TargetWatcher (jrt 7.265.10 API)

```
public interface TargetWatcher
```
Interface used to notify when a Target becomes invalid. Listening is controlled with the Target.addWatcher and Target.removeWatcher methods.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void notifyTargetInvalid(Target target)
  Invoked when a target becomes invalid.

- Method Detail
  - notifyTargetInvalid
```
void notifyTargetInvalid(Target target)
```
    Invoked when a target becomes invalid.
    
    Parameters:
    
    target - the target that has become invalid.