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<title>Persistent CORBA objects</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>creating a persistent
CORBA object usually requires setting the lifespan and id assignment policy of
the POA.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>You can either create a new
POA with the desired policies like this:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'>orb =
CORBA.ORB_init(sys.argv)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'>poa =
orb.resolve_initial_references("RootPOA")<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'>policies = [
poa.create_lifespan_policy(PortableServer.PERSISTENT),<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'> poa.create_id_assignment_policy(PortableServer.USER_ID)
]<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'>poa =
poa.create_POA("MyPOA", None, policies)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>or use omniORB’s
special POA named “omniINSPOA” which already has these policies
set:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'>orb =
CORBA.ORB_init(sys.argv)<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=4 face="Courier New"><span
lang=EN-GB style='font-size:13.0pt;font-family:"Courier New"'>poa =
orb.resolve_initial_references("omniINSPOA")<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>When you activate the
servant in this POA you have to specify the object id:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=4 face="Courier New"><span lang=EN-GB
style='font-size:13.0pt;font-family:"Courier New"'>id = "MyObjectId" <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=4 face="Courier New"><span lang=EN-GB
style='font-size:13.0pt;font-family:"Courier New"'>poa.activate_object_with_id(id,
servant)</span></font><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Finally you must specify
the server’s endpoint address by the –ORBendPoint parameter, like in
this example:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=4 face="Courier New"><span lang=EN-GB
style='font-size:13.0pt;font-family:"Courier New"'>python MyServer.py –ORBendPoint
::localhost:5555 <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>The benefit of using
omniINSPOA (besides simplicity) is that your object is not only persistent, but
also supports the corbaloc object resolution scheme.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>This example object can be
resolved by:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=4 face="Courier New"><span lang=EN-GB
style='font-size:13.0pt;font-family:"Courier New"'>orb.string_to_object("corbaloc:iiop:localhost:5555/MyObjectId”)<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Clemens<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Von:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
omniorb-list-bounces@omniorb-support.com
[mailto:omniorb-list-bounces@omniorb-support.com] <b><span style='font-weight:
bold'>Im Auftrag von </span></b>Daschner, Stefan<br>
<b><span style='font-weight:bold'>Gesendet:</span></b> Donnerstag, 1. März 2007
11:16<br>
<b><span style='font-weight:bold'>An:</span></b>
omniorb-list@omniorb-support.com<br>
<b><span style='font-weight:bold'>Betreff:</span></b> [omniORB] Persistent
CORBA objects</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hello,</span></font>
<o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>does
anybody know how to make a CORBA object persistent ?</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>What I
found in the documentation is that the POA’s Lifespan Policy determines </span></font><br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>whether
objects created within it are transient or persistent.</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>But
how can I set the POA’s Lifespan Policy ?</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I'm
using omniORBpy-3.0-rc1.</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks,
Stefan</span></font> <o:p></o:p></p>
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