DerbyObserver (Apache Derby V10.14 Internals)

All Known Implementing Classes:

AllocPage, BaseContainerHandle, BasePage, CachedPage, ContainerActionOnCommit, ContainerHandleActionOnCommit, DropOnCommit, StoredPage, StreamFileContainerHandle, SyncOnCommit, TruncateOnCommit
```
public interface DerbyObserver
```
Created to provide the Observable behavior which Derby has depended on since Java 1.2 but which as deprecated in JDK 9 build 118. A DerbyObserver is an object which registers it interest in being notified when events occur.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`update(DerbyObservable observable, java.lang.Object extraInfo)`	This is the callback method which is invoked when a change happens to the object which is being observed.

- Method Detail
  - update
```
void update(DerbyObservable observable,
            java.lang.Object extraInfo)
```
    This is the callback method which is invoked when a change happens to the object which is being observed.
    
    Parameters:
    
    observable - The object which is being observed
    
    extraInfo - Extra information being passed to the callback