public static UUID convert16to32(UUID uuid) throws Exception {
byte b[] = uuid.toByteArray();
if (b.length != 2) throw new Exception("Not a 16-bits UUID!");
UUID retour = new UUID();
retour.uuidBytes = new byte[] {0, 0, 0, 0};
for (int i = 2; i < 4; i++) retour.uuidBytes[i] += b[i - 2];
retour.uuidLong = uuid.uuidLong;
retour.uuidString = null;
return retour;
}
public static UUID convert32to128(UUID uuid) {
byte[] b = uuid.toByteArray();
UUID retour = new UUID(b);
if (b.length == 16) return retour;
retour.uuidBytes = new byte[16];
System.arraycopy(getBaseUUIDAsBytes(), 0, retour.uuidBytes, 0, 16);
retour.uuidString = "";
retour.uuidLong = 0;
int decal = b.length == 2 ? 2 : 0;
for (int i = 0; i < b.length; i++) {
retour.uuidBytes[i + decal] += b[i];
}
return retour;
}
/**
* EventBus that handles normal Events (local) and RemoteEvents
*
* @author Mark Donszelmann
*/
public class RemoteEventBus extends SimpleEventBus {
// private Logger log = LoggerFactory.getLogger(getClass().getName());
private static final boolean DEBUG = false;
protected static <H> void dispatchEvent(RemoteEvent<H> event, H handler) {
event.dispatch(handler);
}
protected static void setSourceUuidOfEvent(RemoteEvent<?> event, int uuid) {
event.setSourceUUID(uuid);
}
protected static void setEventBusUuidOfEvent(RemoteEvent<?> event, long eventBusUUID) {
event.setEventBusUUID(eventBusUUID);
}
private interface Command {
void execute();
}
private Long uuid = UUID.uuidLong(8);
private int firingDepth = 0;
private List<Command> deferredDeltas;
private final Map<RemoteEvent.Type<?>, Map<Integer, List<?>>> map =
new HashMap<RemoteEvent.Type<?>, Map<Integer, List<?>>>();
public RemoteEventBus() {}
public Long getUUID() {
return uuid;
}
public <H> HandlerRegistration addHandler(RemoteEvent.Type<H> type, H handler) {
return doAdd(type, 0, handler);
}
public <H> HandlerRegistration addHandlerToSource(
final RemoteEvent.Type<H> type, int uuid, final H handler) {
if (uuid == 0) {
throw new NullPointerException("Cannot add a handler with a 0 uuid");
}
return doAdd(type, uuid, handler);
}
public void fireEvent(RemoteEvent<?> event) {
if (DEBUG) {
// log.info("Fire event " + event.getClass());
}
doFire(event, 0);
}
public void fireEventFromSource(RemoteEvent<?> event, int uuid) {
if (uuid == 0) {
throw new NullPointerException("Cannot fire from a 0 uuid");
}
if (DEBUG) {
// log.info("Fire event " + event.getClass() + " " + uuid);
}
doFire(event, uuid);
}
private void defer(Command command) {
if (deferredDeltas == null) {
deferredDeltas = new ArrayList<Command>();
}
deferredDeltas.add(command);
}
private <H> HandlerRegistration doAdd(
final RemoteEvent.Type<H> type, final int uuid, final H handler) {
if (type == null) {
throw new NullPointerException("Cannot add a handler with a null type");
}
if (handler == null) {
throw new NullPointerException("Cannot add a null handler");
}
if (firingDepth > 0) {
enqueueAdd(type, uuid, handler);
} else {
doAddNow(type, uuid, handler);
}
return new HandlerRegistration() {
public void removeHandler() {
if (firingDepth > 0) {
enqueueRemove(type, uuid, handler);
} else {
doRemoveNow(type, uuid, handler);
}
}
};
}
private <H> void doAddNow(RemoteEvent.Type<H> type, int uuid, H handler) {
List<H> l = ensureHandlerList(type, uuid);
l.add(handler);
}
private <H> void doFire(RemoteEvent<H> event, int uuid) {
if (event == null) {
throw new NullPointerException("Cannot fire null event");
}
try {
firingDepth++;
if (uuid != 0) {
setSourceUuidOfEvent(event, uuid);
}
setEventBusUuidOfEvent(event, getUUID());
List<H> handlers = getDispatchList(event.getAssociatedType(), uuid);
Set<Throwable> causes = null;
ListIterator<H> it = handlers.listIterator();
while (it.hasNext()) {
H handler = it.next();
try {
dispatchEvent(event, handler);
} catch (Throwable e) {
if (causes == null) {
causes = new HashSet<Throwable>();
}
causes.add(e);
}
}
if (causes != null) {
throw new UmbrellaException(causes);
}
} finally {
firingDepth--;
if (firingDepth == 0) {
handleQueuedAddsAndRemoves();
}
}
}
private <H> void doRemoveNow(RemoteEvent.Type<H> type, int uuid, H handler) {
List<H> l = getHandlerList(type, uuid);
boolean removed = l.remove(handler);
assert removed : "redundant remove call";
if (removed && l.isEmpty()) {
prune(type, uuid);
}
}
private <H> void enqueueAdd(final RemoteEvent.Type<H> type, final int uuid, final H handler) {
defer(
new Command() {
public void execute() {
doAddNow(type, uuid, handler);
}
});
}
private <H> void enqueueRemove(final RemoteEvent.Type<H> type, final int uuid, final H handler) {
defer(
new Command() {
public void execute() {
doRemoveNow(type, uuid, handler);
}
});
}
private <H> List<H> ensureHandlerList(RemoteEvent.Type<H> type, int uuid) {
Map<Integer, List<?>> sourceMap = map.get(type);
if (sourceMap == null) {
sourceMap = new HashMap<Integer, List<?>>();
map.put(type, sourceMap);
}
// safe, we control the puts.
@SuppressWarnings("unchecked")
List<H> handlers = (List<H>) sourceMap.get(uuid);
if (handlers == null) {
handlers = new ArrayList<H>();
sourceMap.put(uuid, handlers);
}
return handlers;
}
private <H> List<H> getDispatchList(RemoteEvent.Type<H> type, int uuid) {
List<H> directHandlers = getHandlerList(type, uuid);
if (uuid == 0) {
return directHandlers;
}
List<H> globalHandlers = getHandlerList(type, 0);
List<H> rtn = new ArrayList<H>(directHandlers);
rtn.addAll(globalHandlers);
return rtn;
}
private <H> List<H> getHandlerList(RemoteEvent.Type<H> type, int uuid) {
Map<Integer, List<?>> sourceMap = map.get(type);
if (sourceMap == null) {
return Collections.emptyList();
}
// safe, we control the puts.
@SuppressWarnings("unchecked")
List<H> handlers = (List<H>) sourceMap.get(uuid);
if (handlers == null) {
return Collections.emptyList();
}
return handlers;
}
private void handleQueuedAddsAndRemoves() {
if (deferredDeltas != null) {
try {
for (Command c : deferredDeltas) {
c.execute();
}
} finally {
deferredDeltas = null;
}
}
}
private void prune(RemoteEvent.Type<?> type, int uuid) {
Map<Integer, List<?>> sourceMap = map.get(type);
List<?> pruned = sourceMap.remove(uuid);
assert pruned != null : "Can't prune what wasn't there";
assert pruned.isEmpty() : "Pruned unempty list!";
if (sourceMap.isEmpty()) {
map.remove(type);
}
}
@Override
public String toString() {
return "RemoteEventBus";
}
}
