title	Process Variables Name Convention Checker
parent	Available Checkers

Process Variables Name Convention Checker

Elements in business processes are regularly subject to naming conventions. This checker validates the names of process variables with a configurable regular expression.

Variable name against internal convention
Variable name against external convention

Assumptions

The BPMN-models have to be in the classpath

Configuration

The rule should be configured as follows:

<rule>
    <name>ProcessVariablesNameConventionChecker</name>
    <state>true</state>
    <elementConventions>
      <elementConvention>
        <name>internal</name>
        <!-- field types for process variables -->
        <elementFieldTypes excluded="true">
          <elementFieldType>Class</elementFieldType>
          <elementFieldType>ExternalScript</elementFieldType>
          <elementFieldType>DMN</elementFieldType>
          <elementFieldType>DelegateExpression</elementFieldType>
        </elementFieldTypes>
        <description>Variable has to start with "int_"</description>
        <pattern>int_[a-zA-Z]+</pattern>
      </elementConvention>
      <elementConvention>
        <name>external</name>
        <!-- field types for process variables -->
        <elementFieldTypes>
          <elementFieldType>Class</elementFieldType>
          <elementFieldType>ExternalScript</elementFieldType>
          <elementFieldType>DMN</elementFieldType>
          <elementFieldType>DelegateExpression</elementFieldType>
        </elementFieldTypes>
        <description>Variable has to start with "ext_"</description>
        <pattern>ext_[a-zA-Z]+</pattern>
      </elementConvention>
    </elementConventions>
  </rule>

Via <state>true/false</state> the check can be enabled or disabled

For internal and external naming conventions, elementConventions must be defined.
An element convention consists of:

a name
an elementFieldType to be analyzed
a regular expression for the naming convention (pattern)
a description to describe the convention (optional)

The attribute excluded = "true" means that all element field types, except those that are stored, should be checked.

ElementFieldType can take the following values:
Class, FormField, Expression, DelegateExpression, ResultVariable, CalledElement, CaseRef, CollectionElement, ElementVariable, LoopCardinality, CompletionCondition, InlineScript, ExternalScript, Assignee, CandidateUsers, CandidateGroups, DueDate, FollowUpDate, DMN, CamundaIn and CamundaOut.

Error messages

process variable is against the naming convention '%conventionName%' (compare %Chapter%, %ElementFieldType%)

The message indicates that a process variable violates a specific naming convention.
%ConventionName% contains the name of the convention that has been defined within the rule.
%Chapter% and %ElementFieldType% contain information on where the process variable can be found in the Camunda Modeler for the specific BPMN element.

Solution: the variable has to be adapted to the convention.