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<a name="Application-Startup"></a>
<div class="header">
<p>
Next: <a href="Heterogeneous-System.html#Heterogeneous-System" accesskey="n" rel="next">Heterogeneous System</a>, Previous: <a href="PolyORB-PCS-Internals.html#PolyORB-PCS-Internals" accesskey="p" rel="prev">PolyORB PCS Internals</a>, Up: <a href="PolyORB-PCS-Internals.html#PolyORB-PCS-Internals" accesskey="u" rel="up">PolyORB PCS Internals</a> &nbsp; [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Application-Startup-1"></a>
<h4 class="subsubsection">8.5.7.1 Application Startup</h4>

<p>A name server normally needs to be started prior to starting any application
partition. Once the name server is started, its location must be passed
to all partitions as the <tt>name_service</tt> runtime parameter in the
<tt>[dsa]</tt> section of the configuration. When using an Ada starter, it is
sufficient to pass the name server location to the starter, and it will be
propagated automatically to all partitions. When using an embedded name
server, the name server is part of the main partition, and does not need
to be passed explicitly.
</p>
<p>Upon elaboration, each partition registers its RCI packages with the
name server. Once this is done, remote calls to RCI subprograms can proceed.
Partitions cache the replies from the name server so that during the
course of normal execution, inter-partition calls only involve the caller
and callee partitions (not the name server).
</p>
<p>When the name server kind is set to None, no name server is started, and
no attempt is made to register RCI units. Their locations must then be
set in the <tt>po_gnatdist</tt> configuration file using Self_Location attributes
for all partitions, or overridden in run-time configuration by setting the
<tt>&lt;partition&gt;'location</tt> parameter in the <tt>[dsa]</tt> section. A location
pair <tt>(&lt;protocol-name&gt;, &lt;protocol-data&gt;)</tt> is encoded as a URI:
<tt>&lt;protocol-name&gt;://&lt;protocol-data&gt;</tt>.
</p>
<p>For example, to specify that a partition <tt>server_part</tt> is to be reachable
using TCP on host <tt>somehost</tt>, port 5555, either use the following
setting in the <tt>gnatdist</tt> configuration file:
</p>
<div class="smallexample">
<pre class="smallexample">   for server_part'Self_Location use (&quot;tcp&quot;, &quot;somehost:5555&quot;);
</pre></div>

<p>or the following settings in PolyORB runtime configuration:
</p>
<div class="smallexample">
<pre class="smallexample">[dsa]
server_part'location=tcp://somehost:5555
</pre></div>

<p>RCI units then act as &ldquo;clearinghouses&rdquo; for other partitions to exchange
RACWs and set up dynamic communication paths.
</p>
<hr>
<div class="header">
<p>
Next: <a href="Heterogeneous-System.html#Heterogeneous-System" accesskey="n" rel="next">Heterogeneous System</a>, Previous: <a href="PolyORB-PCS-Internals.html#PolyORB-PCS-Internals" accesskey="p" rel="prev">PolyORB PCS Internals</a>, Up: <a href="PolyORB-PCS-Internals.html#PolyORB-PCS-Internals" accesskey="u" rel="up">PolyORB PCS Internals</a> &nbsp; [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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