By Juval Löwy
This booklet discusses COM+ part companies. each one provider is
covered in its personal bankruptcy, and every bankruptcy discusses a similar
range of concerns: the matter the carrier addresses, possible
solut ions to that challenge, an in-depth description of the COM+
solut ion, tradeoffs, layout, and implementat ion directions, assistance, and
known pit falls. i've got t ried to supply beneficial layout informat ion and
lessons I discovered whereas utilizing COM+. I additionally descr ibe COM+ helper
classes and ut ilit ies I constructed that might improve your productivity
significantly. (The COM+ occasions helper items and the COM+
Logbook are top examples.) This e-book specializes in the «how to»—
that is, it offers functional info. you want to learn the
chapters so as , because such a lot chapters depend on details discussed
in the previous chapters. The booklet additionally goals to provide an explanation for COM+ step
by step. A software program engineer already conversant in COM who wants
to understand what COM+ is and the way to exploit it could possibly learn this ebook and
star t constructing COM+ functions instantly.
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This publication discusses COM+ part prone. every one carrier iscovered in its personal bankruptcy, and every bankruptcy discusses a similarrange of concerns: the matter the provider addresses, possiblesolut ions to that challenge, an in-depth description of the COM+solut ion, tradeoffs, layout, and implementat ion directions, suggestions, andknown pit falls.
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Extra info for COM and .NET Component Services
When debugging a com ponent in a ser ver applicat ion, y ou can st ep int o t he com ponent ’s code fr om t he t est client side in t wo w ay s. Fir st , y ou can st ar t t he client pr oj ect in t he debugger, break at a line where y ou call a m et hod on a com ponent in t he ser ver applicat ion, and sim ply st ep int o it ( F11 in Visual C+ + or F8 in Visual Basic) . This process launches a new inst ance of t he debugger and at t aches it t o t he running dllhost cont aining your com ponent .
Dealing w it h pooled obj ect s is anot her sit uat ion r equiring m anual m arshaling, as you will see in t he nex t chapt er . Classic COM requires t hat all cross- apart m ent calls be m arshaled, even when t he call is in t he sam e pr ocess, t o ensure t hr eading m odel com pat ibilit y. The classic COM m echanism s for m anually m ar shaling int erface point ers acr oss apart m ent boundaries hav e been m ade cont ex t- aware. They are what you should use t o m ar shal int erface point ers m anually across cont ext boundar ies w it h COM+ .
COM+ t hen places a proxy in t he client process and a st ub in t he surr ogat e process t o connect t he client t o t he obj ect . You can hav e m ult iple inst ances of t he dllhost process running on your m achine sim ult aneously; if client s have cr eat ed obj ect s from different server applicat ions, each ser ver applicat ion get s it s own inst ance of dllhost . To verify t hese point s yourself, configure t he Hello COM+ exam ple t o r un as a serv er applicat ion. Run t he t est client again, cr eat e t he obj ect , and call t he ShowMessage( ) m et hod, but do not press t he OK but t on.