OutHandler

All Known Implementing Classes:

AbstractInOutHandler, AbstractOutHandler, GraphStageLogic.ConditionalTerminateOutput, GraphStageLogic.EagerTerminateOutput$, GraphStageLogic.IgnoreTerminateOutput$
```
public interface OutHandler
```
Collection of callbacks for an output port of a GraphStage

Method Summary

All Methods Instance Methods Abstract Methods Deprecated Methods
Modifier and Type	Method	Description
`void`	`onDownstreamFinish()`	Deprecated. Call onDownstreamFinish with a cancellation cause.
`void`	`onDownstreamFinish(java.lang.Throwable cause)`	Called when the output port will no longer accept any new elements.
`void`	`onPull()`	Called when the output port has received a pull, and therefore ready to emit an element, i.e.

- Method Detail
  - onDownstreamFinish
```
void onDownstreamFinish()
                 throws java.lang.Exception
```
    Deprecated.
    Call onDownstreamFinish with a cancellation cause. Since 2.6.0.
    
    Called when the output port will no longer accept any new elements. After this callback no other callbacks will be called for this port.
    
    Throws:
    
    java.lang.Exception
  - onDownstreamFinish
```
void onDownstreamFinish(java.lang.Throwable cause)
                 throws java.lang.Exception
```
    Called when the output port will no longer accept any new elements. After this callback no other callbacks will be called for this port.
    
    Throws:
    
    java.lang.Exception
  - onPull
```
void onPull()
     throws java.lang.Exception
```
    Called when the output port has received a pull, and therefore ready to emit an element, i.e. GraphStageLogic.push is now allowed to be called on this port.
    
    Throws:
    
    java.lang.Exception