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<a name="Remote-Access-to-Subprograms-_0028RAS_0029"></a>
<div class="header">
<p>
Next: <a href="Remote-Access-to-Class-Wide-Types-_0028RACW_0029.html#Remote-Access-to-Class-Wide-Types-_0028RACW_0029" accesskey="n" rel="next">Remote Access to Class Wide Types (RACW)</a>, Previous: <a href="Regular-Remote-Subprograms-_0028RCI_0029.html#Regular-Remote-Subprograms-_0028RCI_0029" accesskey="p" rel="prev">Regular Remote Subprograms (RCI)</a>, Up: <a href="Pragma-Remote_005fCall_005fInterface.html#Pragma-Remote_005fCall_005fInterface" accesskey="u" rel="up">Pragma Remote_Call_Interface</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="Remote-Access-to-Subprograms-_0028RAS_0029-1"></a>
<h4 class="subsubsection">8.1.4.3 Remote Access to Subprograms (RAS)</h4>

<p>In the following example, several mirroring banks offer their services
through the same database. Each bank registers a reference to each of
its services with a central bank. A client of the central bank requests
a service from one of the mirroring banks. To satisfy requests, the RCI
unit RASBank defines Balance_Type, a remote access to subprogram. (Recall
that an access type declared in a remote unit has to be either remote
access to subprogram or remote access to class wide type).
</p>
<p>Note that to obtain a remote access to subprogram, the subprogram that
delivers the remote access must be remote itself. Therefore, MirrorBank
is a RCI library unit.
</p>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> Types; <b>use</b> Types;
<b>package</b> RASBank <b>is</b>
   <b>pragma</b> Remote_Call_Interface;

   <b>type</b> Balance_Type <b>is</b> <b>access</b> <b>function</b>
     (Customer : <b>in</b> Customer_Type;
      Password : <b>in</b> Password_Type)
      <b>return</b> Integer;

   <b>procedure</b> Register
      (Balance : <b>in</b> Balance_Type);

   <b>function</b> Get_Balance
      <b>return</b> Balance_Type;

   --  [...] Other services
<b>end</b> RASBank;

</pre></div>

<p>In the code below, a mirroring bank registers its services to the
central bank.
</p>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> Types; <b>use</b> Types;
<b>package</b> MirrorBank <b>is</b>
   <b>pragma</b> Remote_Call_Interface;

   <b>function</b> Balance
     (Customer : <b>in</b> Customer_Type;
      Password : <b>in</b> Password_Type)
      <b>return</b> Integer;

   --  [...] Other services
<b>end</b> MirrorBank;

</pre></div>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> RASBank, Types; <b>use</b> RASBank, Types;
<b>package</b> <b>body</b> MirrorBank <b>is</b>

   <b>function</b> Balance
     (Customer : <b>in</b> Customer_Type;
      Password : <b>in</b> Password_Type)
      <b>return</b> Integer <b>is</b>
   <b>begin</b>
      <b>return</b> Something;
   <b>end</b> Balance;

<b>begin</b>
   --  Register a dynamically bound remote subprogram (Balance)
   --  through a statically bound remote subprogram (Register)
   Register (Balance'Access);
   --  [...] Register other services
<b>end</b> MirrorBank;

</pre></div>

<p>In the code below, a central bank client asks for a mirroring bank and
calls the Balance service of this bank by dereferencing a remote access
type.
</p>
<div class="smallexample">
<pre class="smallexample">
<b>with</b> Types; <b>use</b> Types;
<b>with</b> RASBank; <b>use</b> RASBank;
<b>procedure</b> BankClient <b>is</b>
   B : Integer;
   C : Customer_Type := &quot;rich&quot;;
   P : Password_Type := &quot;xxxx&quot;;
<b>begin</b>
   --  Through a statically bound remote subprogram (Get_Balance), get
   --  a dynamically bound remote subprogram. Dereference it to
   --  perform a dynamic invocation.
   B := Get_Balance.<b>all</b> (C, P);
<b>end</b> BankClient;

</pre></div>


<hr>
<div class="header">
<p>
Next: <a href="Remote-Access-to-Class-Wide-Types-_0028RACW_0029.html#Remote-Access-to-Class-Wide-Types-_0028RACW_0029" accesskey="n" rel="next">Remote Access to Class Wide Types (RACW)</a>, Previous: <a href="Regular-Remote-Subprograms-_0028RCI_0029.html#Regular-Remote-Subprograms-_0028RCI_0029" accesskey="p" rel="prev">Regular Remote Subprograms (RCI)</a>, Up: <a href="Pragma-Remote_005fCall_005fInterface.html#Pragma-Remote_005fCall_005fInterface" accesskey="u" rel="up">Pragma Remote_Call_Interface</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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