void start() {
if (t == null) {
t = new Thread(this, "UDP.OutgoingPacketHandler thread");
t.setDaemon(true);
t.start();
}
}
/**
* @param views Guaranteed to be non-null and to have >= 2 members, or else this thread would
* not be started
*/
public synchronized void start(Map<Address, View> views) {
if (thread == null || thread.isAlive()) {
this.coords.clear();
// now remove all members which don't have us in their view, so RPCs won't block (e.g.
// FLUSH)
// https://jira.jboss.org/browse/JGRP-1061
sanitizeViews(views);
// Add all different coordinators of the views into the hashmap and sets their members:
Collection<Address> coordinators = Util.determineMergeCoords(views);
for (Address coord : coordinators) {
View view = views.get(coord);
if (view != null) this.coords.put(coord, new ArrayList<Address>(view.getMembers()));
}
// For the merge participants which are not coordinator, we simply add them, and the
// associated
// membership list consists only of themselves
Collection<Address> merge_participants = Util.determineMergeParticipants(views);
merge_participants.removeAll(coordinators);
for (Address merge_participant : merge_participants) {
Collection<Address> tmp = new ArrayList<Address>();
tmp.add(merge_participant);
coords.putIfAbsent(merge_participant, tmp);
}
thread = gms.getThreadFactory().newThread(this, "MergeTask");
thread.setDaemon(true);
thread.start();
}
}
public void start() {
if (thread == null) {
thread = new Thread(this, "UDP.UcastReceiverThread");
thread.setDaemon(true);
running = true;
thread.start();
}
}
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();
}
}
/**
* Creates a table and fills it to capacity. Then starts a number of adder threads, each trying to
* add a seqno, blocking until there is more space. Each adder will block until the remover
* removes elements, so the adder threads get unblocked and can then add their elements to the
* buffer.
*/
public void testConcurrentAddAndRemove() throws Exception {
final int NUM = 5;
final Table<Integer> buf = new Table<Integer>(3, 10, 0);
for (int i = 1; i <= 10; i++) buf.add(i, i); // fill the buffer, add() will block now
CountDownLatch latch = new CountDownLatch(1);
Adder[] adders = new Adder[NUM];
for (int i = 0; i < adders.length; i++) {
adders[i] = new Adder(latch, i + 11, buf);
adders[i].start();
}
System.out.println("releasing threads");
latch.countDown();
System.out.print("waiting for threads to be done: ");
Thread remover =
new Thread("Remover") {
public void run() {
Util.sleep(2000);
List<Integer> list = buf.removeMany(true, 5);
System.out.println("\nremover: removed = " + list);
}
};
remover.start();
for (Adder adder : adders) {
try {
adder.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
remover.join();
System.out.println("OK");
System.out.println("buf = " + buf);
assert buf.size() == 10;
assertIndices(buf, 5, 5, 15);
List<Integer> list = buf.removeMany(true, 0);
System.out.println("removed = " + list);
assert list.size() == 10;
for (int i = 6; i <= 15; i++) assert list.contains(i);
assertIndices(buf, 15, 15, 15);
}
/** Starts the unicast and multicast receiver threads */
void startThreads() throws Exception {
if (ucast_receiver == null) {
// start the listener thread of the ucast_recv_sock
ucast_receiver = new UcastReceiver();
ucast_receiver.start();
if (Trace.trace) {
Trace.info("UDP.startThreads()", "created unicast receiver thread");
}
}
if (ip_mcast) {
if (mcast_receiver != null) {
if (mcast_receiver.isAlive()) {
if (Trace.trace) {
Trace.info(
"UDP.createThreads()",
"did not create new multicastreceiver thread as existing "
+ "multicast receiver thread is still running");
}
} else {
mcast_receiver = null; // will be created just below...
}
}
if (mcast_receiver == null) {
mcast_receiver = new Thread(this, "UDP mcast receiver");
mcast_receiver.setPriority(Thread.MAX_PRIORITY); // needed ????
mcast_receiver.setDaemon(true);
mcast_receiver.start();
}
}
if (use_outgoing_packet_handler) {
outgoing_packet_handler.start();
}
if (use_incoming_packet_handler) {
incoming_packet_handler.start();
}
}
