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<p>So in the system there are already predefined recipes, which in each process-step of the workflow some piece of code is executed. </p>

<p>How is it possible to intervene in the workflow process and inject some user defined actions? The next image illustrates the idea</p>

<p><a href="../lcm/img02.png"><img alt="lcm" src="../lcm/img02.png" /></a></p>

<p>## How is it possible to intervene in the workflow process and affect it?</p>

<h2 id="how-is-it-possible-to-intervene-in-the-workflow-process-and-affect-it">How is it possible to intervene in the workflow process and affect it?</h2>

<p>LCM Rules are used for defining complex conditions and actions during the lifecycle of a service. In Openslice there are the following types of rules defined:</p>

<ul>

<li>PRE_PROVISION</li>

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    Typical Examples

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      Define variables according to cases

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      Define variables according to cases

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  <a href="#define-rules-to-create-a-resource-for-a-kubernetes-operator" class="md-nav__link">

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      Define Rules to create a resource for a Kubernetes Operator

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      Define complex OSM configs for DAY 0

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      Define and instantiate different services according to Service Order request

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  <h1>Typical Examples</h1>





<h1 id="examples-of-rules">Examples of Rules</h1>

<p>The following images provide some examples of rules.</p>

<h3 id="define-variables-according-to-cases">Define variables according to cases</h3>

<p>In the following example we :</p>

<ul>

<li>define a String variable. </li>

<li>Then according to the Area of Service selected from the Service Order of the Service Specification we need to define it properly.</li>

<li>We output the value to the OSOM Log</li>

<li>Define dynamically the value of another parameter (This is fictional) and then do some other condition check</li>

</ul>

<p>The strAreaCodes could be passed then e.g. to NFVO for instantiation of services to these cells.</p>

<p><a href="../images/lcm/lcmfig9.png"><img alt="lcmrules" src="../images/lcm/lcmfig9.png" /></a></p>

<h3 id="define-rules-to-create-a-resource-for-a-kubernetes-operator">Define Rules to create a resource for a Kubernetes Operator</h3>

<ul>

<li>Modify the _CR_SPEC characteristic</li>

<li>Add an "Input with variables block"</li>

<li>Add a multiline Text block</li>

<li>Mark with %s, %d, etc the parameters to modify with some action</li>

<li>Add a list with the variables and their values</li>

</ul>

<p>in the example we modify a YAML spec with parama, paramb, action values from the characteristics spec.parama, spec.paramb, spec.action</p>

<p><a href="../images/lcm/lcmfig15.png"><img alt="lcmrules" src="../images/lcm/lcmfig15.png" /></a></p>

<h3 id="define-complex-osm-configs-for-day-0">Define complex OSM configs for DAY 0</h3>

<p>The following displays some complex examples for defining the parameters to pass to the NFV. In this case is OSM.</p>

<ul>

<li>

<p>NOTE: The OSM_CONFIG characteristic of a service is the one that it is used in orchestration to instantiate NS from OSM</p>

</li>

<li>

<p>check the variable strTargetsParam. It is passed to the variable strOsmConfig3 which is executed if the Number of Cameras is more than 100. </p>

</li>

<li>if the Video quality requested is 3, then the Maximum Namber of camers will be 8. Check the OSM detailed configuration block and its syntax.</li>

<li>if the Video quality requested is 2, we use a simpler OSM Config block to configure the parameter OSM_CONFIG. We just injected a json text ( watch the Escape of the string for the Quotes!)</li>

<li>if the Video quality requested is 1, again we use a simpler OSM Config block to configure the parameter OSM_CONFIG. We use as injected json text a variable constructed later</li>

</ul>

<p><a href="../images/lcm/lcmfig10.png"><img alt="lcmrules" src="../images/lcm/lcmfig10.png" /></a></p>

<h3 id="define-and-instantiate-different-services-according-to-service-order-request">Define and instantiate different services according to Service Order request</h3>

<p>In the following example we would like to offer a service either as Platinum, Gold or Silver. Depending on the selection we need to instantiate different services.</p>

<p>There are different ways to accomplish this:</p>

<ul>

<li>create dynamically New Service Orders of RFSs with equivalent quality of Services</li>

<li>change for example the VIMs that you deploy the NS</li>

<li>change the NSD (that is use different VNFs)</li>

</ul>

<p>The following image displays for example the latter case.</p>

<p><a href="../images/lcm/lcmfig11.png"><img alt="lcmrules" src="../images/lcm/lcmfig11.png" /></a></p>

<h3 id="call-an-external-restful-service">Call an external RESTful service</h3>

<p>This is useful in cases for example of alarms , external logging, calling other services e.g. email or even a complex algorithm written in other language e.g. call an external service and get a result. (service e.g. a Python service)</p>

<p><a href="../images/lcm/lcmfig12.png"><img alt="lcmrules" src="../images/lcm/lcmfig12.png" /></a></p>

<p><a href="../images/lcm/lcmfig13.png"><img alt="lcmrules" src="../images/lcm/lcmfig13.png" /></a></p>

<h3 id="create-new-service-orders">Create New Service Orders</h3>

<p>The following example calls to Order a New Service Specification with specific Parameter Values</p>

<p><a href="../images/lcm/lcmfig14.png"><img alt="lcmrules" src="../images/lcm/lcmfig14.png" /></a></p>

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<li>On the right side the user can define some rule properties or observe the underlying generated java code.</li>

</ul>

<h2 id="the-blocks-library">The blocks library</h2>

<p>The following images describe some blocks found in the library.</p>

<p>Blockly has syntax rules. It helps with colours to define them. </p>

<p>So for example a parameter that is a Number cannot be "glued" with a String. Will need some conversion first</p>

<p><a href="../images/lcm/lcmfig4.png"><img alt="lcmrules" src="../images/lcm/lcmfig4.png" /></a>

<a href="../images/lcm/lcmfig5.png"><img alt="lcmrules" src="../images/lcm/lcmfig5.png" /></a>

<a href="../images/lcm/lcmfig6.png"><img alt="lcmrules" src="../images/lcm/lcmfig6.png" /></a>

<a href="../images/lcm/lcmfig7.png"><img alt="lcmrules" src="../images/lcm/lcmfig7.png" /></a>

<a href="../images/lcm/lcmfig8.png"><img alt="lcmrules" src="../images/lcm/lcmfig8.png" /></a></p>

<p>See our <a href="../specification/">LCM Blocks specification</a></p>

<h2 id="examples-of-rules">Examples of Rules</h2>

<p>The following images provide some examples of rules.</p>

<h3 id="define-variables-according-to-cases">define variables according to cases</h3>