org.springframework.transaction.support

## Interface TransactionCallback<T>

- All Known Implementing Classes:
    TransactionCallbackWithoutResult

      public interface TransactionCallback<T>

  Callback interface for transactional code. Used with `TransactionTemplate`'s `execute` method, often as anonymous class within a method implementation.

  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 `Transactional` annotation).

  Since:
    17.03.2003
  Author:
    Juergen Hoeller
  See Also:
    `TransactionTemplate`, `CallbackPreferringPlatformTransactionManager`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `T` | `doInTransaction(TransactionStatus status)` Gets called by `TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback<T>)` within a transactional context.

- - ### Method Detail

    - #### doInTransaction

          T doInTransaction(TransactionStatus status)

      Gets called by `TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback<T>)` 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.

      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.

      Parameters:
        `status` - associated transaction status
      Returns:
        a result object, or `null`
      See Also:
        `TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback<T>)`, `CallbackPreferringPlatformTransactionManager.execute(org.springframework.transaction.TransactionDefinition, org.springframework.transaction.support.TransactionCallback<T>)`