/** Execute when new member join or leave Group */
public void viewAccepted(View v) {
memberSize = v.size();
if (mainFrame != null) setTitle();
members.clear();
members.addAll(v.getMembers());
if (v instanceof MergeView) {
System.out.println("** " + v);
// This is a simple merge function, which fetches the state from the coordinator
// on a merge and overwrites all of its own state
if (useState && !members.isEmpty()) {
Address coord = members.get(0);
Address local_addr = channel.getAddress();
if (local_addr != null && !local_addr.equals(coord)) {
try {
// make a copy of our state first
Map<Point, Color> copy = null;
if (send_own_state_on_merge) {
synchronized (drawPanel.state) {
copy = new LinkedHashMap<Point, Color>(drawPanel.state);
}
}
System.out.println("fetching state from " + coord);
channel.getState(coord, 5000);
if (copy != null)
sendOwnState(copy); // multicast my own state so everybody else has it too
} catch (Exception e) {
e.printStackTrace();
}
}
}
} else System.out.println("** View=" + v);
}
protected boolean _startFlush(
final View new_view, int maxAttempts, long randomFloor, long randomCeiling) {
if (!flushProtocolInStack) return true;
if (flushInvokerClass != null) {
try {
Callable<Boolean> invoker =
flushInvokerClass.getDeclaredConstructor(View.class).newInstance(new_view);
return invoker.call();
} catch (Throwable e) {
return false;
}
}
try {
boolean successfulFlush = false;
boolean validView = new_view != null && new_view.size() > 0;
if (validView && flushProtocolInStack) {
int attemptCount = 0;
while (attemptCount < maxAttempts) {
try {
up_prot.up(new Event(Event.SUSPEND, new ArrayList<Address>(new_view.getMembers())));
successfulFlush = true;
break;
} catch (Exception e) {
Util.sleepRandom(randomFloor, randomCeiling);
attemptCount++;
}
}
if (successfulFlush) {
if (log.isTraceEnabled()) log.trace(local_addr + ": successful GMS flush by coordinator");
} else {
if (log.isWarnEnabled()) log.warn(local_addr + ": GMS flush by coordinator failed");
}
}
return successfulFlush;
} catch (Exception e) {
return false;
}
}
/**
* Broadcasts the new view and digest, and waits for acks from all members in the list given as
* argument. If the list is null, we take the members who are part of new_view
*/
public void castViewChange(
View new_view, Digest digest, JoinRsp jr, Collection<Address> newMembers) {
if (log.isTraceEnabled())
log.trace(local_addr + ": mcasting view " + new_view + " (" + new_view.size() + " mbrs)\n");
// Send down a local TMP_VIEW event. This is needed by certain layers (e.g. NAKACK) to compute
// correct digest
// in case client's next request (e.g. getState()) reaches us *before* our own view change
// multicast.
// Check NAKACK's TMP_VIEW handling for details
down_prot.up(new Event(Event.TMP_VIEW, new_view));
down_prot.down(new Event(Event.TMP_VIEW, new_view));
List<Address> ackMembers = new ArrayList<Address>(new_view.getMembers());
if (newMembers != null && !newMembers.isEmpty()) ackMembers.removeAll(newMembers);
Message view_change_msg = new Message(); // bcast to all members
GmsHeader hdr = new GmsHeader(GmsHeader.VIEW, new_view);
hdr.my_digest = digest;
view_change_msg.putHeader(this.id, hdr);
// If we're the only member the VIEW is broadcast to, let's simply install the view directly,
// without
// sending the VIEW multicast ! Or else N-1 members drop the multicast anyway...
if (local_addr != null && ackMembers.size() == 1 && ackMembers.get(0).equals(local_addr)) {
// we need to add the message to the retransmit window (e.g. in NAKACK), so (1) it can be
// retransmitted and
// (2) we increment the seqno (otherwise, we'd return an incorrect digest)
down_prot.down(new Event(Event.ADD_TO_XMIT_TABLE, view_change_msg));
impl.handleViewChange(new_view, digest);
} else {
if (!ackMembers.isEmpty()) ack_collector.reset(ackMembers);
down_prot.down(new Event(Event.MSG, view_change_msg));
try {
if (!ackMembers.isEmpty()) {
ack_collector.waitForAllAcks(view_ack_collection_timeout);
if (log.isTraceEnabled())
log.trace(
local_addr
+ ": received all "
+ ack_collector.expectedAcks()
+ " ACKs from members for view "
+ new_view.getVid());
}
} catch (TimeoutException e) {
if (log_collect_msgs && log.isWarnEnabled()) {
log.warn(
local_addr
+ ": failed to collect all ACKs (expected="
+ ack_collector.expectedAcks()
+ ") for view "
+ new_view.getViewId()
+ " after "
+ view_ack_collection_timeout
+ "ms, missing ACKs from "
+ ack_collector.printMissing());
}
}
}
if (jr != null && (newMembers != null && !newMembers.isEmpty())) {
ack_collector.reset(new ArrayList<Address>(newMembers));
for (Address joiner : newMembers) {
sendJoinResponse(jr, joiner);
}
try {
ack_collector.waitForAllAcks(view_ack_collection_timeout);
if (log.isTraceEnabled())
log.trace(
local_addr
+ ": received all ACKs ("
+ ack_collector.expectedAcks()
+ ") from joiners for view "
+ new_view.getVid());
} catch (TimeoutException e) {
if (log_collect_msgs && log.isWarnEnabled()) {
log.warn(
local_addr
+ ": failed to collect all ACKs (expected="
+ ack_collector.expectedAcks()
+ ") for unicast view "
+ new_view
+ " after "
+ view_ack_collection_timeout
+ "ms, missing ACKs from "
+ ack_collector.printMissing());
}
}
}
}