org.eclipse.emf.cdo.transaction
Interface CDOTransactionHandler

All Known Implementing Classes:

CDOAsyncTransactionHandler, CDOAutoAttacher, CDODefaultTransactionHandler

public interface CDOTransactionHandler

Since:

2.0

Method Summary

void	attachingObject(CDOTransaction transaction, CDOObject object) Called by a CDOTransaction before an object is added.
void	committedTransaction(CDOTransaction transaction, CDOCommitContext commitContext) Called by a CDOTransaction after it is being committed.
void	committingTransaction(CDOTransaction transaction, CDOCommitContext commitContext) Called by a CDOTransaction before it is being committed.
void	detachingObject(CDOTransaction transaction, CDOObject object) Called by a CDOTransaction before an object is detached.
void	modifyingObject(CDOTransaction transaction, CDOObject object, CDOFeatureDelta featureDelta) Called by a CDOTransaction before an object is modified.
void	rolledBackTransaction(CDOTransaction transaction) Called by a CDOTransaction after it is rolled back.

Method Detail

attachingObject

void attachingObject(CDOTransaction transaction,
                     CDOObject object)

Called by a CDOTransaction before an object is added. The implementor of this method is allowed to throw an unchecked exception that will propagate up to the operation that is about to add the object (thereby preventing the operation from successful completion).

Note: Implementors must not start threads which access the view and 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 the view you should use CDOAsyncTransactionHandler.

detachingObject

void detachingObject(CDOTransaction transaction,
                     CDOObject object)

Called by a CDOTransaction before an object is detached. The implementor of this method is allowed to throw an unchecked exception that will propagate up to the operation that is about to remove the object (thereby preventing the operation from completing successfully).

Note: Implementors must not start threads which access the view and 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 the view you should use CDOAsyncTransactionHandler.

modifyingObject

void modifyingObject(CDOTransaction transaction,
                     CDOObject object,
                     CDOFeatureDelta featureDelta)

Called by a CDOTransaction before 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 view and 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 the view you should use CDOAsyncTransactionHandler.

committingTransaction

void committingTransaction(CDOTransaction transaction,
                           CDOCommitContext commitContext)

Called by a CDOTransaction before it is being committed. The implementor of this method is allowed to throw an unchecked exception that will propagate up to the operation that is about to commit the transaction (thereby preventing the operation from completing successfully).

committedTransaction

void committedTransaction(CDOTransaction transaction,
                          CDOCommitContext commitContext)

Called by a CDOTransaction after it is being committed. The implementor of this method is not allowed to throw an unchecked exception.

rolledBackTransaction

void rolledBackTransaction(CDOTransaction transaction)

Called by a CDOTransaction after it is rolled back. If the implementor of this method throws an exception it will be logged as an error and subsequent handlers will be further called.