ProxyCallback (Red Hat JBoss Enterprise Application Platform 8.0.0.Beta public API)

```
public interface ProxyCallback<T>
```
Yet another callback class, this one used by the proxy handler

Author:

Stuart Douglas

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`completed(HttpServerExchange exchange, T result)`
`void`	`couldNotResolveBackend(HttpServerExchange exchange)`	Callback if no backend server could be found.
`void`	`failed(HttpServerExchange exchange)`	Callback if establishing the connection to a backend server fails.
`void`	`queuedRequestFailed(HttpServerExchange exchange)`	This is invoked when the target connection pool transitions to problem status.

- Method Detail
  - completed
```
void completed(HttpServerExchange exchange,
               T result)
```
  - failed
```
void failed(HttpServerExchange exchange)
```
    Callback if establishing the connection to a backend server fails.
    
    Parameters:
    
    exchange - the http server exchange
  - couldNotResolveBackend
```
void couldNotResolveBackend(HttpServerExchange exchange)
```
    Callback if no backend server could be found.
    
    Parameters:
    
    exchange - the http server exchange
  - queuedRequestFailed
```
void queuedRequestFailed(HttpServerExchange exchange)
```
    This is invoked when the target connection pool transitions to problem status. It will be called once for each queued request that has not yet been allocated a connection. The manager can redistribute these requests to other hosts, or can end the exchange with an error status.
    
    Parameters:
    
    exchange - The exchange