Package org.eclipse.emf.cdo.transaction
Interface CDOTransactionHandler1.WithUndo
- All Superinterfaces:
CDOTransactionHandler1,CDOTransactionHandlerBase
- All Known Implementing Classes:
CDOAutoAttacher,CDOAutoLocker,CDOAutoLocker.ForSingleValuedChanges,CDODefaultTransactionHandler,CDODefaultTransactionHandler1
- Enclosing interface:
- CDOTransactionHandler1
A call-back interface that is called by a
transaction before objects are
attached, modified, undone or detached.- Since:
- 4.6
- Author:
- Eike Stepper
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Nested Class Summary
Nested classes/interfaces inherited from interface org.eclipse.emf.cdo.transaction.CDOTransactionHandler1
CDOTransactionHandler1.WithUndo -
Method Summary
Modifier and TypeMethodDescriptionvoidundoingObject(CDOTransaction transaction, CDOObject object, CDOFeatureDelta featureDelta) Called by aCDOTransactionbefore an object is modified.Methods inherited from interface org.eclipse.emf.cdo.transaction.CDOTransactionHandler1
attachingObject, detachingObject, modifyingObject
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Method Details
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undoingObject
Called by aCDOTransactionbefore an object is modified. The implementor of this method is allowed to throw an unchecked exception that will propagate up to the operation that is about to modify the object (thereby preventing the operation from completing successfully).Note: Implementors must not start threads which access the
viewand wait for their completion since deadlocks can result. The following example causes a deadlock:
getDisplay().syncExec(new Runnable() { public void run() { try { cdoObject.getName(); } catch (Exception ignore) { } } });If you need to synchronously execute threads which access theviewyou should useCDOAsyncTransactionHandler.
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