spring TransactionAnnotationParser 源码
spring TransactionAnnotationParser 代码
文件路径：/spring-tx/src/main/java/org/springframework/transaction/annotation/TransactionAnnotationParser.java
/*
* Copyright 2002-2019 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.annotation;
import java.lang.reflect.AnnotatedElement;
import org.springframework.lang.Nullable;
import org.springframework.transaction.interceptor.TransactionAttribute;
/**
* Strategy interface for parsing known transaction annotation types.
* {@link AnnotationTransactionAttributeSource} delegates to such
* parsers for supporting specific annotation types such as Spring's own
* {@link Transactional}, JTA 1.2's {@link jakarta.transaction.Transactional}
* or EJB3's {@link jakarta.ejb.TransactionAttribute}.
*
* @author Juergen Hoeller
* @since 2.5
* @see AnnotationTransactionAttributeSource
* @see SpringTransactionAnnotationParser
* @see Ejb3TransactionAnnotationParser
* @see JtaTransactionAnnotationParser
*/
public interface TransactionAnnotationParser {
/**
* Determine whether the given class is a candidate for transaction attributes
* in the annotation format of this {@code TransactionAnnotationParser}.
* <p>If this method returns {@code false}, the methods on the given class
* will not get traversed for {@code #parseTransactionAnnotation} 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
* annotations 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;
}
/**
* Parse the transaction attribute for the given method or class,
* based on an annotation type understood by this parser.
* <p>This essentially parses a known transaction annotation into Spring's metadata
* attribute class. Returns {@code null} if the method/class is not transactional.
* @param element the annotated method or class
* @return the configured transaction attribute, or {@code null} if none found
* @see AnnotationTransactionAttributeSource#determineTransactionAttribute
*/
@Nullable
TransactionAttribute parseTransactionAnnotation(AnnotatedElement element);
}
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