org.eclipse.emf.cdo.transaction
Interface CDOUserTransaction

All Known Subinterfaces:

CDOTransaction, CDOXATransaction, InternalCDOTransaction, InternalCDOUserTransaction, InternalCDOXATransaction

All Known Implementing Classes:

CDOPushTransaction

public interface CDOUserTransaction

Provides functionality that is common to both single transactions and distributed (XA) transactions.

Since:

2.0

No Implement

This interface is not intended to be implemented by clients.

No Extend

This interface is not intended to be extended by clients.

commit

CDOCommitInfo commit()
                     throws ConcurrentAccessException,
                            CommitException

Same as commit(null).

Throws:

ConcurrentAccessException

CommitException

Since:

3.0

commit

CDOCommitInfo commit(IProgressMonitor progressMonitor)
                     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 (;;)
      {
        try
        {
          synchronized (transaction)
          {
            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
    {
      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.

Throws:

ConcurrentAccessException

CommitException

Since:

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.

Since:

3.0

getLastSavepoint

CDOUserSavepoint getLastSavepoint()

Since:

3.0