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| <h1 class="post-title" itemprop="name headline">Introducing Feature Definition</h1> |
| <p class="post-meta">Published by <img src="https://www.gravatar.com/avatar/63474b61e2a3d5e3316c825d6dc2294a?s=135" alt="A photo of Jürgen Fickel" style="width:50px;border-radius:50%;display:inline-block;margin-right:5px;" /><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name"><a href="https://github.com/jufickel-b" target="_blank">Jürgen Fickel</a> </span></span> on <time datetime="2018-02-08T00:00:00-05:00" itemprop="datePublished">Feb 8, 2018</time> - Tags: |
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| <p>Brace yourselves, <a href="https://eclipse.org/vorto">Eclipse Vorto</a> is going to be integrated with Ditto.</p> |
| |
| <h2 id="rationale">Rationale</h2> |
| <p>By now you most probably represented your devices as <em>things</em> with <em>features</em>. |
| This is indeed the proper way to do it. |
| This approach is flexible and easy so far.</p> |
| |
| <p>But wouldn’t it be nice to have the possibility of providing an explicit schema for the digital twins of your devices?</p> |
| |
| <p>This is where Eclipse Vorto enters the game. |
| Vorto enables you to define <em>information models</em> and <em>function blocks</em> which would be mapped to <em>things</em> and <em>features</em> |
| in Ditto.</p> |
| |
| <p>To make a feature aware of a schema we have extended feature by a <em>definition</em>. |
| A feature definition is a means of describing the type of a feature, thus enabling the validation the integrity of |
| a feature’s properties.</p> |
| |
| <figure><img class="docimage" src="images/pages/basic/ditto-thing-feature-definition-model.png" alt="Feature Definition Model" style="max-width: 250px" /><figcaption>One Thing can have many features. A feature may conform to a *definition*</figcaption></figure> |
| |
| <p>Technically, a definition is an array of identifier strings each of which having the form |
| <code class="highlighter-rouge"><namespace>:<name>:<version></code>.</p> |
| |
| <p>A fully-fledged JSON representation of a feature with a definition is shown below:</p> |
| |
| <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w"> |
| </span><span class="s2">"lamp"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"definition"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="w"> </span><span class="s2">"com.mycompany.fb:Lamp:1.0.0"</span><span class="w"> </span><span class="p">],</span><span class="w"> |
| </span><span class="s2">"properties"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"configuration"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"on"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"location"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"longitude"</span><span class="p">:</span><span class="w"> </span><span class="mf">34.052235</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"latitude"</span><span class="p">:</span><span class="w"> </span><span class="mf">-118.243683</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">},</span><span class="w"> |
| </span><span class="s2">"status"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"on"</span><span class="p">:</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"color"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"red"</span><span class="p">:</span><span class="w"> </span><span class="mi">128</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"green"</span><span class="p">:</span><span class="w"> </span><span class="mi">255</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"blue"</span><span class="p">:</span><span class="w"> </span><span class="mi">0</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
| |
| <p>For diving deeper into feature definitions, please have a look at <a href="basic-feature.html#feature-definition">Basic concept - Feature Definition</a>.</p> |
| |
| <h2 id="validation">Validation</h2> |
| <div class="alert alert-danger" role="alert"><i class="fa fa-exclamation-circle"></i> <b>Warning:</b> Yet Ditto does not use definition to validate features by itself.</div> |
| |
| <p>However, nothing can stop you from enforcing types by yourself:</p> |
| |
| <ol> |
| <li>Use the <a href="http://vorto.eclipse.org/#/generators">Ditto generator</a> to generate JSON schema files from your Vorto |
| model(s).</li> |
| <li>Identify the schema files to be used by the Feature definition identifiers.</li> |
| <li>Validate the JSON representation of your feature using the JSON schema before sending it over the wire.</li> |
| </ol> |
| |
| <h2 id="example">Example</h2> |
| <p>Please find more information and an example at <a href="basic-feature.html#feature-definition">Basic concept - Feature Definition</a>.</p> |
| |
| <p><br /> |
| <br /></p> |
| <figure><img class="docimage" src="images/ditto.svg" alt="Ditto" style="max-width: 500px" /></figure> |
| |
| <p>–<br /> |
| The Eclipse Ditto team</p> |
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