InboundChannelHandlerFactory (Flink : Runtime 2.1.0 API)

```
@Experimental
public interface InboundChannelHandlerFactory
```
Custom netty inbound handler factory in order to make custom changes on netty inbound data. Good example usage of this API is custom authentication. When the user is not authenticated then the instantiated channel handler can send back 401 to trigger negotiation. Since implementations are loaded with service loader it's discouraged to store any internal state in factories.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Optional<org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler>`	`createHandler(org.apache.flink.configuration.Configuration configuration, Map<String,String> responseHeaders)`	Creates new instance of `ChannelHandler`
`int`	`priority()`	Gives back priority of the `ChannelHandler`.

- Method Detail
  - priority
```
int priority()
```
    Gives back priority of the ChannelHandler. The bigger the value is, the earlier it is executed. If multiple handlers have the same priority then the order is not defined.
    
    Returns:
    
    the priority of the ChannelHandler.
  - createHandler
```
Optional<org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler> createHandler(org.apache.flink.configuration.Configuration configuration,
                                                                                       Map<String,String> responseHeaders)
                                                                                throws org.apache.flink.util.ConfigurationException
```
    Creates new instance of ChannelHandler
    
    Parameters:
    
    configuration - The Flink Configuration.
    
    responseHeaders - The response headers.
    
    Returns:
    
    ChannelHandler or null if no custom handler need to be created.
    
    Throws:
    
    org.apache.flink.util.ConfigurationException - Thrown, if the handler configuration is incorrect.