IBeliefListener (Jadex Active Component Platform 4.0.177 API)

```
public interface IBeliefListener<T>
```
Listener for observing beliefs.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`beliefChanged(ChangeInfo<T> info)`	Invoked when a belief has been changed.
`void`	`factAdded(ChangeInfo<T> info)`	Invoked when a fact has been added.
`void`	`factChanged(ChangeInfo<T> info)`	Invoked when a fact in a belief set has changed (i.e. bean event).
`void`	`factRemoved(ChangeInfo<T> info)`	Invoked when a fact has been removed.

- Method Detail
  - beliefChanged
```
void beliefChanged(ChangeInfo<T> info)
```
    Invoked when a belief has been changed.
    
    Parameters:
    
    event - The change event.
  - factAdded
```
void factAdded(ChangeInfo<T> info)
```
    Invoked when a fact has been added. The new fact is contained in the agent event.
    
    Parameters:
    
    event - The change event.
  - factRemoved
```
void factRemoved(ChangeInfo<T> info)
```
    Invoked when a fact has been removed. The removed fact is contained in the agent event.
    
    Parameters:
    
    event - The change event.
  - factChanged
```
void factChanged(ChangeInfo<T> info)
```
    Invoked when a fact in a belief set has changed (i.e. bean event).
    
    Parameters:
    
    value - The new value.
    
    oldvalue - The old value.
    
    info - Extra info (such as the index of the element if applicable).