A saga sarrafa kasuwanci da ke faɗi akan sabannin ayyuka a matsayin jerin kasuwanci na gida. Idan mataki ya kasa, saga za ta gudna kasuwancin kabareyi don sakewa matakun da suka gabata — babu rarraba akasin aiki.
Ailtata mai matakala biyu a cikin ayyuka tana sanyi, kulle alavu, da kulla kusanci. Saga suna ba da jajircewar karshe ba tare da kullun rarraba ba.
Ayyuka suna mayar da martani ga abubuwan jitu na juna; babu mai haɗa tsakiya.
Order ─OrderCreated→ Payment ─PaymentDone→ Inventory ─Reserved→ Shipping
◀───────── (on failure, each emits a compensating event) ─────────
Mai haɗa ya faɗi kowane aiki abin da ya buƙata ya aiƙa kuma ya mayar da martani ga sakamakon.
┌───────────── Saga Orchestrator ─────────────┐
▼ ▼ ▼ ▼
reservePayment reserveStock createShipment (on fail: compensate all)
| Gida | Choreography | Orchestration |
|---|---|---|
| Haɗawa | Rarrabe (abubuwan jitu) | Tsakiya |
| Ƙulli | Sakici | Mai haɗa ya san jigon aiki |
| Bayyana | Wuyar bin | Sauƙi a gama-gama |
| Kyau don | Sauƙi, kaɗan matakoki | Hadaddiyya, da yawa matakoki |
Kabarey dole ne su zama idempotent kuma su haɗa yaren inda matakun asali ya ƙinda ciki. Zana su da hankali.
Saga su ne yadda za ka ci gaba da al'amarin za'a a cikin ayyuka ba tare da kuɗi da ƙulli na rarraba ba.
Zaɓin tsakanin choreography da orchestration yana cinyar sauƙi don farawa: abubuwan jitu suna tashi sanye amma suna haɓaka, yayin da mai haɗa ya haɗa walƙiya mahimmanci a tukin ƙari ɗaya.
Wacce za a gudu.