org.apache.hadoop.security
Class JniBasedUnixGroupsMapping

java.lang.Object
  org.apache.hadoop.security.JniBasedUnixGroupsMapping

Direct Known Subclasses:

JniBasedUnixGroupsNetgroupMapping

public class JniBasedUnixGroupsMapping
extends Object

A JNI-based implementation of GroupMappingServiceProvider that invokes libC calls to get the group memberships of a given user.

Constructor Summary

JniBasedUnixGroupsMapping()

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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JniBasedUnixGroupsMapping

public JniBasedUnixGroupsMapping()

Method Detail

getGroups

public 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

public void cacheGroupsRefresh()
                        throws IOException

Refresh the cache of groups and user mapping

Throws:

IOException

cacheGroupsAdd

public void cacheGroupsAdd(List<String> groups)
                    throws IOException

Caches the group user information

Parameters:

groups - list of groups to add to cache

Throws:

IOException