Package hudson.util

Class CopyOnWriteMap<K,V>

java.lang.Object

hudson.util.CopyOnWriteMap<K,V>

All Implemented Interfaces:

Map<K,V>

Direct Known Subclasses:

CopyOnWriteMap.Hash, CopyOnWriteMap.Tree

public abstract class CopyOnWriteMap<K,V>
extends Object
implements Map<K,V>

Map that has copy-on-write semantics.

This class is suitable where highly concurrent access is needed, yet the write operation is relatively uncommon.

Author:

Kohsuke Kawaguchi

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	CopyOnWriteMap.Hash<K,V>	CopyOnWriteMap backed by HashMap.
static final class	CopyOnWriteMap.Tree<K,V>	CopyOnWriteMap backed by TreeMap.

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

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

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<K,V>	core

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CopyOnWriteMap()
protected	CopyOnWriteMap(Map<K,V> core)

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
protected abstract Map<K,V>	copy()
Set<Map.Entry<K,V>>	entrySet()	This method will return a read-only Set.
boolean	equals(Object obj)
V	get(Object key)
int	hashCode()
boolean	isEmpty()
Set<K>	keySet()	This method will return a read-only Set.
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> t)
V	remove(Object key)
void	replaceBy(Map<? extends K,? extends V> data)	Atomically replaces the entire map by the copy of the specified map.
int	size()
String	toString()
protected void	update(Map<K,V> m)
Collection<V>	values()	This method will return a read-only Collection.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Details

core

protected volatile Map<K,V> core

Constructor Details

CopyOnWriteMap

protected CopyOnWriteMap(Map<K,V> core)

CopyOnWriteMap

protected CopyOnWriteMap()

Method Details

update

protected void update(Map<K,V> m)

replaceBy

public void replaceBy(Map<? extends K,? extends V> data)

Atomically replaces the entire map by the copy of the specified map.

size

public int size()

Specified by:

size in interface Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

put

public V put(K key,
 V value)

Specified by:

put in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> t)

Specified by:

putAll in interface Map<K,V>

copy

protected abstract Map<K,V> copy()

clear

public void clear()

Specified by:

clear in interface Map<K,V>

keySet

public Set<K> keySet()

This method will return a read-only Set.

Specified by:

keySet in interface Map<K,V>

values

public Collection<V> values()

This method will return a read-only Collection.

Specified by:

values in interface Map<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

This method will return a read-only Set.

Specified by:

entrySet in interface Map<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object