Stateless scope
---------------
Key: WELD-830
URL: https://issues.jboss.org/browse/WELD-830
Project: Weld
Issue Type: Feature Request
Components: Scopes & Contexts
Reporter: Adam Warski
>From a discussion on weld-dev
>(http://lists.jboss.org/pipermail/weld-dev/2011-January/002825.html):
Here's my use-case:
I have some beans which are inherently stateless, e.g. "services" or factory
methods. The only fields they have are injected. I am using these beans in
normal-scoped passivation-capable beans, e.g. session or conversation scoped.
In such case, they also have to be passivation-capable, which means either
(a) be normal-scoped (proxyable)
(b) implement Serializable and leave the bean dependent-scoped
If I go with (a) this means that I'd have to put my bean in the request,
session, conversation or application scope. However none of these choices make
much sense, as they indicate the my beans holds request/session/etc-scoped data
- which it doesn't, as it is stateless.
So I am left with (b) - implement Serializable + dependent scope. But is that
the right thing to do always? Firstly, if I have a lot of such stateless beans,
which are injected one into another, serializing a simple session-scope bean
may mean that half the beans in my application get serialized. Secondly, a
developer looking at such a bean could wonder why is this bean serializable?
Esp if it doesn't have any state?
Hence what I'd like in fact is a proxyable scope (normal), which on
serialization would only write the proxy information, on de-serialization would
inject a new instance of the bean (or from a pool), and on injection would
either behave as dependent (new instance), or take beans from a pool. Just as
the EJB Stateless scope (except that I don't want to make my bean an EJB).
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