void addListener(
Object listener, PropertyKey propertyKey, ChangeType changeType, EventType[] eventType) {
checkConnected();
PropertyType type = propertyKey.getType();
synchronized (this) {
for (CallbackHandler handler : _handlers) {
// compare property-key path and listener reference
if (handler.getPath().equals(propertyKey.getPath())
&& handler.getListener().equals(listener)) {
LOG.info(
"Listener: "
+ listener
+ " on path: "
+ propertyKey.getPath()
+ " already exists. skip add");
return;
}
}
CallbackHandler newHandler =
new CallbackHandler(this, _zkclient, propertyKey, listener, eventType, changeType);
_handlers.add(newHandler);
LOG.info(
"Added listener: "
+ listener
+ " for type: "
+ type
+ " to path: "
+ newHandler.getPath());
}
}
@Override
public boolean removeListener(PropertyKey key, Object listener) {
LOG.info(
"Removing listener: "
+ listener
+ " on path: "
+ key.getPath()
+ " from cluster: "
+ _clusterName
+ " by instance: "
+ _instanceName);
synchronized (this) {
List<CallbackHandler> toRemove = new ArrayList<CallbackHandler>();
for (CallbackHandler handler : _handlers) {
// compare property-key path and listener reference
if (handler.getPath().equals(key.getPath()) && handler.getListener().equals(listener)) {
toRemove.add(handler);
}
}
_handlers.removeAll(toRemove);
// handler.reset() may modify the handlers list, so do it outside the iteration
for (CallbackHandler handler : toRemove) {
handler.reset();
}
}
return true;
}