spring TransactionAttributeSource 源码
spring TransactionAttributeSource 代码
文件路径：/spring-tx/src/main/java/org/springframework/transaction/interceptor/TransactionAttributeSource.java
/*
* Copyright 2002-2022 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.transaction.interceptor;
import java.lang.reflect.Method;
import org.springframework.lang.Nullable;
/**
* Strategy interface used by {@link TransactionInterceptor} for metadata retrieval.
*
* <p>Implementations know how to source transaction attributes, whether from configuration,
* metadata attributes at source level (such as annotations), or anywhere else.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 15.04.2003
* @see TransactionInterceptor#setTransactionAttributeSource
* @see TransactionProxyFactoryBean#setTransactionAttributeSource
* @see org.springframework.transaction.annotation.AnnotationTransactionAttributeSource
*/
public interface TransactionAttributeSource {
/**
* Determine whether the given class is a candidate for transaction attributes
* in the metadata format of this {@code TransactionAttributeSource}.
* <p>If this method returns {@code false}, the methods on the given class
* will not get traversed for {@link #getTransactionAttribute} introspection.
* Returning {@code false} is therefore an optimization for non-affected
* classes, whereas {@code true} simply means that the class needs to get
* fully introspected for each method on the given class individually.
* @param targetClass the class to introspect
* @return {@code false} if the class is known to have no transaction
* attributes at class or method level; {@code true} otherwise. The default
* implementation returns {@code true}, leading to regular introspection.
* @since 5.2
*/
default boolean isCandidateClass(Class<?> targetClass) {
return true;
}
/**
* Return the transaction attribute for the given method,
* or {@code null} if the method is non-transactional.
* @param method the method to introspect
* @param targetClass the target class (may be {@code null},
* in which case the declaring class of the method must be used)
* @return the matching transaction attribute, or {@code null} if none found
*/
@Nullable
TransactionAttribute getTransactionAttribute(Method method, @Nullable Class<?> targetClass);
}
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