com.github.pmerienne.trident.state

Interface MapMultimapState<K1,K2,V>

Type Parameters:

K1 - the type of keys in the upper map

K2 - the type of keys in the nested maps

V - the type of values

All Superinterfaces:

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

All Known Implementing Classes:

MemoryMapMultimapState, RedisMapMultimapState

public interface MapMultimapState<K1,K2,V>
extends ExtendedState<V>

A State which wrap access to a Map of nested map.

Author:

pmerienne

Method Summary

Methods

Modifier and Type	Method and Description
V	get(K1 key, K2 subkey) Get the value stored at key, subkey.
Map<K2,V>	getAll(K1 key) Returns the nested map at key.
boolean	put(K1 key, K2 subkey, V value) Add a given value at key, subkey.

Methods inherited from interface storm.trident.state.State

beginCommit, commit

Method Detail

put

boolean put(K1 key,
          K2 subkey,
          V value)

Add a given value at key, subkey.

Parameters:

key -

subkey -

value -

Returns:

get

V get(K1 key,
    K2 subkey)

Get the value stored at key, subkey.

Parameters:

key -

subkey -

Returns:

the stored value or null if there's no mappings

getAll

Map<K2,V> getAll(K1 key)

Returns the nested map at key. If there's no mappings, an empty Map is returned.

Parameters:

key -

Returns: