All projects where I'm working to have all initializations and the complete
wire of the applications in its own specialized classes.
Application_Start has is "why"and it is:
guywire = ApplicationConfiguration.GetGuyWire();
guywire.Wire();
On Tue, Jun 29, 2010 at 12:44 AM, Vadim Chekan <[email protected]>wrote:
> On Jun 28, 4:00 pm, Fabio Maulo <[email protected]> wrote:
> > You can move any initialization outside your application, even better...
> you
> > should move it.
>
> Global contains Application_Start, why? :)))
> Wen saying that initialization should be moved out,we should consider
> what type/size of application we are talking about. One size does not
> fit all. There is no universal design pattern, all of them are applied
> within specific conditions.
>
> Moreover, I would argue that not application size, but initializations
> code size matters. If I have a zoo of components, many of which
> require initializations, I would become uncomfortable keeping all of
> them in Global, and I would definably do what you say: move init to a
> specialized class/function[s].
> Or if NH init is complicated, it deserves its own function/class.
> NFluent which will have long initialization is a good example to be
> moved to a separate class.
>
> At the same time, NH initialization is very important part of
> application. You need to glance through init routine to understand how
> application works. Hiding it behind injector will make program more
> difficult to understand.
> Injectors are like pills. They help when you are sick, but if you are
> taking them when you are healthy will only harm you.
>
> Another reason to keep init in its own class if, for example there is
> a possibility to have web and console/win-service application. Then
> init routine can be reused instead of copy-pasted.
> But again, there must be a requirement which makes you thinking you
> will need to reuse it and there must be expectation that init is
> complicated enough to make copy-paste looking bad.
>
> > You can easily inject the injector.
> > in web you can use HttpModule... why ?
> > WCF has "behaviors" configurable via XML... why ?
> > MVC has "ActionFilters" and "ControllerFactory".... why ?
>
> First of all, wcf is xml configurable on a pair with attribute
> configurable and imperative configurable.
> If xml would be the only true way, there would be only xml
> configuration.
>
> Who are the bad guys pushing MS to bad design? :)))
>
> The reason why all of them have xml configuration and use IoC pattern
> is that those frameworks are fundamental and as result, at least some
> projects will have a requirement: re-configuration without
> recompilation. Not all of them, but some.
> As being very flexible, IoC is a must in any modern fundamental
> framework.
>
> Now, when we are talking about a concrete web application, unlike a
> framework, usage scenarios are known fairly well, and generally
> speaking, we can not assume that reconfiguration without recompilation
> is required. In fact if applied without a need, IoC can lower
> application reliability. Compiler can not do static checks during
> compilation so it is easy to rename a class without noticing that it
> is referenced in well hidden injector xml. And the worst, you will not
> notice it until appropriate function is called. Run-time errors are
> nasty. So injectors are not so harmless to recommend them by default.
>
> > Somebody are pushing you to do the wrong thing ? arg!! such bad guys!!
>
> Let's stay focused on technical aspects of the question and please
> don't make assumptions that somebody pushes me.
>
> > With the argument "you app. can't work without NH" I saw NH calls in the
> > code behind, if that is good for you... well... good luck!!
>
> You are attributing me to something I haven't said nor implied.
>
> Vadim.
>
> > On Mon, Jun 28, 2010 at 2:48 PM, Vadim Chekan <[email protected]>
> wrote:
> > > I agree with Felipe,
> >
> > > 1. By moving persistence initialization into a separate http module
> > > nothing changes: you are still having persistence calls in
> > > presentation tier: HttpModule is part of presentation framework. May
> > > be you imply the fact that it allows you to remove NH from referenced
> > > assemblies? Then it does not remove dependency but creates an illusion
> > > of dependency being removed because your app won't even start without
> > > NH assembly.
> >
> > > 2. Often system components require initialization. In this case Global
> > > acts not as part of presentation tier, but as application start hook,
> > > where you put your init calls. For example in console application
> > > it'll be Main(), in Win Service it'll be OnStart. Moving init calls
> > > into HttpModule, which were not directly intended for initialization
> > > make program more difficult to read.
> >
> > > 3. I can think of legitimate reasons for removing binary dependency,
> > > for example application can use one of several persistence strategies.
> > > Then as architect you may feel bad about linking libraries which may
> > > be not used at all.
> > > In scenarios when NH is the only option, linking HN assembly is a good
> > > thing. And putting init call where it is expected to be is good too.
> >
> > > Vadim.
> >
> > > On Jun 26, 2:53 pm, nadav s <[email protected]> wrote:
> > > > no, its a matter of having a direct reference to the DAL or event
> worse,
> > > a
> > > > persistance tool that your dal uses, from the presentation layer. its
> a
> > > > basic 3 tier anti pattern.
> >
> > > > On Sun, Jun 27, 2010 at 12:22 AM, Felipe Oriani <[email protected]>
> > > wrote:
> > > > > Hi guys ... thanks for the awsers!
> >
> > > > > What is there any difference between I use an HttpModule or
> Global.asax
> > > > > (prerequest / postrequest) events ? one has more performace than
> the
> > > > > other?
> >
> > > > > On Sat, Jun 26, 2010 at 3:56 PM, John Davidson <
> [email protected]
> > > >wrote:
> >
> > > > >> Unfortunately there are _many_ samples on the Internet that show
> > > almost
> > > > >> the same initialization using the global.asax This use of an
> > > HttpModule for
> > > > >> this purpose needs to be described as a best practice for
> initializing
> > > a
> > > > >> session in NHibernate.
> >
> > > > >> John Davidson
> >
> > > > >> Sent from my iPad
> >
> > > > >> On 2010-06-26, at 11:55, nadav s <[email protected]> wrote:
> >
> > > > >> it has nothing to do with you're question, but i don't think its
> wise
> > > > >> putting this code in the global asax, and therefor making you're
> > > > >> presentation layer too much aware of you're persistancy.
> > > > >> you can write an HttpModule that does just that and register it in
> the
> > > web
> > > > >> config.
> >
> > > > >> On Sat, Jun 26, 2010 at 6:18 PM, Felipe Oriani < <
> [email protected]>
> > > > >> [email protected]> wrote:
> >
> > > > >>> Hi all, I'm developing an application using Asp.Net MVC. I've
> > > developed
> > > > >>> a session per Request... so when the browser request something
> from
> > > server,
> > > > >>> the app start an session.
> >
> > > > >>> By the way, I have a page in my website that each second does a
> > > > >>> asynchronous request by Json to take some information at cache
> (and
> > > the
> > > > >>> first time, the cache is loaded from database, by repositories
> using
> > > > >>> Nhibernate). Everything is fine, but when I see the application
> > > running with
> > > > >>> NHProf, I see all "ISession" per request ... but any command is
> > > executed
> > > > >>> (because I load a cache).
> >
> > > > >>> I wonder, if doing so may cause a problem in the future? Or, with
> > > many
> > > > >>> accesses the web application may become slow ?
> >
> > > > >>> At my global.asax I do this:
> >
> > > > >>> public override void Init()
> > > > >>> {
> > > > >>> base.Init();
> >
> > > > >>> PreRequestHandlerExecute += OpenNHibernateSession;
> > > > >>> PostRequestHandlerExecute +=
> DisposeNHibernateSession;
> > > > >>> }
> >
> > > > >>> private static void OpenNHibernateSession(object sender,
> > > > >>> EventArgs e)
> > > > >>> {
> > > > >>> if (RequestHelper.IsStaticFiles()) // ||
> > > > >>> RequestHelper.IsJson()) = to avoid calls Json if necessary, but
> i'll
> > > need
> > > > >>> use h in some called jsons
> > > > >>> return;
> >
> > > > >>> ManagedWebSessionContext.Bind(HttpContext.Current,
> > > > >>> _sessionFactory.OpenSession());
> > > > >>> }
> >
> > > > >>> private static void DisposeNHibernateSession(object
> sender,
> > > > >>> EventArgs e)
> > > > >>> {
> > > > >>> if (RequestHelper.IsStaticFiles()) // ||
> > > > >>> RequestHelper.IsJson())
> > > > >>> return;
> >
> > > > >>> var session =
> > > > >>> ManagedWebSessionContext.Unbind(HttpContext.Current,
> > > _sessionFactory);
> > > > >>> if (session != null)
> > > > >>> session.Dispose();
> >
> > > > >>> }
> >
> > > > >>> If someone can help-me... I'll! appreciate
> >
> > > > >>> PS: Sorry for my english!
> >
> > > > >>> Cheers
> >
> > > > >>> --
> > > > >>> ______________________________________
> > > > >>> Felipe B. Oriani
> > > > >>> <[email protected]>[email protected] |
> > > > >>> <http://www.felipeoriani.com.br>www.felipeoriani.com.br
> >
> > > > >>> "...Trabalhe quanto puder, tornando-se útil quanto possível..." ,
> por
> > > > >>> André Luiz
> >
> > > > >>> --
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> > > > > --
> > > > > ______________________________________
> > > > > Felipe B. Oriani
> > > > > [email protected] |www.felipeoriani.com.br
> >
> > > > > "...Trabalhe quanto puder, tornando-se útil quanto possível..." ,
> por
> > > André
> > > > > Luiz
> >
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> > Fabio Maulo
>
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