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

Interface VersionedPersistentStore<V>

Type Parameters:

V -

All Superinterfaces:

AutoCloseable, Store<V>

All Known Implementing Classes:

UndefinedVersionDelegatingStore, VersionedDelegatingStore, ZookeeperPersistentStore

public interface VersionedPersistentStore<V>
extends Store<V>

Extension to the Store interface that supports versions

Method Summary

Modifier and Type	Method	Description
boolean	contains(String key, DataChangeVersion version)	Checks if lookup key is present in store.
V	get(String key, DataChangeVersion version)	Returns the value for the given key if exists, null otherwise.
void	put(String key, V value, DataChangeVersion version)	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,
 DataChangeVersion version)

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

Parameters:

key - lookup key

version - version holder

Returns:

true if store contains lookup key, false otherwise

get

V get(String key,
 DataChangeVersion version)

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

Parameters:

key - lookup key

version - version holder

put

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

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.

Parameters:

key - lookup key

value - value to store

version - version holder