TransactionAttributeSource (Spring Framework 5.2.12.RELEASE API)

所有已知实现类:
AbstractFallbackTransactionAttributeSource, AnnotationTransactionAttributeSource, CompositeTransactionAttributeSource, MatchAlwaysTransactionAttributeSource, MethodMapTransactionAttributeSource, NameMatchTransactionAttributeSource
```
public interface TransactionAttributeSource
```
Strategy interface used by TransactionInterceptor for metadata retrieval.
Implementations know how to source transaction attributes, whether from configuration, metadata attributes at source level (such as Java 5 annotations), or anywhere else.
从以下版本开始:
15.04.2003
作者:
Rod Johnson, Juergen Hoeller
另请参阅:
TransactionAspectSupport.setTransactionAttributeSource(org.springframework.transaction.interceptor.TransactionAttributeSource), TransactionProxyFactoryBean.setTransactionAttributeSource(org.springframework.transaction.interceptor.TransactionAttributeSource), AnnotationTransactionAttributeSource

方法概要

所有方法实例方法抽象方法默认方法
修饰符和类型	方法	说明
`TransactionAttribute`	`getTransactionAttribute(Method method, Class<?> targetClass)`	Return the transaction attribute for the given method, or `null` if the method is non-transactional.
`default boolean`	`isCandidateClass(Class<?> targetClass)`	Determine whether the given class is a candidate for transaction attributes in the metadata format of this `TransactionAttributeSource`.

- 方法详细资料
  - isCandidateClass
```
default boolean isCandidateClass(Class<?> targetClass)
```
    Determine whether the given class is a candidate for transaction attributes in the metadata format of this TransactionAttributeSource.
    If this method returns false, the methods on the given class will not get traversed for getTransactionAttribute(java.lang.reflect.Method, java.lang.Class<?>) introspection. Returning false is therefore an optimization for non-affected classes, whereas true simply means that the class needs to get fully introspected for each method on the given class individually.
    参数:
    targetClass - the class to introspect
    返回:
    false if the class is known to have no transaction attributes at class or method level; true otherwise. The default implementation returns true, leading to regular introspection.
    从以下版本开始:
    5.2
  - getTransactionAttribute
```
@Nullable
TransactionAttribute getTransactionAttribute(Method method,
                                             @Nullable
                                             Class<?> targetClass)
```
    Return the transaction attribute for the given method, or null if the method is non-transactional.
    参数:
    method - the method to introspect
    targetClass - the target class (may be null, in which case the declaring class of the method must be used)
    返回:
    the matching transaction attribute, or null if none found