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<div class="section" id="module-state_machine">
<span id="welcome-to-state-machine-s-documentation"></span><h1>Welcome to state_machine’s documentation!<a class="headerlink" href="#module-state_machine" title="Permalink to this headline">¶</a></h1>
<div class="section" id="state-machine-state-machine">
<h2>state_machine (State Machine)<a class="headerlink" href="#state-machine-state-machine" title="Permalink to this headline">¶</a></h2>
<p><strong>Author:</strong></p>
<ul class="simple">
<li>Dirk Alders <<a class="reference external" href="mailto:sudo-dirk%40mount-mockery.de">sudo-dirk<span>@</span>mount-mockery<span>.</span>de</a>></li>
</ul>
<p><strong>Description:</strong></p>
<blockquote>
<div>This Module helps implementing state machines.</div></blockquote>
<p><strong>Submodules:</strong></p>
<ul class="simple">
<li><a class="reference internal" href="#state_machine.state_machine" title="state_machine.state_machine"><code class="xref py py-class docutils literal notranslate"><span class="pre">state_machine.state_machine</span></code></a></li>
</ul>
<p><strong>Unittest:</strong></p>
<blockquote>
<div>See also the <a class="reference download internal" download="" href="_downloads/e2fbca9180ad234c517493570f525e69/unittest.pdf"><code class="xref download docutils literal notranslate"><span class="pre">unittest</span></code></a> documentation.</div></blockquote>
<p><strong>Module Documentation:</strong></p>
<dl class="class">
<dt id="state_machine.state_machine">
<em class="property">class </em><code class="descclassname">state_machine.</code><code class="descname">state_machine</code><span class="sig-paren">(</span><em>default_state</em>, <em>log_lvl</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine" title="Permalink to this definition">¶</a></dt>
<dd><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>default_state</strong> – The default state which is set on initialisation.</li>
<li><strong>log_lvl</strong> – The log level, this Module logs to (see Loging-Levels of Module <code class="xref py py-mod docutils literal notranslate"><span class="pre">logging</span></code>)</li>
</ul>
</td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Additional keyword parameters well be stored as varibles of the instance (e.g. to give variables or methods for transition condition calculation).</p>
</div>
<p>A state machine class can be created by deriving it from this class. The transitions are defined by overriding the variable <cite>TRANSITIONS</cite>.
This Variable is a dictionary, where the key is the start-state and the content is a tuple or list of transitions. Each transition is a tuple or list
including the following information: (condition-method (str), transition-time (number), target_state (str)).</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The condition-method needs to be implemented as part of the new class.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">It is usefull to define the states as variables of this class.</p>
</div>
<p><strong>Example:</strong></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="ch">#!/usr/bin/env python</span>
<span class="c1"># -*- coding: UTF-8 -*-</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s1">'../..'</span><span class="p">)</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">report</span>
<span class="kn">import</span> <span class="nn">state_machine</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s1">'root'</span><span class="p">)</span>
<span class="n">report</span><span class="o">.</span><span class="n">stdoutLoggingConfigure</span><span class="p">(</span><span class="n">log_name_lvl</span><span class="o">=</span><span class="p">[(</span><span class="s1">'root'</span><span class="p">,</span> <span class="s1">'DEBUG'</span><span class="p">),</span> <span class="p">])</span>
<span class="k">class</span> <span class="nc">trafic_lights</span><span class="p">(</span><span class="n">state_machine</span><span class="o">.</span><span class="n">state_machine</span><span class="p">):</span>
<span class="n">LOG_PREFIX</span> <span class="o">=</span> <span class="s1">'TraficLights:'</span>
<span class="n">STATE_RED</span> <span class="o">=</span> <span class="s1">'state_red'</span>
<span class="n">STATE_GREEN</span> <span class="o">=</span> <span class="s1">'state_green'</span>
<span class="n">CONDITION_TRUE</span> <span class="o">=</span> <span class="s1">'condition_true'</span>
<span class="n">CONDITION_PEDASTRIAN_REQUEST</span> <span class="o">=</span> <span class="s1">'condition_pedastrian_request'</span>
<span class="n">TRANSITIONS</span> <span class="o">=</span> <span class="p">{</span>
<span class="n">STATE_RED</span><span class="p">:</span> <span class="p">(</span>
<span class="p">(</span><span class="n">CONDITION_PEDASTRIAN_REQUEST</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">STATE_GREEN</span><span class="p">),</span>
<span class="p">),</span>
<span class="n">STATE_GREEN</span><span class="p">:</span> <span class="p">(</span>
<span class="p">(</span><span class="n">CONDITION_TRUE</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="n">STATE_RED</span><span class="p">),</span>
<span class="p">)</span>
<span class="p">}</span>
<span class="k">def</span> <span class="nf">condition_true</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">set_padestrian_request</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">logger</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">__log_lvl__</span><span class="p">,</span> <span class="s1">'</span><span class="si">%s</span><span class="s1"> Pedestrian gave state change request.'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">LOG_PREFIX</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pedastrian_request</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">condition_pedastrian_request</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">pedastrian_request</span>
<span class="n">sm</span> <span class="o">=</span> <span class="n">trafic_lights</span><span class="p">(</span><span class="n">trafic_lights</span><span class="o">.</span><span class="n">STATE_RED</span><span class="p">,</span> <span class="n">logging</span><span class="o">.</span><span class="n">INFO</span><span class="p">,</span> <span class="n">pedastrian_request</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">sm</span><span class="o">.</span><span class="n">register_state_change_callback</span><span class="p">(</span><span class="n">sm</span><span class="o">.</span><span class="n">STATE_GREEN</span><span class="p">,</span> <span class="n">sm</span><span class="o">.</span><span class="n">CONDITION_PEDASTRIAN_REQUEST</span><span class="p">,</span> <span class="n">logger</span><span class="o">.</span><span class="n">info</span><span class="p">,</span> <span class="s1">'Callback information: Traffic light had been changed to green caused by pedastrian request'</span><span class="p">)</span>
<span class="k">while</span> <span class="ow">not</span> <span class="n">sm</span><span class="o">.</span><span class="n">previous_state_was</span><span class="p">(</span><span class="n">sm</span><span class="o">.</span><span class="n">STATE_GREEN</span><span class="p">):</span>
<span class="k">if</span> <span class="n">sm</span><span class="o">.</span><span class="n">this_state_is</span><span class="p">(</span><span class="n">sm</span><span class="o">.</span><span class="n">STATE_RED</span><span class="p">)</span> <span class="ow">and</span> <span class="n">sm</span><span class="o">.</span><span class="n">this_state_duration</span><span class="p">()</span> <span class="o">></span> <span class="mf">0.2</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">sm</span><span class="o">.</span><span class="n">condition_pedastrian_request</span><span class="p">():</span>
<span class="n">sm</span><span class="o">.</span><span class="n">set_padestrian_request</span><span class="p">()</span>
<span class="n">sm</span><span class="o">.</span><span class="n">work</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">07</span> <span class="mi">01</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">29</span><span class="p">,</span><span class="mi">619</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">state_machine</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">TraficLights</span><span class="p">:</span> <span class="n">State</span> <span class="n">change</span> <span class="p">(</span><span class="s1">'__init__'</span><span class="p">):</span> <span class="kc">None</span> <span class="o">-></span> <span class="s1">'state_red'</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">07</span> <span class="mi">01</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">29</span><span class="p">,</span><span class="mi">819</span><span class="p">:</span> <span class="n">root</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">TraficLights</span><span class="p">:</span> <span class="n">Pedestrian</span> <span class="n">gave</span> <span class="n">state</span> <span class="n">change</span> <span class="n">request</span><span class="o">.</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">07</span> <span class="mi">01</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">819</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">state_machine</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">TraficLights</span><span class="p">:</span> <span class="n">State</span> <span class="n">change</span> <span class="p">(</span><span class="s1">'condition_pedastrian_request'</span><span class="p">):</span> <span class="s1">'state_red'</span> <span class="o">-></span> <span class="s1">'state_green'</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">07</span> <span class="mi">01</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">819</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">state_machine</span> <span class="o">-</span> <span class="n">DEBUG</span> <span class="o">-</span> <span class="n">Executing</span> <span class="n">callback</span> <span class="mi">0</span> <span class="o">-</span> <span class="n">logging</span><span class="o">.</span><span class="n">info</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">07</span> <span class="mi">01</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">30</span><span class="p">,</span><span class="mi">819</span><span class="p">:</span> <span class="n">root</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">Callback</span> <span class="n">information</span><span class="p">:</span> <span class="n">Traffic</span> <span class="n">light</span> <span class="n">had</span> <span class="n">been</span> <span class="n">changed</span> <span class="n">to</span> <span class="n">green</span> <span class="n">caused</span> <span class="n">by</span> <span class="n">pedastrian</span> <span class="n">request</span>
<span class="mi">2021</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">07</span> <span class="mi">01</span><span class="p">:</span><span class="mi">36</span><span class="p">:</span><span class="mi">33</span><span class="p">,</span><span class="mi">819</span><span class="p">:</span> <span class="n">root</span><span class="o">.</span><span class="n">state_machine</span> <span class="o">-</span> <span class="n">INFO</span> <span class="o">-</span> <span class="n">TraficLights</span><span class="p">:</span> <span class="n">State</span> <span class="n">change</span> <span class="p">(</span><span class="s1">'condition_true'</span><span class="p">):</span> <span class="s1">'state_green'</span> <span class="o">-></span> <span class="s1">'state_red'</span>
</pre></div>
</div>
<dl class="method">
<dt id="state_machine.state_machine.last_transition_condition">
<code class="descname">last_transition_condition</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.last_transition_condition" title="Permalink to this definition">¶</a></dt>
<dd><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">Returns:</th><td class="field-body">The last transition condition.</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">str</td>
</tr>
</tbody>
</table>
<p>This method returns the last transition condition.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.last_transition_condition_was">
<code class="descname">last_transition_condition_was</code><span class="sig-paren">(</span><em>condition</em><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.last_transition_condition_was" title="Permalink to this definition">¶</a></dt>
<dd><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>condition</strong> (<em>str</em>) – The condition to be checked</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">True if the given condition was the last transition condition, else False.</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
<p>This methods returns the boolean information if the last transition condition is equivalent to the given condition.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.previous_state">
<code class="descname">previous_state</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.previous_state" title="Permalink to this definition">¶</a></dt>
<dd><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">Returns:</th><td class="field-body">The previous state.</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">str</td>
</tr>
</tbody>
</table>
<p>This method returns the previous state of the state machine.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.previous_state_duration">
<code class="descname">previous_state_duration</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.previous_state_duration" title="Permalink to this definition">¶</a></dt>
<dd><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">Returns:</th><td class="field-body">The time how long the previous state was active.</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float</td>
</tr>
</tbody>
</table>
<p>This method returns the time how long the previous state was active.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.previous_state_was">
<code class="descname">previous_state_was</code><span class="sig-paren">(</span><em>state</em><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.previous_state_was" title="Permalink to this definition">¶</a></dt>
<dd><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>state</strong> (<em>str</em>) – The state to be checked</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">True if the given state was previously active, else False.</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
<p>This methods returns the boolean information if the state machine was previously in the given state.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.register_state_change_callback">
<code class="descname">register_state_change_callback</code><span class="sig-paren">(</span><em>state</em>, <em>condition</em>, <em>callback</em>, <em>*args</em>, <em>**kwargs</em><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.register_state_change_callback" title="Permalink to this definition">¶</a></dt>
<dd><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>state</strong> (<em>str</em>) – The target state. The callback will be executed, if the state machine changes to this state. None means all states.</li>
<li><strong>condition</strong> (<em>str</em>) – The transition condition. The callback will be executed, if this condition is responsible for the state change. None means all conditions.</li>
<li><strong>callback</strong> – The callback to be executed.</li>
</ul>
</td>
</tr>
</tbody>
</table>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Additional arguments and keyword parameters are supported. These arguments and parameters will be used as arguments and parameters for the callback execution.</p>
</div>
<p>This methods allows to register callbacks which will be executed on state changes.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.this_state">
<code class="descname">this_state</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.this_state" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
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<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">The current state.</td>
</tr>
</tbody>
</table>
<p>This method returns the current state of the state machine.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.this_state_duration">
<code class="descname">this_state_duration</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.this_state_duration" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
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<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">The time how long the current state is active.</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">float</td>
</tr>
</tbody>
</table>
<p>This method returns the time how long the current state is active.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.this_state_is">
<code class="descname">this_state_is</code><span class="sig-paren">(</span><em>state</em><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.this_state_is" title="Permalink to this definition">¶</a></dt>
<dd><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>state</strong> (<em>str</em>) – The state to be checked</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">True if the given state is currently active, else False.</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
<p>This methods returns the boolean information if the state machine is currently in the given state.</p>
</dd></dl>
<dl class="method">
<dt id="state_machine.state_machine.work">
<code class="descname">work</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#state_machine.state_machine.work" title="Permalink to this definition">¶</a></dt>
<dd><p>This Method needs to be executed cyclicly to enable the state machine.</p>
</dd></dl>
</dd></dl>
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<div class="section" id="indices-and-tables">
<h1>Indices and tables<a class="headerlink" href="#indices-and-tables" title="Permalink to this headline">¶</a></h1>
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