org.apache.drill.exec.coord.local

Class MapBackedStore<V>

java.lang.Object

org.apache.drill.exec.coord.store.BaseTransientStore<V>

org.apache.drill.exec.coord.local.MapBackedStore<V>

All Implemented Interfaces:

AutoCloseable, TransientStore<V>

public class MapBackedStore<V>
extends BaseTransientStore<V>

Field Summary

Fields inherited from class org.apache.drill.exec.coord.store.BaseTransientStore

config

Constructor Summary

Constructors

Constructor and Description
MapBackedStore(TransientStoreConfig<V> config)

Method Summary

Modifier and Type	Method and Description
void	close()
Iterator<Map.Entry<String,V>>	entries() Returns an iterator of (key, value) tuples.
V	get(String key) Returns a value corresponding to the given look-up key if exists, null otherwise.
V	put(String key, V value) Stores the given (key, value) in this store overriding the existing value.
V	putIfAbsent(String key, V value) Stores the given (key, value) tuple in this store only if it does not exists.
V	remove(String key) Removes the (key, value) tuple from this store if the key exists.
int	size() Returns number of entries.

Methods inherited from class org.apache.drill.exec.coord.store.BaseTransientStore

addListener, fireListeners, getConfig, keys, removeListener, values

Methods inherited from class java.lang.Object

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

Constructor Detail

MapBackedStore

public MapBackedStore(TransientStoreConfig<V> config)

Method Detail

get

public V get(String key)

Description copied from interface: TransientStore

Returns a value corresponding to the given look-up key if exists, null otherwise.

Parameters:

key - look-up key

put

public V put(String key,
             V value)

Description copied from interface: TransientStore

Stores the given (key, value) in this store overriding the existing value.

Parameters:

key - look-up key

value - value to store

Returns:

the old value if the key exists, null otherwise

putIfAbsent

public V putIfAbsent(String key,
                     V value)

Description copied from interface: TransientStore

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

Parameters:

key - look-up key

value - value to store

Returns:

the old value if the key exists, null otherwise

remove

public V remove(String key)

Description copied from interface: TransientStore

Removes the (key, value) tuple from this store if the key exists.

Parameters:

key - look-up key

Returns:

the removed value if key exists, null otherwise

entries

public Iterator<Map.Entry<String,V>> entries()

Description copied from interface: TransientStore

Returns an iterator of (key, value) tuples.

size

public int size()

Description copied from interface: TransientStore

Returns number of entries.

close

public void close()
           throws Exception

Throws:

Exception