spring TransactionCallback 源码
spring TransactionCallback 代码
文件路径：/spring-tx/src/main/java/org/springframework/transaction/support/TransactionCallback.java
/*
* Copyright 2002-2021 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.transaction.support;
import org.springframework.lang.Nullable;
import org.springframework.transaction.TransactionStatus;
/**
* Callback interface for transactional code. Used with {@link TransactionTemplate}'s
* {@code execute} method, often as anonymous class within a method implementation.
*
* <p>Typically used to assemble various calls to transaction-unaware data access
* services into a higher-level service method with transaction demarcation. As an
* alternative, consider the use of declarative transaction demarcation (e.g. through
* Spring's {@link org.springframework.transaction.annotation.Transactional} annotation).
*
* @author Juergen Hoeller
* @since 17.03.2003
* @param <T> the result type
* @see TransactionTemplate
* @see CallbackPreferringPlatformTransactionManager
*/
@FunctionalInterface
public interface TransactionCallback<T> {
/**
* Gets called by {@link TransactionTemplate#execute} within a transactional context.
* Does not need to care about transactions itself, although it can retrieve and
* influence the status of the current transaction via the given status object,
* e.g. setting rollback-only.
* <p>Allows for returning a result object created within the transaction, i.e. a
* domain object or a collection of domain objects. A RuntimeException thrown by the
* callback is treated as application exception that enforces a rollback. Any such
* exception will be propagated to the caller of the template, unless there is a
* problem rolling back, in which case a TransactionException will be thrown.
* @param status associated transaction status
* @return a result object, or {@code null}
* @see TransactionTemplate#execute
* @see CallbackPreferringPlatformTransactionManager#execute
*/
@Nullable
T doInTransaction(TransactionStatus status);
}
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