EventHandler

```
public interface EventHandler
```
Interface which defines 2 callbacks: up() and down(). An EventHandler can be installed in SUPERVISOR by a rule which requires callbacks when an event is passed up or down the stack.

Since:

3.3

Author:

Bela Ban

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Object`	`down(Event evt)`	Called when a down event is received
`java.lang.Object`	`down(Message msg)`
`java.lang.Object`	`up(Event evt)`	Called when an up event is received
`java.lang.Object`	`up(Message msg)`

Method Detail

up
```
java.lang.Object up(Event evt)
             throws java.lang.Throwable
```
Called when an up event is received

Parameters:

evt - The event

Returns:

Ignored

Throws:

java.lang.Throwable

up

java.lang.Object up(Message msg)
             throws java.lang.Throwable

Throws:: java.lang.Throwable

down
```
java.lang.Object down(Event evt)
               throws java.lang.Throwable
```
Called when a down event is received

Parameters:

evt - The event

Returns:

Ignored

Throws:

java.lang.Throwable

down

java.lang.Object down(Message msg)
               throws java.lang.Throwable

Throws:: java.lang.Throwable