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<h1 id="jsr223-jython-scripting">JSR223 Jython Scripting</h1>
<h2 id="configuration">Configuration</h2>
<p><a href="http://www.jython.org/downloads.html">Download</a> the Jython 2.7.x installer package.
Install Jython on the local filesystem and make note of the installation directory location.</p>
<p>The Jython implementation will need to be added to openHABs Java classpath.
How this is done depends on the specific installation technique and operating system.</p>
<h3 id="linux-package-installers">Linux Package Installers</h3>
<p>Modify the <code class="highlighter-rouge">EXTRA_JAVA_OPTS</code> environment variable in <code class="highlighter-rouge">/etc/default/openhab2</code> to:</p>
<div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">EXTRA_JAVA_OPTS</span><span class="o">=</span><span class="nt">-Xbootclasspath</span>/a:/home/pi/jython2.7.0/jython.jar <span class="se">\</span>
<span class="nt">-Dpython</span>.home<span class="o">=</span>/home/pi/jython2.7.0 <span class="se">\</span>
<span class="nt">-Dpython</span>.path<span class="o">=</span>/etc/openhab2/lib/python
</code></pre></div></div>
<p>This will add the Jython library to the Java classpath,
set the Jython home directory and specify the initial Python path for the Jython runtime.
Python modules and packages can be installed into the <code class="highlighter-rouge">python.path</code> locations and imported from scripts.
Note that library modules and packages are not automatically reloaded when they change.</p>
<h3 id="mac-and-windows-or-manual-installation">Mac and Windows or Manual Installation</h3>
<p>Set the <code class="highlighter-rouge">EXTRA_JAVA_OPTS</code> environment variable to the value described in the Linux configuration.
Note that on Windows the environment variable value should be set as a single line
(without backslashes to combine the line fragments).</p>
<h2 id="configuration-testing">Configuration Testing</h2>
<p>In the <code class="highlighter-rouge">automation/jsr223</code> directory create an empty file called <code class="highlighter-rouge">test.py</code>.</p>
<p>Watch the openHAB log file carefully (<a href="/v2.2/administration/logging.html">Karaf logging</a>
or viewing the <code class="highlighter-rouge">openhab.log</code> file directly).
You should see a log line with information similar to:</p>
<div class="language-text highlighter-rouge"><div class="highlight"><pre class="highlight"><code> ... [INFO ] [s.i.GenericScriptEngineFactory:28 ] - Activated scripting support for ECMAScript
... [INFO ] [s.i.GenericScriptEngineFactory:28 ] - Activated scripting support for python
...
... [INFO ] [.a.m.s.r.i.l.ScriptFileWatcher:150 ] - Loading script 'test.py'
</code></pre></div></div>
<blockquote>
<p>NOTE: ECMAScript is Javascript</p>
</blockquote>
<p>Look for any potentially related error messages.</p>
<p>To enable debug logging, use the <a href="/v2.2/administration/logging.html">Karaf logging</a> commands to
enable debug logging for the automation functionality:</p>
<div class="language-text highlighter-rouge"><div class="highlight"><pre class="highlight"><code>log:set DEBUG org.eclipse.smarthome.automation
</code></pre></div></div>
<h2 id="script-examples">Script Examples</h2>
<p>Jython scripts provide access to almost all the functionality in an openHAB runtime environment.
As a simple example, the following script logs “Hello, World!” into the openhab.log file.
Note that <code class="highlighter-rouge">print</code> will usually not work since the output has no terminal to display the text.
One exception is when the openHAB server is running from the Eclipse IDE.
The openHAB server uses the <a href="https://www.slf4j.org/">SLFJ</a> library for logging.</p>
<div class="language-python highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kn">from</span> <span class="nn">org.slf4j</span> <span class="kn">import</span> <span class="n">LoggerFactory</span>
<span class="n">LoggerFactory</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="s">"org.eclipse.smarthome.automation.examples"</span><span class="p">)</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s">"Hello world!"</span><span class="p">)</span>
</code></pre></div></div>
<p>Jython can <a href="http://www.jython.org/jythonbook/en/1.0/ModulesPackages.html">import Java classes</a>.
Depending on the openHAB logging configuration,
you may need to prefix logger names with <code class="highlighter-rouge">org.eclipse.smarthome.automation</code>
for them to show up in the log file (or you modify the logging configuration).</p>
<blockquote>
<p>NOTE: Be careful with using wildcards when importing Java packages (e.g., <code class="highlighter-rouge">import org.sl4j.*</code>).
This will work in some cases, but it might not work in some situations.
Its best to use explicit imports with Java packages.
For more details, see the Jython documentation on
<a href="http://www.jython.org/jythonbook/en/1.0/ModulesPackages.html#java-package-scanning">Java package scanning</a>.</p>
</blockquote>
<p>The script then uses the <a href="https://www.slf4j.org/apidocs/org/slf4j/Logger.html">LoggerFactory</a>
to obtain a named logger and then logs a message like:</p>
<div class="language-text highlighter-rouge"><div class="highlight"><pre class="highlight"><code> ... [INFO ] [.smarthome.automation.examples:-2 ] - Hello world!
</code></pre></div></div>
<p>Notice that no rules were required for this simple script.
This can be a useful way to experiment with simple Jython code before defining rules or other more advanced functionality.</p>
<p>If you want to respond to openHAB events you can create rules in the scripts.
The following script requires two string items, <code class="highlighter-rouge">TestString1</code> and <code class="highlighter-rouge">TestString2</code>.
The rule created in the script is triggered by an update to <code class="highlighter-rouge">TestString1</code> and,
when triggered, the rule updates <code class="highlighter-rouge">TestString2</code>.</p>
<div class="language-python highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">scriptExtension</span><span class="o">.</span><span class="n">importPreset</span><span class="p">(</span><span class="s">"RuleSimple"</span><span class="p">)</span>
<span class="n">scriptExtension</span><span class="o">.</span><span class="n">importPreset</span><span class="p">(</span><span class="s">"RuleSupport"</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">MyRule</span><span class="p">(</span><span class="n">SimpleRule</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">triggers</span> <span class="o">=</span> <span class="p">[</span>
<span class="n">Trigger</span><span class="p">(</span><span class="s">"MyTrigger"</span><span class="p">,</span> <span class="s">"core.ItemStateUpdateTrigger"</span><span class="p">,</span>
<span class="n">Configuration</span><span class="p">({</span> <span class="s">"itemName"</span><span class="p">:</span> <span class="s">"TestString1"</span><span class="p">}))</span>
<span class="p">]</span>
<span class="k">def</span> <span class="nf">execute</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">module</span><span class="p">,</span> <span class="nb">input</span><span class="p">):</span>
<span class="n">events</span><span class="o">.</span><span class="n">postUpdate</span><span class="p">(</span><span class="s">"TestString2"</span><span class="p">,</span> <span class="s">"some data"</span><span class="p">)</span>
<span class="n">automationManager</span><span class="o">.</span><span class="n">addRule</span><span class="p">(</span><span class="n">MyRule</span><span class="p">())</span>
</code></pre></div></div>
<p>When a script is loaded, some names are already defined in the script <em>scope</em> (the local Jython namespace).
To define rules, you must include some additional <a href="jsr223.html#presets">script <em>extensions</em></a>
(implemented as “presets”) that add more names to the script scope for specific purposes.
In this case, the <code class="highlighter-rouge">RuleSimple</code> extension is used to import the <code class="highlighter-rouge">SimpleRule</code> base class.
The <code class="highlighter-rouge">RuleSupport</code> extensions provides the <code class="highlighter-rouge">automationManager</code> that allows you to register rule instances with openHAB.</p>
<p>The Jython rule class uses the <code class="highlighter-rouge">SimpleRule</code> subclass to simplify some aspects of the openHAB interface for use with JSR223.
n the constructor, the triggers atribute is set to a list of <a href="jsr223.html#trigger_types">triggers</a>.
In this example, the trigger is a state update trigger.
The trigger name identifies the trigger and the configuration direction provides trigger-specific options.
For the item update trigger, the configuration provides the item name of the monitored item.</p>
<p>The <code class="highlighter-rouge">execute</code> method is invoked when the rule is triggered.
The <code class="highlighter-rouge">module</code> and <code class="highlighter-rouge">input</code> arguments can be used in advanced rules.
The information provided varies by the trigger type.</p>
<h3 id="resources">Resources</h3>
<ul>
<li>
<p><a href="https://github.com/eclipse/smarthome/wiki/Scripted-Rule-Support">Scripted Rule Support</a></p>
<p>Early documentation on JSR223 usage in openHAB 2. Includes IDE setup instructions.</p>
</li>
<li>
<p><a href="https://github.com/steve-bate/openhab2-jython">openhab2-jython</a> (github)</p>
<p>Provides information and examples related to advanced, exploratory openHAB JSR223 Jython usage.</p>
<ul>
<li>Wrappers to simplify <code class="highlighter-rouge">Trigger</code> usage in rules.</li>
<li>Python decorators to define simple time-triggered and item-triggered functions</li>
<li>Python logging bridge to openHAB logger</li>
<li>Custom Trigger Implementations: <code class="highlighter-rouge">StartupTrigger</code>, <code class="highlighter-rouge">OsgiEventTrigger</code>, …</li>
<li>OSGI console command implemented in Jython</li>
<li>OH2 Module Implementations in Jython (things, item providers, …)</li>
<li>Jython-based ScriptExtension (preset) provider support.</li>
<li>Example of using Pykka Actor library.</li>
<li>Unit-testing support</li>
</ul>
</li>
</ul>
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