org.apache.hadoop.security
Interface GroupMappingServiceProvider

@InterfaceAudience.Public
@InterfaceStability.Evolving
public interface GroupMappingServiceProvider

An interface for the implementation of a user-to-groups mapping service used by Groups.

Method Summary

void	cacheGroupsAdd(List<String> groups) Caches the group user information
void	cacheGroupsRefresh() Refresh the cache of groups and user mapping
List<String>	getGroups(String user) Get all various group memberships of a given user.

Method Detail

getGroups

List<String> getGroups(String user)
                       throws IOException

Get all various group memberships of a given user. Returns EMPTY list in case of non-existing user

Parameters:

user - User's name

Returns:

group memberships of user

Throws:

IOException

cacheGroupsRefresh

void cacheGroupsRefresh()
                        throws IOException

Refresh the cache of groups and user mapping

Throws:

IOException

cacheGroupsAdd

void cacheGroupsAdd(List<String> groups)
                    throws IOException

Caches the group user information

Parameters:

groups - list of groups to add to cache

Throws:

IOException