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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service

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/*
 * Copyright 2011-2024 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed 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://aws.amazon.com/apache2.0
 *
 * This file 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 com.amazonaws.services.dynamodbv2.datamodeling;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Annotation for marking a property as an optimistic locking version attribute.
 *
 * 

Applied to the getter method or the class field for the class's version * property. If the annotation is applied directly to the class field, the * corresponding getter and setter must be declared in the same class. * *

Alternately, the meta-annotation {@link DynamoDBVersioned} may be used * to annotate a custom annotation, or directly to the field/getter.

* *

Only nullable, integral numeric types (e.g. Integer, Long) can be used as * version properties. On a save() operation, the {@link DynamoDBMapper} will * attempt to increment the version property and assert that the service's value * matches the client's. New objects will be assigned a version of 1 when saved.

*

Note that for batchWrite, and by extension batchSave and batchDelete, no * version checks are performed, as required by the * {@link com.amazonaws.services.dynamodbv2.AmazonDynamoDB#batchWriteItem(BatchWriteItemRequest)} * API.

* * @see com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBVersioned */ @DynamoDB @DynamoDBVersioned @Retention(RetentionPolicy.RUNTIME) @Target({ElementType.FIELD, ElementType.METHOD}) public @interface DynamoDBVersionAttribute { /** * Optional parameter when the name of the attribute as stored in DynamoDB * should differ from the name used by the getter / setter. */ String attributeName() default ""; }




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