You're Building a Distributed System!

•

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Whether you know it or not, you're building a distributed system. This becomes painfully obvious when taking Ember apps into the developing world. Flaky network connections pose real challenges for developers building stateful applications in the browser. This talk is about my trials and tribulations taking Ember offline in Africa. We’ll look at the tools necessary to venture offline, how they apply to Ember specifically, and a little bit of theory to drive home the hard facts about how much fun you’ll have building a distributed system!

Ingénierie

Local to the user’s browser.
Cleared on page refresh.
Not persisted to a server.

Memory
(Ephemeral)
Ember Data
Application

Memory (DS.Store)
(Ephemeral)
Memory
(Ephemeral)
Ember Data
Application

Memory (DS.Store)
(Ephemeral)
Memory
(Ephemeral)
Browser
Ember Data
Application

Memory (DS.Store)
(Ephemeral)
Memory
(Ephemeral)
Browser
Ember Data
HTTP
Disk
(Permanent)
Server
Application

State
Ephemeral State
Permanent State
Semipermanent State

Lives in the browser.
Transitory.
Written to disk.

Disk
(Semipermanent)
Memory (DS.Store)
(Ephemeral)
Memory
(Ephemeral)
Browser
IndexedDB
Ember Data
HTTP
Disk
(Permanent)
Server
Application

Disk
(Semipermanent)
IndexedDB
Memory (DS.Store)
(Ephemeral)
Memory
(Ephemeral)
Browser
Ember Data
HTTP
Disk
(Permanent)
Server
1
2
3
Application

Computer A
Computer B
Computer CComputer D
Computer N

CAP Theorem
Consistency
Availability
Partition Tolerance

Browser Server
Available
IndexedDB
(Semipermanent)

The choice between being
consistent or available.

Browser Server
Available + Inconsistent
IndexedDB
(Semipermanent)

Disk
(Semipermanent)
IndexedDB
Memory (DS.Store)
(Ephemeral)
Memory
(Ephemeral)
Browser
Ember Data
HTTP
Disk
(Permanent)
Server
Application

CouchDB + PouchDB
Firebase
Orbit.js
CRDTs

Go offline
Minimize data loss
Zero latency UIs
WIP (Work in Progress)

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