On 04/25/2011 10:44 AM, Edvin Syse wrote:
>> Hmm.
>>
>> When you call request.getSession(), have you already set the
>> Thread.setContextClassLoader?
>>
>> It might be cleaner for us to add a "use-context-class-loader" as a
>> <session-config> configuration.
>>
>> -- Scotthttp://maillist.caucho.com/mailman/listinfo/resin-interest
> Basically, I construct a classloader that extends URLClassLoader that
> points to the user's compiled classes. This classloader does
> myClassLoader.loadClass("name-of-the-controller-for-this-page").newInstance(),
> casts it to a "PageController" and runs it's execute() method
> (PageController interface).
The typical pattern for a custom classloader would also use:
Thread thread = Thread.currentThread();
ClassLoader oldLoader = thread.getContextClassLoader();
try {
thread.setContextClassLoader(myClassLoader);
pageController.execute();
} finally {
thread.setContextClassLoader(oldLoader);
}
That way, any dependent classes would get picked up properly even if
using reflection.
> This makes sure that all operations in the
> PageController has access to the other controller-classes as well. The
> controller will see a variable called "session", that is basically a
> HashMap set as an attribute in the real HttpSession object. This HashMap
> will often contain variables that can only be serialized/deserialized
> using the same classloader that instantiated the PageController.
>
> Maybe a better route is to configure my own serializer/deserializer? If
> I use a custom ObjectInputStream that overrides the loadClass() method
> and delegates to my special classloader, I should be home free. Is it
> possible to configure custom serializers in Resin? (I'm Running Resin
> Pro 4.0.17 2CPU).
Well, for 4.0.18, one of the bugs/features we need to put in is a way to
customize the persistence (primarily for jdbc-style sessions, but I
believe some others want to customize the capability.)
So I can keep this use-case in mind when I put together that API.
But it might be cleaner to use the ContextClassLoader pattern with a
session-config so you don't actually need to write a custom serializer.
-- Scott
> -- Edvin
>
>
>
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