stateful

What are good wrappers to transfer state change in haskell?

What are good wrappers to transfer state change in haskell?
I am trying to implement a simple FRP backend, for my own interest.I decided to use pure functions: so, no IO in the core. The implementation is based on signal transformer.I already have tried two ways:newtype SF a b = SF { listen :: [a] -> [b] }htt

Correct usage of Stateful Beans with Servlets

Correct usage of Stateful Beans with Servlets
We currently have a Stateful bean that is injected into a Servlet. The problem is that sometimes we get aCaused by: javax.ejb.ConcurrentAccessException: SessionBean is executing another request. [session-key: 7d90c02200a81f-752fe1cd-1]when executing
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