synchronized void start() {
if (queue.closed()) queue.reset();
if (thread == null || !thread.isAlive()) {
thread = getThreadFactory().newThread(this, "ViewHandler");
thread.setDaemon(
false); // thread cannot terminate if we have tasks left, e.g. when we as coord leave
thread.start();
}
}
private void stopEventHandlerThread() {
if (evt_thread != null) {
event_queue.close(false);
event_queue = null;
evt_thread = null;
return;
}
if (event_queue != null) {
event_queue.close(false);
event_queue = null;
}
}
/**
* <b>Callback</b>. Called by superclass when event may be handled.
*
* <p><b>Do not use <code>PassUp</code> in this method as the event is passed up by default by the
* superclass after this method returns !</b>
*
* @return boolean Defaults to true. If false, event will not be passed up the stack.
*/
public boolean handleUpEvent(Event evt) {
switch (evt.getType()) {
case Event.CONNECT_OK: // sent by someone else, but WE are responsible for sending this !
case Event.DISCONNECT_OK: // dito (e.g. sent by UDP layer)
return false;
case Event.SET_LOCAL_ADDRESS:
local_addr = (Address) evt.getArg();
if (print_local_addr) {
System.out.println(
"\n-------------------------------------------------------\n"
+ "2.1GMS: address is "
+ local_addr
+ "\n-------------------------------------------------------");
}
return true; // pass up
case Event.SUSPECT:
try {
event_queue.add(evt);
} catch (Exception e) {
}
return true; // pass up
case Event.MERGE:
try {
event_queue.add(evt);
} catch (Exception e) {
}
return false; // don't pass up
case Event.FLUSH_OK:
synchronized (flush_mutex) {
flush_rsp = (FlushRsp) evt.getArg();
flush_mutex.notify();
}
return false; // don't pass up
case Event.REBROADCAST_MSGS_OK:
synchronized (rebroadcast_mutex) {
rebroadcast_mutex.notify();
}
return false; // don't pass up
}
return impl.handleUpEvent(evt);
}
public void run() {
Event evt;
while (evt_thread != null && event_queue != null) {
try {
evt = (Event) event_queue.remove();
switch (evt.getType()) {
case Event.SUSPECT:
impl.suspect((Address) evt.getArg());
break;
case Event.MERGE:
impl.merge((Vector) evt.getArg());
break;
default:
Trace.error(
"GMS.run()",
"event handler thread encountered event of type "
+ Event.type2String(evt.getType())
+ ": not handled by me !");
break;
}
} catch (QueueClosedException closed) {
break;
} catch (Exception ex) {
Trace.warn("GMS.run()", "exception=" + ex);
}
}
}
public String dumpQueue() {
StringBuilder sb = new StringBuilder();
List v = queue.values();
for (Iterator it = v.iterator(); it.hasNext(); ) {
sb.append(it.next() + "\n");
}
return sb.toString();
}
/**
* Waits until the current requests in the queue have been processed, then clears the queue and
* discards new requests from now on
*/
public synchronized void suspend() {
if (!suspended) {
suspended = true;
queue.clear();
waitUntilCompleted(MAX_COMPLETION_TIME);
queue.close(true);
resumer =
timer.schedule(
new Runnable() {
public void run() {
resume();
}
},
resume_task_timeout,
TimeUnit.MILLISECONDS);
}
}
/** Send a message to the address specified in dest */
void sendUdpMessage(Message msg) throws Exception {
IpAddress dest;
Message copy;
Event evt;
dest = (IpAddress) msg.getDest(); // guaranteed not to be null
setSourceAddress(msg);
if (Trace.debug) {
Trace.debug(
"UDP.sendUdpMessage()",
"sending message to "
+ msg.getDest()
+ " (src="
+ msg.getSrc()
+ "), headers are "
+ msg.getHeaders());
// Don't send if destination is local address. Instead, switch dst and src and put in
// up_queue.
// If multicast message, loopback a copy directly to us (but still multicast). Once we receive
// this,
// we will discard our own multicast message
}
if (loopback && (dest.equals(local_addr) || dest.isMulticastAddress())) {
copy = msg.copy();
copy.removeHeader(name);
copy.setSrc(local_addr);
copy.setDest(dest);
evt = new Event(Event.MSG, copy);
/* Because Protocol.up() is never called by this bottommost layer, we call up() directly in the observer.
This allows e.g. PerfObserver to get the time of reception of a message */
if (observer != null) {
observer.up(evt, up_queue.size());
}
if (Trace.debug) {
Trace.info("UDP.sendUdpMessage()", "looped back local message " + copy);
}
passUp(evt);
if (!dest.isMulticastAddress()) {
return;
}
}
if (use_outgoing_packet_handler) {
outgoing_queue.add(msg);
return;
}
send(msg);
}
synchronized void add(Request req) {
if (suspended) {
if (log.isTraceEnabled())
log.trace(local_addr + ": queue is suspended; request " + req + " is discarded");
return;
}
start();
try {
queue.add(req);
history.add(new Date() + ": " + req.toString());
} catch (QueueClosedException e) {
if (log.isTraceEnabled()) log.trace("queue is closed; request " + req + " is discarded");
}
}
public void run() {
long end_time, wait_time;
List<Request> requests = new LinkedList<Request>();
while (Thread.currentThread().equals(thread) && !suspended) {
try {
boolean keepGoing = false;
end_time = System.currentTimeMillis() + max_bundling_time;
do {
Request firstRequest =
(Request)
queue.remove(INTERVAL); // throws a TimeoutException if it runs into timeout
requests.add(firstRequest);
if (!view_bundling) break;
if (queue.size() > 0) {
Request nextReq = (Request) queue.peek();
keepGoing = view_bundling && firstRequest.canBeProcessedTogether(nextReq);
} else {
wait_time = end_time - System.currentTimeMillis();
if (wait_time > 0)
queue.waitUntilClosed(
wait_time); // misnomer: waits until element has been added or q closed
keepGoing =
queue.size() > 0 && firstRequest.canBeProcessedTogether((Request) queue.peek());
}
} while (keepGoing && System.currentTimeMillis() < end_time);
try {
process(requests);
} finally {
requests.clear();
}
} catch (QueueClosedException e) {
break;
} catch (TimeoutException e) {
break;
} catch (Throwable catchall) {
Util.sleep(50);
}
}
}
public void run() {
DatagramPacket packet;
byte receive_buf[] = new byte[65535];
int len;
byte[] tmp, data;
// moved out of loop to avoid excessive object creations (bela March 8 2001)
packet = new DatagramPacket(receive_buf, receive_buf.length);
while (mcast_receiver != null && mcast_sock != null) {
try {
packet.setData(receive_buf, 0, receive_buf.length);
mcast_sock.receive(packet);
len = packet.getLength();
data = packet.getData();
if (len == 1 && data[0] == 0) {
if (Trace.debug) {
Trace.info("UDP.run()", "received dummy packet");
}
continue;
}
if (len == 4) { // received a diagnostics probe
if (data[0] == 'd' && data[1] == 'i' && data[2] == 'a' && data[3] == 'g') {
handleDiagnosticProbe(packet.getAddress(), packet.getPort());
continue;
}
}
if (Trace.debug) {
Trace.info(
"UDP.receive()",
"received (mcast) "
+ packet.getLength()
+ " bytes from "
+ packet.getAddress()
+ ":"
+ packet.getPort()
+ " (size="
+ len
+ " bytes)");
}
if (len > receive_buf.length) {
Trace.error(
"UDP.run()",
"size of the received packet ("
+ len
+ ") is bigger than "
+ "allocated buffer ("
+ receive_buf.length
+ "): will not be able to handle packet. "
+ "Use the FRAG protocol and make its frag_size lower than "
+ receive_buf.length);
}
if (Version.compareTo(data) == false) {
Trace.warn(
"UDP.run()",
"packet from "
+ packet.getAddress()
+ ":"
+ packet.getPort()
+ " has different version ("
+ Version.printVersionId(data, Version.version_id.length)
+ ") from ours ("
+ Version.printVersionId(Version.version_id)
+ "). This may cause problems");
}
if (use_incoming_packet_handler) {
tmp = new byte[len];
System.arraycopy(data, 0, tmp, 0, len);
incoming_queue.add(tmp);
} else {
handleIncomingUdpPacket(data);
}
} catch (SocketException sock_ex) {
if (Trace.trace) {
Trace.info("UDP.run()", "multicast socket is closed, exception=" + sock_ex);
}
break;
} catch (InterruptedIOException io_ex) { // thread was interrupted
; // go back to top of loop, where we will terminate loop
} catch (Throwable ex) {
Trace.error("UDP.run()", "exception=" + ex + ", stack trace=" + Util.printStackTrace(ex));
Util.sleep(300); // so we don't get into 100% cpu spinning (should NEVER happen !)
}
}
if (Trace.trace) {
Trace.info("UDP.run()", "multicast thread terminated");
}
}
public int size() {
return queue.size();
}
public synchronized void resumeForce() {
if (queue.closed()) queue.reset();
suspended = false;
}
synchronized void stop(boolean flush) {
queue.close(flush);
if (resumer != null) resumer.cancel(false);
}
