Hi Romain A follow up question. What will the difference between a @Singleton EJB and a @Statefull @ApplicationScoped EJB be? Is it only the fact that the latter will have a CDI-proxy in fron of the EJB-proxy but function wise they will work the same?
Regards Lars-Fredrik On Tue, Aug 26, 2014 at 4:50 PM, Romain Manni-Bucau <[email protected]> wrote: > Hi > > 2014-08-26 16:45 GMT+02:00 Lars-Fredrik Smedberg <[email protected]>: > > Hi > > > > I have a few questions on EJB, CDI and Concurrency when I read > > http://tomee.apache.org/examples-trunk/access-timeout/README.html, I > read > > > > - Concurrent access to a @Stateful bean is serialized by the container. > > > > I also understand that I can annotate the EJBs with any of the CDI-scopes > > (in my case I'm interested in @RequestScoped, @SessionScoped and > > @ApplicationScoped). > > > > Questions: > > > > 1. If I annotate the @Stateful bean with @RequestScoped I assume that I > get > > a separate bean instance for each call? Correct? > > yes > > > 2. If I annotate the @Stateful bean with @SessionScoped I assume that I > per > > sesion get a separate bean instance that allows concurrent calls withing > > that particular session without wait? Correct? > > you get one instance by session and calls are serialized if needed to > ensure thread safety > > > 3. If I annotate the @Stateful bean with @ApplicationScoped I assume > that I > > per application get one bean instance that allows concurrent calls > without > > wait? Correct? > > > > same as before, thread safety is ensured > > > The reason I ask is that as far as I understand CDI does not have any > > concurrency management but the EJB has. What will be the case when doing > as > > above? > > > > Please help me get some in-depth understanding on this. > > > > for @AppScoped => look @javax.ejb.Singleton and @Lock which is surely > better > > > Thanks > > Lars-Fredrik Smedberg > > > > > > > > -- > > Med vänlig hälsning / Best regards > > > > Lars-Fredrik Smedberg > > > > STATEMENT OF CONFIDENTIALITY: > > The information contained in this electronic message and any > > attachments to this message are intended for the exclusive use of the > > address(es) and may contain confidential or privileged information. If > > you are not the intended recipient, please notify Lars-Fredrik Smedberg > > immediately at [email protected], and destroy all copies of this > > message and any attachments. > -- Med vänlig hälsning / Best regards Lars-Fredrik Smedberg STATEMENT OF CONFIDENTIALITY: The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the address(es) and may contain confidential or privileged information. If you are not the intended recipient, please notify Lars-Fredrik Smedberg immediately at [email protected], and destroy all copies of this message and any attachments.
