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OSCache工具類

OSCache是OpenSymphony組織提供的一個J2EE架構中Web應用層的緩存技術實現方案，可以使用內存、硬盤空間、同時使用內存和硬盤作為緩存區靈活的緩存系統:OSCache支持多種緩存級別，使用相當靈活簡單，在jsp中刷新緩存只要兩行代碼：

<% @?taglib?uri = " oscache " ?prefix = " cache " %>

< cache:flush?group = " device_types " ?scope = " application " ? />

但是有時需要在java代碼中刷新緩存，以下這個OSCacheUtil類可以工作，但是只能在webwork環境內調用：

import?javax.servlet.jsp.PageContext;

import?org.apache.log4j.Logger;

import?com.opensymphony.oscache.base.Cache;

import?com.opensymphony.oscache.web.ServletCacheAdministrator;

import?com.opensymphony.webwork.ServletActionContext;

/**

?*?osCache緩存工具類.

?*?只能在webwork環境內調用

?*?<p>Copyright:?Copyright?(c)?2005</p>

?*?<p>Company:?</p>

?*?@author?楊杰榮

?*?@version?1.0

?*/

public?class?OSCacheUtil

{

??private?static?final?Logger?log?=?Logger.getLogger(?OSCacheUtil.class?);

??public?static?final?int?ALL_SCOPE?=?0;

??public?static?final?int?SESSION_SCOPE?=?PageContext.SESSION_SCOPE;

??public?static?final?int?APPLICATION_SCOPE?=?PageContext.APPLICATION_SCOPE;

??private?static?ServletCacheAdministrator?admin?=?null;

??private?OSCacheUtil()

??{

??}

??/**

???*?刷新osCache組

???*?@param?group?Cache組名

???*?@param?cacheScope?Cache范圍，只能是SESSION_SCOPE或APPLICATION_SCOPE

???*/

??public?static?void?flushGroup(?String?group,?int?cacheScope?)

??{

????initCacheAdmin();

????if?(?cacheScope?==?SESSION_SCOPE?||?cacheScope?==?APPLICATION_SCOPE?)

????{

??????Cache?cache?=?admin.getCache(?ServletActionContext.getRequest(),

????????????????????????????????????cacheScope?);

??????cache.flushGroup(?group?);

????}

????else

????{

??????log.warn(?"A?cache?group?was?specified?for?flushing,?but?the?scope?wasn't?supplied?or?was?invalid"?);

????}

??}

??/**

???*?刷新osCache中的某個key'

???*?@param?key?String

???*?@param?cacheScope?Cache范圍，只能是SESSION_SCOPE或APPLICATION_SCOPE

???*/

??public?static?void?flushKey(?String?key,?int?cacheScope?)

??{

????initCacheAdmin();

????if?(?cacheScope?==?SESSION_SCOPE?||?cacheScope?==?APPLICATION_SCOPE?)

????{

??????String?actualKey?=?admin.generateEntryKey(

??????????key,?ServletActionContext.getRequest(),?cacheScope,?null?);

??????Cache?cache?=?admin.getCache(?ServletActionContext.getRequest(),?cacheScope?);

??????cache.flushEntry(?actualKey?);

????}

????else

????{

??????log.warn(?"A?cache?key?was?specified?for?flushing,?but?the?scope?wasn't?supplied?or?was?invalid"?);

????}

??}

??/**

???*?刷新所有的osCache

???*?@param?cacheScope?Cache范圍，可以是SESSION_SCOPE，APPLICATION_SCOPE，ALL_SCOPE

???*/

??public?static?void?flushAll(?int?cacheScope?)

??{

????initCacheAdmin();

????if?(?cacheScope?==?SESSION_SCOPE?||?cacheScope?==?APPLICATION_SCOPE?)

????{

??????admin.setFlushTime(?cacheScope?);

????}

????else

????{

??????admin.flushAll();

????}

??}

??private?static?void?initCacheAdmin()

??{

????if?(?admin?==?null?)

????{

??????admin?=?ServletCacheAdministrator.getInstance(?ServletActionContext.

??????????getServletContext()?);

????}

??}

}

posted @ 2006-06-29 09:32 楊杰榮閱讀(1489) | 評論 (2) | 編輯收藏

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