Github user HoustonPutman commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/313#discussion_r177866085
--- Diff:
solr/solrj/src/java/org/apache/solr/common/cloud/CollectionSetWatcher.java ---
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.common.cloud;
+
+import java.util.Set;
+
+/**
+ * Callback registered with {@link
ZkStateReader#registerCollectionSetWatcher(CollectionSetWatcher)}
+ * and called whenever the cluster's collection set changes.
+ */
+public interface CollectionSetWatcher {
--- End diff --
There is likely a better name. I named it this because it is watching for
the set of collections. `CollectionsWatcher` may be a better name, or
`CollectionsListener`.
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