Making Work Flow

MakingWorkFlow
ExperienceswithOpenSourceProcessAutomationTechnologies
tiesebarrell

Aboutme
• Consultant at GROUP9
• Applying OSS BPM in (enterprise) projects
• Public, Pension, Energy and Mobility sectors
tiesebarrell
http://airquill.io
2019|MakingWorkFlow|TieseBarrell

Untangling:Logic
• Domain
• Persistence
• Views (query/read)
• Actions (command)
• Integration
• Process
• Decision
• ...

Architecture

Flow

Untanglingthespaghetti
• Domain complexity at the heart of the application
• Domain logic abstracted from APIs, storage and
integration
• Process capability with the business logic
• CQRS: separate actions from views

Designing
• Event storming: structure & understanding
• Prototype domain and process
• Contextual diagram: process and domain in one view

Data
Theprocessdoesn'tneedyourdata!
http://airlink.cloud/dat

Processeseverywhere
Ifallyouhaveisagoodarchitecture...
...everythingstartstolooklikeaprocess.

Executingcommands
@ApplicationScoped
public class RegistrationDelegate() {
@Inject
private Registrations registrations;
@Transactional(TxType.MANDATORY)
public void confirmRegistration(String registrationId) {
Registration.Id id = new Registration.Id(registrationId);
Registration registration = registrations.get(id); // get
registration.confirm(LocalDateTime.now()); // execute
registrations.update(registration); // update
};
}

Reactingtoevents
@ApplicationScoped
public class RegistrationCancelledProcessor {
@Inject
private RuntimeService runtimeService;
@Transaction(TxType.MANDATORY)
public void process(
@Observes(during = TransactionPhase.BEFORE_COMPLETION) Registration.Cancelled event) {
this.runtimeService.startProcessInstanceByMessage(
"registration-cancelled",
event.getRegistrationId());
}
}

Baseclasses
public abstract class SynchronousEventProcessor<E extends DomainEvent> {
@Transactional(TxType.MANDATORY)
public void processSynchronous(@Observes(during = TransactionPhase.BEFORE_COMPLETION) E event) {
this.process(event);
}
protected abstract void process(E event);
}

Baseclasses
public interface DomainEvent {
default void fire() {
// ...
}
}
public abstract class Repository<A extends AggregateRoot<I>, I> {
// add, update...
}
public abstract class Entity<I> {
public abstract I identity();
// equals, hashCode based on identity()
}

Multi-Tenancy
• Several contexts in the same application
• Domain is agnostic
• Process records tenancy
• Propagate (user) context to process
• Propagate context from process to domain

Contexttoprocessengine
@ApplicationScoped
public class MyTenantIdProvider implements TenantIdProvider {
@Inject
private Tenants tenants; // repository view of thread-local tenants
@Override
public String provideTenantIdForProcessInstance(
TenantIdProviderProcessInstanceContext context) {
this.tenants.current()
.map(t -> t.identity().getTenant())
.orElse(null);
}
// forCaseInstance, forDecisionInstance...
}

Contextfromprocessinstance
public class ProcessApplication extends AbstractProcessApplication {
@Inject
private Tenants tenants;
@Override
public <T> T execute(Callable<T> callable, InvocationContext context) {
Execution execution = (Execution) context.getExecution();
String tenantId = execution.getTenantId(); // tenant context from process engine
if (tenantId == null) {
this.tenants.reset();
} else {
this.tenants.selectTenant(new Tenant.Id(tenantId));
}
}
}

Hexagonalpitfalls
• Executing a technical model
http://airlink.cloud/nem
• A process sub domain (service)
• Interaction between adapter hexagons
• Everything is a domain action

Userinteraction
• Task specific screens
• Screen populates itself (data)
• Task specific view models and commands
• Generic endpoints on process hexagon

Usecases
Workflow patterns
• 4 eyes, Retain familiar
Batches (single run)
• Aggregate migration
• Process migration
What's going on?
• Metrics
• Progress & contextual tasks
• Technical state management

Conclusion
• Combine DDD, Hexagonal and Embeddable process engine
• Create flow in your process and processes
!
• Work however you want
• Just the right tools for process automation

Thankyou
Resources
http://airquill.io
Hexagonal Architecture by Alistair Cockburn:
http://airlink.cloud/hex

Making Work Flow

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