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<span class="target" id="module-eventmq.utils.classes"></span><div class="section" id="classes-utility-classes">
<h1><code class="xref py py-mod docutils literal"><span class="pre">classes</span></code> – Utility Classes<a class="headerlink" href="#classes-utility-classes" title="Permalink to this headline">¶</a></h1>
<p>Defines some classes to use when implementing ZMQ devices</p>
<dl class="class">
<dt id="eventmq.utils.classes.EMQPService">
<em class="property">class </em><code class="descclassname">eventmq.utils.classes.</code><code class="descname">EMQPService</code><a class="headerlink" href="#eventmq.utils.classes.EMQPService" title="Permalink to this definition">¶</a></dt>
<dd><p>Helper for devices that connect to brokers.</p>
<p>Implements utility methods for sending EMQP messages for the following
EMQP commands.</p>
<blockquote>
<div><ul class="simple">
<li>INFORM</li>
</ul>
</div></blockquote>
<p>Also implements utlitiy methods for managing long-running processes.</p>
<dl class="docutils">
<dt>To use you must define:</dt>
<dd><ul class="first last simple">
<li><cite>self.outgoing</cite> - socket where messages can be sent to the Router</li>
<li><cite>self.SERVICE_TYPE</cite> - defines the service type for INFORM. See
<a class="reference internal" href="#eventmq.utils.classes.EMQPService.send_inform" title="eventmq.utils.classes.EMQPService.send_inform"><code class="xref py py-meth docutils literal"><span class="pre">send_inform()</span></code></a> for more information.</li>
<li><cite>self.poller</cite> - the poller that <cite>self.outgoing</cite> will be using.
Usually: <cite>self.poller = eventmq.poller.Poller()</cite></li>
</ul>
</dd>
</dl>
<p>When messages are received from the router, they are processed in
<a class="reference internal" href="#eventmq.utils.classes.EMQPService.process_message" title="eventmq.utils.classes.EMQPService.process_message"><code class="xref py py-meth docutils literal"><span class="pre">process_message()</span></code></a> which then calls <cite>on_COMMAND</cite>. This should be used
in the event loop so if you want to respond to the SCHEDULE command, you
would define the method <cite>on_schedule</cite> in your service class.</p>
<p>See the code for <code class="xref py py-class docutils literal"><span class="pre">Scheduler</span></code> and <code class="xref py py-class docutils literal"><span class="pre">JobManager</span></code> for examples.</p>
<dl class="attribute">
<dt id="eventmq.utils.classes.EMQPService.__weakref__">
<code class="descname">__weakref__</code><a class="headerlink" href="#eventmq.utils.classes.EMQPService.__weakref__" title="Permalink to this definition">¶</a></dt>
<dd><p>list of weak references to the object (if defined)</p>
</dd></dl>
<dl class="attribute">
<dt id="eventmq.utils.classes.EMQPService.is_heartbeat_enabled">
<code class="descname">is_heartbeat_enabled</code><a class="headerlink" href="#eventmq.utils.classes.EMQPService.is_heartbeat_enabled" title="Permalink to this definition">¶</a></dt>
<dd><p>Property to check if heartbeating is enabled. Useful when certain
properties must be updated for heartbeating
:returns: bool - True if heartbeating is enabled, False if it isn’t</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.EMQPService.on_ack">
<code class="descname">on_ack</code><span class="sig-paren">(</span><em>msgid</em>, <em>ackd_msgid</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.EMQPService.on_ack" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets <code class="xref py py-attr docutils literal"><span class="pre">awaiting_ack</span></code> to False</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.EMQPService.process_message">
<code class="descname">process_message</code><span class="sig-paren">(</span><em>msg</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.EMQPService.process_message" title="Permalink to this definition">¶</a></dt>
<dd><p>Processes a message. Processing takes form of calling an
<cite>on_EMQP_COMMAND</cite> method. The method must accept <cite>msgid</cite> and <cite>message</cite>
as the first arguments.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>msg</strong> – The message received from the socket to parse and process.</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.EMQPService.reset">
<code class="descname">reset</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.EMQPService.reset" title="Permalink to this definition">¶</a></dt>
<dd><p>Resets the current connection by closing and reopening the socket</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.EMQPService.send_inform">
<code class="descname">send_inform</code><span class="sig-paren">(</span><em>queue=None</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.EMQPService.send_inform" title="Permalink to this definition">¶</a></dt>
<dd><p>Queues an INFORM command to <cite>self.outgoing</cite>.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>type</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#str" title="(in Python v2.7)"><em>str</em></a>) – Either ‘worker’ or ‘scheduler’</li>
<li><strong>queue</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#list" title="(in Python v2.7)"><em>list</em></a>) – <ul>
<li>For ‘worker’ type, the queues the worker is listening on</li>
<li>Ignored for ‘scheduler’ type</li>
</ul>
</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><p class="first last"><code class="xref py py-exc docutils literal"><span class="pre">ValueError</span></code> – When <cite>type_</cite> does not match a specified type</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.EMQPService.start">
<code class="descname">start</code><span class="sig-paren">(</span><em>addr</em>, <em>queues='default'</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.EMQPService.start" title="Permalink to this definition">¶</a></dt>
<dd><p>Connect to <cite>addr</cite> and begin listening for job requests</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>addr</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#str" title="(in Python v2.7)"><em>str</em></a>) – connection string to connect to</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="eventmq.utils.classes.HeartbeatMixin">
<em class="property">class </em><code class="descclassname">eventmq.utils.classes.</code><code class="descname">HeartbeatMixin</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.HeartbeatMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>Provides methods for implementing heartbeats</p>
<dl class="method">
<dt id="eventmq.utils.classes.HeartbeatMixin.__init__">
<code class="descname">__init__</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.HeartbeatMixin.__init__" title="Permalink to this definition">¶</a></dt>
<dd><p>Sets up some variables to track the state of heartbeaty things</p>
</dd></dl>
<dl class="attribute">
<dt id="eventmq.utils.classes.HeartbeatMixin.__weakref__">
<code class="descname">__weakref__</code><a class="headerlink" href="#eventmq.utils.classes.HeartbeatMixin.__weakref__" title="Permalink to this definition">¶</a></dt>
<dd><p>list of weak references to the object (if defined)</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.HeartbeatMixin.is_dead">
<code class="descname">is_dead</code><span class="sig-paren">(</span><em>now=None</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.HeartbeatMixin.is_dead" title="Permalink to this definition">¶</a></dt>
<dd><p>Checks the heartbeat counters to find out if the thresholds have been
met.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>now</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#float" title="(in Python v2.7)"><em>float</em></a>) – The time to use to check if death has occurred. If
this value is None, then <code class="xref py py-func docutils literal"><span class="pre">utils.timeutils.monotonic()</span></code>
is used.</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">True if the connection to the peer has died, otherwise
False</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference external" href="https://docs.python.org/library/functions.html#bool" title="(in Python v2.7)">bool</a></td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.HeartbeatMixin.reset_heartbeat_counters">
<code class="descname">reset_heartbeat_counters</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.HeartbeatMixin.reset_heartbeat_counters" title="Permalink to this definition">¶</a></dt>
<dd><p>Resets all the counters for heartbeats back to 0</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.HeartbeatMixin.send_heartbeat">
<code class="descname">send_heartbeat</code><span class="sig-paren">(</span><em>socket</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.HeartbeatMixin.send_heartbeat" title="Permalink to this definition">¶</a></dt>
<dd><p>Send a HEARTBEAT command to the specified socket</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>socket</strong> (<a class="reference external" href="https://docs.python.org/library/socket.html#module-socket" title="(in Python v2.7)"><em>socket</em></a>) – The eMQP socket to send the message to</td>
</tr>
</tbody>
</table>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="eventmq.utils.classes.ZMQReceiveMixin">
<em class="property">class </em><code class="descclassname">eventmq.utils.classes.</code><code class="descname">ZMQReceiveMixin</code><a class="headerlink" href="#eventmq.utils.classes.ZMQReceiveMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>Defines some methods for receiving messages. This class will not work if
used on it’s own</p>
<dl class="attribute">
<dt id="eventmq.utils.classes.ZMQReceiveMixin.__weakref__">
<code class="descname">__weakref__</code><a class="headerlink" href="#eventmq.utils.classes.ZMQReceiveMixin.__weakref__" title="Permalink to this definition">¶</a></dt>
<dd><p>list of weak references to the object (if defined)</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.ZMQReceiveMixin.recv">
<code class="descname">recv</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.ZMQReceiveMixin.recv" title="Permalink to this definition">¶</a></dt>
<dd><p>Receive a message</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.ZMQReceiveMixin.recv_multipart">
<code class="descname">recv_multipart</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.ZMQReceiveMixin.recv_multipart" title="Permalink to this definition">¶</a></dt>
<dd><p>Receive a multipart message</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="eventmq.utils.classes.ZMQSendMixin">
<em class="property">class </em><code class="descclassname">eventmq.utils.classes.</code><code class="descname">ZMQSendMixin</code><a class="headerlink" href="#eventmq.utils.classes.ZMQSendMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>Defines some methods for sending messages. This class will not work if used
on it’s own</p>
<dl class="attribute">
<dt id="eventmq.utils.classes.ZMQSendMixin.__weakref__">
<code class="descname">__weakref__</code><a class="headerlink" href="#eventmq.utils.classes.ZMQSendMixin.__weakref__" title="Permalink to this definition">¶</a></dt>
<dd><p>list of weak references to the object (if defined)</p>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.ZMQSendMixin.send">
<code class="descname">send</code><span class="sig-paren">(</span><em>message</em>, <em>protocol_version</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.ZMQSendMixin.send" title="Permalink to this definition">¶</a></dt>
<dd><p>Sends a message</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>message</strong> – message to send to something</li>
<li><strong>protocol_version</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#str" title="(in Python v2.7)"><em>str</em></a>) – protocol version. it’s good practice, but
you may explicitly specify None to skip adding the version</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<dl class="method">
<dt id="eventmq.utils.classes.ZMQSendMixin.send_multipart">
<code class="descname">send_multipart</code><span class="sig-paren">(</span><em>message</em>, <em>protocol_version</em>, <em>_recipient_id=None</em><span class="sig-paren">)</span><a class="headerlink" href="#eventmq.utils.classes.ZMQSendMixin.send_multipart" title="Permalink to this definition">¶</a></dt>
<dd><p>Send a message directly to the 0mq socket. Automatically inserts some
frames for your convience. The sent frame ends up looking something
like this</p>
<blockquote>
<div>(_recipient_id, ‘’, protocol_version) + (your, tuple)</div></blockquote>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>message</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#tuple" title="(in Python v2.7)"><em>tuple</em></a>) – Raw message to send.</li>
<li><strong>protocol_version</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#str" title="(in Python v2.7)"><em>str</em></a>) – protocol version. it’s good practice but
you may explicitly specify None to skip adding the version</li>
<li><strong>_recipient_id</strong> (<a class="reference external" href="https://docs.python.org/library/functions.html#object" title="(in Python v2.7)"><em>object</em></a>) – When using a <code class="xref py py-attr docutils literal"><span class="pre">zmq.ROUTER</span></code> you must
specify the the recipient id of the remote socket</li>
</ul>
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