Piye carane nangani dukungan offline lan sinkronisasi data?

Question

Accepted Answer

Mobile apps asring kudu ngerjani **offline** (tanpa/koneksitas ala-ala) lan **sinkronisasi** data nalika koneksitas bali. Iki melibatake panyimpenan data lokal, deteksi koneksitas, antren perubahan, lan sinkronisasi — aspek sing narik nanging penting kanggo mobile apps sing kuat.

## Kenapa dukungan offline dadi penting

```text
Mobile devices have UNRELIABLE connectivity (no signal, poor network, airplane mode):
  → apps that break/are useless offline frustrate users
  → OFFLINE-FIRST apps work regardless of connectivity → better, more robust UX
→ Handle: reading cached data offline, making changes offline, syncing when back online.
```

## Unsur-unsur utama dukungan offline

```text
✓ LOCAL STORAGE — cache data locally (SQLite, WatermelonDB, AsyncStorage/MMKV) so the
  app works with local data offline
✓ DETECT CONNECTIVITY — @react-native-community/netinfo (online/offline status)
✓ OFFLINE WRITES — let users make changes offline; QUEUE them locally
✓ SYNC — when back online, send queued changes to the server; pull server updates
✓ Show appropriate UI (offline indicator, pending/syncing status)
```

## Tantangan sinkronisasi

```text
⚠️ CONFLICTS — the same data changed locally AND on the server (or by another device):
  → need a conflict-resolution strategy (last-write-wins, merge, server-wins, manual)
⚠️ ORDERING and retries for queued operations; idempotency
⚠️ Keeping local and server data CONSISTENT eventually
→ Tools: WatermelonDB (offline-first DB with sync), RxDB, or custom sync logic;
  React Query (caching helps); some backends (Firebase, PouchDB/Couch) offer sync.
```

## Kenapa iki dadi penting

Pamahaman babagan dukungan offline lan sinkronisasi data minangka ilmu tingkat senior sing berharga amarga **piranti mobile nduweni koneksitas sing ora stabil**, lan nangani skenario offline kanthi apik ndadekake apps iku kuat lan gampang diguna, mula penting kanggo mobile apps sing berkualitas.

Koneksitas mobile pancen ora stabil (ora ana sinyal, jaringan ala, mode pesawat), lan apps sing **mumet utawa dadi ora ana gunane nalika offline nyebabake ngakeh keluhan pangguna** — mula ndhukung penggunaan offline (maca data cached, nggawe perubahan, sinkronisasi nalika balik online) ndadekake apps luwih kuat lan nyenengake, pertimbangan kualitas sing penting kanggo mobile.

Pamahaman babagan **unsur-unsur utama** — **panyimpenan lokal** (cache data supaya app ngerjani offline, liwat SQLite/WatermelonDB/MMKV), **deteksi koneksitas** (NetInfo kanggo status online/offline), **penulisan offline** (ngidini pangguna nggawe perubahan offline lan antren iku lokal), **sinkronisasi** (ngirim perubahan antren lan nyedhot update nalika balik online), lan nampilake UI sing layak (indikator offline, status sinkronisasi) — nyakup apa sing butuh kanggo mbangun dukungan offline.

Critis, pamahaman babagan **tantangan sinkronisasi** iku apa sing nampakake kedalaman: **konflik** (data sing padha diganti ing macem-macem papan, butuh strategi resolusi konflik kaya last-write-wins, merge, utawa manual — masalah sing pancene angel), urut operasi, retry, idempotency, lan eventual consistency antara data lokal lan server.

Iki dadekake offline sync masalah sing narik lan sophisticated, lan pamahaman babagan tantangan-tantangan (ora mung seneng-seneng path) nampakake pamahaman tingkat senior.

Ngerti babagan tools (WatermelonDB lan RxDB kanggo offline-first sync, React Query kanggo caching, backend sing bisa sinkronisasi) nyedhiyake pilihan praktis.

Amarga koneksitas mobile iku ora stabil lan apps sing kuat nangani skenario offline (UX sing bermakna lan pembeda kualitas), lan amarga dukungan offline lan sync melibatake tantangan nyata (panyimpenan lokal, deteksi koneksitas, antren, lan khususnya resolusi konflik) sing pamahaman apik nampakake keahlian senior, pamahaman babagan dukungan offline lan sinkronisasi data iku ilmu tingkat senior sing berharga — penting kanggo mbangun mobile apps sing kuat lan ngerjani kontone koneksitas, ngatasi masalah sing pancene challenging (khususnya konflik sinkronisasi) lan nampakake kedalaman sing dikarepake kanggo posisi senior sing mbangun pengalaman mobile berkualitas.