org.apache.hadoop.hive.metastore.properties

Class CachingPropertyStore

java.lang.Object

org.apache.hadoop.hive.metastore.properties.PropertyStore

org.apache.hadoop.hive.metastore.properties.CachingPropertyStore

public class CachingPropertyStore
extends PropertyStore

A property map store using a pull-thru cache.

Before a map is returned, a check against the stored corresponding digest is performed to avoid using stale data.

Field Summary

Fields

Modifier and Type	Field and Description
protected SoftCache<String,PropertyMap>	maps
protected PropertyStore	store

Constructor Summary

Constructors

Constructor and Description
CachingPropertyStore(PropertyStore wrap)
CachingPropertyStore(PropertyStore wrap, org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
void	clearCache()
protected boolean	dropProperties(String mapKey) Drops a property map.
UUID	fetchDigest(String mapKey) Fetches a property map digest.
PropertyMap	fetchProperties(String mapKey, Function<String,PropertySchema> getSchema) Fetches a property map.
boolean	renameProperties(String mapKey, String newKey) Renames a property map.
void	saveProperties(String mapKey, PropertyMap map) Persists a property map.
Map<String,UUID>	selectDigest(String keyPrefix, Predicate<String> keyFilter) Fetches a map of property maps digest keyed by their name.
Map<String,PropertyMap>	selectProperties(String keyPrefix, Predicate<String> keyFilter, Function<String,PropertySchema> getSchema) Fetches a map of property maps.

Methods inherited from class org.apache.hadoop.hive.metastore.properties.PropertyStore

deserialize, saveProperties, serialize

Methods inherited from class java.lang.Object

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

Field Detail

maps

protected final SoftCache<String,PropertyMap> maps

store

protected final PropertyStore store

Constructor Detail

CachingPropertyStore

public CachingPropertyStore(PropertyStore wrap)

CachingPropertyStore

public CachingPropertyStore(PropertyStore wrap,
                            org.apache.hadoop.conf.Configuration conf)

Method Detail

clearCache

public void clearCache()

fetchDigest

public UUID fetchDigest(String mapKey)

Description copied from class: PropertyStore

Fetches a property map digest.

Specified by:

fetchDigest in class PropertyStore

Parameters:

mapKey - the map key

Returns:

the item property map

selectDigest

public Map<String,UUID> selectDigest(String keyPrefix,
                                     Predicate<String> keyFilter)

Description copied from class: PropertyStore

Fetches a map of property maps digest keyed by their name.

Specified by:

selectDigest in class PropertyStore

Parameters:

keyPrefix - the map key prefix

keyFilter - a filter for map keys

Returns:

the map of property map digests

fetchProperties

public PropertyMap fetchProperties(String mapKey,
                                   Function<String,PropertySchema> getSchema)

Description copied from class: PropertyStore

Fetches a property map.

Specified by:

fetchProperties in class PropertyStore

Parameters:

mapKey - the map key

getSchema - the method to retrieve a schema if the map needs to be created

Returns:

the item property map

selectProperties

public Map<String,PropertyMap> selectProperties(String keyPrefix,
                                                Predicate<String> keyFilter,
                                                Function<String,PropertySchema> getSchema)

Description copied from class: PropertyStore

Fetches a map of property maps.

Specified by:

selectProperties in class PropertyStore

Parameters:

keyPrefix - the map key prefix

keyFilter - a filter for map keys

getSchema - the method to retrieve a schema if the map needs to be created

Returns:

the map of property map

saveProperties

public void saveProperties(String mapKey,
                           PropertyMap map)

Description copied from class: PropertyStore

Persists a property map.

Specified by:

saveProperties in class PropertyStore

Parameters:

mapKey - the map key

map - the map instance

dropProperties

protected boolean dropProperties(String mapKey)

Description copied from class: PropertyStore

Drops a property map.

Specified by:

dropProperties in class PropertyStore

Parameters:

mapKey - the map key

renameProperties

public boolean renameProperties(String mapKey,
                                String newKey)

Description copied from class: PropertyStore

Renames a property map.

Specified by:

renameProperties in class PropertyStore

Parameters:

mapKey - the map source key

newKey - the new target key