I've been trying to find out what (if any) consequences there may be for
implementing static class variables inside ejb3 stateless session beans. I've
created some beans in this manner and they appear to function as I would expect
on a standalone JBoss server, but I'm concerned that this technique may break
clustering.
Essentially I'm trying to cache seldomly updated data (in the database) that is
requested very frequently on the web front end.
@Stateless
| public class CatalogBean implements Catalog
| {
| static boolean current = false;
| static String data = null;
|
| public void refresh()
| {
| current = false;
| }
|
| public String getData()
| {
| if(! current)
| {
| update();
| }
| return data;
| }
|
| private void update()
| {
| data = getDataFromTheDatabase();
| current = true;
| }
| }
Beans that are responsible for CRUD call the refresh method on this stateless
bean - in turn updating their shared cache. My (hazy) understanding is that the
ejb container is responsible to ensure that only one thread at a time can
access a bean? Does this mean that different instances can be accessed
concurrently - and therefore I could have syncronization issues? I suspect that
static variables may be a bad idea - especially in a clustered environment.
Perhaps there is a different or recomended approach that I have not considered?
Thank you in advance for all your comments and insights.
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