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<h1 id="lifecycle-management-lcm-rules">Lifecycle Management (LCM) Rules</h1>
<ul>
<li>NOTE: This is a prototype/experimental feature. So issues might raise during operation</li>
</ul>
<p>LCM Rules are used for defining complex conditions and actions during the lifecycle of a service. In Openslice there are four types of rules defined:</p>
<ul>
<li>PRE_PROVISION</li>
<li>CREATION</li>
<li>AFTER_ACTIVATION </li>
<li>SUPERVISION </li>
<li>AFTER_DEACTIVATION </li>
</ul>
<p>The following figure displays the different phases that the rules are performed, during the lifecycle of a Network Slice Instance.</p>
<p><a href="../images/lcm/lcmfig1.png"><img alt="Rules in NSI" src="../images/lcm/lcmfig1.png" /></a></p>
<ul>
<li>PRE_PROVISION rules: Run only once just before creating a service with a given priority. </li>
<li>CREATION rules: Run while the referenced service dependencies of a service are created</li>
<li>AFTER_ACTIVATION rules: Run only once just after a service get the ACTIVE state</li>
<li>SUPERVISION rules: Run when a characteristic of a service is changed and the service is in the ACTIVE state </li>
<li>AFTER_DEACTIVATION rules: Run only once just after a service get the INACTIVE/TERMINATED state </li>
</ul>
<p>In general the rules allow to perform many actions during service LCM. Thes are some examples:</p>
<ul>
<li>Modify service specification parameters before the instantiation of a service (or during operation) based on other dependencies. These parameters might be part of other services already included in Service order</li>
<li>Translate GST/NEST parameter values to other values passed later to NFVO for instantiation or control</li>
<li>Define complex OSM Configs based on other dependencies and passing variables</li>
<li>Define any dependencies when creating the referenced services</li>
<li>Dynamically include new service dependencies</li>
<li>Create new service orders so include dynamically other services</li>
<li>Call external (RESTful) services (via http(s), define payload, examine response)</li>
</ul>
<h2 id="examine-if-the-rules-are-executed-successfully">Examine if the rules are executed successfully</h2>
<p>Rules are transformed automatically to executable code (currently is Java). If a rule is performed successfully  or has any issues (e.g. unexpected syntax errors or exceptions) appear in OSOM logfiles and also tey are attached as Notes to the running Service.</p>
<h2 id="lcm-rules-and-osom-service-orchestration">LCM Rules and OSOM Service Orchestration</h2>
<p>OSOM is the responsible service for executing the rules on a specific phase. The following image explains the design in the BPMN phases:</p>
<p><a href="../images/lcm/lcmfig1_osom.png"><img alt="Rules" src="../images/lcm/lcmfig1_osom.png" /></a></p>
<h2 id="define-rules">Define rules</h2>
<p>Rules are defined when designing a Service Spec. Here is an example of a list of rules:</p>
<p><a href="../images/lcm/lcmfig2.png"><img alt="lcmrules" src="../images/lcm/lcmfig2.png" /></a></p>
<p>Execution order of rules on a specific phase is random</p>
<ul>
<li>NOTE: There is a priority field. The lower the number the highest the priority of rule execution. For example Rule with priority 0 will run before rule with priority 1.</li>
</ul>
<h3 id="definition-language">Definition language</h3>
<ul>
<li>The visual language that Openslice used is based on Google's Blockly (see https://developers.google.com/blockly)</li>
<li>The blockly graph is automatically translated to Java internally and then dynamically executed during orchestration phases.</li>
</ul>
<p>The following figure is an example of such a rule design. The rule for example will run in PRE_PROVISION phase:</p>
<p><a href="../images/lcm/lcmfig3.png"><img alt="lcmrules" src="../images/lcm/lcmfig3.png" /></a></p>
<ul>
<li>The goal of the above rule is to properly define a variable AreaCodes given the chosen AreaOfService from a Service Order.</li>
<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>
<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>
<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-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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