[GitHub] [ignite-3] sanpwc commented on a change in pull request #645: IGNITE-16368 Implement a futures for causality tokens

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sanpwc commented on a change in pull request #645:
URL: https://github.com/apache/ignite-3/pull/645#discussion_r817414206



##########
File path: modules/core/src/main/java/org/apache/ignite/internal/causality/OutdatedTokenException.java
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@@ -0,0 +1,43 @@
+/*
+ * 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.causality;
+
+import org.apache.ignite.lang.IgniteInternalCheckedException;
+import org.apache.ignite.lang.IgniteStringFormatter;
+
+/**
+ * This exception is thrown when {@link VersionedValue#get(long)} is called with an outdated token
+ * (this means that the history size of VersionedValue is not enough in order to get a value related to the token).
+ *
+ * <p>{@link VersionedValue} stores a value per the causality token.
+ * See {@link VersionedValue#get(long)}.
+ */
+public class OutdatedTokenException extends IgniteInternalCheckedException {
+
+    /**
+     * Constructor.
+     *
+     * @param outdatedToken The token which has expired.
+     * @param actualToken Token for the actual stored value.
+     * @param historySize Size of stored history.
+     */
+    public OutdatedTokenException(long outdatedToken, long actualToken, int historySize) {

Review comment:
       Seems, that such exception should never be thrown, so why it's checked?




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