org.postgresql.util

Class LruCache<Key,Value extends CanEstimateSize>

java.lang.Object

org.postgresql.util.LruCache<Key,Value>

public class LruCache<Key,Value extends CanEstimateSize>
extends Object

Caches values in simple least-recently-accessed order.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	LruCache.CreateAction<Key,Value> When the entry is not present in cache, this create action is used to create one.
static interface	LruCache.EvictAction<Value> Action that is invoked when the entry is removed from the cache.

Constructor Summary

Constructors

Constructor and Description
LruCache(int maxSizeEntries, long maxSizeBytes, LruCache.CreateAction<Key,Value> createAction, LruCache.EvictAction<Value> onEvict)

Method Summary

Methods

Modifier and Type	Method and Description
Value	borrow(Key key) Borrows an entry from the cache.
void	put(Key key, Value value) Returns given value to the cache

Methods inherited from class java.lang.Object

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

Constructor Detail

LruCache

public LruCache(int maxSizeEntries,
        long maxSizeBytes,
        LruCache.CreateAction<Key,Value> createAction,
        LruCache.EvictAction<Value> onEvict)

Method Detail

borrow

public Value borrow(Key key)
                                     throws SQLException

Borrows an entry from the cache.

Parameters:

key - cache key

Returns:

entry from cache or newly created entry if cache does not contain given key.

Throws:

SQLException - if entry creation fails

put

public void put(Key key,
       Value value)

Returns given value to the cache

Parameters:

key - key

value - value