Download COM and .NET Component Services by Juval Löwy PDF

By Juval Löwy

This publication discusses COM+ part providers. every one carrier is
covered in its personal bankruptcy, and every bankruptcy discusses a similar
range of concerns: the matter the provider addresses, possible
solut ions to that challenge, an in-depth description of the COM+
solut ion, tradeoffs, layout, and implementat ion directions, counsel, and
known pit falls. i've got t ried to supply worthy layout informat ion and
lessons I discovered whereas utilizing COM+. I additionally descr ibe COM+ helper
classes and ut ilit ies I constructed that would increase your productivity
significantly. (The COM+ occasions helper items and the COM+
Logbook are top examples.) This publication makes a speciality of the «how to»—
that is, it presents functional info. you might want to learn the
chapters so as , when you consider that so much 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 comprehend what COM+ is and the way to take advantage of it may learn this ebook and
star t constructing COM+ functions instantly.

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Example text

However, I r ecom m end t hat y ou avoid inst alling com ponent s from t he sam e DLL int o m ore t han one applicat ion, such as com ponent s B and C in Figure 1- 8. The reason is t hat com ponent s in t he sam e applicat ion ar e assum ed t o operat e t ight ly t oget her and t r ust each ot her . On t he ot her hand, not hing is assum ed about com ponent s fr om different applicat ions. By placing com ponent s from t he sam e DLL int o m ult iple applicat ions, y ou m ay int r oduce needless securit y checks.

Alm ost overnight , a new par adigm em erged— t he m ult it ier archit ect ur e . Scalabilit y is perhaps t he single m ost im port ant dr iv ing force behind t he m ov e fr om classic t wo- t ier client / server t o m ult it ier applicat ions. Today , being able t o handle a very large num ber of client s is necessar y for surv iv al. The classic t wo- t ier m odel sim ply does not scale well from a few dozen client s t o t ens of t housands of client s ham m er ing on your syst em at peak load.

Obv iously, it would be best if t he obj ect could shar e a cont ext wit h t he client . Doing so would oblit erat e t he need for COM+ t o m ar shal calls from t he client t o t he obj ect , and t hus avoid having t o pay even t he slight per for m ance penalt y of light weight pr oxies. COM+ exam ines t he new ly cr eat ed obj ect ’s configur at ion in t he COM+ cat alog and com par es it wit h t he configurat ion ( or rat her, t he 47 cont ext at t ribut es) of t he cr eat ing client . I f t he client ’s cont ex t can provide t he obj ect w it h a sufficient runt im e envir onm ent for it s configurat ion, COM+ places t he obj ect in t he client ’s cont ex t .

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