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用OSCache進行緩存對象

1、OSCache是什么?
???? OSCache標記庫由OpenSymphony設計，它是一種開創性的緩存方案，它提供了在現有JSP頁面之內實現內存緩存的功能。OSCache是個一個被廣泛采用的高性能的J2EE緩存框架，OSCache還能應用于任何Java應用程序的普通的緩存解決方案。
2、OSCache的特點
????(1) 緩存任何對象：你可以不受限制的緩存部分jsp頁面或HTTP請求，任何java對象都可以緩存。
????(2) 擁有全面的API：OSCache API允許你通過編程的方式來控制所有的OSCache特性。
????(3) 永久緩存：緩存能被配置寫入硬盤，因此允許在應用服務器的多次生命周期間緩存創建開銷昂貴的數據。
????(4) 支持集群：集群緩存數據能被單個的進行參數配置，不需要修改代碼。
????(5) 緩存過期：你可以有最大限度的控制緩存對象的過期，包括可插入式的刷新策略（如果默認性能不能滿足需要時）。
3、OSCache的安裝與配置
????網上已經有一個不錯的使用教程：http://blog.csdn.net/ezerg/archive/2004/10/14/135769.aspx
4、有關“用OSCache進行緩存對象”的研究
????這個是我今天要說的東西。網上對于OSCache緩存Web頁面很多說明和例子，但對于緩存對象方面說得不多，我就把自已寫得一些東西放出來，讓大家看一看是怎樣緩存對象的!
??? 我基于GeneralCacheAdministrator類來寫的BaseCache類
???

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package ?com.klstudio.cache; ??
??
import ?java.util.Date; ??
??
import ?com.opensymphony.oscache.base.NeedsRefreshException; ??
import ?com.opensymphony.oscache.general.GeneralCacheAdministrator; ??
??
public ? class ?BaseCache? extends ?GeneralCacheAdministrator?{ ??
???? //過期時間(單位為秒); ??
???? private ? int ?refreshPeriod; ??
???? //關鍵字前綴字符; ??
???? private ?String?keyPrefix; ??
???? ??
???? private ? static ? final ? long ?serialVersionUID?=?-4397192926052141162L; ??
???? ??
???? public ?BaseCache(String?keyPrefix, int ?refreshPeriod){ ??
???????? super (); ??
???????? this .keyPrefix?=?keyPrefix; ??
???????? this .refreshPeriod?=?refreshPeriod; ??
????} ??
???? //添加被緩存的對象; ??
???? public ? void ?put(String?key,Object?value){ ??
???????? this .putInCache( this .keyPrefix+ "_" +key,value); ??
????} ??
???? //刪除被緩存的對象; ??
???? public ? void ?remove(String?key){ ??
???????? this .flushEntry( this .keyPrefix+ "_" +key); ??
????} ??
???? //刪除所有被緩存的對象; ??
???? public ? void ?removeAll(Date?date){ ??
???????? this .flushAll(date); ??
????} ??
???? ??
???? public ? void ?removeAll(){ ??
???????? this .flushAll(); ??
????} ??
???? //獲取被緩存的對象; ??
???? public ?Object?get(String?key)? throws ?Exception{ ??
???????? try { ??
???????????? return ? this .getFromCache( this .keyPrefix+ "_" +key, this .refreshPeriod); ??
????????}? catch ?(NeedsRefreshException?e)?{ ??
???????????? this .cancelUpdate( this .keyPrefix+ "_" +key); ??
???????????? throw ?e; ??
????????} ??
??
????} ??
???? ??
} ??
??
??

Java代碼

package ?com.klstudio.cache;??
??
import ?java.util.Date;??
??
import ?com.opensymphony.oscache.base.NeedsRefreshException;??
import ?com.opensymphony.oscache.general.GeneralCacheAdministrator;??
??
public ? class ?BaseCache? extends ?GeneralCacheAdministrator?{??
????//過期時間(單位為秒);??
????private?int?refreshPeriod;??
????//關鍵字前綴字符;??
????private?String?keyPrefix;??
??????
????private?static?final?long?serialVersionUID?=?-4397192926052141162L;??
??????
????public?BaseCache(String?keyPrefix,int?refreshPeriod){??
????????super();??
????????this.keyPrefix?=?keyPrefix;??
????????this.refreshPeriod?=?refreshPeriod;??
????}??
????//添加被緩存的對象;??
????public?void?put(String?key,Object?value){??
????????this.putInCache(this.keyPrefix+"_"+key,value);??
????}??
????//刪除被緩存的對象;??
????public?void?remove(String?key){??
????????this.flushEntry(this.keyPrefix+"_"+key);??
????}??
????//刪除所有被緩存的對象;??
????public?void?removeAll(Date?date){??
????????this.flushAll(date);??
????}??
??????
????public?void?removeAll(){??
????????this.flushAll();??
????}??
????//獲取被緩存的對象;??
????public?Object?get(String?key)?throws?Exception{??
????????try{??
????????????return?this.getFromCache(this.keyPrefix+"_"+key,this.refreshPeriod);??
????????}?catch?(NeedsRefreshException?e)?{??
????????????this.cancelUpdate(this.keyPrefix+"_"+key);??
????????????throw?e;??
????????}??
??
????}??
??????
}??

package com.klstudio.cache;

import java.util.Date;

import com.opensymphony.oscache.base.NeedsRefreshException;
import com.opensymphony.oscache.general.GeneralCacheAdministrator;

public class BaseCache extends GeneralCacheAdministrator {
	//過期時間(單位為秒);
	private int refreshPeriod;
	//關鍵字前綴字符;
	private String keyPrefix;
	
	private static final long serialVersionUID = -4397192926052141162L;
	
	public BaseCache(String keyPrefix,int refreshPeriod){
		super();
		this.keyPrefix = keyPrefix;
		this.refreshPeriod = refreshPeriod;
	}
	//添加被緩存的對象;
	public void put(String key,Object value){
		this.putInCache(this.keyPrefix+"_"+key,value);
	}
	//刪除被緩存的對象;
	public void remove(String key){
		this.flushEntry(this.keyPrefix+"_"+key);
	}
	//刪除所有被緩存的對象;
	public void removeAll(Date date){
		this.flushAll(date);
	}
	
	public void removeAll(){
		this.flushAll();
	}
	//獲取被緩存的對象;
	public Object get(String key) throws Exception{
		try{
			return this.getFromCache(this.keyPrefix+"_"+key,this.refreshPeriod);
		} catch (NeedsRefreshException e) {
			this.cancelUpdate(this.keyPrefix+"_"+key);
			throw e;
		}

}
	
}

?? 通過CacheManager類來看怎樣緩存對象的,這個類中所用的News只是具體功能的類，我就不貼出來了，你可以自己寫一個!
???

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package?com.klstudio; ??
??
import?com.klstudio.News; ??
import?com.klstudio.cache.BaseCache; ??
??
public?class?CacheManager?{ ??
???? ??
????private?BaseCache?newsCache; ??
??
???? ??
????private?static?CacheManager?instance; ??
????private?static?Object?lock?=?new?Object(); ??
???? ??
????public?CacheManager()?{ ??
????????//這個根據配置文件來，初始BaseCache而已; ??
????????newsCache?=?new?BaseCache("news",1800);????? ??
????} ??
???? ??
????public?static?CacheManager?getInstance(){ ??
????????if?(instance?==?null){ ??
????????????synchronized(?lock?){ ??
????????????????if?(instance?==?null){ ??
????????????????????instance?=?new?CacheManager(); ??
????????????????} ??
????????????} ??
????????} ??
????????return?instance; ??
????} ??
??
????public?void?putNews(News?news)?{ ??
????????//?TODO?自動生成方法存根 ??
????????newsCache.put(news.getID(),news); ??
????} ??
??
????public?void?removeNews(String?newsID)?{ ??
????????//?TODO?自動生成方法存根 ??
????????newsCache.remove(newsID); ??
????} ??
??
????public?News?getNews(String?newsID)?{ ??
????????//?TODO?自動生成方法存根 ??
????????try?{ ??
????????????return?(News)?newsCache.get(newsID); ??
????????}?catch?(Exception?e)?{ ??
????????????//?TODO?自動生成?catch?塊 ??
????????????System.out.println("getNews>>newsID["+newsID+"]>>"+e.getMessage()); ??
????????????News?news?=?new?News(newsID); ??
????????????this.putNews(news); ??
????????????return?news; ??
????????} ??
????} ??
??
????public?void?removeAllNews()?{ ??
????????//?TODO?自動生成方法存根 ??
????????newsCache.removeAll(); ??
????} ??
??
} ??
??

Java代碼

package?com.klstudio;??
??
import?com.klstudio.News;??
import?com.klstudio.cache.BaseCache;??
??
public?class?CacheManager?{??
??????
????private?BaseCache?newsCache;??
??
??????
????private?static?CacheManager?instance;??
????private?static?Object?lock?=?new?Object();??
??????
????public?CacheManager()?{??
????????//這個根據配置文件來，初始BaseCache而已;??
????????newsCache?=?new?BaseCache("news",1800);???????
????}??
??????
????public?static?CacheManager?getInstance(){??
????????if?(instance?==?null){??
????????????synchronized(?lock?){??
????????????????if?(instance?==?null){??
????????????????????instance?=?new?CacheManager();??
????????????????}??
????????????}??
????????}??
????????return?instance;??
????}??
??
????public?void?putNews(News?news)?{??
????????//?TODO?自動生成方法存根??
????????newsCache.put(news.getID(),news);??
????}??
??
????public?void?removeNews(String?newsID)?{??
????????//?TODO?自動生成方法存根??
????????newsCache.remove(newsID);??
????}??
??
????public?News?getNews(String?newsID)?{??
????????//?TODO?自動生成方法存根??
????????try?{??
????????????return?(News)?newsCache.get(newsID);??
????????}?catch?(Exception?e)?{??
????????????//?TODO?自動生成?catch?塊??
????????????System.out.println("getNews>>newsID["+newsID+"]>>"+e.getMessage());??
????????????News?news?=?new?News(newsID);??
????????????this.putNews(news);??
????????????return?news;??
????????}??
????}??
??
????public?void?removeAllNews()?{??
????????//?TODO?自動生成方法存根??
????????newsCache.removeAll();??
????}??
??
}?

posted on 2010-08-09 15:57 禮物閱讀(387) 評論(0) 編輯收藏所屬分類: cache

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