Package org.eclipse.emf.cdo.transaction
Interface CDOUserTransaction
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- All Known Subinterfaces:
CDOTransaction
,CDOXATransaction
,InternalCDOTransaction
,InternalCDOUserTransaction
,InternalCDOXATransaction
- All Known Implementing Classes:
CDOPushTransaction
public interface CDOUserTransaction
Provides functionality that is common to bothsingle
transactions anddistributed
(XA) transactions.- Since:
- 2.0
- Author:
- Simon McDuff
- No Implement
- This interface is not intended to be implemented by clients.
- No Extend
- This interface is not intended to be extended by clients.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description CDOCommitInfo
commit()
Same ascommit(null)
.CDOCommitInfo
commit(IProgressMonitor monitor)
Commits the modifications of this transaction to the repository and returns acommit info
object if successful.CDOUserSavepoint
getLastSavepoint()
void
rollback()
CDOUserSavepoint
setSavepoint()
Creates a save point in theCDOTransaction
that can be used to roll back a part of the transaction
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Method Detail
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commit
CDOCommitInfo commit() throws ConcurrentAccessException, CommitException
Same ascommit(null)
.- Throws:
ConcurrentAccessException
CommitException
- Since:
- 3.0
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commit
CDOCommitInfo commit(IProgressMonitor monitor) throws ConcurrentAccessException, CommitException
Commits the modifications of this transaction to the repository and returns acommit 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 handlecontainment 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 thecommit()
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
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rollback
void rollback()
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setSavepoint
CDOUserSavepoint setSavepoint()
Creates a save point in theCDOTransaction
that can be used to roll back a part of the transactionSave points do not involve the server side, everything is done on the client side.
- Since:
- 3.0
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getLastSavepoint
CDOUserSavepoint getLastSavepoint()
- Since:
- 3.0
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