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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m entering the world of Corba programming and wanted
to ask your group if it is “ok” to ask some very basic conceptual
questions….ones that are not usually found easily in books? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you in advance! Here goes…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Can Corba accommodate the
following? I have a need to advertise an object instance via
CORBA, whereby (depending upon which method and arguments are invoked), may
return simple primitives (strings, ints, arrays, etc), or sometimes act
like an object factory, that is…to dynamically create various object
instances (of possibly differing types), that are also referenced remotely
by the CORBA client. I’ve read a lot of how a
corba object is defined via IDL, then client and server stubs are created,
(that is, statically at compile time), but I am unaware if the CORBA
specification allows for corba object instances to act as a factory,
creating objects, then returning a reference to them. Right
now, I want to keep the object on the server, but return a reference <o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>If the above concepts possible,
are there standard/defined ways the client can learn of the methods (and
argument types) available in the new object reference? (called
introspection?)<o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I’m fairly certain that
data returned from corba objects must be of specific types defined in the IDL,
that is primitives (strings, ints, floats, etc), and some collection types
(arrays, lists, etc)……but no serialized objects.
In other words, I don’t think CORBA has a notion of a generic object
type that is movable (via serialization) from ORB to ORB. Is
this correct? (or am I horribly mistaken?)<o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>If the above concepts possible,
are there standard/defined ways the client can learn of the methods (and
argument types) available in the new object reference? (called
introspection?)<o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Again, if this is all possible,
does the CORBA-specifications (or even implementations) provide a means to
specify and identify the life-span of objects (dynamic or otherwise).
In other words, can an objects lifespan be defined by some set of rules or
parameters? For instance, if an object was created dynamically, would
it be possible to set it’s lifetime to 1) the lifetime of the TCP
connection between client/server? 2) lifetime due to inactivity, 3)
lifetime due to infrequent use, or any other constraint? I do
not hear much about how objects are retired or collected on the server. <o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='mso-list:l1 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Is it normal for Corba clients
and ORBS to communicate on top of TLS/SSL to help keep the network secure
a little? I don’t hear much talk on this subject either.<o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you for taking the time to read this long
description - largely due to my inexperience with the technology.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Knd regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>PEter<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>\<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>a reference to new object instances (of possibly
different types). I’m not sure if a corba object
implementation is permitted (in existing CORBA technology) to create ) <o:p></o:p></span></font></p>
</div>
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