Interface ConcurrentMetadataStore

All Superinterfaces:

MetadataStore

All Known Subinterfaces:

ListenableMetadataStore

All Known Implementing Classes:

HazelcastMetadataStore, JdbcMetadataStore, MongoDbMetadataStore, PropertiesPersistingMetadataStore, RedisMetadataStore, SimpleMetadataStore, ZookeeperMetadataStore

public interface ConcurrentMetadataStore
extends MetadataStore

Supports atomic updates to values in the store.

Since:

4.0

Author:

Gary Russell, Glenn Renfro

Method Summary

Modifier and Type	Method	Description
@Nullable String	putIfAbsent(String key, String value)	Atomically insert the key into the store.
boolean	replace(String key, String oldValue, String newValue)	Atomically replace the value for the key in the store if the old value matches the oldValue argument.

Methods inherited from interface MetadataStore

get, put, remove

Method Details

putIfAbsent

@Nullable String putIfAbsent(String key,
 String value)

Atomically insert the key into the store.

Parameters:

key - The key.

value - The value.

Returns:

null if successful, the old value otherwise.

replace

boolean replace(String key,
 String oldValue,
 String newValue)

Atomically replace the value for the key in the store if the old value matches the oldValue argument.

Parameters:

key - The key.

oldValue - The old value.

newValue - The new value.

Returns:

true if successful.