a3ed46f2c3
git-svn-id: svn://10.65.10.50/branches/R_10_00@23289 c028cbd2-c16b-5b4b-a496-9718f37d4682
667 lines
16 KiB
HTML
667 lines
16 KiB
HTML
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</head>
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<body class="manpage">
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<div id="header">
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<h1>
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zmq_proxy(3) Manual Page
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</h1>
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<h2>NAME</h2>
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<div class="sectionbody">
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<p>zmq_proxy -
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start built-in 0MQ proxy
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</p>
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</div>
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</div>
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<div id="content">
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<div class="sect1">
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<h2 id="_synopsis">SYNOPSIS</h2>
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<div class="sectionbody">
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<div class="paragraph"><p><strong>int zmq_proxy (const void <em>*frontend</em>, const void <em>*backend</em>, const void <em>*capture</em>);</strong></p></div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_description">DESCRIPTION</h2>
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<div class="sectionbody">
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<div class="paragraph"><p>The <em>zmq_proxy()</em> function starts the built-in ØMQ proxy in the current
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application thread.</p></div>
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<div class="paragraph"><p>The proxy connects a frontend socket to a backend socket. Conceptually, data
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flows from frontend to backend. Depending on the socket types, replies may flow
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in the opposite direction. The direction is conceptual only; the proxy is fully
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symmetric and there is no technical difference between frontend and backend.</p></div>
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<div class="paragraph"><p>Before calling <em>zmq_proxy()</em> you must set any socket options, and connect or
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bind both frontend and backend sockets. The two conventional proxy models are:</p></div>
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<div class="paragraph"><p><em>zmq_proxy()</em> runs in the current thread and returns only if/when the current
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context is closed.</p></div>
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<div class="paragraph"><p>If the capture socket is not NULL, the proxy shall send all messages, received
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on both frontend and backend, to the capture socket. The capture socket should
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be a <em>ZMQ_PUB</em>, <em>ZMQ_DEALER</em>, <em>ZMQ_PUSH</em>, or <em>ZMQ_PAIR</em> socket.</p></div>
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<div class="paragraph"><p>Refer to <a href="zmq_socket.html">zmq_socket(3)</a> for a description of the available socket types.</p></div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_example_usage">EXAMPLE USAGE</h2>
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<div class="sectionbody">
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<div class="sect2">
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<h3 id="_shared_queue">Shared Queue</h3>
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<div class="paragraph"><p>When the frontend is a ZMQ_ROUTER socket, and the backend is a ZMQ_DEALER
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socket, the proxy shall act as a shared queue that collects requests from a
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set of clients, and distributes these fairly among a set of services.
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Requests shall be fair-queued from frontend connections and distributed evenly
|
|
across backend connections. Replies shall automatically return to the client
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|
that made the original request.</p></div>
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</div>
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<div class="sect2">
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|
<h3 id="_forwarder">Forwarder</h3>
|
|
<div class="paragraph"><p>When the frontend is a ZMQ_XSUB socket, and the backend is a ZMQ_XPUB socket,
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|
the proxy shall act as a message forwarder that collects messages from a set
|
|
of publishers and forwards these to a set of subscribers. This may be used to
|
|
bridge networks transports, e.g. read on tcp:// and forward on pgm://.</p></div>
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</div>
|
|
<div class="sect2">
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|
<h3 id="_streamer">Streamer</h3>
|
|
<div class="paragraph"><p>When the frontend is a ZMQ_PULL socket, and the backend is a ZMQ_PUSH socket,
|
|
the proxy shall collect tasks from a set of clients and forwards these to a set
|
|
of workers using the pipeline pattern.</p></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_return_value">RETURN VALUE</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The <em>zmq_proxy()</em> function always returns <tt>-1</tt> and <em>errno</em> set to <strong>ETERM</strong> (the
|
|
ØMQ <em>context</em> associated with either of the specified sockets was terminated).</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_example">EXAMPLE</h2>
|
|
<div class="sectionbody">
|
|
<div class="listingblock">
|
|
<div class="title">Creating a shared queue proxy</div>
|
|
<div class="content">
|
|
<pre><tt>// Create frontend and backend sockets
|
|
void *frontend = zmq_socket (context, ZMQ_ROUTER);
|
|
assert (backend);
|
|
void *backend = zmq_socket (context, ZMQ_DEALER);
|
|
assert (frontend);
|
|
// Bind both sockets to TCP ports
|
|
assert (zmq_bind (frontend, "tcp://*:5555") == 0);
|
|
assert (zmq_bind (backend, "tcp://*:5556") == 0);
|
|
// Start the queue proxy, which runs until ETERM
|
|
zmq_proxy (frontend, backend, NULL);</tt></pre>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_see_also">SEE ALSO</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p><a href="zmq_bind.html">zmq_bind(3)</a>
|
|
<a href="zmq_connect.html">zmq_connect(3)</a>
|
|
<a href="zmq_socket.html">zmq_socket(3)</a>
|
|
<a href="zmq.html">zmq(7)</a></p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_authors">AUTHORS</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>This page was written by the ØMQ community. To make a change please
|
|
read the ØMQ Contribution Policy at <a href="http://www.zeromq.org/docs:contributing">http://www.zeromq.org/docs:contributing</a>.</p></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footnotes"><hr /></div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
ØMQ 4.0.4<br />
|
|
Last updated 2013-11-13 12:57:50 EST
|
|
</div>
|
|
</div>
|
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</body>
|
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</html>
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