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

Interface PersistentStore<V>

Type Parameters:

V - value type

All Superinterfaces:

AutoCloseable, Store<V>

All Known Implementing Classes:

BasePersistentStore, CaseInsensitivePersistentStore, HBasePersistentStore, InMemoryStore, LocalPersistentStore, MongoPersistentStore, NoWriteLocalStore, ZookeeperPersistentStore

public interface PersistentStore<V>
extends Store<V>

Stores and retrieve instances of given value type.

Method Summary

Modifier and Type	Method	Description
boolean	contains(String key)	Checks if lookup key is present in store.
V	get(String key)	Returns the value for the given key if exists, null otherwise.
Iterator<Map.Entry<String,V>>	getAll()	Returns an iterator of entries.
void	put(String key, V value)	Stores the (key, value) tuple in the store.

Methods inherited from interface java.lang.AutoCloseable

close

Methods inherited from interface org.apache.drill.exec.store.sys.Store

delete, getMode, getRange, putIfAbsent

Method Details

contains

boolean contains(String key)

Checks if lookup key is present in store.

Parameters:

key - lookup key

Returns:

true if store contains lookup key, false otherwise

get

V get(String key)

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

Parameters:

key - lookup key

put

void put(String key,
 V value)

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

Parameters:

key - lookup key

value - value to store

getAll

Iterator<Map.Entry<String,V>> getAll()

Returns an iterator of entries.