Hi All,
I have an issue with caching a list of "almost static" EntityProxies on the
client side.
First I checked the possibility to mark the url as "cachable" but since
RequestFactory urls are generated by GWT, it seamed too complicated to do.
I then decided to cache the EntityProxies in cookies. Saving to JSON was
ok, relaoding was a little tricky since I didn't get the point of all
methods declared in EntityProxyCategory (see the code below).
Finally things almost work but when I do a request, I receive a *SEVERE:
Server Error 413* (which is thrown by the servlet before processing the
request)
here's my code
@Category(LocalEntityProxyCategory.class)
protected interface CateoriesForCookieHolderFactory extends AutoBeanFactory
{
AutoBean<CategoriesForCookieHolder> categoriesForCookieHolder();
AutoBean<CategoryProxy> category();
AutoBean<ContextDynamicFieldProxy> contextDynamicFieldProxy();
}
public static class LocalEntityProxyCategory {
/**
* EntityProxies are equal if they are from the same RequestContext and
* their stableIds are equal.
*/
public static boolean equals(AutoBean<? extends EntityProxy> bean, Object
o) {
if (!(o instanceof EntityProxy)) {
return false;
}
AutoBean<EntityProxy> other = AutoBeanUtils.getAutoBean((EntityProxy) o);
if (other == null) {
// Unexpected, could be an user-provided implementation?
return false;
}
// Object comparison intentional. True if both null or both the same
return stableId(bean).equals(stableId(other))
&& nonDiffingRequestContext(bean) == nonDiffingRequestContext(other);
}
/**
* Hashcode is always that of the stableId, since it's stable across time.
*/
public static int hashCode(AutoBean<? extends EntityProxy> bean) {
return stableId(bean).hashCode();
}
/**
* Effectively overrides {@link BaseProxyCategory#stableId(AutoBean)} to
* return a narrower bound.
*/
public static <T extends EntityProxy> EntityProxyId<T> stableId(
final AutoBean<? extends T> bean) {
return new SimpleProxyId<T>(bean);
}
private static AbstractRequestContext nonDiffingRequestContext(
AutoBean<?> bean) {
AbstractRequestContext context = requestContext(bean);
return context;
}
}
public class SimpleProxyId<T extends EntityProxy> implements
EntityProxyId<T> {
long id;
Class<T> clazz;
@SuppressWarnings("unchecked")
public SimpleProxyId(AutoBean<? extends T> bean) {
BasicProxy proxy = (BasicProxy) bean.as();
id = proxy.getId();
clazz = (Class<T>) proxy.getClass();
}
@Override
public Class<T> getProxyClass() {
return clazz;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((clazz == null) ? 0 : clazz.hashCode());
result = prime * result + (int) (id ^ (id >>> 32));
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
SimpleProxyId other = (SimpleProxyId) obj;
if (clazz == null) {
if (other.clazz != null)
return false;
} else if (!clazz.equals(other.clazz))
return false;
if (id != other.id)
return false;
return true;
}
}
I think it is too complicated to do such caching (for what it is, maybe, it
could be a good idea to include a mechanism either for url resource caching
or for EntityProxy json read and write)
Best Regards,
Zied Hamdi
http://1vu.fr
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