Stateful uses some more complex mechanisms. So i imagine there is an
overhead.
I never did any benchmarks using stateful with 5000 virtual users. May be
David can give us some hints?
Jean-Louis
is_maximum wrote:
>
> Thanks, do you know if there is any overhead using stateful SBs? And does
> this degrade the performance?
> There are many such services and in real word our application may serve
> more than 5000 users.
>
>
>
> Jean-Louis MONTEIRO wrote:
>>
>> Hi,
>>
>> In my opinion you are not guaranty to get the same instance of a
>> stateless session bean between invocation (a stateful is better for
>> that).
>> In OpenEJB the bean instance is retrieved from the pool at the beginning
>> of the invocation and returned to the pool at the end of the invocation.
>>
>> Jean-Louis
>>
>>
>> is_maximum wrote:
>>>
>>> Hello
>>>
>>> We have a stateless SB with three method: preProcess, process and
>>> postProcess
>>> Normally when I use this EJB in another SB I call these methods as
>>> follows:
>>>
>>> public class AnotherEJB {
>>>
>>> @EJB
>>> private SessionBean sessionBean;
>>>
>>> public void someMethod() {
>>> sessionBean.preProcess();
>>> sessionBean.process();
>>> sessionBean.postProcess();
>>> }
>>>
>>> }
>>> this works fine and it seems the state of that bean is kept the same.
>>> My question is if a delay occurs between these three methods, will
>>> container assign this stateless to another thread to serve incoming
>>> request and after this delay say process() method is called it might be
>>> another session bean instance? To clarify my question look at following
>>> code:
>>>
>>> public void someMethod() {
>>>
>>> sessionBean.preProcess();
>>>
>>> //calling another method which takes too long to complete, and
>>> during this method container
>>> // is receiving another request in which sessionBean is invoked
>>> doSomethingMassive();
>>>
>>> sessionBean.process(); //is this the same instance of sessionBean
>>> that already invoked preProcees() method above?
>>>
>>> perhapsDoSomethingElse(); //another method
>>>
>>> sessionBean.postProcess();
>>>
>>> }
>>>
>>>
>>> can anyone please help me on this?
>>>
>>> }
>>>
>>>
>>
>>
>
>
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