spring-batch JpaItemWriterBuilder 源码
spring-batch JpaItemWriterBuilder 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/database/builder/JpaItemWriterBuilder.java
/*
* Copyright 2018-2021 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.batch.item.database.builder;
import jakarta.persistence.EntityManagerFactory;
import org.springframework.batch.item.database.JpaItemWriter;
import org.springframework.util.Assert;
/**
* A builder for the {@link JpaItemWriter}.
*
* @author Mahmoud Ben Hassine
* @since 4.1
* @see JpaItemWriter
*/
public class JpaItemWriterBuilder<T> {
private EntityManagerFactory entityManagerFactory;
private boolean usePersist = false;
/**
* The JPA {@link EntityManagerFactory} to obtain an entity manager from. Required.
* @param entityManagerFactory the {@link EntityManagerFactory}
* @return this instance for method chaining
* @see JpaItemWriter#setEntityManagerFactory(EntityManagerFactory)
*/
public JpaItemWriterBuilder<T> entityManagerFactory(EntityManagerFactory entityManagerFactory) {
this.entityManagerFactory = entityManagerFactory;
return this;
}
/**
* Set whether the entity manager should perform a persist instead of a merge.
* @param usePersist defaults to false
* @return this instance for method chaining
* @see JpaItemWriter#setUsePersist(boolean)
*/
public JpaItemWriterBuilder<T> usePersist(boolean usePersist) {
this.usePersist = usePersist;
return this;
}
/**
* Returns a fully built {@link JpaItemWriter}.
* @return the writer
*/
public JpaItemWriter<T> build() {
Assert.state(this.entityManagerFactory != null, "EntityManagerFactory must be provided");
JpaItemWriter<T> writer = new JpaItemWriter<>();
writer.setEntityManagerFactory(this.entityManagerFactory);
writer.setUsePersist(this.usePersist);
return writer;
}
}
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