Just finishing an intro book to VB programming; I covered basics on how
to due this or that for services and components. However, I'm still
wondering the following. What's the main advantage or reason to use:
web service, system service, or component? What advantages does one
have over the other? They all seem to expose methods that can be used
one way or another.
4  996 
they are all twists on the same idea: reusable "components "
web services are generally used when cross-platform access is needed --
the format is generally XML/SOAP and as such is ideal for heterogeneous
interoperabilit y (examples would be a weather service, a stock quote
service, etc.)
remoting services tend to be used for windows/.net to windows/.net
functionality -- they offer some security features not normally found
in webservices and also allow some client-side control of the lifetime
of the server object... also, they can be exposed by IIS, and at times
can use non-default constructors
a windows service generally is not accessible from anywhere but the
machine on which it runs. they are useful for scenarios lie offline
data processing (e.g. I frequently use a FileSystemWatch er that updates
a database when a datafile is saved in a particular directory)
a serviced component (COM+) offers a different security model and is
accessible from non .NET code. it offers certain features like message
queueing, transactional processing, etc.
normally a specific design need will eliminate certain possibilities.
the 70-310 course books from both Microsoft and Que provide a good
starting point.
stand__sure wrote: they are all twists on the same idea: reusable "components "
web services are generally used when cross-platform access is needed --
the format is generally XML/SOAP and as such is ideal for heterogeneous
interoperabilit y (examples would be a weather service, a stock quote
service, etc.)
remoting services tend to be used for windows/.net to windows/.net
functionality -- they offer some security features not normally found
in webservices and also allow some client-side control of the lifetime
of the server object... also, they can be exposed by IIS, and at times
can use non-default constructors
a windows service generally is not accessible from anywhere but the
machine on which it runs. they are useful for scenarios lie offline
data processing (e.g. I frequently use a FileSystemWatch er that updates
a database when a datafile is saved in a particular directory)
a serviced component (COM+) offers a different security model and is
accessible from non .NET code. it offers certain features like message
queueing, transactional processing, etc.
normally a specific design need will eliminate certain possibilities.
the 70-310 course books from both Microsoft and Que provide a good
starting point.
Thanks so much for the useful info. I still have lots of questions but
that definitely helps. What I'm mainly interested in is learning about
transactions within a closed domain. I'm not sure about the COM+ vs.
remoting but I'm thinking remoting is the next topic for me to learn
about. I'll keep the 70-310 course books in mind.
stand__sure wrote: you'll actually want to learn about both then...
Good news, though!
(Thankfully) COM objects inherit from ServicedCompone nt which inherits
from ContextBoundObj ect which inherits from MarshalByRefObj ect (which
is the object from which a remotable object must inherit). so, what
you learn about remoting will be of use when doing COM+! You'll need
COM+ for doing transactions.
two decent articles are
http://whidbey.msdn.microsoft.com/li...remotearch.asp
and
http://whidbey.msdn.microsoft.com/li...et05272003.asp
Thanks once again. I appreciate the time you invested directing me to
useful info.. I'll put it to good use. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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