Package org.apache.uima.util

Class ConcurrentHashMapWithProducer<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.concurrent.ConcurrentHashMap<K,V>

org.apache.uima.util.ConcurrentHashMapWithProducer<K,V>

All Implemented Interfaces:

Serializable, ConcurrentMap<K,V>, Map<K,V>

public class ConcurrentHashMapWithProducer<K,V>
extends ConcurrentHashMap<K,V>

A concurrent map supporting a value-creating get. There's a small window where the value producing function could be called multiple times on different threads, but the first one will be used and the others thrown away.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.concurrent.ConcurrentHashMap

ConcurrentHashMap.KeySetView<K extends Object,V extends Object>

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
ConcurrentHashMapWithProducer()
ConcurrentHashMapWithProducer(int initialCapacity)
ConcurrentHashMapWithProducer(int initialCapacity, float loadFactor)
ConcurrentHashMapWithProducer(int initialCapacity, float loadFactor, int concurrencyLevel)
ConcurrentHashMapWithProducer(Map<? extends K,? extends V> m)

Method Summary

Modifier and Type	Method	Description
V	get(K key, Callable<V> valueProducer)

Methods inherited from class java.util.concurrent.ConcurrentHashMap

clear, compute, computeIfAbsent, computeIfPresent, contains, containsKey, containsValue, elements, entrySet, equals, forEach, forEach, forEach, forEachEntry, forEachEntry, forEachKey, forEachKey, forEachValue, forEachValue, get, getOrDefault, hashCode, isEmpty, keys, keySet, keySet, mappingCount, merge, newKeySet, newKeySet, put, putAll, putIfAbsent, reduce, reduceEntries, reduceEntries, reduceEntriesToDouble, reduceEntriesToInt, reduceEntriesToLong, reduceKeys, reduceKeys, reduceKeysToDouble, reduceKeysToInt, reduceKeysToLong, reduceToDouble, reduceToInt, reduceToLong, reduceValues, reduceValues, reduceValuesToDouble, reduceValuesToInt, reduceValuesToLong, remove, remove, replace, replace, replaceAll, search, searchEntries, searchKeys, searchValues, size, toString, values

Methods inherited from class java.util.AbstractMap

clone

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

ConcurrentHashMapWithProducer

public ConcurrentHashMapWithProducer()

ConcurrentHashMapWithProducer

public ConcurrentHashMapWithProducer(int initialCapacity,
 float loadFactor,
 int concurrencyLevel)

ConcurrentHashMapWithProducer

public ConcurrentHashMapWithProducer(int initialCapacity,
 float loadFactor)

ConcurrentHashMapWithProducer

public ConcurrentHashMapWithProducer(int initialCapacity)

ConcurrentHashMapWithProducer

public ConcurrentHashMapWithProducer(Map<? extends K,? extends V> m)

Method Details

get

public V get(K key,
 Callable<V> valueProducer)
      throws Exception

Throws:

Exception