Package me.ahoo.cosid.sharding

Class ExactCollection<E>

java.lang.Object

java.util.AbstractCollection<E>

me.ahoo.cosid.sharding.ExactCollection<E>

All Implemented Interfaces:

Iterable<E>, Collection<E>, RandomAccess

public class ExactCollection<E>
extends AbstractCollection<E>
implements RandomAccess

准确式集合. 用于 Interval 算法、Mod 算法可以提前预知节点数量的场景。

 主要针对以下问题：
 -- 使用HashSet导致的内存空间浪费
 -- 添加元素时导致的集合膨胀(也可以通过给定 expectedSize 计算准确 capacity 就像 Sets.newHashSetWithExpectedSize(int))
 

Constructor Summary

Constructors

Constructor	Description
ExactCollection(int size)
ExactCollection(Object... elements)

Method Summary

Modifier and Type	Method	Description
void	add(int index, E element)
boolean	addAll(Collection<? extends E> c)
void	clear()
boolean	contains(Object o)
static <E> ExactCollection<E>	empty()
boolean	equals(Object obj)
E	get(int index)
int	hashCode()
int	indexOf(Object element)
Iterator<E>	iterator()
boolean	remove(Object o)
boolean	removeAll(Collection<?> c)
boolean	retainAll(Collection<?> c)
int	size()
Object[]	toArray()
<T> T[]	toArray(T[] a)

Methods inherited from class java.util.AbstractCollection

add, containsAll, isEmpty, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, spliterator, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Constructor Details

ExactCollection

public ExactCollection(int size)

ExactCollection

public ExactCollection(Object... elements)

Method Details

empty

public static <E> ExactCollection<E> empty()

size

public int size()

Specified by:

size in interface Collection<E>

Specified by:

size in class AbstractCollection<E>

get

public E get(int index)

add

public void add(int index,
 E element)

indexOf

public int indexOf(Object element)

contains

public boolean contains(Object o)

Specified by:

contains in interface Collection<E>

Overrides:

contains in class AbstractCollection<E>

iterator

public Iterator<E> iterator()

Specified by:

iterator in interface Collection<E>

Specified by:

iterator in interface Iterable<E>

Specified by:

iterator in class AbstractCollection<E>

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<E>

Overrides:

toArray in class AbstractCollection<E>

toArray

public <T> T[] toArray(T[] a)

Specified by:

toArray in interface Collection<E>

Overrides:

toArray in class AbstractCollection<E>

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<E>

Overrides:

remove in class AbstractCollection<E>

addAll

public boolean addAll(Collection<? extends E> c)

Specified by:

addAll in interface Collection<E>

Overrides:

addAll in class AbstractCollection<E>

removeAll

public boolean removeAll(Collection<?> c)

Specified by:

removeAll in interface Collection<E>

Overrides:

removeAll in class AbstractCollection<E>

retainAll

public boolean retainAll(Collection<?> c)

Specified by:

retainAll in interface Collection<E>

Overrides:

retainAll in class AbstractCollection<E>

hashCode

public int hashCode()

Specified by:

hashCode in interface Collection<E>

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Specified by:

equals in interface Collection<E>

Overrides:

equals in class Object

clear

public void clear()

Specified by:

clear in interface Collection<E>

Overrides:

clear in class AbstractCollection<E>