Package org.apache.flink.runtime.util

Interface GroupCache<G,K,V>

Type Parameters:

G - The group.

K - The key.

V - The value.

All Known Implementing Classes:

DefaultGroupCache

public interface GroupCache<G,K,V>

This GroupCache can cache group, key and value. The group and key are cache key, each key belongs to a certain group. All corresponding keys and values will be cleared if a group is cleared.

Method Summary

Modifier and Type	Method	Description
void	clear()	clear all cache.
void	clearCacheForGroup(G group)	Clear all caches of the corresponding group.
V	get(G group, K key)	Get value in cache.
void	put(G group, K key, V value)	Put group, key and value to cache.

Method Detail

clear

void clear()

clear all cache.

get

@Nullable
V get(G group,
      K key)

Get value in cache.

Returns:

value in cache if exists, otherwise null

put

void put(G group,
         K key,
         V value)

Put group, key and value to cache.

clearCacheForGroup

void clearCacheForGroup(G group)

Clear all caches of the corresponding group.