com.amazonaws.util

Class BoundedCache<K,V>

java.lang.Object

com.amazonaws.util.BoundedCache<K,V>

@ThreadSafe
public final class BoundedCache<K,V>
extends Object

A thread-safe cache implementation that returns the value for a specified key, retrieving it by either getting the stored value from the cache or using a supplied function to calculate that value and add it to the cache.

When the cache is full, batch eviction of random values will be performed, with a default evictionBatchSize of 10.

The user can configure the maximum size of the cache, which is set to a default of 150.

Keys must not be null, otherwise an error will be thrown. Null values are not cached.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BoundedCache.Builder<K,V>

Method Summary

Modifier and Type	Method and Description
static <K,V> BoundedCache.Builder	builder()
V	get(K key) Get a value based on the key.

Methods inherited from class java.lang.Object

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

Method Detail

get

public V get(K key)

Get a value based on the key. The key must not be null, otherwise an error is thrown. If the value exists in the cache, it's returned. Otherwise, the value is calculated based on the supplied function BoundedCache.Builder.mappingFunction(Function).

builder

public static <K,V> BoundedCache.Builder builder()