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<title>Layering</title>
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<h1 xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">Layering</h1>
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<h2 class="title" style="clear: both">
<a name="Layering2"></a>Layering</h2>
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<div class="section" title="Description">
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<h3 class="title">
<a name="Description5"></a>Description</h3>
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<p>In addition to the Actor containment hierarchies, Layering provides another method to hierarchically structure a software system. Layering and actor hierarchies with port to port connections can be mixed on every level of granularity.</p>
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<p>an ActorClass can define a Service Provision Point (SPP) to publish a specific service, defined by a ProtocolClass</p>
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<p>an ActorClass can define a Service Access Point (SAP) if it needs a service, defined by a ProtocolClass</p>
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<p>for a given Actor hierarchy, a LayerConnection defines which SAP will be satisfied by (connected to) which SPP</p>
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<a name="Notation5"></a>Notation</h3>
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					<span class="bold"><strong>Description</strong></span></td>
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					<span class="bold"><strong>Graphical Notation</strong></span></td>
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					<span class="bold"><strong>Textual Notation</strong></span></td>
						
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<td>The Layer Connections in this model define which services are provided by the 
					<span class="emphasis"><em>ServiceLayer</em></span>  (
					<span class="emphasis"><em>digitalIO</em></span> and 
					<span class="emphasis"><em>timer</em></span>)</td>
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<img src="images/040-LayeringModel.png"></div>
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<td>The implementation of the services (SPPs) can be delegated to sub actors. In this case the actor 
					<span class="emphasis"><em>ServiceLayer</em></span> relays (delegates) the implementation services 
					<span class="emphasis"><em>digitalIO</em></span> and 
					<span class="emphasis"><em>timer</em></span> to sub actors</td>
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<img src="images/040-LayeringServiceLayer.png"></div>
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<img src="images/040-LayeringServiceLayerTextual.png"></div>
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<td>Every Actor inside the 
					<span class="emphasis"><em>ApplicationLayer</em></span> that contains an SAP with the same Protocol as 
					<span class="emphasis"><em>timer</em></span> or 
					<span class="emphasis"><em>digitalIO</em></span> will be connected to the specified SPP</td>
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<img src="images/040-LayeringApplicationLayer.png"></div>
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<img src="images/040-LayeringApplicationLayerTextual.png"></div>
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