a simple memcached client Demo

在当前的一个语音系统中，需要频繁进行I/O操作， 为了应付未来可能出现的高并发访问， 初步计划引入缓存机制。
在诸多缓存中， ehcache口碑不错， 我之前也写过一篇文章介绍ehcache的使用：
http://lcllcl987.iteye.com/blog/222693

但ehcache不是一个分布式缓存解决方案。
所以， 就初选memcached了:
http://www.danga.com/memcached/

memcached的安装交给google，略过不表。


下面是两个memcached client的java实现：
http://www.whalin.com/memcached/
http://code.google.com/p/spymemcached/

以
http://www.whalin.com/memcached/
为例， 它的文档不错， 就不多说了。 test如下：

2. packageco.cache;
4. importcom.danga.MemCached.MemCachedClient;
5. importcom.danga.MemCached.SockIOPool;
7. publicclassMyMemCachedClient
8. {
9. //createastaticclientasmostinstallsonlyneed
10. //asingleinstance
11. privatestaticMemCachedClientmemCachedClient=newMemCachedClient();
13. //setupconnectionpoolonceatclassload
14. static
15. {
16. //serverlistandweights
17. String[]servers={"192.168.0.55:11211"};
19. Integer[]weights={3};
21. //grabaninstanceofourconnectionpool
22. SockIOPoolpool=SockIOPool.getInstance();
24. //settheserversandtheweights
25. pool.setServers(servers);
26. pool.setWeights(weights);
27. //setsomebasicpoolsettings
28. //5initial,5min,and250maxconns
29. //andsetthemaxidletimeforaconn
30. //to6hours
31. pool.setInitConn(5);
32. pool.setMinConn(5);
33. pool.setMaxConn(250);
34. pool.setMaxIdle(1000*60*60*6);
36. //setthesleepforthemaintthread
37. //itwillwakeupeveryxsecondsand
38. //maintainthepoolsize
39. pool.setMaintSleep(30);
41. //setsomeTCPsettings
42. //disablenagle
43. //setthereadtimeoutto3secs
44. //anddon'tsetaconnecttimeout
45. pool.setNagle(false);
46. pool.setSocketTO(3000);
47. pool.setSocketConnectTO(0);
49. //initializetheconnectionpool
50. pool.initialize();
52. //letssetsomecompressiononfortheclient
53. //compressanythinglargerthan64k
54. memCachedClient.setCompressEnable(true);
55. memCachedClient.setCompressThreshold(64*1024);
56. }
58. publicstaticMemCachedClientgetMemCachedClient()
59. {
60. returnmemCachedClient;
61. }
63. //fromhereondown,youcancallanyoftheclientcalls
64. publicstaticvoidexamples()
65. {
66. memCachedClient.set("foo","ThisisatestString");
67. Stringbar=(String)memCachedClient.get("foo");
68. }
70. publicstaticvoidmain(String[]args)
71. {
72. MyMemCachedClient.getMemCachedClient().set("foo","ThisisatestString.");
73. Stringbar=(String)MyMemCachedClient.getMemCachedClient().get("foo");
74. System.out.println(bar);
75. }
76. }
77. 和ehcache不同的是，memcached似乎只采用LRU算法， 还对付cache满员的情况。