Watcher (Apache BookKeeper :: Parent 4.18.0-SNAPSHOT API)

All Known Implementing Classes:

LongPollReadEntryProcessorV3
```
public interface Watcher<T>
```
A class can implement the Watcher interface when it wants to be informed of one-time changes in watchable objects.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void update(T value)
  This method is called whenever the watched object is changed.

- Method Detail
  - update
```
void update(T value)
```
    This method is called whenever the watched object is changed. An application calls an Watchable object's notifyWatchers method to have all the object's watchers notified of the change.
    
    Parameters:
    
    value - the updated value of a watchable