HoustonPutman commented on code in PR #909:
URL: https://github.com/apache/solr/pull/909#discussion_r910100174
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solr/solrj/src/java/org/apache/solr/common/cloud/ZkStateReader.java:
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@@ -246,6 +244,90 @@ 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,
DocCollectionWatch<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) {
+ DocCollectionWatch<DocCollectionWatcher> watch = get(collection);
+ return watch != null ? watch.currentDoc : 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, DocCollectionWatch<DocCollectionWatcher>> entry)
->
+ entry.getValue().currentDoc != null)
+ .map(Entry::getKey)
+ .collect(Collectors.toUnmodifiableSet());
+ }
+
+ /**
+ * Updates the latest observed DocCollection (state) of the {@link
DocCollectionWatch} 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
+ */
+ private boolean updateDocCollection(String collection, DocCollection
newState) {
+ DocCollectionWatch<DocCollectionWatcher> watch = get(collection);
+ if (watch != null) {
+ DocCollection oldState = watch.currentDoc;
+ if (oldState == null && newState == null) {
+ // OK, the collection not yet exist in ZK
+ } else if (oldState == null) {
+ if (log.isDebugEnabled()) {
+ log.debug("Add data for [{}] ver [{}]", collection,
newState.getZNodeVersion());
+ }
+ watch.currentDoc = newState;
+ } else if (newState == null) {
+ log.debug("Removing cached collection state for [{}]", collection);
+ watch.currentDoc = null;
+ } else { // both new and old states are non-null
+ int oldCVersion =
+ oldState.getPerReplicaStates() == null ? -1 :
oldState.getPerReplicaStates().cversion;
+ int newCVersion =
+ newState.getPerReplicaStates() == null ? -1 :
newState.getPerReplicaStates().cversion;
+ if (oldState.getZNodeVersion() < newState.getZNodeVersion()
+ || oldCVersion < newCVersion) {
+ watch.currentDoc = newState;
+ if (log.isDebugEnabled()) {
+ log.debug(
+ "Updating data for [{}] from [{}] to [{}]",
+ collection,
+ oldState.getZNodeVersion(),
+ newState.getZNodeVersion());
+ }
+ }
+ }
+ return true;
+ } else {
+ return false;
+ }
+ }
Review Comment:
> Just a really minor nit, perhaps we can even remove the `if (watch !=
null)` check now as it's `computeIfPresent`?
yeah, that's a good call.
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