Package com.clickhouse.client.cache

Class CaffeineCache<K,V>

java.lang.Object

com.clickhouse.client.cache.CaffeineCache<K,V>

All Implemented Interfaces:

ClickHouseCache<K,V>

public class CaffeineCache<K,V>
extends Object
implements ClickHouseCache<K,V>

Cache based on Caffeine implementation. Please be aware that it's not really a LRU cache.

Field Summary

Fields inherited from interface com.clickhouse.client.ClickHouseCache

DEFAULT_CACHE_SIZE

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CaffeineCache(int capacity, long expireSeconds, Function<K,V> loadFunc)

Method Summary

Modifier and Type	Method	Description
static <K,V> ClickHouseCache<K,V>	create(int capacity, long expireSeconds, Function<K,V> loadFunc)	Creates a cache with given capacity, seconds to expire(after access), and load function.
V	get(K key)	Gets value from cache if it exists.
<T> T	unwrap(Class<T> clazz)	Gets inner cache object to gain more access.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CaffeineCache

protected CaffeineCache(int capacity,
                        long expireSeconds,
                        Function<K,V> loadFunc)

Method Detail

create

public static <K,V> ClickHouseCache<K,V> create(int capacity,
                                                            long expireSeconds,
                                                            Function<K,V> loadFunc)

Creates a cache with given capacity, seconds to expire(after access), and load function.

Type Parameters:

K - type of the key

V - type of the value

Parameters:

capacity - capacity of the cache

expireSeconds - seconds to expire after access

loadFunc - load function

Returns:

cache

get

public V get(K key)

Description copied from interface: ClickHouseCache

Gets value from cache if it exists.

Specified by:

get in interface ClickHouseCache<K,V>

Parameters:

key - key, in genernal should NOT be null

Returns:

non-null value in general

unwrap

public <T> T unwrap(Class<T> clazz)

Description copied from interface: ClickHouseCache

Gets inner cache object to gain more access.

Specified by:

unwrap in interface ClickHouseCache<K,V>

Type Parameters:

T - type of the cache

Parameters:

clazz - non-null class of the cache

Returns:

inner cache object