public void register(MsgHandler handler) {
if (handler == null) {
throw new IllegalArgumentException("register handler cannot be null");
}
int[] interests = handler.getInterests();
if (interests != null) {
for (Integer interest : interests) {
Set<MsgHandler> msgHandlers = handlers.get(interest);
if (msgHandlers == null) {
CopyOnWriteArraySet<MsgHandler> created = new CopyOnWriteArraySet<>();
msgHandlers = handlers.putIfAbsent(interest, msgHandlers);
if (msgHandlers == null) {
msgHandlers = created;
}
}
msgHandlers.add(handler);
}
for (Integer interest : interests) {
Msg msg = stickyMsg.get(interest);
if (msg != null) {
handler.onMsg(msg);
}
}
} else {
throw new IllegalArgumentException("register handler which has no interest");
}
}
public void unregister(MsgHandler handler) {
if (handler == null) {
throw new IllegalArgumentException("unregister handler cannot be null");
}
int[] interests = handler.getInterests();
if (interests == null) {
for (Integer interest : interests) {
Set<MsgHandler> msgHandlers = handlers.get(interest);
if (msgHandlers != null) {
msgHandlers.remove(handler);
}
}
} else {
throw new IllegalArgumentException("unregister handler which has no interest");
}
}