org.springframework.transaction.support

## Class TransactionSynchronizationAdapter

- java.lang.Object
- - org.springframework.transaction.support.TransactionSynchronizationAdapter

- All Implemented Interfaces:
    Flushable, Ordered, TransactionSynchronization
  Direct Known Subclasses:
    SpringLobCreatorSynchronization

      public abstract class TransactionSynchronizationAdapter
      extends Object
      implements TransactionSynchronization, Ordered

  Simple `TransactionSynchronization` adapter containing empty method implementations, for easier overriding of single methods.

  Also implements the `Ordered` interface to enable the execution order of synchronizations to be controlled declaratively. The default `order` is `Ordered.LOWEST_PRECEDENCE`, indicating late execution; return a lower value for earlier execution.

  Since:
    22.01.2004
  Author:
    Juergen Hoeller

- - ### Field Summary

    - ### Fields inherited from interface org.springframework.transaction.support.TransactionSynchronization

      `STATUS_COMMITTED, STATUS_ROLLED_BACK, STATUS_UNKNOWN`

    - ### Fields inherited from interface org.springframework.core.Ordered

      `HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `TransactionSynchronizationAdapter()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `afterCommit()` Invoked after transaction commit.
    `void` | `afterCompletion(int status)` Invoked after transaction commit/rollback.
    `void` | `beforeCommit(boolean readOnly)` Invoked before transaction commit (before "beforeCompletion").
    `void` | `beforeCompletion()` Invoked before transaction commit/rollback.
    `void` | `flush()` Flush the underlying session to the datastore, if applicable: for example, a Hibernate/JPA session.
    `int` | `getOrder()` Return the order value of this object, with a higher value meaning greater in terms of sorting.
    `void` | `resume()` Resume this synchronization.
    `void` | `suspend()` Suspend this synchronization.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### TransactionSynchronizationAdapter

          public TransactionSynchronizationAdapter()

  - ### Method Detail

    - #### getOrder

          public int getOrder()

      Description copied from interface: `Ordered`
      Return the order value of this object, with a higher value meaning greater in terms of sorting.

      Normally starting with 0, with `Integer.MAX_VALUE` indicating the greatest value. Same order values will result in arbitrary positions for the affected objects.

      Higher values can be interpreted as lower priority. As a consequence, the object with the lowest value has highest priority (somewhat analogous to Servlet "load-on-startup" values).

      Specified by:
        `getOrder` in interface `Ordered`
      Returns:
        the order value

    - #### suspend

          public void suspend()

      Description copied from interface: `TransactionSynchronization`
      Suspend this synchronization. Supposed to unbind resources from TransactionSynchronizationManager if managing any.
      Specified by:
        `suspend` in interface `TransactionSynchronization`
      See Also:
        `TransactionSynchronizationManager.unbindResource(java.lang.Object)`

    - #### resume

          public void resume()

      Description copied from interface: `TransactionSynchronization`
      Resume this synchronization. Supposed to rebind resources to TransactionSynchronizationManager if managing any.
      Specified by:
        `resume` in interface `TransactionSynchronization`
      See Also:
        `TransactionSynchronizationManager.bindResource(java.lang.Object, java.lang.Object)`

    - #### flush

          public void flush()

      Description copied from interface: `TransactionSynchronization`
      Flush the underlying session to the datastore, if applicable: for example, a Hibernate/JPA session.
      Specified by:
        `flush` in interface `Flushable`
      Specified by:
        `flush` in interface `TransactionSynchronization`
      See Also:
        `TransactionStatus.flush()`

    - #### beforeCommit

          public void beforeCommit(boolean readOnly)

      Description copied from interface: `TransactionSynchronization`
      Invoked before transaction commit (before "beforeCompletion"). Can e.g. flush transactional O/R Mapping sessions to the database.

      This callback does not mean that the transaction will actually be committed. A rollback decision can still occur after this method has been called. This callback is rather meant to perform work that's only relevant if a commit still has a chance to happen, such as flushing SQL statements to the database.

      Note that exceptions will get propagated to the commit caller and cause a rollback of the transaction.

      Specified by:
        `beforeCommit` in interface `TransactionSynchronization`
      Parameters:
        `readOnly` - whether the transaction is defined as read-only transaction
      See Also:
        `TransactionSynchronization.beforeCompletion()`

    - #### beforeCompletion

          public void beforeCompletion()

      Description copied from interface: `TransactionSynchronization`
      Invoked before transaction commit/rollback. Can perform resource cleanup before transaction completion.

      This method will be invoked after `beforeCommit`, even when `beforeCommit` threw an exception. This callback allows for closing resources before transaction completion, for any outcome.

      Specified by:
        `beforeCompletion` in interface `TransactionSynchronization`
      See Also:
        `TransactionSynchronization.beforeCommit(boolean)`, `TransactionSynchronization.afterCompletion(int)`

    - #### afterCommit

          public void afterCommit()

      Description copied from interface: `TransactionSynchronization`
      Invoked after transaction commit. Can perform further operations right after the main transaction has successfully committed.

      Can e.g. commit further operations that are supposed to follow on a successful commit of the main transaction, like confirmation messages or emails.

      NOTE: The transaction will have been committed already, but the transactional resources might still be active and accessible. As a consequence, any data access code triggered at this point will still "participate" in the original transaction, allowing to perform some cleanup (with no commit following anymore!), unless it explicitly declares that it needs to run in a separate transaction. Hence: Use `PROPAGATION_REQUIRES_NEW` for any transactional operation that is called from here.

      Specified by:
        `afterCommit` in interface `TransactionSynchronization`

    - #### afterCompletion

          public void afterCompletion(int status)

      Description copied from interface: `TransactionSynchronization`
      Invoked after transaction commit/rollback. Can perform resource cleanup after transaction completion.

      NOTE: The transaction will have been committed or rolled back already, but the transactional resources might still be active and accessible. As a consequence, any data access code triggered at this point will still "participate" in the original transaction, allowing to perform some cleanup (with no commit following anymore!), unless it explicitly declares that it needs to run in a separate transaction. Hence: Use `PROPAGATION_REQUIRES_NEW` for any transactional operation that is called from here.

      Specified by:
        `afterCompletion` in interface `TransactionSynchronization`
      Parameters:
        `status` - completion status according to the `STATUS_*` constants
      See Also:
        `TransactionSynchronization.STATUS_COMMITTED`, `TransactionSynchronization.STATUS_ROLLED_BACK`, `TransactionSynchronization.STATUS_UNKNOWN`, `TransactionSynchronization.beforeCompletion()`