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. }
