFirstSeqno(Address dest, long seqno_received) {
Message msg = new Message(dest).setFlag(Message.Flag.OOB, Message.Flag.INTERNAL);
UnicastHeader hdr = UnicastHeader.createSendFirstSeqnoHeader(seqno_received);
msg.putHeader(this.id, hdr);
if (log.isTraceEnabled())
log.trace(local_addr + " --> SEND_FIRST_SEQNO(" + dest + "," + seqno_received + ")");
down_prot.down(new Event(Event.MSG, msg));
}
protected void sendAck(Address dst, long seqno) {
if (!running) // if we are disconnected, then don't send any acks which throw exceptions on
// shutdown
return;
Message ack = new Message(dst);
ack.putHeader(this.id, UnicastHeader.createAckHeader(seqno));
if (log.isTraceEnabled())
log.trace(
new StringBuilder()
.append(local_addr)
.append(" --> ACK(")
.append(dst)
.append(": #")
.append(seqno)
.append(')'));
try {
down_prot.down(new Event(Event.MSG, ack));
num_acks_sent++;
} catch (Throwable t) {
log.error("failed sending ACK(" + seqno + ") to " + dst, t);
}
}
public Object down(Event evt) {
switch (evt.getType()) {
case Event.MSG: // Add UnicastHeader, add to AckSenderWindow and pass down
Message msg = (Message) evt.getArg();
Address dst = msg.getDest();
/* only handle unicast messages */
if (dst == null || msg.isFlagSet(Message.Flag.NO_RELIABILITY)) break;
if (!running) {
if (log.isTraceEnabled())
log.trace("discarded message as start() has not yet been called, message: " + msg);
return null;
}
SenderEntry entry = send_table.get(dst);
if (entry == null) {
entry = new SenderEntry(getNewConnectionId());
SenderEntry existing = send_table.putIfAbsent(dst, entry);
if (existing != null) entry = existing;
else {
if (log.isTraceEnabled())
log.trace(
local_addr
+ ": created sender window for "
+ dst
+ " (conn-id="
+ entry.send_conn_id
+ ")");
if (cache != null && !members.contains(dst)) cache.add(dst);
}
}
short send_conn_id = entry.send_conn_id;
long seqno = entry.sent_msgs_seqno.getAndIncrement();
long sleep = 10;
do {
try {
msg.putHeader(
this.id,
UnicastHeader.createDataHeader(seqno, send_conn_id, seqno == DEFAULT_FIRST_SEQNO));
entry.sent_msgs.add(seqno, msg); // add *including* UnicastHeader, adds to retransmitter
if (conn_expiry_timeout > 0) entry.update();
break;
} catch (Throwable t) {
if (!running) break;
Util.sleep(sleep);
sleep = Math.min(5000, sleep * 2);
}
} while (running);
if (log.isTraceEnabled()) {
StringBuilder sb = new StringBuilder();
sb.append(local_addr)
.append(" --> DATA(")
.append(dst)
.append(": #")
.append(seqno)
.append(", conn_id=")
.append(send_conn_id);
if (seqno == DEFAULT_FIRST_SEQNO) sb.append(", first");
sb.append(')');
log.trace(sb);
}
num_msgs_sent++;
return down_prot.down(evt);
case Event.VIEW_CHANGE: // remove connections to peers that are not members anymore !
View view = (View) evt.getArg();
List<Address> new_members = view.getMembers();
Set<Address> non_members = new HashSet<Address>(send_table.keySet());
non_members.addAll(recv_table.keySet());
members = new_members;
non_members.removeAll(new_members);
if (cache != null) cache.removeAll(new_members);
if (!non_members.isEmpty()) {
if (log.isTraceEnabled()) log.trace("removing non members " + non_members);
for (Address non_mbr : non_members) removeConnection(non_mbr);
}
break;
case Event.SET_LOCAL_ADDRESS:
local_addr = (Address) evt.getArg();
break;
}
return down_prot.down(evt); // Pass on to the layer below us
}
