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| <!-- Content Column --> |
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| <div class="post-header"> |
| <h1 class="post-title-main">Feature</h1> |
| </div> |
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| <h2 id="feature">Feature</h2> |
| |
| <p>A Feature is used to manage all data and functionality of a Thing that can be clustered in an outlined technical |
| context.</p> |
| |
| <p>For different contexts or aspects of a Thing different Features can be used which are all belonging to the same Thing |
| and do not exist without this Thing.</p> |
| |
| <h3 id="feature-id">Feature ID</h3> |
| <p>Within a Thing each Feature is identified by a unique string - the so called Feature ID. |
| A Feature ID often needs to be set in the path of a HTTP request. Due to this fact we strongly recommend to use a |
| restricted set of characters (e.g. those for |
| <a href="https://www.ietf.org/rfc/rfc3986.txt">Uniform Resource Identifiers (URI)</a>).</p> |
| |
| <h3 id="feature-properties">Feature properties</h3> |
| |
| <p>The <strong>data</strong> related to Features is managed in form of a <strong>list of properties</strong>. These properties can be categorized, |
| e.g. to manage the status, the configuration or any fault information. |
| Feature properties are represented as one JSON object.</p> |
| |
| <p>Each property itself can be either a simple/scalar value or a complex object; allowed is any JSON value.</p> |
| |
| <h3 id="feature-definition">Feature definition</h3> |
| |
| <p>Ditto supports specifying a definition for a feature in order to document how a feature’s state is structured |
| (in <a href="#feature-properties">properties</a>), and which behavior/capabilities |
| (<a href="basic-messages.html">messages related to features</a>) can be expected from such a feature.<br /></p> |
| |
| <p>A feature’s definition is a list of definition identifiers containing a <em>namespace</em>, <em>name</em> and <em>version</em> separated |
| by colons: <code class="highlighter-rouge">namespace:name:version</code>. Thus the <em>definition</em> element can hold even multiple identifiers.</p> |
| |
| <p>A Definition can be seen as some kind of type for features. The <a href="#feature-properties">properties</a> of a |
| feature containing a definition identifier <code class="highlighter-rouge">"org.eclipse.ditto:lamp:1.0.0"</code> can be expected to follow the structure |
| described in the <code class="highlighter-rouge">lamp</code> type of namespace <code class="highlighter-rouge">org.eclipse.ditto</code> semantically versioned with version <code class="highlighter-rouge">1.0.0</code>.</p> |
| |
| <div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> Ditto does not contain a type system on its own and does not specify how to describe types. |
| Tooling for editing such structures and type descriptors is provided by <a href="#the-link-to-eclipse-vorto">Eclipse Vorto</a>.</div> |
| |
| <p>Ditto aims to support contract-based development - by using feature definitions - to ensure validity and |
| integrity of <strong>digital twins</strong>.</p> |
| |
| <div class="alert alert-danger" role="alert"><i class="fa fa-exclamation-circle"></i> <b>Warning:</b> Currently Ditto <strong>does not</strong> ensure that the properties of a feature or its supported |
| messages follow the type defined in the definition.</div> |
| |
| <h2 id="example">Example</h2> |
| |
| <p>The following snippet shows a Feature with the ID “arbitrary-feature” and a definition with the sole identifier |
| “org.eclipse.ditto:complex-type:1.0.0”:</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">"arbitrary-feature"</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">"org.eclipse.ditto:complex-type: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">"status"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"connected"</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">"complexProperty"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"> |
| </span><span class="s2">"street"</span><span class="p">:</span><span class="w"> </span><span class="s2">"my street"</span><span class="p">,</span><span class="w"> |
| </span><span class="s2">"house no"</span><span class="p">:</span><span class="w"> </span><span class="mi">42</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> |
| |
| <h2 id="model-specification">Model specification</h2> |
| |
| <p>The feature model is the same for API version 1 and 2:</p> |
| |
| <script src="docson/widget.js" data-schema="../jsonschema/feature.json"></script> |
| |
| <h2 id="the-link-to-eclipse-vorto">The link to Eclipse Vorto</h2> |
| |
| <blockquote> |
| <p>Vorto is an open source tool that allows to create and manage technology agnostic, abstract device descriptions, so |
| called information models. Information models describe the attributes and the capabilities of real world devices. |
| Source: <a href="http://www.eclipse.org/vorto/">http://www.eclipse.org/vorto/</a></p> |
| </blockquote> |
| |
| <p>Ditto’s feature definition may be mapped to the Vorto type system which is defined by so called “information models” and |
| “function blocks”:</p> |
| <blockquote> |
| <p>Information models represent the capabilities of a particular type of device entirely. |
| An information model contains one or more function blocks.</p> |
| </blockquote> |
| |
| <blockquote> |
| <p>A function block provides an abstract view on a device to applications that want to employ the devices’ functionality. |
| Thus, it is a consistent, self-contained set of (potentially re-usable) properties and capabilities.</p> |
| </blockquote> |
| |
| <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> |
| |
| <h3 id="mapping-vorto-function-block-elements">Mapping Vorto function block elements</h3> |
| |
| <p>A Vorto function block consists of different sections defining state and capabilities |
| (see also <a href="https://www.eclipse.org/vorto/">Eclipse Vorto’s documentation</a>) of a device |
| (in our case of a feature):</p> |
| <ul> |
| <li><code class="highlighter-rouge">configuration</code>: Contains one or many configuration properties for the function block.</li> |
| <li><code class="highlighter-rouge">status</code>: Contains one or many status properties for the function block.</li> |
| <li><code class="highlighter-rouge">fault</code>: Contains one or many fault properties for the function block.</li> |
| <li><code class="highlighter-rouge">operations</code>: Contains one or many operations for the function block.</li> |
| <li><code class="highlighter-rouge">events</code>: Contains one or many events for the function block.</li> |
| </ul> |
| |
| <h4 id="function-block-state">Function block state</h4> |
| |
| <p>The <code class="highlighter-rouge">configuration</code>, <code class="highlighter-rouge">status</code> and <code class="highlighter-rouge">fault</code> sections of a function block define the state of a feature in Ditto.</p> |
| |
| <p>They are mapped to a corresponding JSON object inside the feature <a href="#feature-properties">properties</a> which gets us |
| following JSON structure of a Ditto feature:</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">"feature-id"</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">"namespace:name:version"</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="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="p">},</span><span class="w"> |
| </span><span class="s2">"fault"</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><span class="p">}</span><span class="w"> |
| </span></code></pre></div></div> |
| |
| <p>The structure below <code class="highlighter-rouge">configuration, status, fault</code> is defined by the custom types of the Vorto function block. As these |
| can be simple types as well as complex types, the JSON structure follows the structure of the types.</p> |
| |
| <h4 id="function-block-capabilities">Function block capabilities</h4> |
| |
| <p>The <code class="highlighter-rouge">operations</code> and <code class="highlighter-rouge">events</code> sections of a function block define the capabilities or behavior of a Ditto feature.</p> |
| |
| <p>Both are mapped to feature <a href="basic-messages.html">messages</a> sent “to” or “from” a feature.</p> |
| <ul> |
| <li>A message sent <strong>to</strong> a feature is mapped to an <code class="highlighter-rouge">operation</code>.</li> |
| <li>A messages sent <strong>from</strong> a feature is mapped to an <code class="highlighter-rouge">event</code>.</li> |
| </ul> |
| |
| <h3 id="vorto-example">Vorto example</h3> |
| |
| <div class="alert alert-danger" role="alert"><i class="fa fa-exclamation-circle"></i> <b>Warning:</b> Ditto has not yet included Eclipse Vorto in order to enforce types - the following |
| section can be seen as an <strong>outlook</strong> how Ditto would map Vorto concepts to features.</div> |
| |
| <p>Here an example for a Vorto Function Block (in Vorto’s custom DSL) with the name <code class="highlighter-rouge">Lamp</code>. |
| For the sake of giving an example for events this lamp has some additional capabilities like detecting movement and |
| smoke .</p> |
| |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code> namespace com.mycompany.fb |
| version 1.0.0 |
| displayname "Lamp" |
| category demo |
| using com.mycompany.fb.Lamp ; 1.0.0 |
| using com.mycompany.fb.Color ; 1.2.0 |
| functionblock Lamp { |
| configuration { |
| mandatory on as boolean "this defines whether the lamp should be on or off" |
| location as Location "the location of the lamp" |
| } |
| |
| status { |
| mandatory on as boolean "the reported on/off state" |
| color as Color "the reported color of the lamp" |
| } |
| |
| events { |
| smokeDetected { |
| intensity as float <MIN 0.0, MAX 10.0> "the intensity of the detected smoke" |
| mandatory critical as boolean "whether it is critical or not" |
| } |
| |
| movementAlarm {} |
| } |
| |
| operations{ |
| blink(interval as int, duration as int) returns boolean "lets the Lamp blink in the interval for duration" |
| stopBlinking() returns boolean "stops blinking lets the Lamp" |
| changeColor(newColor as Color) "changes the color of the Lamp" |
| } |
| } |
| </code></pre></div></div> |
| |
| <p>The Vorto function block contains all information required for a feature’s definition identifier in Ditto:</p> |
| <ul> |
| <li>namespace: <code class="highlighter-rouge">com.mycompany.fb</code></li> |
| <li>name: <code class="highlighter-rouge">Lamp</code></li> |
| <li>version: <code class="highlighter-rouge">1.0.0</code></li> |
| </ul> |
| |
| <p>A feature containing a definition pointing to such a Vorto function block would look like this:</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>The capabilities or behavior of this “lamp” feature would be defined as <a href="basic-messages.html">messages</a>:</p> |
| <ul> |
| <li>Message with subject <code class="highlighter-rouge">smokeDetected</code> which is sent <code class="highlighter-rouge">FROM</code> a feature containing a JSON payload with an |
| <code class="highlighter-rouge">intensity</code> and whether the detected smoke has reached a <code class="highlighter-rouge">critical</code> mass or not.</li> |
| <li>Message with subject <code class="highlighter-rouge">movementAlarm</code> which is sent <code class="highlighter-rouge">FROM</code> a feature with no payload.</li> |
| <li>Message with subject <code class="highlighter-rouge">blink</code> which is sent <code class="highlighter-rouge">TO</code> a feature containing a JSON payload of an <code class="highlighter-rouge">interval</code> |
| (as JSON number) and a duration (also as JSON number) returning a JSON boolean.</li> |
| <li>Message with subject <code class="highlighter-rouge">stopBlinking</code> which is sent <code class="highlighter-rouge">TO</code> a feature with no payload returning a JSON boolean.</li> |
| <li>Message with subject <code class="highlighter-rouge">changeColor</code> which is sent <code class="highlighter-rouge">TO</code> a feature containing a JSON payload which follows the type |
| <code class="highlighter-rouge">Color</code> defined in another Vorto function block.</li> |
| </ul> |
| |
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