AlternateRackDNSToSwitchMapping (Storm 2.7.1 API)

java.lang.Object
- org.apache.storm.networktopography.AbstractDNSToSwitchMapping
- - org.apache.storm.testing.AlternateRackDNSToSwitchMapping

All Implemented Interfaces:

DNSToSwitchMapping
```
public final class AlternateRackDNSToSwitchMapping
extends AbstractDNSToSwitchMapping
```
This class implements the DNSToSwitchMapping interface It alternates bewteen RACK1 and RACK2 for the hosts.

Field Summary
- Fields inherited from interface org.apache.storm.networktopography.DNSToSwitchMapping
  DEFAULT_RACK

Constructor Summary

Constructors
Constructor Description

AlternateRackDNSToSwitchMapping()

Method Summary

All Methods Instance Methods Concrete 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).
`String`	`toString()`

Methods inherited from class org.apache.storm.networktopography.AbstractDNSToSwitchMapping
dumpTopology, getSwitchMap, isSingleSwitch

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - AlternateRackDNSToSwitchMapping
```
public AlternateRackDNSToSwitchMapping()
```
- Method Detail
  - resolve
```
public Map<String,String> resolve(List<String> names)
```
    Description copied from interface: DNSToSwitchMapping
    
    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
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object