On Friday, February 18, 2011 4:50:39 PM UTC+1, Luca wrote:
>
> My data access layer is on another tier, I can't use a ThreadLocal because
> it can be executed on another thread or may be another node in the cluster.
But the RequestFactory request is executed all in one thread! What matters
is that the "session cache" is scoped to the ServletRequest.
class MyLocator extends Locator<A, String> {
@Override
public A find(Class<? extends A> clazz, String id) {
Map<String, A> cache = getCache();
A ret = cache.get(id);
if (ret == null) {
ret = // get from whatever
cache.put(id, ret);
}
return ret;
}
@SuppressWarnings("unchecked")
private Map<String, A> getCache() {
Map<String, A> cache = (Map<String, A>)
RequestFactoryServlet.getThreadLocalRequest().getAttribute("cache");
if (cache == null) {
cache =new HashMap<String, A>();
RequestFactoryServlet.getThreadLocalRequest().setAttribute("cache",
cache);
}
return cache;
}
...
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