Camunda BPMN

??? warning “Experimental module”

**Experimental** module is fully working and tested, but does not guarantee a fully stabilized API and may undergo some minor changes before being fully ready.
undergo some minor changes before being fully operational.

Module for connecting a BPMN process workflow engine based on Camunda 7

Dependency

Java Kotlin

Dependency build.gradle:

implementation "ru.tinkoff.kora.experimental:camunda-engine-bpmn"

Module:

@KoraApp
public interface Application extends CamundaEngineBpmnModule { }

Dependency build.gradle.kts:

implementation("ru.tinkoff.kora.experimental:camunda-engine-bpmn")

Module:

@KoraApp
interface Application : CamundaEngineBpmnModule

Requires JDBC module connection.

Configuration

Example of the complete configuration described in the CamundaEngineBpmnConfig class (example values or default values are specified):

Hocon YAML

camunda {
    engine {
        bpmn {
            jobExecutor {
                corePoolSize = 5 //(1)!
                maxPoolSize = 25 //(2)!
                queueSize = 25 //(3)!
                maxJobsPerAcquisition = 2 //(4)!
            }
            deployment {
                tenantId = "Camunda" //(5)!
                name = "KoraEngineAutoDeployment" //(6)!
                deployChangedOnly = true //(7)!
                resources = "classpath:bpm" //(8)!
                delay = "1m" //(9)!
            }
            parallelInitialization {
                enabled = true //(10)!
                validateIncompleteStatements = true //(11)!
            }
            admin {
                id = "admin" //(12)!
                password = "admin" //(13)!
                firstname = "Ivan" //(14)!
                lastname = "Ivanov" //(15)!
                email = "admin@mail.ru" //(16)!
            }
            telemetry {
                logging {
                    enabled = false //(17)!
                    stacktrace = true //(18)!
                }
                metrics {
                    enabled = true //(19)!
                    slo = [ 1, 10, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 30000, 60000, 90000 ] //(20)!
                }
                engineTelemetryEnabled = false //(21)!
                tracing {
                    enabled = true //(22)!
                }
            }
        }
    }
}

1. Minimum number of live threads in JobExecutor
2. Maximum number of threads in JobExecutor
3. Size of the task queue before tasks are thrown out of the JobExecutor execution queue
4. Maximum number of tasks in the JobExecutor execution (default is the number of CPU cores multiplied by 2)
5. Indeterminator tenant load resources (default is none)
6. Name of load resources
7. Flag that says that only modified resources should be loaded
8. Paths to find BPMN/FORM/DMN resources that will be loaded into the engine after startup
9. Delay before deploying new resources to engine
10. Whether to enable parallel loading, which slightly improves the engine startup speed
11. Whether to check for incomplete engine configuration requests
12. Camunda administrator identifier (optional)
13. Camunda Administrator Password (optional)
14. Camunda Administrator Name (optional)
15. Last name of Camunda administrator (optional)
16. Email of the Camunda administrator (optional)
17. Enables module logging (default is false)
18. Enables error stack logging (default is true)
19. Enables module metrics (default true)
20. Configures SLO for DistributionSummary metrics
21. Enables collection of engine metrics/telemetry (default is false)
22. Enables module tracing (default true)

camunda:
  engine:
    bpmn:
      jobExecutor:
        corePoolSize: 5 #(1)!
        maxPoolSize: 25 #(2)!
        queueSize: 25 #(3)!
        maxJobsPerAcquisition: 2 #(4)!
      deployment:
        tenantId: "Camunda" #(5)!
        name: "KoraEngineAutoDeployment" #(6)!
        deployChangedOnly: true #(7)!
        resources: "classpath:bpm" #(8)!
        delay: "1m" #(9)!
      parallelInitialization:
        enabled: true #(10)!
        validateIncompleteStatements: true #(11)!
      admin:
        id: "admin" #(12)!
        password: "admin" #(13)!
        firstname: "Ivan" #(14)!
        lastname: "Ivanov" #(15)!
        email: "admin@mail.ru" #(16)!
      telemetry:
        logging:
          enabled: false #(17)!
          stacktrace: true #(18)!
        metrics:
          enabled: true #(19)!
          slo: [ 0, 10, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 30000, 60000, 90000 ] #(20)!
        engineTelemetryEnabled: false #(21)!
        tracing:
          enabled: true #(22)!

1. Minimum number of live threads in JobExecutor
2. Maximum number of threads in JobExecutor
3. Size of the task queue before tasks are thrown out of the JobExecutor execution queue
4. Maximum number of tasks in the JobExecutor execution (default is the number of CPU cores multiplied by 2)
5. Indeterminator tenant load resources (default is none)
6. Name of load resources
7. Flag that says that only modified resources should be loaded
8. Paths to find BPMN/FORM/DMN resources that will be loaded into the engine after startup
9. Delay before deploying new resources to engine
10. Whether to enable parallel loading, which slightly improves the engine startup speed
11. Whether to check for incomplete engine configuration requests
12. Camunda administrator identifier (optional)
13. Camunda Administrator Password (optional)
14. Camunda Administrator Name (optional)
15. Last name of Camunda administrator (optional)
16. Email of the Camunda administrator (optional)
17. Enables module logging (default is false)
18. Enables error stack logging (default is true)
19. Enables module metrics (default true)
20. Configures SLO for DistributionSummary metrics
21. Enables collection of engine metrics/telemetry (default is false)
22. Enables module tracing (default true)

Applications

You can register in Camunda user JavaDelegate which will be registered in the context by their full class name (canonicalName) and by their simplified class name (simpleName):

Java Kotlin

@Component
public final class SimpleDelegate implements JavaDelegate {

    @Override
    public void execute(DelegateExecution delegateExecution) throws Exception {

    }
}

@Component
class SimpleKoraDelegate : JavaDelegate {

    fun execute(delegateExecution: DelegateExecution) {

    }
}

You can also register specialized KoraDelegate, which allow, in addition to standard naming, to register an executor with an arbitrary name in context via the key() method:

Java Kotlin

@Component
public final class SimpleDelegate implements KoraDelegate {

    public String key() {
        return "myKey";
    }

    @Override
    public void execute(DelegateExecution delegateExecution) throws Exception {

    }
}

@Component
class SimpleKoraDelegate : KoraDelegate {

    fun key() = "myKey"

    fun execute(delegateExecution: DelegateExecution) {

    }
}

Engine configuration

It is possible to register user ProcessEngineConfigurator that allow configuring ProcessEngine:

Java Kotlin

@Component
public final class SimpleProcessEngineConfigurator implements ProcessEngineConfigurator {

    @Override
    public void setup(ProcessEngine engine) {

    }
}

@Component
class SimpleProcessEngineConfigurator : ProcessEngineConfigurator {

    fun setup(engine: ProcessEngine) {

    }
}

Plugins

You can register arbitrary Plugin by providing them as components in a dependency container.