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https://issues.apache.org/jira/browse/SOLR-8323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15263020#comment-15263020
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ASF GitHub Bot commented on SOLR-8323:
--------------------------------------
Github user dragonsinth commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/32#discussion_r61504017
--- Diff:
solr/solrj/src/java/org/apache/solr/common/cloud/CollectionStatePredicate.java
---
@@ -0,0 +1,41 @@
+package org.apache.solr.common.cloud;
+
+/*
+ * 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.
+ */
+
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Interface to determine if a collection state matches a required state
+ *
+ * @see ZkStateReader#waitForState(String, long, TimeUnit,
CollectionStatePredicate)
+ */
+public interface CollectionStatePredicate {
+
+ /**
+ * Check the collection state matches a required state
+ *
+ * The collectionState parameter may be null if the collection does not
exist
+ * or has been deleted
--- End diff --
This wants to be `@param collectionState the current collection state, or
null if the collection doesn't exist or has been deleted`
> Add CollectionWatcher API to ZkStateReader
> ------------------------------------------
>
> Key: SOLR-8323
> URL: https://issues.apache.org/jira/browse/SOLR-8323
> Project: Solr
> Issue Type: Improvement
> Affects Versions: master
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Attachments: SOLR-8323.patch, SOLR-8323.patch, SOLR-8323.patch,
> SOLR-8323.patch
>
>
> An API to watch for changes to collection state would be a generally useful
> thing, both internally and for client use.
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