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## org.springframework.transaction.interceptor
Class AbstractFallbackTransactionAttributeSource

    java.lang.Object
      org.springframework.transaction.interceptor.AbstractFallbackTransactionAttributeSource

All Implemented Interfaces:
  TransactionAttributeSource

Direct Known Subclasses:
  AnnotationTransactionAttributeSource, AttributesTransactionAttributeSource

    public abstract class AbstractFallbackTransactionAttributeSource

extends Object
implements TransactionAttributeSource

Abstract implementation of `TransactionAttributeSource` that caches attributes for methods and implements a fallback policy: 1. specific target method; 2. target class; 3. declaring method; 4. declaring class/interface.

Defaults to using the target class's transaction attribute if none is associated with the target method. Any transaction attribute associated with the target method completely overrides a class transaction attribute. If none found on the target class, the interface that the invoked method has been called through (in case of a JDK proxy) will be checked.

This implementation caches attributes by method after they are first used. If it is ever desirable to allow dynamic changing of transaction attributes (which is very unlikely), caching could be made configurable. Caching is desirable because of the cost of evaluating rollback rules.

Since:
  1.1
Author:
  Rod Johnson, Juergen Hoeller

Field Summary
`protected Log` | `logger` Logger available to subclasses.

Constructor Summary
`AbstractFallbackTransactionAttributeSource()`

Method Summary
`protected boolean` | `allowPublicMethodsOnly()` Should only public methods be allowed to have transactional semantics?
`protected abstract TransactionAttribute` | `findTransactionAttribute(Class clazz)` Subclasses need to implement this to return the transaction attribute for the given class, if any.
`protected abstract TransactionAttribute` | `findTransactionAttribute(Method method)` Subclasses need to implement this to return the transaction attribute for the given method, if any.
`protected Object` | `getCacheKey(Method method, Class targetClass)` Determine a cache key for the given method and target class.
`TransactionAttribute` | `getTransactionAttribute(Method method, Class targetClass)` Determine the transaction attribute for this method invocation.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### logger

    protected final Log logger

  Logger available to subclasses.

  As this base class is not marked Serializable, the logger will be recreated after serialization - provided that the concrete subclass is Serializable.

Constructor Detail

### AbstractFallbackTransactionAttributeSource

    public AbstractFallbackTransactionAttributeSource()

Method Detail

### getTransactionAttribute

    public TransactionAttribute getTransactionAttribute(Method method,
                                                        Class targetClass)

  Determine the transaction attribute for this method invocation.

  Defaults to the class's transaction attribute if no method attribute is found.

  Specified by:
    `getTransactionAttribute` in interface `TransactionAttributeSource`
  Parameters:
    `method` - the method for the current invocation (never `null`)
    `targetClass` - the target class for this invocation (may be `null`)
  Returns:
    TransactionAttribute for this method, or `null` if the method is not transactional

### getCacheKey

    protected Object getCacheKey(Method method,
                                 Class targetClass)

  Determine a cache key for the given method and target class.

  Must not produce same key for overloaded methods. Must produce same key for different instances of the same method.

  Parameters:
    `method` - the method (never `null`)
    `targetClass` - the target class (may be `null`)
  Returns:
    the cache key (never `null`)

### findTransactionAttribute

    protected abstract TransactionAttribute findTransactionAttribute(Method method)

  Subclasses need to implement this to return the transaction attribute for the given method, if any.

  Parameters:
    `method` - the method to retrieve the attribute for
  Returns:
    all transaction attribute associated with this method (or `null` if none)

### findTransactionAttribute

    protected abstract TransactionAttribute findTransactionAttribute(Class clazz)

  Subclasses need to implement this to return the transaction attribute for the given class, if any.

  Parameters:
    `clazz` - the class to retrieve the attribute for
  Returns:
    all transaction attribute associated with this class (or `null` if none)

### allowPublicMethodsOnly

    protected boolean allowPublicMethodsOnly()

  Should only public methods be allowed to have transactional semantics?

  The default implementation returns `false`.

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