Define a dependency

Prerequisite: You must be familiar with the Syntax used in Tutorials and have already created an extension.

In this tutorial, we will see how you can define a new dependency relationship between iTop classes

Let's assume you have created a new class “Truc” under FunctionalCI, and that class is impacting an ApplicationSolution or a BusinessProcess. In addition you want that impact to depends on a rule which is diiferent for each Application Solution and BusinessProcess, so for one particular Business Process, maybe juste one Truc must be up, while for another, 75% of the Trucs must be up.

itop_design / classes

<class id="Truc" _delta="define">
  <parent>FunctionalCI</parent>
  <properties>...</properties>
  <fields>
    <field id="functionalci_id"xsi:type="AttributeExternalKey">
      <sql>functionalci_id</sql>
      <filter><![CDATA[
        SELECT FunctionalCI WHERE finalclass IN ('ApplicationSolution', 'BusinessProcess')
      ]]></filter>
      <target_class>FunctionalCI</target_class>
      <is_null_allowed>true</is_null_allowed>
      <on_target_delete>DEL_MANUAL</on_target_delete>
      <tracking_level>all</tracking_level>
      <allow_target_creation>true </allow_target_creation>
    </field>
  </fields>
  <relations>
    <relation id="impacts"><-! This id has to be called "impacts" to be used in impacts analyses -->
      <neighbours>
        <neighbour id="business"><-! Any name is fine -->
          <-! Specifying an ExternalKey is the simplest way to specify a dependency -->
          <-! It can also be a LinkedSet or a pair of queries (downward and upward) -->
          <attribute>functionalci_id</attribute>
        </neighbour>
      </neighbours>
    </relation>
  </relations>
</class>
</class id="FunctionalCI" _delta="merge">
      <fields>
        <field id="trucs_list" xsi:type="AttributeLinkedSet" _delta="define">
          <linked_class>Truc</linked_class>
          <ext_key_to_me>functionalci_id</ext_key_to_me>
          <count_min>0</count_min>
          <count_max>0</count_max>
          <edit_mode>add_remove</edit_mode>
          <duplicates/>
        </field>
        <field id="redundancy" xsi:type="AttributeRedundancySettings" _delta="define">
          <sql>redundancy</sql>
          <relation_code>impacts</relation_code>
          <from_class>Truc</from_class>
          <neighbour_id>business</neighbour_id>
          <enabled>true</enabled>
          <enabled_mode>user</enabled_mode>
          <min_up>1</min_up>
          <min_up_mode>user</min_up_mode>
          <min_up_type>count</min_up_type>
        </field>
      </fields>
</class id="BusinessProcess" _delta="merge">
      <presentation>
        <details>
          <items>
            <item id="trucs_list" _delta="define">
              <rank>110</rank>
            </item>
          </items>
        </details>
      </presentation>
</class>
</class id="ApplicationSolution" _delta="merge">
      <presentation>
        <details>
          <items>
            <item id="trucs_list" _delta="define">
              <rank>110</rank>
            </item>
          </items>
        </details>
      </presentation>
</class>