Package com.atlassian.confluence.impl.cache

Interface ReadThroughCache<K,V>

Type Parameters:

K - the type of the cache key

V - the type of the cache value

All Known Implementing Classes:

ReadThroughAtlassianCache, ReadThroughEntityCache

public interface ReadThroughCache<K,V>

A simple cache interface that supports the use of read-through operations.

Since:

7.5

Method Summary

Modifier and Type	Method	Description
default V	get(K cacheKey, Supplier<V> delegateLoader)	Retrieve the value for the given key.
V	get(K cacheKey, Supplier<V> delegateLoader, Predicate<V> valueTester)	Retrieve the value for the given key.
Map<K,V>	getBulk(Set<K> cacheKeys, Function<Set<K>,Map<K,V>> delegateLoader)	Retrieves multiple values for the given keys.
void	remove(K cacheKey)	Removs the cache entry for the given key.
void	removeAll()	Removes all cache entries.

Method Details

get

default V get(K cacheKey,
 Supplier<V> delegateLoader)

Retrieve the value for the given key. If the value is in the cache this will be returned, else the given delegate will be called to retrieve the value. If the delegate returns a value, it will be placed in the cache and returned, else nothing will be placed in the cache and Optional.empty() will be returned.

Parameters:

cacheKey - the key to resolve in the cache

delegateLoader - A Supplier which will be called if there is no value in the cache (may return null).

Returns:

the cached value, or the value which was loaded from the supplier (may be null)

get

V get(K cacheKey,
 Supplier<V> delegateLoader,
 Predicate<V> valueTester)

Retrieve the value for the given key. If the value is in the cache this will be returned, else the given delegate will be called to retrieve the value. If the delegate returns a value, and if it passes the given filter, it will be placed in the cache and returned. If the filter rejects the value, nothing will be placed in the cache but the value will be returned from the method.

Parameters:

cacheKey - the key to resolve in the cache

delegateLoader - A Supplier which will be called if there is no value in the cache (may return null).

valueTester - A Predicate that will be used to test the validity of any value in the cache or loaded from the supplier

Returns:

the cached value, or the value which was loaded from the supplier (may be null)

getBulk

Map<K,V> getBulk(Set<K> cacheKeys,
 Function<Set<K>,Map<K,V>> delegateLoader)

Retrieves multiple values for the given keys. Any entries not already present in the cache will be supplied via the delegate loader.

remove

void remove(K cacheKey)

Removs the cache entry for the given key.

removeAll

void removeAll()

Removes all cache entries.