username and session caching
Hi, for your information, I've done a very simple/basic caching using jbosscache about 5 months ago and left it since then. In what have been done, I'm accessing a jbosscache(Mbean) and put a user session id in it. The article that I'm following is here
http://javaboutique.internet.com/tutorials/docaching/index-3.html
What happen is the data is not shared and each user have their own unique session id, which is exactly what I want it to be. I use JbossAS 4.0.4RC2 or 4.0.2 that time and maybe JbossCache 1.3(can't remember well, including the setting).
However when i tried it now with JbossAS 4.0.5 and Jboss 1.4, It doesn't work anymore. Instead the data that being put into cache will be overrided by a data from a second user. So now a first user will get a second user's session id, not his own.
The code use to put and get the data from jboss cache is as follow
private Option option = new Option();
private Fqn fqn =new Fqn("/user/session");
private Map<String, String> map = new HashMap<String, String>();
private TreeCacheMBean cache;
private TreeCacheMBean getTreeCacheMBean() {
if (cache == null) {
try {
log.info("TreeCacheMBean is null");
cache = (TreeCacheMBean) MBeanProxyExt.create(
TreeCacheMBean.class,
"jboss.cache:service=TomcatClusteringCache", server);
} catch (MalformedObjectNameException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return cache;
}
public void insertSession(String sessionID, String userId) throws Exception {
option.setCacheModeLocal(true);
map.put("userId", userId);
cache = getTreeCacheMBean();
cache.put(fqn,"sessionId", sessionId, option);
log.info("End input into cache");
}
public String getSession() throws Exception {
String session = "";
cache = getTreeCacheMBean();
option.setCacheModeLocal(true);
session = (String) cache.get(fqn,"sessionId",option);
return session;
}
I try to search in forum and found this
http://jboss.org/index.html?module=bb&op=viewtopic&t=86054
which is very-very similar with what I want to do. The question that puzzling me is can jboss cache automatically know who is whom in concurrent access? I means if it is able make a differentiate each user access without the data being overrided by newest insertion. I want to confirm whether my first try is really working or just my mistake in doing testing. If it is able to differentiate a user, then can you point me to configuration that need to be done? I read about locking and concurrency access but not found what i need. Sorry, a newbie here.
Thanks so much,
Anwar
