alluxio.collections

Class ConcurrentHashSet<T>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<T>

alluxio.collections.ConcurrentHashSet<T>

Type Parameters:

T - the type of the set objects

All Implemented Interfaces:

Iterable<T>, Collection<T>, Set<T>

@ThreadSafe
public final class ConcurrentHashSet<T>
extends AbstractSet<T>

A concurrent hash set. This is backed by a ConcurrentHashMap, and Set operations are translated to ConcurrentHashMap operations.

Constructor Summary

Constructors

Constructor and Description
ConcurrentHashSet() Creates a new ConcurrentHashSet.
ConcurrentHashSet(int initialCapacity, float loadFactor, int concurrencyLevel) Creates a new ConcurrentHashSet.

Method Summary

Modifier and Type	Method and Description
boolean	add(T element)
boolean	addIfAbsent(T element) Adds an element into the set, if and only if it is not already a part of the set.
void	clear()
boolean	contains(Object o)
boolean	containsAll(Collection<?> c)
boolean	isEmpty()
Iterator<T>	iterator()
boolean	remove(Object o)
boolean	removeAll(Collection<?> c)
boolean	retainAll(Collection<?> c)
int	size()
Object[]	toArray()
<E> E[]	toArray(E[] a)
String	toString()

Methods inherited from class java.util.AbstractSet

equals, hashCode

Methods inherited from class java.util.AbstractCollection

addAll

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

addAll, spliterator

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

ConcurrentHashSet

public ConcurrentHashSet()

Creates a new ConcurrentHashSet.

ConcurrentHashSet

public ConcurrentHashSet(int initialCapacity,
                         float loadFactor,
                         int concurrencyLevel)

Creates a new ConcurrentHashSet.

Parameters:

initialCapacity - the initial capacity

loadFactor - the load factor threshold, used to control resizing

concurrencyLevel - the estimated number of concurrently updating threads

Method Detail

iterator

public Iterator<T> iterator()

Specified by:

iterator in interface Iterable<T>

Specified by:

iterator in interface Collection<T>

Specified by:

iterator in interface Set<T>

Specified by:

iterator in class AbstractCollection<T>

size

public int size()

Specified by:

size in interface Collection<T>

Specified by:

size in interface Set<T>

Specified by:

size in class AbstractCollection<T>

add

public boolean add(T element)

Specified by:

add in interface Collection<T>

Specified by:

add in interface Set<T>

Overrides:

add in class AbstractCollection<T>

addIfAbsent

public boolean addIfAbsent(T element)

Adds an element into the set, if and only if it is not already a part of the set.

Parameters:

element - the element to add into the set

Returns:

true if this set did not already contain the specified element

clear

public void clear()

Specified by:

clear in interface Collection<T>

Specified by:

clear in interface Set<T>

Overrides:

clear in class AbstractCollection<T>

contains

public boolean contains(Object o)

Specified by:

contains in interface Collection<T>

Specified by:

contains in interface Set<T>

Overrides:

contains in class AbstractCollection<T>

containsAll

public boolean containsAll(Collection<?> c)

Specified by:

containsAll in interface Collection<T>

Specified by:

containsAll in interface Set<T>

Overrides:

containsAll in class AbstractCollection<T>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Collection<T>

Specified by:

isEmpty in interface Set<T>

Overrides:

isEmpty in class AbstractCollection<T>

remove

public boolean remove(Object o)

Specified by:

remove in interface Collection<T>

Specified by:

remove in interface Set<T>

Overrides:

remove in class AbstractCollection<T>

removeAll

public boolean removeAll(Collection<?> c)

Specified by:

removeAll in interface Collection<T>

Specified by:

removeAll in interface Set<T>

Overrides:

removeAll in class AbstractSet<T>

retainAll

public boolean retainAll(Collection<?> c)

Specified by:

retainAll in interface Collection<T>

Specified by:

retainAll in interface Set<T>

Overrides:

retainAll in class AbstractCollection<T>

toArray

public Object[] toArray()

Specified by:

toArray in interface Collection<T>

Specified by:

toArray in interface Set<T>

Overrides:

toArray in class AbstractCollection<T>

toArray

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

Specified by:

toArray in interface Collection<T>

Specified by:

toArray in interface Set<T>

Overrides:

toArray in class AbstractCollection<T>

toString

public String toString()

Overrides:

toString in class AbstractCollection<T>