Schnittstelle CDOUserTransaction

Methodendetails

• commit

  CDOCommitInfo commit() throws ConcurrentAccessException, CommitException

  Same as commit(null).

  Löst aus:

  ConcurrentAccessException

  CommitException

  Seit:

  3.0

• commit

  CDOCommitInfo commit(IProgressMonitor monitor) throws ConcurrentAccessException, CommitException

  Commits the modifications of this transaction to the repository and returns a commit info object if successful.

  Various kinds of problems can cause the commit to fail and not all of them can be avoided by acquiring pessimistic locks on the modified objects. In particular you must expect and handle containment cycle exceptions. The following example shows how write robust transactions:

      CDOTransaction transaction = null;
  
      try
      {
        transaction = session.openTransaction();
  
        for (;;)
        {
          transaction.getViewLock().lock();
  
          try
          {
            CDOResource resource = transaction.getResource("/stock/resource1");
  
            // Modify the model here...
  
            transaction.commit();
            break;
          }
          catch (ConcurrentAccessException ex)
          {
            transaction.rollback();
          }
          catch (CommitException ex)
          {
            throw ex.wrap();
          }
          finally
          {
            transaction.getViewLock().unlock();
          }
        }
      }
      finally
      {
        if (transaction != null)
        {
          transaction.close();
        }
      }
   

  Note that the transaction stays functional after a any call to the commit() methods. If the transaction is not closed after a commit it can be used to apply additional modifications to the model.

  Löst aus:

  ConcurrentAccessException

  CommitException

  Seit:

  3.0

• rollback

  void rollback()

• setSavepoint

  CDOUserSavepoint setSavepoint()

  Creates a save point in the CDOTransaction that can be used to roll back a part of the transaction

  Save points do not involve the server side, everything is done on the client side.

  Seit:

  3.0

• getLastSavepoint

  CDOUserSavepoint getLastSavepoint()

  Seit:

  3.0