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<h1>Module <a href="type_Rpc_netplex.html">Rpc_netplex</a></h1>
<pre><span id="MODULERpc_netplex"><span class="keyword">module</span> Rpc_netplex</span>: <code class="code">sig</code> <a href="Rpc_netplex.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Netplex support for RPC servers (TCP only)</p>
</div>
</div>
<hr width="100%">
<pre><span id="VALrpc_factory"><span class="keyword">val</span> rpc_factory</span> : <code class="type">configure:(<a href="Netplex_types.config_file-c.html">Netplex_types.config_file</a> -> <a href="Netplex_types.html#TYPEaddress">Netplex_types.address</a> -> 'a) -><br> ?socket_config:('a -> <a href="Rpc_server.socket_config-c.html">Rpc_server.socket_config</a>) -><br> ?hooks:('a -> <a href="Netplex_types.processor_hooks-c.html">Netplex_types.processor_hooks</a>) -><br> ?supported_ptypes:<a href="Netplex_types.html#TYPEparallelization_type">Netplex_types.parallelization_type</a> list -><br> name:string -><br> setup:(<a href="Rpc_server.html#TYPEt">Rpc_server.t</a> -> 'a -> unit) -> unit -> <a href="Netplex_types.processor_factory-c.html">Netplex_types.processor_factory</a></code></pre><div class="info ">
<div class="info-desc">
<p>A factory for TCP-based RPC servers. In <code class="code">name</code> the name of the processor
is defined. This name can be referenced from the config file like:</p>
<pre class="codepre"><code class="code"> processor {
type = "the passed [name]";
...
}
</code></pre>
<p>Parameters may be included in the <code class="code">processor</code> section:</p>
<ul>
<li><code class="code">portmapper</code>: This is a boolean parameter. If set to true,
the Internet port is registered with the portmapper program.
This will fail if there are several Internet bindings with distinct
port numbers!</li>
<li><code class="code">timeout</code>: This is a float parameter. It sets the transport
timeout of the RPC server (see <a href="Rpc_server.html#VALset_timeout"><code class="code">Rpc_server.set_timeout</code></a>).
If a connection hangs for this number of seconds, it is
shut down by the server.</li>
</ul>
<p>Further parameters and subsections can be defined by the user. These
parameters should be parsed and checked for correctness by the
<code class="code">configure</code> callback. The result of <code class="code">configure</code> is also passed
to <code class="code">setup</code> and other optional functions. The <code class="code">configure</code> function is
called just before the service is
added to Netplex (i.e. from the controller context).</p>
<p>The return value of <code class="code">configure</code> can be of any type. This value
exists once for every time the processor is instantiated (used) by a
service. It is not only useful for passing configuration values
down, but also for storing intermediate results while establishing
the service.</p>
<p>The <code class="code">Rpc_server.t</code> structure is created every time a new connection
is accepted. Of course, this is done from the context of the container.
The <code class="code">Rpc_server.t</code> is created without any binding; the user must
bind procedures in the <code class="code">setup</code> function. This can be done by calling
<code class="code">Rpc_server.bind</code> or the ocamlrpcgen-generated function (by the
<code class="code">-srv2</code> switch of ocamlrpcgen).</p>
<p>For example, a minimal factory for an RPC service may look like:</p>
<pre class="codepre"><code class="code"> let proc_ping () = () (* Trivial RPC procedure *)
let my_factory() =
Rpc_netplex.rpc_factory
~name:"my_rpc_service"
~factory:(fun _ _ -> ())
~setup:(fun rpc () ->
My_rpc_srv.bind ~proc_ping rpc
)
()
</code></pre>
<p>The <code class="code">setup</code> function is also called once before a new connection is
accepted to get a list of programs and procedures. The <code class="code">Rpc_server.t</code>
is a special one in this case, and one can test for it with the
<a href="Rpc_server.html#VALis_dummy"><code class="code">Rpc_server.is_dummy</code></a> function.</p>
</div>
</div>
<div class="param_info"><code class="code">socket_config</code> : An optional function computing the socket
configuration. By default, <code class="code">Rpc_server.default_socket_config</code> is used.
Special socket configuration would, for example, allow SSL.</div>
<div class="param_info"><code class="code">hooks</code> : An optional function returning the hooks to call.
See <code class="code">Netplex_types.processor_hooks</code> for documentation.</div>
<div class="param_info"><code class="code">supported_ptypes</code> : Which parallelization types are supported
by the service. By default, both multi-processing and multi-threading
are included in this list.</div>
<pre><span id="VALdebug_rpc_internals"><span class="keyword">val</span> debug_rpc_internals</span> : <code class="type">bool Stdlib.ref</code></pre>
<pre><span id="VALdebug_rpc_service"><span class="keyword">val</span> debug_rpc_service</span> : <code class="type">bool Stdlib.ref</code></pre><div class="info ">
<div class="info-desc">
<p>These variables control debugging of <code class="code">Rpc_server</code>. If set, the
debug messages are sent to the Netplex logger. These variables must
be set before an RPC connection is accepted.</p>
</div>
</div>
</body></html>
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