Class ConcurrentItem

java.lang.Object
  |
  +--ConcurrentItem

public final class ConcurrentItem

extends java.lang.Object

Container class for elements in a concurrent list. Any object even null is allowed to be the content of a ConcurrentItem. Besides the necessary constructors, the only publically available methods can get or set the content of the container.

Version:

0.1, 05/19/03

Author:

Arno Formella and José B. González López

Field Summary

(package private) boolean	deleted The flag which indicates whether this item as been removed already by some thread.
(package private) java.lang.Object	element The content of this item.
(package private) int	iteratorCounter The counter which counts the number of iterators currently holding this item.
(package private) ConcurrentItem	next The link to the subsequent item in the list.
(package private) ConcurrentItem	previous The link to the previous item in the list.

Constructor Summary

	ConcurrentItem() Constructs an empty ConcurrentItem.
	ConcurrentItem(java.lang.Object element) Constructs a ConcurrentItem containing an object.
(package private)	ConcurrentItem(java.lang.Object element, ConcurrentItem next, ConcurrentItem previous) Constructs a ConcurrentItem containing an object and two links to the next and previous items in a ConcurrentList.

Method Summary

java.lang.Object	getElement() Returns the content of the item.
java.lang.Object	setElement(java.lang.Object element) Changes the content of the item.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

element

java.lang.Object element

The content of this item.

next

ConcurrentItem next

The link to the subsequent item in the list.

previous

ConcurrentItem previous

The link to the previous item in the list.

deleted

transient boolean deleted

The flag which indicates whether this item as been removed already by some thread.

iteratorCounter

transient int iteratorCounter

The counter which counts the number of iterators currently holding this item.

Constructor Detail

ConcurrentItem

public ConcurrentItem()

Constructs an empty ConcurrentItem. Empty means that the content of the item is null.

ConcurrentItem

public ConcurrentItem(java.lang.Object element)

Constructs a ConcurrentItem containing an object. If null is passed, the item will contain null as content.

Parameters:

element - the element to put as content of the item.

ConcurrentItem

ConcurrentItem(java.lang.Object element,
               ConcurrentItem next,
               ConcurrentItem previous)

Constructs a ConcurrentItem containing an object and two links to the next and previous items in a ConcurrentList. If null is passed, the item will contain null as content.

Parameters:

element - the element to put as content of the item.

next - the item to follow this item in the ConcurrentList.

previous - the item to preceed this item in the ConcurrentList.

Method Detail

setElement

public java.lang.Object setElement(java.lang.Object element)

Changes the content of the item.

Parameters:

element - the element to put as content of the item.

Returns:

the old content of the item.

getElement

public java.lang.Object getElement()

Returns the content of the item.

Returns:

the content of the item.