Workflow vs Use case

Workflow

The workflow is the long-running process required to accomplish an operation

Use case

A use case represents a business action.

Şöyle düşünebiliriz.

Use case:

    create/update/delete business object

    apply business rule

    complete a business operation

    produce business events

Book Keepin

The retry count, lease, sent flag, processing flag, backoff timestamp, etc. exist solely so the workflow can safely coordinate work.

Örnek

Use case : Register User

Implementation:

- Validate email is unique

- Create user

- Assign default role

- Store user

- Publish UserRegistered event

Workflow şöyle. The workflow spans time, retries, external systems, and multiple transactions.

User Registration Workflow

  - Register User use case

  - Send verification email
  - Wait for user click
  - Timeout after 7 days
  -  Resend email
  -  Activate account

Db Book Keeping Operations

Hem workflow, hem de use case içinde book keeping transactions olabilir. Bunlar use case anlamına gelmezler.

Örnek

X Delivery Workflow
│
├─ find pending delivery
├─ mark SENDING                 ← DB operation
├─ send UDP segment 1
├─ wait for ACK
├─ send UDP segment 2
├─ wait for ACK
├─ timeout?
│    └─ mark BACKOFF            ← DB operation
│
├─ retry
│
├─ final ACK
│    └─ CompleteDelivery    ← Use case
│
└─ publish resulting events