com.github.pmerienne.trident.state

Interface SetMultiMapState<K,V>

Type Parameters:

K - the type of keys

V - the type of values

All Superinterfaces:

ExtendedState<V>, storm.trident.state.State

All Known Implementing Classes:

MemorySetMultiMapState, RedisSetMultiMapState

public interface SetMultiMapState<K,V>
extends ExtendedState<V>

A State which wrap access to a Multimap that cannot hold duplicate key-value pairs. Adding a key-value pair that's already in the multimap has no effect.

Author:

pmerienne

Method Summary

Methods

Modifier and Type	Method and Description
Set<V>	get(K key) Returns a Set view of all values associated with a key.
boolean	put(K key, V value) Stores a key-value pair in the multimap.
long	sizeOf(K key) Returns the numbers of values which are mapped to a given key

Methods inherited from interface storm.trident.state.State

beginCommit, commit

Method Detail

sizeOf

long sizeOf(K key)

Returns the numbers of values which are mapped to a given key

Parameters:

key -

Returns:

put

boolean put(K key,
          V value)

Stores a key-value pair in the multimap. Storing a key-value pair that's already in the multimap has no effect.

Parameters:

key - key to store

value - value to store

Returns:

true if this changed the state

get

Set<V> get(K key)

Returns a Set view of all values associated with a key. If there's no mappings, an empty Set is returned.

Parameters:

key -

Returns:

the set of values that the key maps to