com.litongjava.map

Class SyncWriteMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,V>

com.litongjava.map.SyncWriteMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,V>

public class SyncWriteMap<K,V>
extends HashMap<K,V>

SyncWriteMap 同步写 HashMap 创建原因是 HashMap扩容时，遇到并发修改可能造成 100% CPU 占用 SyncWriteMap 拥有 HashMap 的性能，但不保障并发访问的线程安全 只用于读多写少且不用保障线程安全的场景 例如 MethodKit 中用于缓存 MethodInfo 的 cache，被写入的数据 不用保障是单例，读取之后会做 null 值判断 ActionMapping 中的 HashMap 是系统启动时在独立线程内初始化的， 不存在并发写，只存在并发读的情况，所以仍然可以使用 HashMap

See Also:

Serialized Form

Nested Class Summary

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

Constructors

Constructor and Description
SyncWriteMap()
SyncWriteMap(int initialCapacity)
SyncWriteMap(int initialCapacity, float loadFactor)
SyncWriteMap(Map<? extends K,? extends V> m)

Method Summary

Modifier and Type	Method and Description
void	clear()
V	compute(K key, java.util.function.BiFunction<? super K,? super V,? extends V> remappingFunction)
V	computeIfAbsent(K key, java.util.function.Function<? super K,? extends V> mappingFunction)
V	computeIfPresent(K key, java.util.function.BiFunction<? super K,? super V,? extends V> remappingFunction)
V	merge(K key, V value, java.util.function.BiFunction<? super V,? super V,? extends V> remappingFunction)
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	putIfAbsent(K key, V value)
V	remove(Object key)
V	replace(K key, V value)
boolean	replace(K key, V oldValue, V newValue)
void	replaceAll(java.util.function.BiFunction<? super K,? super V,? extends V> function)

Methods inherited from class java.util.HashMap

clone, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, remove, size, values

Methods inherited from class java.util.AbstractMap

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

SyncWriteMap

public SyncWriteMap()

SyncWriteMap

public SyncWriteMap(int initialCapacity)

SyncWriteMap

public SyncWriteMap(int initialCapacity,
                    float loadFactor)

SyncWriteMap

public SyncWriteMap(Map<? extends K,? extends V> m)

Method Detail

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

Overrides:

put in class HashMap<K,V>

putIfAbsent

public V putIfAbsent(K key,
                     V value)

Specified by:

putIfAbsent in interface Map<K,V>

Overrides:

putIfAbsent in class HashMap<K,V>

putAll

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

Specified by:

putAll in interface Map<K,V>

Overrides:

putAll in class HashMap<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class HashMap<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class HashMap<K,V>

computeIfAbsent

public V computeIfAbsent(K key,
                         java.util.function.Function<? super K,? extends V> mappingFunction)

Specified by:

computeIfAbsent in interface Map<K,V>

Overrides:

computeIfAbsent in class HashMap<K,V>

computeIfPresent

public V computeIfPresent(K key,
                          java.util.function.BiFunction<? super K,? super V,? extends V> remappingFunction)

Specified by:

computeIfPresent in interface Map<K,V>

Overrides:

computeIfPresent in class HashMap<K,V>

compute

public V compute(K key,
                 java.util.function.BiFunction<? super K,? super V,? extends V> remappingFunction)

Specified by:

compute in interface Map<K,V>

Overrides:

compute in class HashMap<K,V>

replace

public boolean replace(K key,
                       V oldValue,
                       V newValue)

Specified by:

replace in interface Map<K,V>

Overrides:

replace in class HashMap<K,V>

replace

public V replace(K key,
                 V value)

Specified by:

replace in interface Map<K,V>

Overrides:

replace in class HashMap<K,V>

replaceAll

public void replaceAll(java.util.function.BiFunction<? super K,? super V,? extends V> function)

Specified by:

replaceAll in interface Map<K,V>

Overrides:

replaceAll in class HashMap<K,V>

merge

public V merge(K key,
               V value,
               java.util.function.BiFunction<? super V,? super V,? extends V> remappingFunction)

Specified by:

merge in interface Map<K,V>

Overrides:

merge in class HashMap<K,V>