Human Centric

Architecture



Jacky Chan

in/jackyarch

About Jacky...


Jacky Chan

Executive Director - Architecture
J.P. Morgan Asset & Wealth Management

Design Thinking Trainer
ExperiencePoint

Interested in

  • Machine Learning
  • Design Thinking
  • AppSec






What is Architecture?

Architecture is

Shared understanding of the important stuff

about a system (e.g. Decisions)


~Martin Fowler
//Who needs an Architect?//

What is

 

             

HUMAN

CENTRIC

DESIGN?

Human Centric Design is

a holistic understanding of the interests or needs of humans who will receive or use the product, service or system.

Challenges

  • Translations
  • Complex
  • Waterfall and Reactive

Opportunities

  • Consistent
  • Simple and Intuitive
  • Agile and Responsive

Consistent





Bounded Context

  • A entity is well defined in a bounded context
  • Person in "Sales" context is referring to a Sales Person

Ubiquitous Language

  • A language used by all team members to connect all the activities of the team

Ubiquitous Language

The same terminology is also used in
  • Jira Stories
  • Application Code
  • Table and Column
  • Testing Cases
  • RESTful API Definition

Simple & Intuitive





Tradtional vs Clean Architecture

Intuitive REST API

  • Industry Convention
  • Documentation with Examples
Use Plural Nouns to represent resources
  • /customers/2345
  • /accounts/A304935

Use proper HTTP verb

Read GET /customers/2345
GET /customers?size=20&page=3
Create POST /customers
Replace Whole PUT /customers
Modify partial PATCH /customers
Delete Delete /customers

Documentation with Example

  • Try it out and learn
  • Pre-filled examples

Functional Testing

Gherkin allows us to articulate test cases in plain English using:

Given

When

Then

Typical Functional Testing

Scenario: Login with bad password

  • Given launch URL https://app/login
  • When http get parameter user id equals to 'Jacky'
  • And http get parameter password equals to *****
  • Then error page is returned
  • And return to login page https://app/login

A better approach

Scenario: Login with bad password

  • Given launch app using browser Chrome
  • When I type user name 'Jacky'
  • And I type an incorrect password
  • Then I see error message "Invalid username/password"
  • And I stay on the login page

Self-Descriptive Code


						/** 
						 * Find customers who have more than a given amount in saving account
						 * @param amount Amount in Saving Account
						 */
						public Customer findCustomer(BigDecimal amount);
						


						public Customer findCustomersWithSavingAccountMoreThan(BigDecimal usdAmount);






Agile and Responsive

Monolithics is HUGE

  • Slower to compile
  • Slower to deploy
  • Slower to deliver

Microservices is smaller

But does it always enable us to deliver faster

But does it always enable us to deliver faster?

Symptoms of something goes wrong

  • Lot of deployment coordinations
  • Lot of testing coordinations
  • Longer downtime
  • Excessive joins between Microservices
  • Running costs is even higher than Monolithic

Some suggestions

  • API versioning
  • end-to-end -> Consumer Contract Testing
  • BlueGeen Deployment, Canary Deployment
  • Domain Driven Design

People improve through

How might architecture get feedback for improvement?

Service Level Objectives

Key Measurable Characteristics

  • Availability
  • Throughput
  • Response Time
  • Resiliency

Design automated measurement for SLO into architecture

Responsive architecture

THANK YOU

https://goo.gl/ex1u87