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<h1>Delay Models</h1>
<div class="article-style">
<p>MOSAIC has different types of delays implemented for different use cases. This page will
give a short introduction into the types and their usages, as well as example configurations,
which are used throughout MOSAIC. The implementations can be
found in the package <code>org.eclipse.mosaic.lib.model.delay</code>.
Note prior to the release of MOSAIC delay values were configured using Milliseconds as unit,
this has been refactored to Nanoseconds. Alternatively you can specify delay values using
a String with a unit (eg <code>&quot;delay&quot;: &quot;20 ms&quot;</code>).</p>
<h2 id="delay-models">Delay Models</h2>
<p>The <code>Delay</code> class represents an implementation for a specific delay model. The following model implementation exist:</p>
<h3 id="constantdelay">ConstantDelay</h3>
<p>The <code>ConstantDelay</code>-class is arguably the simplest implementation of <code>Delay</code>. This model is configured with a single
field <code>delay</code>, which the <code>generateDelay(...)</code>-method will simply return.<br>
While this delay doesn&rsquo;t provide realistic behaviour in most cases it is optimal for testing purposes as it
can easily be retraced.</p>
<p><strong>Configuration:</strong></p>
<pre><code class="language-json">&quot;delay&quot;: {
&quot;type&quot;: &quot;ConstantDelay&quot;,
&quot;delay&quot;: &quot;20 ms&quot;
}
</code></pre>
<h3 id="simplerandomdelay">SimpleRandomDelay</h3>
<p>The <code>SimpleRandomDelay</code> model allows for the generated delays to be randomly distributed between a <code>minDelay</code> and a <code>maxDelay</code>.
Additionally, the <code>steps</code> field is used to limit the amount of different delays, by equally separating the interval into
the amount of steps specified. This delay provides a simple and performant way to randomize and thereby more realistically reflect real-world delays.</p>
<p>For example, with the configuration below, one of the following delays is randomly chosen: <code>[0.4, 0.9, 1.4, 1.9, 2.4] ms</code>.</p>
<p><strong>Configuration:</strong></p>
<pre><code class="language-json">&quot;delay&quot;: {
&quot;type&quot;: &quot;SimpleRandomDelay&quot;,
&quot;steps&quot;: 5,
&quot;minDelay&quot;: &quot;0.4 ms&quot;,
&quot;maxDelay&quot;: &quot;2.4 ms&quot;
}
</code></pre>
<h3 id="gamma-delays">Gamma Delays</h3>
<p>MOSAIC provides two types of delays using a Gamma-distribution to sample values, namely <code>GammaRandomDelay</code> and <code>GammaSpeedDelay</code>.
The parameters for the used Gamma-distribution have been determined experimentally. The <code>GammaSpeedDelay</code> extends the <code>GammaRandomDelay</code>
by a speed penalty. Both delay-types aim to provide more realistic solution, than the previous models, but come with the downside of complexity.</p>
<p><strong>Configurations:</strong></p>
<pre><code class="language-json">&quot;delay&quot;: {
&quot;type&quot;: &quot;GammaRandomDelay&quot;,
&quot;minDelay&quot;: &quot;10 ms&quot;,
&quot;expDelay&quot;: &quot;30 ms&quot;
}
</code></pre>
<pre><code class="language-json">&quot;delay&quot;: {
&quot;type&quot;: &quot;GammaSpeedDelay&quot;,
&quot;minDelay&quot;: &quot;10 ms&quot;,
&quot;expDelay&quot;: &quot;30 ms&quot;
}
</code></pre>
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