用OSCache进行缓存对象

    1. package com.klstudio.cache;  

2.

3. import java.util.Date;

4.

5. import com.opensymphony.oscache.base.NeedsRefreshException;

6. import com.opensymphony.oscache.general.GeneralCacheAdministrator;

7.

8. public class BaseCache extends GeneralCacheAdministrator {

9. //过期时间(单位为秒);

10. private int refreshPeriod;

11. //关键字前缀字符;

12. private String keyPrefix;

13.

14. private static final long serialVersionUID = -4397192926052141162L;

15.

16. public BaseCache(String keyPrefix,int refreshPeriod){

17. super();

18. this.keyPrefix = keyPrefix;

19. this.refreshPeriod = refreshPeriod;

20. }

21. //添加被缓存的对象;

22. public void put(String key,Object value){

23. this.putInCache(this.keyPrefix+"_"+key,value);

24. }

25. //删除被缓存的对象;

26. public void remove(String key){

27. this.flushEntry(this.keyPrefix+"_"+key);

28. }

29. //删除所有被缓存的对象;

30. public void removeAll(Date date){

31. this.flushAll(date);

32. }

33.

34. public void removeAll(){

35. this.flushAll();

36. }

37. //获取被缓存的对象;

38. public Object get(String key) throws Exception{

39. try{

40. return this.getFromCache(this.keyPrefix+"_"+key,this.refreshPeriod);

41. } catch (NeedsRefreshException e) {

42. this.cancelUpdate(this.keyPrefix+"_"+key);

43. throw e;

44. }

45.

46. }

47.

48. }



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1. package com.klstudio;

2.

3. import com.klstudio.News;

4. import com.klstudio.cache.BaseCache;

5.

6. public class CacheManager {

7.

8. private BaseCache newsCache;

9.

10.

11. private static CacheManager instance;

12. private static Object lock = new Object();

13.

14. public CacheManager() {

15. //这个根据配置文件来,初始BaseCache而已;

16. newsCache = new BaseCache("news",1800);

17. }

18.

19. public static CacheManager getInstance(){

20. if (instance == null){

21. synchronized( lock ){

22. if (instance == null){

23. instance = new CacheManager();

24. }

25. }

26. }

27. return instance;

28. }

29.

30. public void putNews(News news) {

31. // TODO 自动生成方法存根

32. newsCache.put(news.getID(),news);

33. }

34.

35. public void removeNews(String newsID) {

36. // TODO 自动生成方法存根

37. newsCache.remove(newsID);

38. }

39.

40. public News getNews(String newsID) {

41. // TODO 自动生成方法存根

42. try {

43. return (News) newsCache.get(newsID);

44. } catch (Exception e) {

45. // TODO 自动生成 catch 块

46. System.out.println("getNews>>newsID["+newsID+"]>>"+e.getMessage());

47. News news = new News(newsID);

48. this.putNews(news);

49. return news;

50. }

51. }

52.

53. public void removeAllNews() {

54. // TODO 自动生成方法存根

55. newsCache.removeAll();

56. }

57.

58. }
posted @ 2008-08-02 00:43  maventalker  阅读(99)  评论(0编辑  收藏  举报