org.apache.drill.exec.store.sys.store

Class ZookeeperPersistentStore<V>

java.lang.Object

org.apache.drill.exec.store.sys.BasePersistentStore<V>

org.apache.drill.exec.store.sys.store.ZookeeperPersistentStore<V>

All Implemented Interfaces:

AutoCloseable, PersistentStore<V>, Store<V>, VersionedPersistentStore<V>

public class ZookeeperPersistentStore<V>
extends BasePersistentStore<V>
implements VersionedPersistentStore<V>

Zookeeper based implementation of PersistentStore.

Constructor Summary

Constructors

Constructor and Description
ZookeeperPersistentStore(org.apache.curator.framework.CuratorFramework framework, PersistentStoreConfig<V> config)

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	contains(String key) Checks if lookup key is present in store.
boolean	contains(String key, DataChangeVersion version) Checks if lookup key is present in store.
void	delete(String key) Removes the value corresponding to the given key if exists, nothing happens otherwise.
V	get(String key) Returns the value for the given key if exists, null otherwise.
V	get(String key, boolean consistencyFlag, DataChangeVersion version)
V	get(String key, DataChangeVersion version) Returns the value for the given key if exists, null otherwise.
PersistentStoreMode	getMode() Returns storage mode of this store.
Iterator<Map.Entry<String,V>>	getRange(int skip, int take) Returns an iterator of desired number of entries offsetting by the skip value.
void	put(String key, V value) Stores the (key, value) tuple in the store.
void	put(String key, V value, DataChangeVersion version) Stores the (key, value) tuple in the store.
boolean	putIfAbsent(String key, V value) Stores the (key, value) tuple in the store only if it does not exists.
void	start()

Methods inherited from class org.apache.drill.exec.store.sys.BasePersistentStore

getAll

Methods inherited from class java.lang.Object

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

Constructor Detail

ZookeeperPersistentStore

public ZookeeperPersistentStore(org.apache.curator.framework.CuratorFramework framework,
                                PersistentStoreConfig<V> config)
                         throws StoreException

Throws:

StoreException

Method Detail

start

public void start()
           throws Exception

Throws:

Exception

getMode

public PersistentStoreMode getMode()

Description copied from interface: Store

Returns storage mode of this store.

Specified by:

getMode in interface Store<V>

contains

public boolean contains(String key)

Description copied from interface: PersistentStore

Checks if lookup key is present in store.

Specified by:

contains in interface PersistentStore<V>

Parameters:

key - lookup key

Returns:

true if store contains lookup key, false otherwise

contains

public boolean contains(String key,
                        DataChangeVersion version)

Description copied from interface: VersionedPersistentStore

Checks if lookup key is present in store. Sets data change version number.

Specified by:

contains in interface VersionedPersistentStore<V>

Parameters:

key - lookup key

version - version holder

Returns:

true if store contains lookup key, false otherwise

get

public V get(String key)

Description copied from interface: PersistentStore

Returns the value for the given key if exists, null otherwise.

Specified by:

get in interface PersistentStore<V>

Parameters:

key - lookup key

get

public V get(String key,
             DataChangeVersion version)

Description copied from interface: VersionedPersistentStore

Returns the value for the given key if exists, null otherwise. Sets data change version number.

Specified by:

get in interface VersionedPersistentStore<V>

Parameters:

key - lookup key

version - version holder

get

public V get(String key,
             boolean consistencyFlag,
             DataChangeVersion version)

put

public void put(String key,
                V value)

Description copied from interface: PersistentStore

Stores the (key, value) tuple in the store. Lifetime of the tuple depends upon store mode.

Specified by:

put in interface PersistentStore<V>

Parameters:

key - lookup key

value - value to store

put

public void put(String key,
                V value,
                DataChangeVersion version)

Description copied from interface: VersionedPersistentStore

Stores the (key, value) tuple in the store. If tuple already exits, stores it only if versions match, otherwise throws VersionMismatchException Lifetime of the tuple depends upon store mode.

Specified by:

put in interface VersionedPersistentStore<V>

Parameters:

key - lookup key

value - value to store

version - version holder

putIfAbsent

public boolean putIfAbsent(String key,
                           V value)

Description copied from interface: Store

Stores the (key, value) tuple in the store only if it does not exists.

Specified by:

putIfAbsent in interface Store<V>

Parameters:

key - lookup key

value - value to store

Returns:

true if put takes place, false otherwise.

delete

public void delete(String key)

Description copied from interface: Store

Removes the value corresponding to the given key if exists, nothing happens otherwise.

Specified by:

delete in interface Store<V>

Parameters:

key - lookup key

getRange

public Iterator<Map.Entry<String,V>> getRange(int skip,
                                              int take)

Description copied from interface: Store

Returns an iterator of desired number of entries offsetting by the skip value.

Specified by:

getRange in interface Store<V>

Parameters:

skip - number of records to skip from beginning

take - max number of records to return

close

public void close()

Specified by:

close in interface AutoCloseable