Re: .Net COM+
From: Sahil Malik (contactmethrumyblog_at_nospam.com)
Date: 09/24/04
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Date: Fri, 24 Sep 2004 16:56:55 -0400
Allright, undocumented feature and you didn't hear this from me. It is
possible, write your own IUnknown to expose a programmatic interface to
check the reference count. .. actually, in QueryInterface, if you write some
hacking code, then when IE downloads an activeX control and popsup that
dialog to prompt you to install with an invalid certificate, you could have
theoretically already run weird code on the system without the user knowing
it (I am pretty sure this works since I have tried it though I am surprised
why nobody has used this as a hack exploit yet, but the last time I tried it
was on Win98, maybe things are different now - though I'd be really
surprised !!).
For all practical purposes - not possible. Especially if you are using the
standard ATL VC++ or VB 6 way to create a COM component. Those methods wrap
a COM component so well that you never deal with IUnknown implementation at
it's base level.
.. to answer your other question ---
I like to use COM+ when I am interoping. THis simply because COM's memory
management leaves a lot to be desired (Reference counts isn't perfect,
especially when references can get circular), so with COM+ I can pool
instances and I can put an upper limit on the number of instances hence
prevent an infinite memory leak to control damage basically. Also, a rogue
COM component can be simply disabled, and well things can be easily exposed
thru SOAP, things can be put in MTS to make a distributed package,
transaction features can be used .. it's a lot of good features in an
enterprise environment. What's more, all of these can be done
programatically, declratively and administratively .. and that's just
awesome dude !!
This is one of those things that has as many views as many developers, but I
for one am a big proponent of COM+/Enterprise Services in general.
- Sahil Malik
You can reach me thru my blog at
http://www.dotnetjunkies.com/weblog/sahilmalik
"Sam Santiago" <ssantiago@n0spam-SoftiTechture.com> wrote in message
news:u5Jl%23NgoEHA.1608@TK2MSFTNGP15.phx.gbl...
> In short, no. There's no tool to view or manage non-serviced .NET
> components. Yes it is fine to run middle tier objects outside of COM+.
> COM+ usages requires COM interop calls so there's a performance hit. Many
> do not recommend using COM+/Enterprise Services unless you truly need some
> of the services its provides such as:
>
> 1) Distributed Transactions - your application needs to update multiple
> databases in a transaction.
> 2) Object Pooling - for performance you want to have several instances
of
> an object handling clients.
> 3) Declarative transaction management - you do not want to handle
> transaction mgmt in your code and want to be able to configure it a
> deployment or declaratively with attributes.
>
> This article has a nice table summarizing the services provide by COM+:
>
> Using COM+ Service in .NET
>
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/comservnet.asp?frame=true
>
> Thanks,
>
> Sam
> --
> _______________________________
> Sam Santiago
> ssantiago@n0spam-SoftiTechture.com
> http://www.SoftiTechture.com
> _______________________________
> "Thomas" <thomas@corpuslogic.com> wrote in message
> news:uc5Eu6XoEHA.2068@TK2MSFTNGP09.phx.gbl...
> > Hi,
> >
> > I did formulate my question well, what I was thinking: Is there a tool
for
> > managing non-serviced .Net components. Is it even advisable to run
middle
> > tier components ouside COM+ and what are the problems?
> >
> > "Paul Glavich [MVP - ASP.NET]" <glav@aspalliance.com-NOSPAM> wrote in
> > message news:uQVmngWoEHA.3592@TK2MSFTNGP14.phx.gbl...
> > > The Component Services MMC snap in that is usually located at Start ->
> > > Programs -> Administrative Tools -> Component Services
> > > should provide all of that.
> > >
> > > --
> > > - Paul Glavich
> > > Microsoft MVP - ASP.NET
> > >
> > >
> > > "Thomas" <thomas@corpuslogic.com> wrote in message
> > > news:eIssHJRoEHA.3592@TK2MSFTNGP14.phx.gbl...
> > > > Hi,
> > > >
> > > > What is the tool for managing .Net components much like Component
> > Services
> > > > for COM+?
> > > >
> > > > I want to see # in call, call times and # instances with a tool or
> > > > framework - which?
> > > >
> > > > Thomas
> > > >
> > > >
> > >
> > >
> >
> >
>
>
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