Package org.apache.hadoop.security

Class NetgroupCache

java.lang.Object

org.apache.hadoop.security.NetgroupCache

@LimitedPrivate({"HDFS","MapReduce"})
@Unstable
public class NetgroupCache
extends java.lang.Object

Class that caches the netgroups and inverts group-to-user map to user-to-group map, primarily intended for use with netgroups (as returned by getent netgrgoup) which only returns group to user mapping.

Constructor Summary

Constructors

Constructor	Description
NetgroupCache()

Method Summary

Modifier and Type	Method	Description
static void	add(java.lang.String group, java.util.List<java.lang.String> users)	Add group to cache
static void	clear()	Clear the cache
static java.util.List<java.lang.String>	getNetgroupNames()	Get the list of cached netgroups
static void	getNetgroups(java.lang.String user, java.util.List<java.lang.String> groups)	Get netgroups for a given user
static boolean	isCached(java.lang.String group)	Returns true if a given netgroup is cached

Methods inherited from class java.lang.Object

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

Constructor Detail

NetgroupCache

public NetgroupCache()

Method Detail

getNetgroups

public static void getNetgroups(java.lang.String user,
                                java.util.List<java.lang.String> groups)

Get netgroups for a given user

Parameters:

user - get groups for this user

groups - put groups into this List

getNetgroupNames

public static java.util.List<java.lang.String> getNetgroupNames()

Get the list of cached netgroups

Returns:

list of cached groups

isCached

public static boolean isCached(java.lang.String group)

Returns true if a given netgroup is cached

Parameters:

group - check if this group is cached

Returns:

true if group is cached, false otherwise

clear

public static void clear()

Clear the cache

add

public static void add(java.lang.String group,
                       java.util.List<java.lang.String> users)

Add group to cache

Parameters:

group - name of the group to add to cache

users - list of users for a given group