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Lightweight Execution Engine for DMN (Decision Model and Notation) written in Java.
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The Decision Engine can be used seamlessly in combination with BPMN and CMMN or standalone.
Add the following Maven Coordinates to your project:
<dependency>
<groupId>org.camunda.bpm.dmn</groupId>
<artifactId>camunda-engine-dmn</artifactId>
<version>${version.camunda}</version>
</dependency>Now you can use the DMN engine inside your Java Code:
public class DmnApp {
public static void main(String[] args) {
// configure and build the DMN engine
DmnEngine dmnEngine = DmnEngineConfiguration.createDefaultDmnEngineConfiguration().buildEngine();
// parse a decision
DmnDecision decision = dmnEngine.parseDecision("orderDecision", "CheckOrder.dmn");
Map<String, Object> data = new HashMap<String, Object>();
data.put("status", "gold");
data.put("sum", 354.12d);
// evaluate a decision
DmnDecisionTableResult result = dmnEngine.evaluateDecisionTable(decision, data);
}
}Add the following Maven Coordinates to your project:
<dependency>
<groupId>org.camunda.bpm</groupId>
<artifactId>camunda-engine</artifactId>
<version>${version.camunda}</versions>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.3.168</version>
<scope>test</scope>
</dependency>Next, reference a DMN decision from a BPMN Business Rule Task:
<bpmn:businessRuleTask id="assignApprover"
camunda:decisionRef="invoice-assign-approver"
camunda:resultVariable="approverGroups"
name="Assign Approver Group(s)">
</bpmn:businessRuleTask>The camunda:decisionRef attribute references the id of the decision in the DMN file:
<dmn:decision id="invoice-assign-approver" name="Assign Approver">
...
</dmn:decision>Now you can start the BPMN process inside your application:
public class App {
public static void main(String[] args) {
ProcessEngine processEngine = ProcessEngineConfiguration.createStandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
try {
processEngine.getRepositoryService()
.createDeployment()
.name("invoice deployment")
.addClasspathResource("invoice.bpmn")
.addClasspathResource("assign-approver-groups.dmn")
.deploy();
processEngine.getRuntimeService()
.startProcessInstanceByKey("invoice", createVariables()
.putValue("invoceNumber", "2323"));
}
finally {
processEngine.close();
}
}
}
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