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,V>`

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

      `AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>`

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

      `Map.Entry<K,V>`

  - ### Constructor Summary

    Constructors
    Constructor and 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

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and 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 Detail

    - #### 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 Detail

    - #### get

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

      Throws:
        `Exception`

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