```
public final class RouteDatabase
extends Object
```
A blacklist of failed routes to avoid when creating a new connection to a target address. This is used so that OkHttp can learn from its mistakes: if there was a failure attempting to connect to a specific IP address or proxy server, that failure is remembered and alternate routes are preferred.

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`connected(Route route)`	Records success connecting to `failedRoute`.
`void`	`failed(Route failedRoute)`	Records a failure connecting to `failedRoute`.
`int`	`failedRoutesCount()`
`boolean`	`shouldPostpone(Route route)`	Returns true if `route` has failed recently and should be avoided.

Class RouteDatabase