net.yacy.cora.storage

Class ConcurrentARH<K>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractSet<K>

net.yacy.cora.storage.ConcurrentARH<K>

All Implemented Interfaces:

java.lang.Iterable<K>, java.util.Collection<K>, java.util.Set<K>, ARH<K>

public class ConcurrentARH<K>
extends java.util.AbstractSet<K>
implements java.util.Set<K>, java.lang.Iterable<K>, ARH<K>

An ARH is set for handles in respect to the ARC construction: an Adaptive Replacement Handle Cache.

Field Summary

Fields

Modifier and Type	Field and Description
private static java.lang.Object	_EXIST
private ConcurrentARC<K,java.lang.Object>	cache

Constructor Summary

Constructors

Constructor and Description
ConcurrentARH(int cacheSize, int partitions)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	add(K e) add a value to the cache.
void	clear() clear the cache
boolean	contains(java.lang.Object o) check if a value in the cache exist
void	delete(java.lang.Object o) delete an entry from the cache
boolean	isEmpty()
java.util.Iterator<K>	iterator() iterator implements the Iterable interface
java.util.Set<K>	set() Return a Set view of the mappings contained in this map.
int	size() get the size of the ARH.

Methods inherited from class java.util.AbstractSet

equals, hashCode, removeAll

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, remove, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Set

addAll, containsAll, equals, hashCode, remove, removeAll, retainAll, toArray, toArray

Methods inherited from interface net.yacy.cora.storage.ARH

hashCode

Field Detail

_EXIST

private static final java.lang.Object _EXIST

cache

private final ConcurrentARC<K,java.lang.Object> cache

Constructor Detail

ConcurrentARH

public ConcurrentARH(int cacheSize,
             int partitions)

Method Detail

size

public int size()

Description copied from interface: ARH

get the size of the ARH. this returns the sum of main and ghost cache

Specified by:

size in interface java.util.Collection<K>

Specified by:

size in interface java.util.Set<K>

Specified by:

size in interface ARH<K>

Specified by:

size in class java.util.AbstractCollection<K>

Returns:

the complete number of entries in the ARH cache

contains

public boolean contains(java.lang.Object o)

Description copied from interface: ARH

check if a value in the cache exist

Specified by:

contains in interface java.util.Collection<K>

Specified by:

contains in interface java.util.Set<K>

Specified by:

contains in interface ARH<K>

Overrides:

contains in class java.util.AbstractCollection<K>

Returns:

true if the value exist

clear

public void clear()

Description copied from interface: ARH

clear the cache

Specified by:

clear in interface java.util.Collection<K>

Specified by:

clear in interface java.util.Set<K>

Specified by:

clear in interface ARH<K>

Overrides:

clear in class java.util.AbstractCollection<K>

set

public java.util.Set<K> set()

Description copied from interface: ARH

Return a Set view of the mappings contained in this map. This method is the basis for all methods that are implemented by a AbstractMap implementation

Specified by:

set in interface ARH<K>

Returns:

a set view of the mappings contained in this map

iterator

public java.util.Iterator<K> iterator()

Description copied from interface: ARH

iterator implements the Iterable interface

Specified by:

iterator in interface java.lang.Iterable<K>

Specified by:

iterator in interface java.util.Collection<K>

Specified by:

iterator in interface java.util.Set<K>

Specified by:

iterator in interface ARH<K>

Specified by:

iterator in class java.util.AbstractCollection<K>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Collection<K>

Specified by:

isEmpty in interface java.util.Set<K>

Overrides:

isEmpty in class java.util.AbstractCollection<K>

add

public boolean add(K e)

Description copied from interface: ARH

add a value to the cache. do not return a previous content value

Specified by:

add in interface java.util.Collection<K>

Specified by:

add in interface java.util.Set<K>

Specified by:

add in interface ARH<K>

Overrides:

add in class java.util.AbstractCollection<K>

Returns:

true if this set did not already contain the specified element

delete

public void delete(java.lang.Object o)

Description copied from interface: ARH

delete an entry from the cache

Specified by:

delete in interface ARH<K>