DNSToSwitchMapping (Storm 2.7.1 API)

All Known Implementing Classes:

AbstractDNSToSwitchMapping, AlternateRackDNSToSwitchMapping, DefaultRackDNSToSwitchMapping
```
public interface DNSToSwitchMapping
```
An interface that must be implemented to allow pluggable DNS-name/IP-address to RackID resolvers.

Field Summary

Fields
Modifier and Type Field Description

static String DEFAULT_RACK

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Map<String,String>`	`resolve(List<String> names)`	Resolves a list of DNS-names/IP-address and returns back a map of DNS-name->switch information ( network paths).

- Field Detail
  - DEFAULT_RACK
```
static final String DEFAULT_RACK
```
    See Also:
    
    Constant Field Values
- Method Detail
  - resolve
```
Map<String,String> resolve(List<String> names)
```
    Resolves a list of DNS-names/IP-address and returns back a map of DNS-name->switch information ( network paths). Consider an element in the argument list - x.y.com. The switch information that is returned must be a network path of the form /foo/rack, where / is the root, and 'foo' is the switch where 'rack' is connected. Note the hostname/ip-address is not part of the returned path. The network topology of the cluster would determine the number of components in the network path.
    If a name cannot be resolved to a rack, the implementation should return {DEFAULT_RACK}. This is what the bundled implementations do, though it is not a formal requirement.
    
    Parameters:
    
    names - the list of hosts to resolve (can be empty)
    
    Returns:
    
    Map of hosts to resolved network paths. If names is empty, then return empty Map