oracle.wsm.common.sdk

Class LRUCache.Builder<K,V>

java.lang.Object

oracle.wsm.common.sdk.LRUCache.Builder<K,V>

Enclosing class:

LRUCache<K,V>

public static final class LRUCache.Builder<K,V>
extends java.lang.Object

A builder that creates ConcurrentLinkedHashMap instances. It provides a flexible approach for constructing customized instances with a named parameter syntax. It can be used in the following manner:

 ConcurrentMap<Vertex, Set<Edge>> graph = new Builder<Vertex, Set<Edge>>()
     .maximumWeightedCapacity(5000)
     .weigher(Weighers.<Edge>set())
     .build();
 

Method Summary

Modifier and Type	Method and Description
LRUCache<K,V>	build() Creates a new ConcurrentLinkedHashMap instance.
LRUCache.Builder<K,V>	concurrencyLevel(int concurrencyLevel) Specifies the estimated number of concurrently updating threads.
LRUCache.Builder<K,V>	initialCapacity(int initialCapacity) Specifies the initial capacity of the hash table (default 16).
<K1 extends K,V1 extends V> LRUCache.Builder<K1,V1>	listener(EvictionListener<? super K1,? super V1> listener) Specifies an optional listener that is registered for notification when an entry is evicted.
LRUCache.Builder<K,V>	maximumSize(long capacity) Specifies the maximum weighted capacity to coerce the map to and may exceed it temporarily.
static LRUCache.Builder<java.lang.Object,java.lang.Object>	newBuilder()
LRUCache.Builder<K,V>	weigher(EntryWeigher<? super K,? super V> weigher) Specifies an algorithm to determine how many the units of capacity an entry consumes.
LRUCache.Builder<K,V>	weigher(Weigher<V> weigher) Specifies an algorithm to determine how many the units of capacity a value consumes.

Methods inherited from class java.lang.Object

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

Method Detail

newBuilder

public static LRUCache.Builder<java.lang.Object,java.lang.Object> newBuilder()

initialCapacity

public LRUCache.Builder<K,V> initialCapacity(int initialCapacity)

Specifies the initial capacity of the hash table (default 16). This is the number of key-value pairs that the hash table can hold before a resize operation is required.

Parameters:

initialCapacity - the initial capacity used to size the hash table to accommodate this many entries.

Throws:

java.lang.IllegalArgumentException - if the initialCapacity is negative

maximumSize

public LRUCache.Builder<K,V> maximumSize(long capacity)

Specifies the maximum weighted capacity to coerce the map to and may exceed it temporarily.

Parameters:

capacity - the weighted threshold to bound the map by

Throws:

java.lang.IllegalArgumentException - if the maximumWeightedCapacity is negative

concurrencyLevel

public LRUCache.Builder<K,V> concurrencyLevel(int concurrencyLevel)

Specifies the estimated number of concurrently updating threads. The implementation performs internal sizing to try to accommodate this many threads (default 16).

Parameters:

concurrencyLevel - the estimated number of concurrently updating threads

Throws:

java.lang.IllegalArgumentException - if the concurrencyLevel is less than or equal to zero

listener

public <K1 extends K,V1 extends V> LRUCache.Builder<K1,V1> listener(EvictionListener<? super K1,? super V1> listener)

Specifies an optional listener that is registered for notification when an entry is evicted.

Parameters:

listener - the object to forward evicted entries to

Throws:

java.lang.NullPointerException - if the listener is null

weigher

public LRUCache.Builder<K,V> weigher(Weigher<V> weigher)

Specifies an algorithm to determine how many the units of capacity a value consumes. The default algorithm bounds the map by the number of key-value pairs by giving each entry a weight of 1.

Parameters:

weigher - the algorithm to determine a value's weight

Throws:

java.lang.NullPointerException - if the weigher is null

weigher

public LRUCache.Builder<K,V> weigher(EntryWeigher<? super K,? super V> weigher)

Specifies an algorithm to determine how many the units of capacity an entry consumes. The default algorithm bounds the map by the number of key-value pairs by giving each entry a weight of 1.

Parameters:

weigher - the algorithm to determine a entry's weight

Throws:

java.lang.NullPointerException - if the weigher is null

build

public LRUCache<K,V> build()

Creates a new ConcurrentLinkedHashMap instance.

Throws:

java.lang.IllegalStateException - if the maximum weighted capacity was not set