org.apache.openjpa.lib.util.concurrent

Class NullSafeConcurrentHashMap

java.lang.Object

java.util.AbstractMap<K,V>

java.util.concurrent.ConcurrentHashMap

org.apache.openjpa.lib.util.concurrent.NullSafeConcurrentHashMap

All Implemented Interfaces:

java.io.Serializable, java.util.concurrent.ConcurrentMap, java.util.Map

Direct Known Subclasses:

SizedConcurrentHashMap

public class NullSafeConcurrentHashMap
extends java.util.concurrent.ConcurrentHashMap

A subclass of ConcurrentHashMap that allows null keys and values. In exchange, it weakens the contract of putIfAbsent(java.lang.Object, java.lang.Object) and the other concurrent methods added in #ConcurrentHashMap.

Since:

1.1.0

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	NullSafeConcurrentHashMap.KeyFilter

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

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

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

java.util.Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
NullSafeConcurrentHashMap()
NullSafeConcurrentHashMap(int size, float load, int concurrencyLevel)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	contains(java.lang.Object value)
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
java.util.Enumeration	elements()
java.util.Set	entrySet()
java.lang.Object	get(java.lang.Object key)
java.util.Enumeration	keys()
java.util.Set	keySet()
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
java.lang.Object	putIfAbsent(java.lang.Object key, java.lang.Object value)
java.util.Iterator<java.util.Map.Entry>	randomEntryIterator() The returned data structure should not be shared among multiple threads.
java.lang.Object	remove(java.lang.Object key)
boolean	remove(java.lang.Object key, java.lang.Object value)
java.util.Map.Entry	removeRandom()
java.lang.Object	replace(java.lang.Object key, java.lang.Object value)
boolean	replace(java.lang.Object key, java.lang.Object oldValue, java.lang.Object newValue)
java.util.Collection	values()

Methods inherited from class java.util.concurrent.ConcurrentHashMap

clear, isEmpty, putAll, size

Methods inherited from class java.util.AbstractMap

clone, equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

NullSafeConcurrentHashMap

public NullSafeConcurrentHashMap(int size,
                         float load,
                         int concurrencyLevel)

NullSafeConcurrentHashMap

public NullSafeConcurrentHashMap()

Method Detail

removeRandom

public java.util.Map.Entry removeRandom()

randomEntryIterator

public java.util.Iterator<java.util.Map.Entry> randomEntryIterator()

The returned data structure should not be shared among multiple threads.

remove

public java.lang.Object remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map

Overrides:

remove in class java.util.concurrent.ConcurrentHashMap

remove

public boolean remove(java.lang.Object key,
             java.lang.Object value)

Specified by:

remove in interface java.util.concurrent.ConcurrentMap

Overrides:

remove in class java.util.concurrent.ConcurrentHashMap

replace

public boolean replace(java.lang.Object key,
              java.lang.Object oldValue,
              java.lang.Object newValue)

Specified by:

replace in interface java.util.concurrent.ConcurrentMap

Overrides:

replace in class java.util.concurrent.ConcurrentHashMap

replace

public java.lang.Object replace(java.lang.Object key,
                       java.lang.Object value)

Specified by:

replace in interface java.util.concurrent.ConcurrentMap

Overrides:

replace in class java.util.concurrent.ConcurrentHashMap

putIfAbsent

public java.lang.Object putIfAbsent(java.lang.Object key,
                           java.lang.Object value)

Specified by:

putIfAbsent in interface java.util.concurrent.ConcurrentMap

Overrides:

putIfAbsent in class java.util.concurrent.ConcurrentHashMap

put

public java.lang.Object put(java.lang.Object key,
                   java.lang.Object value)

Specified by:

put in interface java.util.Map

Overrides:

put in class java.util.concurrent.ConcurrentHashMap

get

public java.lang.Object get(java.lang.Object key)

Specified by:

get in interface java.util.Map

Overrides:

get in class java.util.concurrent.ConcurrentHashMap

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map

Overrides:

containsKey in class java.util.concurrent.ConcurrentHashMap

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map

Overrides:

containsValue in class java.util.concurrent.ConcurrentHashMap

contains

public boolean contains(java.lang.Object value)

Overrides:

contains in class java.util.concurrent.ConcurrentHashMap

elements

public java.util.Enumeration elements()

Overrides:

elements in class java.util.concurrent.ConcurrentHashMap

entrySet

public java.util.Set entrySet()

Specified by:

entrySet in interface java.util.Map

Overrides:

entrySet in class java.util.concurrent.ConcurrentHashMap

keys

public java.util.Enumeration keys()

Overrides:

keys in class java.util.concurrent.ConcurrentHashMap

keySet

public java.util.Set keySet()

Specified by:

keySet in interface java.util.Map

Overrides:

keySet in class java.util.concurrent.ConcurrentHashMap

values

public java.util.Collection values()

Specified by:

values in interface java.util.Map

Overrides:

values in class java.util.concurrent.ConcurrentHashMap