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#OfflineFirst
#OfflineFirst
Mit Menschen Software
für Menschen entwickeln
Ulrich Deiters

Software Architect @ T-Systems Multimedia Solutions GmbH

https://xing.to/ulid
Uli

@ulid000

#Berlin

#Fahrrad

…
Noch mehr: http://offlinestat.es
https://www.telekom.de/start/netzausbau
https://www.telekom.de/breitbandausbau-deutschland?ActiveTabID=map
Stand: August 2017
https://www.telekom.de/start/netzausbau
https://www.telekom.de/breitbandausbau-deutschland?ActiveTabID=map
Stand: August 2017
https://www.telekom.de/start/netzausbau
https://www.telekom.de/breitbandausbau-deutschland?ActiveTabID=map
Stand: August 2017
https://opensignal.com/
https://opensignal.com/
Stand: August 2017
https://opensignal.com/
Stand: August 2017
Was war nochmal vor ONLINE?
Letdorf / CC-BY-SA-3.0
Offline - das hatten wir doch schon immer!

Oh, offline geht auch. Prima.

Was das geht auch offline? Wow!
Trappatoni / CC-BY-SA-3.0
App-Cloud ist das neue Client-Server
Client/App Server/Cloud
Qualitätsattribute
ISO 25010:

Reliability (Zuverlässigkeit)

Maturity (Reife)

Availability (Verfügbarkeit)

Fault Tolerance (Fehlertoleranz)

Recoverability (Wiederherstellbarkeit)

Performance Efficiency (Effizienz)

Security (Sicherheit)

…
https://www.iso.org/obp/ui/#iso:std:iso-iec:25010:ed-1:v1:en
https://www.embarc.de/software-qualitaet-iso-25010/
Resilience
CAP Theorem (Eric Brewer, 1998)
http://robertgreiner.com/2014/08/cap-theorem-revisited/
https://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have-changed https://martin.kleppmann.com/2015/05/11/please-stop-calling-databases-cp-or-ap.html
http://abiasforaction.net/cap-theorem/
Linearizable Consistency Availability
Network Partition Tolerance
In the case of a network Partition choose one:
Linearizable Consistency vs. Availability
context: read/write operations
Eventual Consistency (Werner Vogels, 2008)
https://dl.acm.org/citation.cfm?doid=1466443.1466448

https://www.allthingsdistributed.com/2008/12/eventually_consistent.html
Wenn keine weiteren
Schreibvorgänge stattfinden 

und keine Netzwerkfehler existieren,
werden die Daten schließlich 

über alle Knoten konsistent.
Systemüberblick und Herausforderungen
UI
Logic
ServiceService
Synchronisation
Validierung
Sicherheit/

Verschlüsselung
Client/App Server/Cloud
User Experience
Caching
Service Worker
PWA

„A service worker is a
programmable network proxy
that lets you control how
network requests from your
page are handled.“

Fetch is the new XHR

Lifecycle

Offline Cookbook

Google Workbox
https://jakearchibald.com/2014/offline-cookbook/
https://developers.google.com/web/tools/workbox/ Portions of this page are reproduced from work created and shared by Google and used according to terms described in the Creative Commons 3.0 Attribution License.
Stale While Revalidate
Service Worker
UI
Logic
REST API
Service

Worker
JS Web App im Browser vert.x
GET /message
App Cache Memory
Demo
https://github.com/ulid000/offline-first-sw-serverhttps://github.com/ulid000/offline-first-sw
Database Synchronisation
PouchDB 

=> Browser/node
(JavaScript)

Apache CouchDB 

=> Server (Erlang)

Multiversion Concurrency
Control (MVCC)

Replication Protocol

Conflict Resolution
Image from https://github.com/oreilly/couchdb-guide available under a Creative Commons Attribution license
Database Synchronisation
UI
Logic
CouchDB

REST API
PouchDB
JS Web App im Browser CouchDB
CouchDB 

Replication Protocol
Indexed DB CouchDB
Demo
https://github.com/ulid000/offline-first-pouchdb
Google Android Architecture Components
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
https://developer.android.com/topic/libraries/architecture/guide.html
Google Android Architecture Components - NetworkBoundResource
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
https://developer.android.com/topic/libraries/architecture/guide.html
Architecture Components Sample App
Activity/
Fragment
ViewModel
GitHub

REST API
Repository

Android App GitHub
HTTP GET …
SQLite
Demo
https://github.com/googlesamples/android-architecture-components/tree/master/GithubBrowserSample
Model
Remote

Data

Source
Room
https://experience.sap.com/fiori-design-ios/article/offline/
https://www.sap.com/developer/tutorial-navigator/mobile-interactive-tutorials/offline/native-ios.html https://www.sap.com/developer/tutorials/fiori-ios-hcpms-offline-odata-introduction.html
https://help.sap.com/viewer/fc1a59c210d848babfb3f758a6f55cb1/Latest/en-US/8117b4fc553d4e1ea91129eee788677f.html
SAP Cloud Platform Mobile Services + iOS SDK Demo
UI
Logic
HCPMS

Offline Service
ODataModel
iOS App SAP Cloud Platform
MobiLink Protocol
Ultralite
OData

Demo Service
OfflineODataProvider
(OnlineODataProvider)
User Experience
Freshness
Reach
Assurance
• Zeitstempel der letzten Änderung der Daten
• Zeitstempel der letzten Synchronisation
• Erreichbar
• Nicht erreichbar
• Unbekannt
• Gespeichert
• Synchronisiert
• Speicherung/Synchronisation fehlgeschlagen
• Unbekannt
https://medium.com/@jessebeach/my-biggest-takeaway-from-the-second-offline-camp-in-santa-margarita-ca-d0dd930cd02b
Expressing offline syncing to the end user
Was noch?
…
CouchDB, PouchDB, Couchbase, IBM Cloudant
realm.io
AWS AppSync
Google Firebase
Offline Data Sync in Azure Mobile Apps
Salesforce SmartSync, SmartStore
…
#OfflineFirst
Nicht nachrüsten,
sondern vorher
berücksichtigen
Danke!

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