protected void deliver(Message msg, Event evt, SequencerHeader hdr) {
Address sender = msg.getSrc();
if (sender == null) {
if (log.isErrorEnabled())
log.error(local_addr + ": sender is null, cannot deliver " + "::" + hdr.getSeqno());
return;
}
long msg_seqno = hdr.getSeqno();
if (sender.equals(local_addr)) {
forward_table.remove(msg_seqno);
if (hdr.flush_ack) {
ack_promise.setResult(msg_seqno);
if (ack_mode && !flushing && threshold > 0 && ++num_acks >= threshold) {
ack_mode = false;
num_acks = 0;
}
}
}
if (!canDeliver(sender, msg_seqno)) {
if (log.isWarnEnabled())
log.warn(local_addr + ": dropped duplicate message " + sender + "::" + msg_seqno);
return;
}
if (log.isTraceEnabled()) log.trace(local_addr + ": delivering " + sender + "::" + msg_seqno);
up_prot.up(evt);
delivered_bcasts++;
}
protected void unblockAll() {
flushing = false;
send_lock.lock();
try {
send_cond.signalAll();
ack_promise.setResult(null);
} finally {
send_lock.unlock();
}
}
protected void stopFlusher() {
flushing = false;
Thread tmp = flusher;
while (tmp != null && tmp.isAlive()) {
tmp.interrupt();
ack_promise.setResult(null);
try {
tmp.join();
} catch (InterruptedException e) {
}
}
}
public void sendDiscoveryRequest(String cluster_name, Promise promise, ViewId view_id)
throws Exception {
PingData data = null;
PhysicalAddress physical_addr =
(PhysicalAddress) down(new Event(Event.GET_PHYSICAL_ADDRESS, local_addr));
if (view_id == null) {
List<PhysicalAddress> physical_addrs = Arrays.asList(physical_addr);
data = new PingData(local_addr, null, false, UUID.get(local_addr), physical_addrs);
}
PingHeader hdr = new PingHeader(PingHeader.GET_MBRS_REQ, data, cluster_name);
hdr.view_id = view_id;
Collection<PhysicalAddress> cluster_members = fetchClusterMembers(cluster_name);
if (cluster_members == null) {
Message msg = new Message(null); // multicast msg
msg.setFlag(Message.OOB);
msg.putHeader(getId(), hdr);
sendMcastDiscoveryRequest(msg);
} else {
if (cluster_members.isEmpty()) { // if we don't find any members, return immediately
if (promise != null) promise.setResult(null);
} else {
for (final Address addr : cluster_members) {
if (addr.equals(physical_addr)) // no need to send the request to myself
continue;
final Message msg = new Message(addr, null, null);
msg.setFlag(Message.OOB);
msg.putHeader(this.id, hdr);
if (log.isTraceEnabled())
log.trace("[FIND_INITIAL_MBRS] sending discovery request to " + msg.getDest());
if (!sendDiscoveryRequestsInParallel()) {
down_prot.down(new Event(Event.MSG, msg));
} else {
timer.execute(
new Runnable() {
public void run() {
try {
down_prot.down(new Event(Event.MSG, msg));
} catch (Exception ex) {
if (log.isErrorEnabled())
log.error("failed sending discovery request to " + addr + ": " + ex);
}
}
});
}
}
}
}
}
/**
* Callback method <br>
* Called by the ProtocolStack when a message is received.
*
* @param evt the event carrying the message from the protocol stack
*/
public Object up(Event evt) {
switch (evt.getType()) {
case Event.MSG:
Message msg = (Message) evt.getArg();
if (stats) {
received_msgs++;
received_bytes += msg.getLength();
}
// discard local messages (sent by myself to me)
if (discard_own_messages
&& local_addr != null
&& msg.getSrc() != null
&& local_addr.equals(msg.getSrc())) return null;
break;
case Event.VIEW_CHANGE:
View tmp = (View) evt.getArg();
if (tmp instanceof MergeView) my_view = new View(tmp.getViewId(), tmp.getMembers());
else my_view = tmp;
// Bela&Vladimir Oct 27th,2006 (JGroups 2.4): we need to set connected=true because a client
// can
// call channel.getView() in viewAccepted() callback invoked on this thread (see
// Event.VIEW_CHANGE handling below)
// not good: we are only connected when we returned from connect() - bela June 22 2007
// Changed: when a channel gets a view of which it is a member then it should be
// connected even if connect() hasn't returned yet ! (bela Noc 2010)
if (state != State.CONNECTED) state = State.CONNECTED;
break;
case Event.CONFIG:
Map<String, Object> cfg = (Map<String, Object>) evt.getArg();
if (cfg != null) {
if (cfg.containsKey("state_transfer")) {
state_transfer_supported = (Boolean) cfg.get("state_transfer");
}
if (cfg.containsKey("flush_supported")) {
flush_supported = (Boolean) cfg.get("flush_supported");
}
}
break;
case Event.GET_STATE_OK:
StateTransferResult result = (StateTransferResult) evt.getArg();
if (up_handler != null) {
try {
Object retval = up_handler.up(evt);
state_promise.setResult(new StateTransferResult());
return retval;
} catch (Throwable t) {
state_promise.setResult(new StateTransferResult(t));
}
}
if (receiver != null) {
try {
if (result.hasBuffer()) {
byte[] tmp_state = result.getBuffer();
ByteArrayInputStream input = new ByteArrayInputStream(tmp_state);
receiver.setState(input);
}
state_promise.setResult(result);
} catch (Throwable t) {
state_promise.setResult(new StateTransferResult(t));
}
}
break;
case Event.STATE_TRANSFER_INPUTSTREAM_CLOSED:
state_promise.setResult((StateTransferResult) evt.getArg());
break;
case Event.STATE_TRANSFER_INPUTSTREAM:
// Oct 13,2006 moved to down() when Event.STATE_TRANSFER_INPUTSTREAM_CLOSED is received
// state_promise.setResult(is != null? Boolean.TRUE : Boolean.FALSE);
if (up_handler != null) return up_handler.up(evt);
InputStream is = (InputStream) evt.getArg();
if (is != null && receiver != null) {
try {
receiver.setState(is);
} catch (Throwable t) {
throw new RuntimeException("failed calling setState() in state requester", t);
}
}
break;
case Event.STATE_TRANSFER_OUTPUTSTREAM:
if (receiver != null && evt.getArg() != null) {
try {
receiver.getState((OutputStream) evt.getArg());
} catch (Exception e) {
throw new RuntimeException("failed calling getState() in state provider", e);
}
}
break;
case Event.GET_LOCAL_ADDRESS:
return local_addr;
default:
break;
}
// If UpHandler is installed, pass all events to it and return (UpHandler is e.g. a building
// block)
if (up_handler != null) return up_handler.up(evt);
if (receiver != null) return invokeCallback(evt.getType(), evt.getArg());
return null;
}
