JdkApplicationProtocolNegotiator.ProtocolSelector (Netty API Reference (4.2.7.Final))

Enclosing interface:

JdkApplicationProtocolNegotiator
```
public static interface JdkApplicationProtocolNegotiator.ProtocolSelector
```
Interface to define the role of an application protocol selector in the SSL handshake process. Either unsupported() OR select(List) will be called for each SSL handshake.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`select(java.util.List<java.lang.String> protocols)`	Callback invoked to select the application level protocol from the `protocols` provided.
`void`	`unsupported()`	Callback invoked to let the application know that the peer does not support this `ApplicationProtocolNegotiator`.

- Method Detail
  - unsupported
```
void unsupported()
```
    Callback invoked to let the application know that the peer does not support this ApplicationProtocolNegotiator.
  - select
```
java.lang.String select(java.util.List<java.lang.String> protocols)
                 throws java.lang.Exception
```
    Callback invoked to select the application level protocol from the protocols provided.
    
    Parameters:
    
    protocols - the protocols sent by the protocol advertiser
    
    Returns:
    
    the protocol selected by this JdkApplicationProtocolNegotiator.ProtocolSelector. A null value will indicate the no protocols were selected but the handshake should not fail. The decision to fail the handshake is left to the other end negotiating the SSL handshake.
    
    Throws:
    
    java.lang.Exception - If the protocols provide warrant failing the SSL handshake with a fatal alert.