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Site updated at 2014-12-21 22:41:30 UTC

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Paulus Schoutsen 2014-12-21 14:41:30 -08:00
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<ul class="menu pull-right">
<li><a href="/getting-started/">Getting started</a></li>
<li><a href="/architecture/">Architecture</a></li>
<li><a href="/contributing/">Contributing</a></li>
<li><a href="/blog/2014/12/18/website-launched/">Blog</a></li>
<li><a href="/developers/">Developers</a></li>
<li><a href="/api/">API</a></li>
<li><a href="/blog/">Blog</a></li>
<li><a href="https://groups.google.com/forum/#!forum/home-assistant-dev">Need help?</a></li>
</ul>
</nav>
@ -74,23 +75,25 @@
<hr class="divider">
<p><img src='/images/ha_architecture.png' style='background-color: white'/></p>
<p><a href='/images/ha_architecture.png'>
<img src='/images/ha_architecture.png' style='border: 0; box-shadow: none;'/>
</a></p>
<p>The core of Home Assistant exists of the following parts.</p>
<p>The <b>Event Bus</b> facilitates the firing and listening of events. This is the beating heart of Home Assistant.</p>
<p>The <strong>Event Bus</strong> facilitates the firing and listening of events. This is the beating heart of Home Assistant.</p>
<p>The <b>State Machine</b> keeps track of the states of things. Fires a state_changed event when a state has been changed.</p>
<p>The <strong>State Machine</strong> keeps track of the states of things. Fires a state_changed event when a state has been changed.</p>
<p>The <b>Service Registry</b> listens on the event bus for call_service events and allows other code to register services.</p>
<p>The <strong>Service Registry</strong> listens on the event bus for call_service events and allows other code to register services.</p>
<p>The <b>Timer</b> will send every 10 seconds a time_changed event on the event bus.</p>
<p>The <strong>Timer</strong> will send every 10 seconds a time_changed event on the event bus.</p>
<p>Take for example the device_tracker component. This component is responsible for keeping track which devices are home. It checks which devices are home every time a time_changed event is fired on the event bus. It will then update the state machine with the information for each device.</p>
<p>This setup allows us to create simple yet powerful logic for controlling your home:</p>
<pre><code>In the event that the state of device 'Paulus Nexus 5' changes to the 'Home' state:
<pre><code>In the event that device 'Paulus Nexus 5' changes to the 'Home' state:
If the sun has set and the lights are not on:
Turn on the lights
@ -105,6 +108,43 @@ In the event of the sun setting:
<p>By using the Bus as a central communication hub between components it is easy to replace components or add functionality. If you would want to change the way devices are detected you only have to write a component that updates the device states in the State Machine.</p>
<h2>Multiple connected instances</h2>
<p>Home Assistant supports running multiple synchronzied instances using a master-slave model. Slaves forward all local events fired and states set to the master instance which will then replicate it to each slave.</p>
<p>Because each slave maintains its own ServiceRegistry it is possible to have multiple slaves respond to one service call.</p>
<p><a href='/images/architecture-remote.png'>
<img src='/images/architecture-remote.png' style='border: 0; box-shadow: none;' />
</a></p>
<p>A slave instance can be started with the following code and has the same support for components as a master-instance.</p>
<figure class='code'><figcaption><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
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</pre></td><td class='code'><pre><code class='python'><span class='line'><span class="kn">import</span> <span class="nn">homeassistant.remote</span> <span class="kn">as</span> <span class="nn">remote</span>
</span><span class='line'><span class="kn">import</span> <span class="nn">homeassistant.components.http</span> <span class="kn">as</span> <span class="nn">http</span>
</span><span class='line'>
</span><span class='line'><span class="n">remote_api</span> <span class="o">=</span> <span class="n">remote</span><span class="o">.</span><span class="n">API</span><span class="p">(</span><span class="s">&quot;remote_host_or_ip&quot;</span><span class="p">,</span> <span class="s">&quot;remote_api_password&quot;</span><span class="p">)</span>
</span><span class='line'>
</span><span class='line'><span class="n">hass</span> <span class="o">=</span> <span class="n">remote</span><span class="o">.</span><span class="n">HomeAssistant</span><span class="p">(</span><span class="n">remote_api</span><span class="p">)</span>
</span><span class='line'>
</span><span class='line'><span class="n">http</span><span class="o">.</span><span class="n">setup</span><span class="p">(</span><span class="n">hass</span><span class="p">,</span> <span class="s">&quot;my_local_api_password&quot;</span><span class="p">)</span>
</span><span class='line'>
</span><span class='line'><span class="n">hass</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
</span><span class='line'><span class="n">hass</span><span class="o">.</span><span class="n">block_till_stopped</span><span class="p">()</span>
</span></code></pre></td></tr></table></div></figure>
</article>
@ -133,8 +173,7 @@ In the event of the sun setting:
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