spring-data-elasticsearch SeqNoPrimaryTerm 源码
spring-data-elasticsearch SeqNoPrimaryTerm 代码
文件路径：/src/main/java/org/springframework/data/elasticsearch/core/query/SeqNoPrimaryTerm.java
/*
* Copyright 2020-2022 the original author or authors.
*
* 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
*
* https://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.springframework.data.elasticsearch.core.query;
/**
* <p>
* A container for seq_no and primary_term values. When an entity class contains a field of this type, it will be
* automatically filled with SeqNoPrimaryTerm instance on read operations (like get or search), and also, when the
* SeqNoPrimaryTerm is not {@literal null} and filled with seq_no and primary_term, they will be sent to Elasticsearch
* when indexing such an entity.
* </p>
* <p>
* This allows to implement optimistic locking pattern for full-update scenario, when an entity is first read from
* Elasticsearch and then gets reindexed with new _content. Index operations will throw an
* {@link org.springframework.dao.OptimisticLockingFailureException} if the seq_no + primary_term pair already has
* different values for the given document. See Elasticsearch documentation for more information:
* https://www.elastic.co/guide/en/elasticsearch/reference/current/optimistic-concurrency-control.html
* </p>
* <p>
* A property of this type is implicitly @{@link org.springframework.data.annotation.Transient} and never gets included
* into a mapping at Elasticsearch side.
* </p>
* <p>
* A SeqNoPrimaryTerm instance cannot contain an invalid or unassigned seq_no or primary_term.
* </p>
*
* @author Roman Puchkovskiy
* @since 4.0
*/
public record SeqNoPrimaryTerm(long sequenceNumber, long primaryTerm) {
/**
* Creates an instance of SeqNoPrimaryTerm with the given seq_no and primary_term. The passed values are validated:
* sequenceNumber must be non-negative, primaryTerm must be positive. If validation fails, an IllegalArgumentException
* is thrown.
*
* @param sequenceNumber seq_no, must not be negative
* @param primaryTerm primary_term, must be positive
* @throws IllegalArgumentException if seq_no or primary_term is not valid
*/
public SeqNoPrimaryTerm {
if (sequenceNumber < 0) {
throw new IllegalArgumentException("seq_no should not be negative, but it's " + sequenceNumber);
}
if (primaryTerm <= 0) {
throw new IllegalArgumentException("primary_term should be positive, but it's " + primaryTerm);
}
}
@Override
public String toString() {
return "SeqNoPrimaryTerm{" + "sequenceNumber=" + sequenceNumber + ", primaryTerm=" + primaryTerm + '}';
}
}
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