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


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