Apa iku event-driven architecture?

Question

Accepted Answer

**Event-driven architecture (EDA)** minangka desain ing mana komponen komunikasi kanthi ngasilake lan tumindak marang **events** (perkara sing wis kelakon) — tinimbang panggonan langsung. Iki ngaktifake loose coupling, skalabilitas, lan responsivitas, lan umum ing sistem terdistribusi modern.

## Apa event-driven architecture iku

```text
Components communicate via EVENTS (a notification that something happened):
  → PRODUCERS emit events ("order placed", "user signed up") without knowing who handles them
  → CONSUMERS react to events they care about (asynchronously)
  → an event BROKER/bus (Kafka, message queue) routes events
→ components are DECOUPLED → they react to events, not call each other directly.
```

## Pola lan manfaat

```text
PATTERNS:
  → PUB/SUB → publish events; multiple subscribers react
  → EVENT STREAMING (Kafka) → durable event logs; consumers process streams
  → EVENT SOURCING → store state as a sequence of events (the events ARE the source of truth)
  → CQRS → separate read/write models, often event-driven
BENEFITS:
  ✓ LOOSE COUPLING → producers/consumers independent (add consumers without changing producers)
  ✓ SCALABILITY → async, distribute load; consumers scale independently
  ✓ RESPONSIVENESS → react to events in real time; extensible (new consumers for new needs)
  ✓ RESILIENCE → events buffered; components fail independently
```

## Trade-offs

```text
⚠️ COMPLEXITY → harder to understand flow (indirect, async); eventual consistency
⚠️ DEBUGGING/tracing across events is harder; need to handle ordering, duplicates,
   failures (idempotency)
→ powerful for decoupled, scalable, real-time systems, but adds distributed complexity.
```

## Ngapa iki penting

Nemahami event-driven architecture minangka pengetahuan tingkat senior sing berharga amarga iku **gaya arsitektur penting kanggo bangun sistem sing decoupled, scalable, responsive**, saya-saya umum ing sistem terdistribusi modern, dadi relevan kanggo system design.

EDA — ing mana komponen komunikasi kanthi ngasilake lan tumindak marang **events** tinimbang panggonan langsung — ngaktifake gaya desain sistem loose-coupled sing dhasarane beda.

Nemahami model inti (producers ngasilake events tanpa ngerti sapa sing nggarap, consumers tumindak kanthi asynchronous, event broker ngruteake events, kasile komponen sing decoupled) njelaske ayo iku bisa.

Nemahami **patterns** — pub/sub (multiple subscribers tumindak marang events), event streaming (Kafka's durable event logs), **event sourcing** (nyimpen state minangka urutan events sing minangka sumber kasunyatan), lan CQRS (pisan model read/write) — nutupi pendekatan event-driven sing penting.

Nemahami **manfaat** — **loose coupling** (producers lan consumers independen, dadi consumers anyar bisa ditambah tanpa ngganti producers — ngaktifake extensibility), **scalability** (async processing, consumer scaling independen), **responsiveness** (tumindak marang events in real time), lan **resilience** (events buffered, komponen gagal kanthi independen) — njelaske ngapa EDA berharga kanggo sistem modern.

Nemahami **trade-offs** — kompleksitas nambah (alur async sing ora langsung luwih angel dimangerteni, eventual consistency, debug lan tracing luwih angel antarane events, lan perlu nggarap ordering, duplicates, lan failures via idempotency) — nggambarake perkara seimbang, amarga kekuwatan EDA dadi karo kompleksitas sistem terdistribusi.

EDA saya-saya umum ing microservices lan sistem real-time.

Amarga event-driven architecture minangka gaya penting kanggo bangun sistem decoupled, scalable, responsive (saya-saya umum ing sistem terdistribusi modern) kanthi manfaat lan trade-offs sing signifikan, lan amarga nemahami model, patterns, manfaat, lan kompleksitas iku relevan kanggo system design, nemahami event-driven architecture minangka pengetahuan tingkat senior sing berharga — gaya arsitektur penting kanggo sistem decoupled, scalable, real-time, saya-saya umum ing arsitektur terdistribusi lan microservices modern, lan ngalembakake keselasan arsitektur sing dikarepake kanggo peran senior ndesain sistem modern.