EJB and none Thread safe legacy code

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2 total messages Started by wilhelm Thu, 18 Oct 2001 23:22

#244

Author: wilhelm
Date: Thu, 18 Oct 2001 23:22

19 lines
1854 bytes

I have a dll which is not thread safe -> legacy code (c/c++/fortran)
Is there a way of importing the JNI/DLL so each Statefull Session Bean
user
can concurrently access to it ?

DLL are load in the process space, so there is one load per
Application Server
This mean that I can have one user at a time....this does not seem a
good design, isn't it?

Can I spawn a process with each statefull EJB. This process will
communicate via RMI and follow the exact same life-cycle state machine
as the Statefull Session Bean, this should work, isn't it ?

Other idea ?

Thanks

Wilhelm

Re: EJB and none Thread safe legacy code

#245

Author: Bengt B�verman
Date: Tue, 23 Oct 2001 18:03

35 lines
2742 bytes

Actually EJB components are NOT ALLOWED to call native methods. You can find
this in the back
pages of the EJB specification.

What you could do is open a socket to another program, outside the EJB
container and JVM, that
has loaded the DLL and can handle that logic, and communicate with it.
Unfortunately you wouldn't gain much from using
EJB in that case, unless you already have clients calling EJB components.


/BengtB


"wilhelm" <wilhelmt@mdli.com> wrote in message
news:d1d4144b.0110181522.21332a64@posting.google.com...
> I have a dll which is not thread safe -> legacy code (c/c++/fortran)
> Is there a way of importing the JNI/DLL so each Statefull Session Bean
> user
> can concurrently access to it ?
>
> DLL are load in the process space, so there is one load per
> Application Server
> This mean that I can have one user at a time....this does not seem a
> good design, isn't it?
>
> Can I spawn a process with each statefull EJB. This process will
> communicate via RMI and follow the exact same life-cycle state machine
> as the Statefull Session Bean, this should work, isn't it ?
>
> Other idea ?
>
> Thanks
>
> Wilhelm

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