InHandler

All Known Implementing Classes:

AbstractInHandler, AbstractInOutHandler, GraphStageLogic.ConditionalTerminateInput, GraphStageLogic.EagerTerminateInput$, GraphStageLogic.IgnoreTerminateInput$, GraphStageLogic.TotallyIgnorantInput$
```
public interface InHandler
```
Collection of callbacks for an input port of a GraphStage

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onPush()`	Called when the input port has a new element available.
`void`	`onUpstreamFailure(java.lang.Throwable ex)`	Called when the input port has failed.
`void`	`onUpstreamFinish()`	Called when the input port is finished.

- Method Detail
  - onPush
```
void onPush()
     throws java.lang.Exception
```
    Called when the input port has a new element available. The actual element can be retrieved via the GraphStageLogic.grab method.
    
    Throws:
    
    java.lang.Exception
  - onUpstreamFailure
```
void onUpstreamFailure(java.lang.Throwable ex)
                throws java.lang.Exception
```
    Called when the input port has failed. After this callback no other callbacks will be called for this port.
    
    Throws:
    
    java.lang.Exception
  - onUpstreamFinish
```
void onUpstreamFinish()
               throws java.lang.Exception
```
    Called when the input port is finished. After this callback no other callbacks will be called for this port.
    
    Throws:
    
    java.lang.Exception