org.apache.openjpa.lib.util.concurrent
Class SizedConcurrentHashMap

java.lang.Object
  java.util.AbstractMap<K,V>
      java.util.concurrent.ConcurrentHashMap
          org.apache.openjpa.lib.util.concurrent.NullSafeConcurrentHashMap
              org.apache.openjpa.lib.util.concurrent.SizedConcurrentHashMap

All Implemented Interfaces:

Serializable, ConcurrentMap, Map, SizedMap

public class SizedConcurrentHashMap
extends NullSafeConcurrentHashMap
implements SizedMap, ConcurrentMap, Serializable

An implementation of SizedMap that uses JDK1.5 concurrency primitives

Since:

1.1.0

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.openjpa.lib.util.concurrent.NullSafeConcurrentHashMap

NullSafeConcurrentHashMap.KeyFilter

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

SizedConcurrentHashMap(int size, float load, int concurrencyLevel)

Method Summary

int	getMaxSize() The maximum number of entries, or Integer.MAX_VALUE for no limit.
boolean	isFull() Whether the map is full.
void	overflowRemoved(Object key, Object value) This implementation does nothing.
Object	put(Object key, Object value)
Object	putIfAbsent(Object key, Object value)
protected void	removeOverflow() Equivalent to removeOverflow(false).
protected void	removeOverflow(boolean forPut) Removes overflow.
void	setMaxSize(int max) The maximum number of entries, or Integer.MAX_VALUE for no limit.

Methods inherited from class org.apache.openjpa.lib.util.concurrent.NullSafeConcurrentHashMap

contains, containsKey, containsValue, elements, entrySet, get, keys, keySet, randomEntryIterator, remove, remove, removeRandom, replace, replace, 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 org.apache.openjpa.lib.util.concurrent.ConcurrentMap

randomEntryIterator, removeRandom

Methods inherited from interface java.util.Map

clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, putAll, remove, size, values

Constructor Detail

SizedConcurrentHashMap

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

Parameters:

size - the maximum size of this map. If additional elements are put into the map, overflow will be removed via calls to overflowRemoved(java.lang.Object, java.lang.Object).

load - the load factor for the underlying map

concurrencyLevel - the concurrency level for the underlying map

See Also:

ConcurrentHashMap

Method Detail

putIfAbsent

public Object putIfAbsent(Object key,
                          Object value)

Specified by:

putIfAbsent in interface ConcurrentMap

Overrides:

putIfAbsent in class NullSafeConcurrentHashMap

put

public Object put(Object key,
                  Object value)

Specified by:

put in interface Map

Overrides:

put in class NullSafeConcurrentHashMap

getMaxSize

public int getMaxSize()

Description copied from interface: SizedMap

The maximum number of entries, or Integer.MAX_VALUE for no limit.

Specified by:

getMaxSize in interface SizedMap

setMaxSize

public void setMaxSize(int max)

Description copied from interface: SizedMap

The maximum number of entries, or Integer.MAX_VALUE for no limit.

Specified by:

setMaxSize in interface SizedMap

removeOverflow

protected void removeOverflow()

Equivalent to removeOverflow(false).

removeOverflow

protected void removeOverflow(boolean forPut)

Removes overflow. If forPut is true, then this uses size() + 1 when computing size.

isFull

public boolean isFull()

Description copied from interface: SizedMap

Whether the map is full.

Specified by:

isFull in interface SizedMap

overflowRemoved

public void overflowRemoved(Object key,
                            Object value)

This implementation does nothing.

Specified by:

overflowRemoved in interface SizedMap