TransactionListener (Apache Derby V10.14 Internals)

```
public interface TransactionListener
```
An interface that must be implemented by a object that wants to be notified when a significant transaction event occurs.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`preCommit()`	Notifies registered listener that the transaction is about to commit.
`void`	`preRollback()`	Notifies registered listener that the transaction is about to rollback.

- Method Detail
  - preCommit
```
boolean preCommit()
           throws StandardException
```
    Notifies registered listener that the transaction is about to commit. Called before the commit is recorded and flushed to the transaction log device.
    
    Returns:
    
    true to remove this listener once this method returns.
    
    Throws:
    
    StandardException - If thrown the commit attempt will be stopped and instead the transaction will be rolled back.
  - preRollback
```
void preRollback()
          throws StandardException
```
    Notifies registered listener that the transaction is about to rollback. Called before any physical rollback. The listener will be removed from the current transaction once the method returns.
    
    Throws:
    
    StandardException - If thrown the rollback attempt will be stopped and instead the database will be shut down. TODO: Define behaviour on exception during rollback.