[WSO2 Integration Summit Bern 2019] API-led Integration

API-led Integration
Chathura Kulasinghe
Associate Lead Solutions Engineer
INTEGRATION

The LEGO story of
the Modern Enterprise

Businesses, created in Digital form
image-source: https://www.thebalancecareers.com/
EVALUATE DESTINATIONS
BOOK HOTELS
BOOK FLIGHTS
RENT A CAR
ADD CALENDAR ENTRIES

Businesses, created using Building-blocks
Hotel companies
Airline companies
Car Rental companies
CheapHires
Rent your ride
Book a Car
Crown Hotel
Elephant Safari Hotel
Summit Lodge
Comfy Jets 𝟆
Royal Airlines
Flylight.com

My work hasn’t been
started yet. I need to
know what’s available
out there.
Please start using this
prototype and give us
feedback.
I understand what you
need. Please wait until
we build and deliver it.
The Market & Competition

Avoid the “Stopwatch”
OpenAPI
(contract)
APIAPIAPI
Mock Response
Generator
Client Applications
<Under Construction/>
{ Functional Backend }
API Gateway

Step 2: composition of
the functional backend

API Facade Pattern
APIAPIAPI
Mock Response
Generator
Client Applications
API Facade Mediation
{ Composite Artefact }
{ Functional Backends }

The LEGO story applied in
application context

Functional Backend 1
(REST API)
An example: Service-chaining
OpenAPI
(contract) API
Mock Response
Generator
Client’s expectation ↑
Composition of expected functionality to Expose as an API ↓
HTTP / REST
Read Request Payload
Create new REST Payload
Invoke REST API
Read Response Payload
Create new SOAP Payload
Invoke SOAP Web Service
Read Response Payload
Respond to REST client
Functional Backend 2
(SOAP Web Service)
CompositeAPI

(Agile) Integration is The Key
OpenAPI
(contract) API
Mock Response
Generator
Client’s expectation ↑
Composition of expected functionality to Expose as an API ↓
CompositeAPI
HTTP / REST

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EI 7X SERIESEI 6X SERIES
WSO2 ENTERPRISE INTEGRATOR
````````````
WSO2 Enterprise Integrator already
contains integration runtimes, message
brokering, business process modeling,
analytics and visual tooling capabilities.
This can be installed as a JVM based
server where you would deploy multiple
integration artefacts together.
Centralised / Server-like Decentralised / Cloud-native

API Facade Pattern - Centralised Deployment
APIAPIAPI
Mock Response
Generator
Client Applications
API Facade Mediation
{ Composite Artefact }

...in a Microservices Architecture
WSO2 Micro
Integrator
WSO2 API Manager
Micro Gateway
Client Applications

Tooling...
1. Drag-and-drop visual editor
2. Intellisense-enabled source editor
3. In-built Docker, Kubernetes, and
cloud deployment capabilities
4. In-built testing and debugging with
embedded Micro Integrator
runtime
5. Integration-templates for rapid
development

The “Integration Lifecycle”

● Identifying the boundaries / API product
● Identifying the stakeholders
● Roadmap and release plan
● Faster & richer development tools
○ IDE tools, Enterprise Integrator, API Publisher, Swagger editor, Ballerina
● Review & iterate
○ Code-reviews, git-ops
Plan & Develop

● Ballerina modules published to the central
● EI / SP / IS connectors published to the WSO2 enterprise repo
● EIP templates - architecture repositories
● API developer portal & discovery
Reuse

● Multifaceted execution models
○ Private / Public / Hybrid
● Traditionally centralized
● Disaggregated micro proﬁles / containers
● Platform evangelism
○ Branding, hackathons, marketing, content and document
assistance
Run & execute

● Governance (design / development / runtime)
● Observability
○ Tracing, dependency analysis, impact analysis
● Version management
○ Deprecation policies and client acknowledgement
Manage

[WSO2 Integration Summit Bern 2019] API-led Integration

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