Avoiding the Legacy Trap Round 1: the New Web Development Stack 1 - - PowerPoint PPT Presentation

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Feb 05, 2024 7 likes •167 views

Avoiding the Legacy Trap Round 1: the New Web Development Stack 1 ---- DRAFT ---- or a 30 minute fly-by 2 What is a Legacy Trap and how is it avoided? In this context: adopting the familiar for unsuitable use continued investment

SLIDE 1

Avoiding the Legacy Trap

Round 1: the New Web Development Stack

SLIDE 2

--- DRAFT ----
r a 30 minute fly-by

SLIDE 3

What is a Legacy Trap and how is it avoided?

In this context:

adopting the familiar for unsuitable use continued investment beyond economic life

always consider a replacement option

plan best path from status quo to goal ignore "sunk" costs

SLIDE 4

Fading Technologies

XML ==> XHTML, XForms becoming niche approaches
cross-compiling and device-specific applications

write once, use every where is still alive

relational DBMS and normalization for the Web

JSON, map/reduce, indexed native store schema & parsing only as needed

Tightly coupled client-server web applications

fault-tolerance through local storage off-line mode provide recovery and let it fail rather than fighting inevitable

SLIDE 5

5 Essential Technologies

HTML (aka HTML5)
NoSQL database [CouchDB]
Server-side JavaScript [Node.JS]
AMQP (+ SMS, MMS, IM, BT, 3G, ...) [RabbitMQ]
Thin Client / Kiosk / Mobile [LiteClient]

SLIDE 6

HTML (aka HTML5)

as of January: HTML is a "live standard" with

support of browser-makers

commitment to open, cross-device platform for

Web

current features include:

SLIDE 7

NoSQL database [CouchDB]

JSON document store
fast B2-tree indexing
built-in concurrence, fault-tolerance (Erlang OTC)
built-in replication / sync with collision resolution
deployable on cellphones and server clusters
introduces 2-tier applications, app update by sync

SLIDE 8

Server-side JavaScript [Node.JS]

SLIDE 9

AMQP (+ SMS, MMS, IM, BT, 3G, ...) [RabbitMQ]

SLIDE 10

Thin Client / Kiosk / Mobile [LiteClient]

SLIDE 11

5 Seed Projects

HUP2x -- Heads-UP double entry
TABS -- Track Assets / Balance Stocks
SNAPS -- Scanned Network-Available PDF Store
MOW5 -- Medical Officer Workstation (HTML5)
OpStats -- Operational Status & Statistics

SLIDE 12

HUP2x: Heads-Up double entry

Data entry from scanned forms where:

Cursor next to hand-recorded value No mouse, no customized paper forms Separately entered twice for error correction

Improvements over traditional heads-down:

Data linked to image --> process improvements Images provide backup to patient summaries

SLIDE 13

TABS: Track Assets / Balance Stocks

SLIDE 14

SNAPS: Scanned Network-Available PDF Store

SLIDE 15

MOW5: Medical Officer Workstation (HTML5)

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