alex-plekhanov commented on a change in pull request #6554: IGNITE-11073: 
Backup page store manager, initial
URL: https://github.com/apache/ignite/pull/6554#discussion_r341157408
 
 

 ##########
 File path: 
modules/core/src/main/java/org/apache/ignite/internal/pagemem/store/PageStoreListener.java
 ##########
 @@ -0,0 +1,35 @@
+/*
+ * 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.pagemem.store;
+
+import java.nio.ByteBuffer;
+
+/**
+ *
+ */
+@FunctionalInterface
+public interface PageStoreListener {
+    /** Default handler. */
+    public static PageStoreListener NO_OP = (pageId, buff) -> {};
 
 Review comment:
   Perhaps `NO_OP` listener is not needed at all if we will use `addListener` 
semantics.

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