CopyOnWriteHashMap (yolean 7.567.26 API)

java.lang.Object
- com.yahoo.yolean.concurrent.CopyOnWriteHashMap<K,V>

All Implemented Interfaces:

Map<K,V>
```
public class CopyOnWriteHashMap<K,V>
extends Object
implements Map<K,V>
```
This is a thread hash map for small collections that are stable once built. Until it is stable there will be a race among all threads missing something in the map. They will then clone the map add the missing stuff and then put it back as active again. Here are no locks, but the cost is that inserts will happen a lot more than necessary. The map reference is volatile, but on most multi-cpu machines that has no cost unless modified.

Author:

baldersheim

Nested Class Summary
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors
Constructor Description

CopyOnWriteHashMap()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear()`
`boolean`	`containsKey(Object key)`
`boolean`	`containsValue(Object value)`
`Set<Map.Entry<K,V>>`	`entrySet()`
`V`	`get(Object key)`
`boolean`	`isEmpty()`
`Set<K>`	`keySet()`
`V`	`put(K key, V value)`
`void`	`putAll(Map<? extends K,? extends V> m)`
`V`	`remove(Object key)`
`int`	`size()`
`Collection<V>`	`values()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

- Constructor Detail
  - CopyOnWriteHashMap
```
public CopyOnWriteHashMap()
```
- Method Detail
  - 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> m)
```
    Specified by:
    
    putAll in interface Map<K,V>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface Map<K,V>
  - keySet
```
public Set<K> keySet()
```
    Specified by:
    
    keySet in interface Map<K,V>
  - values
```
public Collection<V> values()
```
    Specified by:
    
    values in interface Map<K,V>
  - entrySet
```
public Set<Map.Entry<K,V>> entrySet()
```
    Specified by:
    
    entrySet in interface Map<K,V>