org.apache.drill.exec.store.sys

Interface Store<V>

Type Parameters:

V - value type

All Superinterfaces:

AutoCloseable

All Known Subinterfaces:

PersistentStore<V>, VersionedPersistentStore<V>

All Known Implementing Classes:

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

public interface Store<V>
extends AutoCloseable

A Store interface used to store and retrieve instances of given value type.

Method Summary

Modifier and Type	Method and Description
void	delete(String key) Removes the value corresponding to the given key if exists, nothing happens 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.
boolean	putIfAbsent(String key, V value) Stores the (key, value) tuple in the store only if it does not exists.

Methods inherited from interface java.lang.AutoCloseable

close

Method Detail

getMode

PersistentStoreMode getMode()

Returns storage mode of this store.

delete

void delete(String key)

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

Parameters:

key - lookup key

putIfAbsent

boolean putIfAbsent(String key,
                    V value)

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

Parameters:

key - lookup key

value - value to store

Returns:

true if put takes place, false otherwise.

getRange

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

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

Parameters:

skip - number of records to skip from beginning

take - max number of records to return