narendly commented on a change in pull request #1154:
URL: https://github.com/apache/helix/pull/1154#discussion_r462070242
##########
File path:
helix-core/src/main/java/org/apache/helix/spectator/RoutingTableProvider.java
##########
@@ -403,16 +403,55 @@ public RoutingTableSnapshot
getRoutingTableSnapshot(PropertyType propertyType, S
return snapshots;
}
+
/**
* Add RoutingTableChangeListener with user defined context
* @param routingTableChangeListener
* @param context user defined context
*/
public void addRoutingTableChangeListener(
final RoutingTableChangeListener routingTableChangeListener, Object
context) {
+ addRoutingTableChangeListener(routingTableChangeListener, context, false);
+ }
+
+ /**
+ * Add RoutingTableChangeListener with user defined context
+ * @param routingTableChangeListener
+ * @param context user defined context
+ * @param doInit whether to trigger the initial callback during adding
listener
+ */
+ public void addRoutingTableChangeListener(
+ final RoutingTableChangeListener routingTableChangeListener, Object
context, boolean doInit) {
_routingTableChangeListenerMap.put(routingTableChangeListener, new
ListenerContext(context));
logger.info("Attach RoutingTableProviderChangeListener {}",
routingTableChangeListener.getClass().getName());
+ if (doInit) {
+ if (_sourceDataTypeMap.isEmpty()) {
Review comment:
You could read this article:
https://stackoverflow.com/questions/24367472/is-an-object-created-first-and-then-its-constructor-executed.
Pay attention to point 4 - although taking a closer look, I don't think this
leaks itself as `this`. We actually see this in the commit:
https://github.com/apache/helix/commit/ff0485bdb65d1051ca63ecc97c5b864aee932465
##########
File path:
helix-core/src/main/java/org/apache/helix/spectator/RoutingTableProvider.java
##########
@@ -403,16 +403,55 @@ public RoutingTableSnapshot
getRoutingTableSnapshot(PropertyType propertyType, S
return snapshots;
}
+
/**
* Add RoutingTableChangeListener with user defined context
* @param routingTableChangeListener
* @param context user defined context
*/
public void addRoutingTableChangeListener(
final RoutingTableChangeListener routingTableChangeListener, Object
context) {
+ addRoutingTableChangeListener(routingTableChangeListener, context, false);
+ }
+
+ /**
+ * Add RoutingTableChangeListener with user defined context
+ * @param routingTableChangeListener
+ * @param context user defined context
+ * @param doInit whether to trigger the initial callback during adding
listener
+ */
+ public void addRoutingTableChangeListener(
Review comment:
I'm not quite seeing that - applications should program in a way that
expects some data in the snapshot, right? Their logic shouldn't try to "time
it" in their callback logic since that's never predictable.
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
