IPrincipalToLocal (Storm 2.7.1 API)

All Known Implementing Classes:

DefaultPrincipalToLocal, KerberosPrincipalToLocal, X509CertOrKerberosPrincipalToLocal, X509CertPrincipalToLocal
```
public interface IPrincipalToLocal
```
Storm can be configured to launch worker processed as a given user. Some transports need to map the Principal to a local user name.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`void`	`prepare(Map<String,Object> topoConf)`	Invoked once immediately after construction.
`String`	`toLocal(String principalName)`
`default String`	`toLocal(Principal principal)`	Convert a Principal to a local user name.

- Method Detail
  - prepare
```
void prepare(Map<String,Object> topoConf)
```
    Invoked once immediately after construction.
    
    Parameters:
    
    topoConf - Storm configuration
  - toLocal
```
default String toLocal(Principal principal)
```
    Convert a Principal to a local user name.
    
    Parameters:
    
    principal - the principal to convert
    
    Returns:
    
    The local user name.
  - toLocal
```
String toLocal(String principalName)
```