org.apache.hadoop.hbase.security.visibility

Class VisibilityLabelsCache

java.lang.Object

org.apache.hadoop.hbase.security.visibility.VisibilityLabelsCache

All Implemented Interfaces:

VisibilityLabelOrdinalProvider

@InterfaceAudience.Private
public class VisibilityLabelsCache
extends Object
implements VisibilityLabelOrdinalProvider

Maintains the cache for visibility labels and also uses the zookeeper to update the labels in the system. The cache updation happens based on the data change event that happens on the zookeeper znode for labels table

Field Summary

Fields

Modifier and Type	Field and Description
private static List<String>	EMPTY_LIST
private static Set<Integer>	EMPTY_SET
private Map<String,Set<Integer>>	groupAuths
private static VisibilityLabelsCache	instance
private Map<String,Integer>	labels
private ReentrantReadWriteLock	lock This covers the members labels, ordinalVsLabels and userAuths
private static org.slf4j.Logger	LOG
private Map<Integer,String>	ordinalVsLabels
private Map<String,Set<Integer>>	userAuths
private ZKVisibilityLabelWatcher	zkVisibilityWatcher

Constructor Summary

Constructors

Modifier	Constructor and Description
private	VisibilityLabelsCache(ZKWatcher watcher, org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
static VisibilityLabelsCache	createAndGet(ZKWatcher watcher, org.apache.hadoop.conf.Configuration conf) Creates the singleton instance, if not yet present, and returns the same.
static VisibilityLabelsCache	get()
List<String>	getGroupAuths(String[] groups)
Set<Integer>	getGroupAuthsAsOrdinals(String[] groups) Returns the list of ordinals of labels associated with the groups n * @return the list of ordinals
String	getLabel(int ordinal) Returns the string associated with the ordinal.
int	getLabelOrdinal(String label)
int	getLabelsCount() Returns The total number of visibility labels.
List<String>	getUserAuths(String user)
Set<Integer>	getUserAuthsAsOrdinals(String user) Returns the list of ordinals of labels associated with the user
void	refreshLabelsCache(byte[] data)
void	refreshUserAuthsCache(byte[] data)
void	writeToZookeeper(byte[] data, boolean labelsOrUserAuths)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

private static final org.slf4j.Logger LOG

EMPTY_LIST

private static final List<String> EMPTY_LIST

EMPTY_SET

private static final Set<Integer> EMPTY_SET

instance

private static VisibilityLabelsCache instance

zkVisibilityWatcher

private ZKVisibilityLabelWatcher zkVisibilityWatcher

labels

private Map<String,Integer> labels

ordinalVsLabels

private Map<Integer,String> ordinalVsLabels

userAuths

private Map<String,Set<Integer>> userAuths

groupAuths

private Map<String,Set<Integer>> groupAuths

lock

private ReentrantReadWriteLock lock

This covers the members labels, ordinalVsLabels and userAuths

Constructor Detail

VisibilityLabelsCache

private VisibilityLabelsCache(ZKWatcher watcher,
                              org.apache.hadoop.conf.Configuration conf)
                       throws IOException

Throws:

IOException

Method Detail

createAndGet

public static VisibilityLabelsCache createAndGet(ZKWatcher watcher,
                                                 org.apache.hadoop.conf.Configuration conf)
                                          throws IOException

Creates the singleton instance, if not yet present, and returns the same. nn * @return Singleton instance of VisibilityLabelsCache n

Throws:

IOException

get

public static VisibilityLabelsCache get()

Returns:

Singleton instance of VisibilityLabelsCache n * when this is called before calling createAndGet(ZKWatcher, Configuration)

refreshLabelsCache

public void refreshLabelsCache(byte[] data)
                        throws IOException

Throws:

IOException

refreshUserAuthsCache

public void refreshUserAuthsCache(byte[] data)
                           throws IOException

Throws:

IOException

getLabelOrdinal

public int getLabelOrdinal(String label)

Specified by:

getLabelOrdinal in interface VisibilityLabelOrdinalProvider

Parameters:

label - Not null label string

Returns:

The ordinal for the label. The ordinal starts from 1. Returns 0 when passed a non existing label.

getLabel

public String getLabel(int ordinal)

Description copied from interface: VisibilityLabelOrdinalProvider

Returns the string associated with the ordinal. Not be used in MR.

Specified by:

getLabel in interface VisibilityLabelOrdinalProvider

Parameters:

ordinal - The ordinal of label which we are looking for.

Returns:

The label having the given ordinal. Returns null when no label exist in the system with given ordinal

getLabelsCount

public int getLabelsCount()

Returns The total number of visibility labels.

getUserAuths

public List<String> getUserAuths(String user)

getGroupAuths

public List<String> getGroupAuths(String[] groups)

getUserAuthsAsOrdinals

public Set<Integer> getUserAuthsAsOrdinals(String user)

Returns the list of ordinals of labels associated with the user

Parameters:

user - Not null value.

Returns:

the list of ordinals

getGroupAuthsAsOrdinals

public Set<Integer> getGroupAuthsAsOrdinals(String[] groups)

Returns the list of ordinals of labels associated with the groups n * @return the list of ordinals

writeToZookeeper

public void writeToZookeeper(byte[] data,
                             boolean labelsOrUserAuths)
                      throws IOException

Throws:

IOException