HoustonPutman commented on code in PR #909:
URL: https://github.com/apache/solr/pull/909#discussion_r915031868
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solr/solrj/src/java/org/apache/solr/common/cloud/ZkStateReader.java:
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@@ -246,6 +244,95 @@ public boolean canBeRemoved() {
}
}
+ /**
+ * A ConcurrentHashMap of active watcher by collection name
+ *
+ * <p>Each watcher DocCollectionWatch also contains the latest DocCollection
(state) observed
+ */
+ private static class DocCollectionWatches
+ extends ConcurrentHashMap<String,
StatefulCollectionWatch<DocCollectionWatcher>> {
+
+ /**
+ * Gets the DocCollection (state) of the collection which the
corresponding watch last observed
+ *
+ * @param collection the collection name to get DocCollection on
+ * @return The last observed DocCollection(state). if null, that means
there's no such
+ * collection.
+ */
+ private DocCollection getDocCollection(String collection) {
+ StatefulCollectionWatch<DocCollectionWatcher> watch = get(collection);
+ return watch != null ? watch.currentState : null;
+ }
+
+ /**
+ * Gets the active collections (collections that exist) being watched
+ *
+ * @return an immutable set of active collection names
+ */
+ private Set<String> activeCollections() {
+ return this.entrySet().stream()
+ .filter(
+ (Entry<String, StatefulCollectionWatch<DocCollectionWatcher>>
entry) ->
+ entry.getValue().currentState != null)
+ .map(Entry::getKey)
+ .collect(Collectors.toUnmodifiableSet());
+ }
+
+ /**
+ * Updates the latest observed DocCollection (state) of the {@link
StatefulCollectionWatch} if
+ * the collection is being watched
+ *
+ * @param collection the collection name
+ * @param newState the new DocCollection (state) observed
+ * @return whether an active watch exists for such collection
Review Comment:
Ok it looks like this return signature contract has changed from the
previous method.
The previous method (`updateWatchedCollection`) returned whether the state
changed. This is returning whether the new state is null. That's quite a
difference. Is there a reason you did this? It should be pretty easy to add in
an atomic boolean and check whether the state was changed and return that.
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