| /* |
| * 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.directmemory.lightning; |
| |
| /** |
| * <p> |
| * Defines the comparison strategy of classes between different serializers. The standard strategy of Java is |
| * SerialVersionUID but Lightning has some lighter algorithm which only takes properties into account. |
| * </p> |
| * <p> |
| * {@link #LightningChecksum} is a lightweight checksum only taking the defined attributes into account and is pretty |
| * insensitive to other changes in classes but adding / removing of attributes is not supported. This strategy is used |
| * by default.<br> |
| * {@link #SerialVersionUID} is using the standard Java serialVersionUID fields (or if not provided calculates it's |
| * value from the given class). Using this value you can force Lightning to see different versions of a class to be |
| * compatible but only adding attributes in newer class versions is supported.<br> |
| * {@link #SkipComparison} skips any kind of comparison check and can be used when user provided marshallers can handle |
| * different versions of classes. This could be used to implement some kind of schema evolution but is only recommended |
| * for export use. |
| * </p> |
| */ |
| public enum ClassComparisonStrategy |
| { |
| |
| /** |
| * Default Java Serialization like SerialVersionUID |
| */ |
| SerialVersionUID, |
| |
| /** |
| * Lightning checksum calculation |
| */ |
| LightningChecksum, |
| |
| /** |
| * Instructs Lightning to skip all kinds of comparison between the different ClassDefinitionContainers. This is not |
| * recommended but is required for possible schema evolution features. |
| */ |
| SkipComparison |
| |
| } |