rpuch commented on code in PR #6199:
URL: https://github.com/apache/ignite-3/pull/6199#discussion_r2192079185


##########
modules/metastorage/src/main/java/org/apache/ignite/internal/metastorage/server/NotificationEnqueuedListener.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.ignite.internal.metastorage.server;
+
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import org.apache.ignite.internal.hlc.HybridTimestamp;
+import org.apache.ignite.internal.metastorage.Entry;
+
+/**
+ * Listener that gets invoked when {@link WatchProcessor}'s internal 
notification chain future is updated.
+ */
+@FunctionalInterface
+public interface NotificationEnqueuedListener {
+    /**
+     * Notifies this listener that {@link WatchProcessor}'s internal 
notification chain future is updated.
+     *
+     * <p>This must always be run under the same lock under which the 
notification future is updated.
+     *
+     * @param newNotificationFuture New notification future.
+     * @param entries Entries corresponding to the update (empty if the 
notification is not about a new revision,
+     *     but about Metastorage safe time advancement.
+     * @param timestamp Metastorage timestamp.
+     */
+    void onEnqueued(CompletableFuture<Void> newNotificationFuture, List<Entry> 
entries, HybridTimestamp timestamp);

Review Comment:
   I expanded javadoc to tell that the callback must complete fast



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