com.ds.common.cache

类 CacheObject

java.lang.Object

com.ds.common.cache.CacheObject

所有已实现的接口:

Serializable

public final class CacheObject
extends Object
implements Serializable

Title: 常用代码打包

Description: Wrapper for all objects put into cache. It's primary purpose is to maintain references to the linked lists that maintain the creation time of the object and the ordering of the most used objects. This class is optimized for speed rather than strictly correct encapsulation.

Copyright: Copyright (c) 2006

Company: www.justdos.net

版本:

1.0

作者:

wenzhang li

另请参阅:

序列化表格

字段概要

字段

限定符和类型	字段和说明
LinkedListNode	ageListNode A reference to the node in the age order list.
LinkedListNode	lastAccessedListNode A reference to the node in the cache order list.
Object	object Underlying object wrapped by the CacheObject.
int	readCount A count of the number of times the object has been read from cache.
int	size The size of the Cacheable object.

构造器概要

构造器

构造器和说明
CacheObject(Object object, int size) Creates a new cache object wrapper.

方法概要

从类继承的方法 java.lang.Object

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

字段详细资料

object

public Object object

Underlying object wrapped by the CacheObject.

size

public int size

The size of the Cacheable object. The size of the Cacheable object is only computed once when it is added to the cache. This makes the assumption that once objects are added to cache, they are mostly read-only and that their size does not change significantly over time.

lastAccessedListNode

public LinkedListNode lastAccessedListNode

A reference to the node in the cache order list. We keep the reference here to avoid linear scans of the list. Every time the object is accessed, the node is removed from its current spot in the list and moved to the front.

ageListNode

public LinkedListNode ageListNode

A reference to the node in the age order list. We keep the reference here to avoid linear scans of the list. The reference is used if the object has to be deleted from the list.

readCount

public int readCount

A count of the number of times the object has been read from cache.

构造器详细资料

CacheObject

public CacheObject(Object object,
                   int size)

Creates a new cache object wrapper. The size of the Cacheable object must be passed in in order to prevent another possibly expensive lookup by querying the object itself for its size.

参数:

object - the underlying Object to wrap.

size - the size of the Cachable object in bytes.