IExtensionChangeHandler (Eclipse Platform API Specification)

```
public interface IExtensionChangeHandler
```
Extension change handlers are notified of changes for a given extension point in the context of an extension tracker.
This interface can be used without OSGi running.
This interface is intended to be implemented by clients.

Since:

3.1

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addExtension(IExtensionTracker tracker, IExtension extension)`	This method is called whenever an extension conforming to the extension point filter is being added to the registry.
`void`	`removeExtension(IExtension extension, Object[] objects)`	This method is called after the removal of an extension.

- Method Detail
  - addExtension
```
void addExtension(IExtensionTracker tracker,
                  IExtension extension)
```
    This method is called whenever an extension conforming to the extension point filter is being added to the registry. This method does not automatically register objects to the tracker.
    
    Parameters:
    
    tracker - a tracker to which the handler has been registered
    
    extension - the extension being added
  - removeExtension
```
void removeExtension(IExtension extension,
                     Object[] objects)
```
    This method is called after the removal of an extension.
    
    Parameters:
    
    extension - the extension being removed
    
    objects - the objects that were associated with the removed extension