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<title>PolyORB User&rsquo;s Guide: Location Declaration</title>

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<a name="Location-Declaration"></a>
<div class="header">
<p>
Next: <a href="Partition-Attribute-Main.html#Partition-Attribute-Main" accesskey="n" rel="next">Partition Attribute Main</a>, Previous: <a href="Partition-Declaration.html#Partition-Declaration" accesskey="p" rel="prev">Partition Declaration</a>, Up: <a href="The-Configuration-Language.html#The-Configuration-Language" accesskey="u" rel="up">The Configuration Language</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="Location-Declaration-1"></a>
<h4 class="subsubsection">8.5.4.5 Location Declaration</h4>

<p>There are several kinds of location in the configuration
language. We shall present them in the next subsections, but here is a
short overview of these locations:
</p>
<ul>
<li> Boot_Location defines the network locations to use to communicate
with the the boot server during the boot phase

</li><li> Self_Location defines the network locations to use by others
to communicate with the current partition

</li><li> Data_Location defines the data storage location used by the
current partition to map its shared passive units

</li></ul>

<p>A location is composed of a support name and a specific data for this
support. For instance, a network location is composed of a protocol name
like <i>tcp</i> and a protocol data like <i>&lt;machine&gt;:&lt;port&gt;</i>. A storage
location is composed of a storage support name like <i>dfs</i> (for
Distributed File System) and a storage support data like a directory
<i>/dfs/glade</i>.
</p>
<div class="smallexample">
<pre class="smallexample">
LOCATION      ::= ([Support_Name =&gt;] STRING_LITERAL,
                   [Support_Data =&gt;] STRING_LITERAL)

LOCATION_LIST ::= (LOCATION [,LOCATION)])

</pre></div>

<p>Note that a location may have an undefined or incomplete support
data. In this case, the support is free to compute a support data. For
instance, (&quot;tcp&quot;, &quot;&quot;) specifies that the protocol is used but that the
protocol data <i>&lt;machine&gt;:&lt;port&gt;</i> is to be determined by the protocol
itself.
</p>
<p>A location or a list of locations can be can be concatenated into a
single string to be used as a command line option or an environment
variable (see <a href="Partition-Runtime-Parameters.html#Partition-Runtime-Parameters">Partition Runtime Parameters</a>).
</p>
<p>If a partition wants to communicate with another partition once the
location list of the latter is known, the caller will use the first
location of the callee whose protocol is locally available. For
instance, if a callee exports three locations (&quot;N1&quot;, &quot;D1&quot;), (&quot;N2&quot;, &quot;D2&quot;)
and (&quot;N3&quot;, &quot;D3&quot;), a caller with protocols N2 and N3 locally available
will try to communicate with the callee using the protocol of name N2
and of specific data D2.
</p>
<hr>
<div class="header">
<p>
Next: <a href="Partition-Attribute-Main.html#Partition-Attribute-Main" accesskey="n" rel="next">Partition Attribute Main</a>, Previous: <a href="Partition-Declaration.html#Partition-Declaration" accesskey="p" rel="prev">Partition Declaration</a>, Up: <a href="The-Configuration-Language.html#The-Configuration-Language" accesskey="u" rel="up">The Configuration Language</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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