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<a name="Partition-Attribute-Main"></a>
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<p>
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<hr>
<a name="Partition-Attribute-Main-1"></a>
<h4 class="subsubsection">8.5.4.6 Partition Attribute Main</h4>

<p>Basically, the distributed system annex (DSA) helps the user in building
a distributed application from a non-distributed application (Of course,
this is not the only possible model offered by DSA). The user can
design, implement and test his application in a non-distributed
environment, and then should be able to switch from the non-distributed
case to a distributed case. As mentioned before, this two-phase design
approach has several advantages.
</p>
<p>In a non-distributed case, the user executes only one main executable
possibly with a name corresponding to the main unit name of his
application. With <tt>po_gnatdist</tt>, in a distributed case, a main executable
with a name corresponding to the main unit name is responsible for
starting the entire distributed application. Therefore, the user can
start his application the same way he used to do in the non-distributed
case.
</p>
<p>For this reason, the configuration language provides a way to declare
the main procedure of the non-distributed application.
</p>
<div class="smallexample">
<pre class="smallexample">

MAIN_PROCEDURE_IDENTIFIER ::=
  ADA_UNIT
MAIN_PROCEDURE_DECLARATION ::=
   <b>procedure</b> MAIN_PROCEDURE_IDENTIFIER <b>is in</b> PARTITION_IDENTIFIER;

</pre></div>

<p>In this case, the partition in which the main procedure has been mapped
is called the main partition. It includes in its code a call to this
main procedure. The main partition has an additional specific role,
because the boot server is located on it (see <a href="PolyORB-PCS-Internals.html#PolyORB-PCS-Internals">PolyORB PCS Internals</a>).
</p>
<p>The main procedures for the other partitions have a null body. However,
the user can also modify this behavior by providing an alternate main
procedure. To do this, an alternate main subprogram has to be declared
and assigned to the partition Main attribute.
</p>
<div class="smallexample">
<pre class="smallexample">

PROCEDURE_DECLARATION ::=
   <b>procedure</b> PROCEDURE_IDENTIFIER;

REPRESENTATION_CLAUSE ::=
   <b>for</b> PARTITION_IDENTIFIER'Main <b>use</b> PROCEDURE_IDENTIFIER;

</pre></div>

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