org.opendaylight.infrautils.caches

Interface BaseCache<K,V>

All Superinterfaces:

AutoCloseable

All Known Subinterfaces:

Cache<K,V>, CheckedCache<K,V,E>

All Known Implementing Classes:

DelegatingNullSafeCache, DelegatingNullSafeCheckedCache

public interface BaseCache<K,V>
extends AutoCloseable

Base class for Cache and CheckedCache.

Author:

Michael Vorburger.ch

Method Summary

Modifier and Type	Method and Description
void	evict(K key) Evict an entry from the cache.
CacheManager	getManager()
void	put(K key, V value) Puts a new entry into the Cache, replacing any existing one.

Methods inherited from interface java.lang.AutoCloseable

close

Method Detail

evict

void evict(K key)

Evict an entry from the cache. If the cache does not currently contain an entry under this key, then this is ignored. If it does, that entry is evicted, to be re-calculated on the next get.

Use CacheManager.evictAll() to evict all entries of the entire cache.

put

void put(@Nonnull
         K key,
         @Nonnull
         V value)

Puts a new entry into the Cache, replacing any existing one.

Normally, you often never need to call this method, as in regular usage scenarios a cache API client just invokes Cache.get(Object) (or CheckedCache.get(Object), which then internally (may) use the CacheFunction (or CheckedCacheFunction) - without you ever having had to explicitly put something into the Cache.

This method is ONLY (!) intended for "optimizations". It is useful if the code using a cache already has a key and value (e.g. following an external update notification event kind of thing) and wants to "save time" on an expected subsequent Cache.get(Object) (or CheckedCache.get(Object) invoking the CacheFunction (or CheckedCacheFunction) unnecessarily, using this "hint" to "propose" an entry to the cache.

Any code using this must expect key/value pairs that have been put into a cache to disappear at any time (e.g. when the cache is full and this key/value hasn't been used, or after a programmatic or end-user operator initiated eviction), and be able to obtain THE SAME value from the CacheFunction (or CheckedCacheFunction), for the given key.

Failure to implement calls to this put method consistent with the implementation of the cache's get function WILL lead to weird cache inconsistencies!

Some Cache implementations may IGNORE this "hint" method.

Parameters:

key - the key of the proposed new cache entry

value - the value of the proposed new cache entry

Throws:

NullPointerException - if the cache's users passed a null key or value

getManager

CacheManager getManager()