org.apache.flink.runtime.util

接口 GroupCache<G,K,V>

类型参数:

G - The group.

K - The key.

V - The value.

所有已知实现类:

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.

方法概要

限定符和类型	方法和说明
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.

方法详细资料

clear

void clear()

clear all cache.

get

@Nullable
V get(G group,
                K key)

Get value in cache.

返回:

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.