Top Description Fields Constructors Methods
org.eclipse.persistence.internal.jpa

public final Class IsolatedHashMap<K, V>

extends Object
implements Map<K, V>
Class Inheritance
All Implemented Interfaces
java.util.Map
Imports
java.util.Collection, .HashMap, .Map, .Set, java.util.concurrent.ConcurrentHashMap, org.eclipse.persistence.platform.server.ServerPlatform, .ServerPlatformUtils
Partition isolated HashMap. Provides HashMap with partition isolation for ServerPlatforms that support partitioning. Partition isolation is transparent and keeps Map API unchanged.

Field Summary

Modifier and TypeField and Description
private static final int
DEFAULT_INITIAL_CAPACITY

Default initial capacity used to create HashMaps for individual partitions.

private static final float
DEFAULT_LOAD_FACTOR

Default load factor used to create HashMaps for individual partitions.

private static final String
DEFAULT_PARTITION_ID

Default short enough partition ID when server does not support partitions.

private final int
initialCapacity

Initial capacity used to create HashMaps for individual partitions.

private final float
loadFactor

Initial load factor used to create HashMaps for individual partitions.

private final Map<String, Map<K, V>>
maps

Partition ID to Map mapping.

private static final ServerPlatform
serverPlatform

Detected server platform.

private static final boolean
supportPartitions

Does platform support partitions?

Constructor Summary

AccessConstructor and Description
private
IsolatedHashMap()

Constructs an empty IsolatedHashMap with the default initial capacity 16 and the default load factor 0.75 for every partition.

private
IsolatedHashMap(final int
Initial capacity used to create HashMaps for individual partitions.
initialCapacity, final float
Initial load factor used used to create HashMaps for individual partitions.
loadFactor)

Constructs an empty IsolatedHashMap with the initial capacity and the default load factor specified as arguments.

Method Summary

Modifier and TypeMethod and Description
public void
clear()

Implements java.util.Map.clear.

Removes all of the mappings from this map (optional operation).
public boolean
containsKey(Object
key whose presence in this map is to be tested
key)

Implements java.util.Map.containsKey.

Returns true if this map contains a mapping for the specified key.
public boolean
containsValue(Object
value whose presence in this map is to be tested
value)

Implements java.util.Map.containsValue.

Returns true if this map maps one or more keys to the specified value.
public Set<Map.Entry<K, V>>
entrySet()

Implements java.util.Map.entrySet.

Returns a Set view of the mappings contained in this map.
public V
get(Object
the key whose associated value is to be returned
key)

Implements java.util.Map.get.

Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
private Map<K, V>

Returns:

Map for current partition. Will never return null.
getMap()

Get Map for current partition.

public boolean
isEmpty()

Implements java.util.Map.isEmpty.

Returns true if this map contains no key-value mappings.
public Set<K>
keySet()

Implements java.util.Map.keySet.

Returns a Set view of the keys contained in this map.
public static final <K, V> Map<K, V>
newMap()

INTERNAL: Partition isolated Map factory.

public V
put(K
key with which the specified value is to be associated
key, V
value to be associated with the specified key
value)

Implements java.util.Map.put.

Associates the specified value with the specified key in this map (optional operation).
public void
putAll(Map<? extends K, ? extends V>
mappings to be stored in this map
m)

Implements java.util.Map.putAll.

Copies all of the mappings from the specified map to this map (optional operation).
public V
remove(Object
key whose mapping is to be removed from the map
key)

Implements java.util.Map.remove.

Removes the mapping for a key from this map if it is present (optional operation).
public int
size()

Implements java.util.Map.size.

Returns the number of key-value mappings in this map.
public Collection<V>
values()

Implements java.util.Map.values.

Returns a Collection view of the values contained in this map.
Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

DEFAULT_INITIAL_CAPACITYback to summary
private static final int DEFAULT_INITIAL_CAPACITY

Default initial capacity used to create HashMaps for individual partitions.

DEFAULT_LOAD_FACTORback to summary
private static final float DEFAULT_LOAD_FACTOR

Default load factor used to create HashMaps for individual partitions.

DEFAULT_PARTITION_IDback to summary
private static final String DEFAULT_PARTITION_ID

Default short enough partition ID when server does not support partitions.

initialCapacityback to summary
private final int initialCapacity

Initial capacity used to create HashMaps for individual partitions.

loadFactorback to summary
private final float loadFactor

Initial load factor used to create HashMaps for individual partitions.

mapsback to summary
private final Map<String, Map<K, V>> maps

Partition ID to Map mapping. Used when platform does support partitions.

serverPlatformback to summary
private static final ServerPlatform serverPlatform

Detected server platform.

supportPartitionsback to summary
private static final boolean supportPartitions

Does platform support partitions?

Constructor Detail

IsolatedHashMapback to summary
private IsolatedHashMap()

Constructs an empty IsolatedHashMap with the default initial capacity 16 and the default load factor 0.75 for every partition.

IsolatedHashMapback to summary
private IsolatedHashMap(final int initialCapacity, final float loadFactor)

Constructs an empty IsolatedHashMap with the initial capacity and the default load factor specified as arguments.

Parameters
initialCapacity:int

Initial capacity used to create HashMaps for individual partitions.

loadFactor:float

Initial load factor used used to create HashMaps for individual partitions.

Method Detail

clearback to summary
public void clear()

Implements java.util.Map.clear.

Doc from java.util.Map.clear.

Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.

Annotations
@Override
containsKeyback to summary
public boolean containsKey(Object key)

Implements java.util.Map.containsKey.

Doc from java.util.Map.containsKey.

Returns true if this map contains a mapping for the specified key. More formally, returns true if and only if this map contains a mapping for a key k such that Objects.equals(key, k). (There can be at most one such mapping.)

Parameters
key:Object

key whose presence in this map is to be tested

Returns:boolean

true if this map contains a mapping for the specified key

Annotations
@Override
containsValueback to summary
public boolean containsValue(Object value)

Implements java.util.Map.containsValue.

Doc from java.util.Map.containsValue.

Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that Objects.equals(value, v). This operation will probably require time linear in the map size for most implementations of the Map interface.

Parameters
value:Object

value whose presence in this map is to be tested

Returns:boolean

true if this map maps one or more keys to the specified value

Annotations
@Override
entrySetback to summary
public Set<Map.Entry<K, V>> entrySet()

Implements java.util.Map.entrySet.

Doc from java.util.Map.entrySet.

Returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Returns:Set<Map.Entry<K, V>>

a set view of the mappings contained in this map

Annotations
@Override
getback to summary
public V get(Object key)

Implements java.util.Map.get.

Doc from java.util.Map.get.

Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

More formally, if this map contains a mapping from a key k to a value v such that Objects.equals(key, k), then this method returns v; otherwise it returns null. (There can be at most one such mapping.)

If this map permits null values, then a return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

Parameters
key:Object

the key whose associated value is to be returned

Returns:V

the value to which the specified key is mapped, or null if this map contains no mapping for the key

Annotations
@Override
getMapback to summary
private Map<K, V> getMap()

Get Map for current partition.

Returns:Map<K, V>

Map for current partition. Will never return null.

isEmptyback to summary
public boolean isEmpty()

Implements java.util.Map.isEmpty.

Doc from java.util.Map.isEmpty.

Returns true if this map contains no key-value mappings.

Returns:boolean

true if this map contains no key-value mappings

Annotations
@Override
keySetback to summary
public Set<K> keySet()

Implements java.util.Map.keySet.

Doc from java.util.Map.keySet.

Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.

Returns:Set<K>

a set view of the keys contained in this map

Annotations
@Override
newMapback to summary
public static final <K, V> Map<K, V> newMap()

INTERNAL: Partition isolated Map factory. Provides Map separated for individual partitions. Factory method will return HashMap on platforms without partitions support. Slower IsolatedHashMap instance will be used only on platforms with partitions support.

putback to summary
public V put(K key, V value)

Implements java.util.Map.put.

Doc from java.util.Map.put.

Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only if m.containsKey(k) would return true.)

Parameters
key:K

key with which the specified value is to be associated

value:V

value to be associated with the specified key

Returns:V

the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)

Annotations
@Override
putAllback to summary
public void putAll(Map<? extends K, ? extends V> m)

Implements java.util.Map.putAll.

Doc from java.util.Map.putAll.

Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(k, v) on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress. If the specified map has a defined encounter order, processing of its mappings generally occurs in that order.

Parameters
m:Map<? extends K, ? extends V>

mappings to be stored in this map

Annotations
@Override
removeback to summary
public V remove(Object key)

Implements java.util.Map.remove.

Doc from java.util.Map.remove.

Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed. (The map can contain at most one such mapping.)

Returns the value to which this map previously associated the key, or null if the map contained no mapping for the key.

If this map permits null values, then a return value of null does not necessarily indicate that the map contained no mapping for the key; it's also possible that the map explicitly mapped the key to null.

The map will not contain a mapping for the specified key once the call returns.

Parameters
key:Object

key whose mapping is to be removed from the map

Returns:V

the previous value associated with key, or null if there was no mapping for key.

Annotations
@Override
sizeback to summary
public int size()

Implements java.util.Map.size.

Doc from java.util.Map.size.

Returns the number of key-value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Returns:int

the number of key-value mappings in this map

Annotations
@Override
valuesback to summary
public Collection<V> values()

Implements java.util.Map.values.

Doc from java.util.Map.values.

Returns a Collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Returns:Collection<V>

a collection view of the values contained in this map

Annotations
@Override