How to Effectively Build Web APIs for Microservices

Dec 18, 20203 likes392 views

Presentation by: Indika Sampath, Senior Technical Lead, WSO2 Rajith Roshan, Technical Lead, WSO2 In modern microservices architectures, a simple API request is deconstructed and decoupled into fine-grained API requests. Multiple microservices that work in collaboration handles these API requests. Under the hoods, these microservices connect to other microservices and run complex integration logic. By using the correct tools and following industry standards, developers can build their microservices integration layer as well as the web API layer more efficiently and effectively.

How to Effectively Build Web APIs for
Microservices
APIDays Paris - December 2020

Hello!
Rajith Roshan
Indika Sampath
Technical Lead
indikas@wso2.com
rajithr@wso2.com
Senior Technical Lead

● Designed to facilitate numerous
business requirement
● Software Application offer
hundreds of functions generally
piled into a single runtime
● Use propriety point to point
communication
Monolithic Applications
4

● Introducing the concept of
Service
● Each business functionality is
often implemented as Web
Services
● Expose composite services from
ESB layer
Service Oriented Architecture (SOA) and Enterprise Service Bus
(ESB)
5

● Exposing business functionalities
as managed services/APIs
become a key aspect
● Use API Management/API
Gateway layer on top of the
existing SOA implementations
● Hide the complexity of Web
Service related technologies such
as SOAP, WS-Security, WSDLs
etc.
API Management
6

● Overcome monolithic nature of ESB and service hosting runtime
● Encourage to develop a single application as suite of small and independent
services
● Demolish ESB and Application Server layers, disperse logic into services and
made them accessible through API Manager/Gateway
Microservices
7

9
Where is Integrations?
● Where do we implement functionalities that were offered from ESB
⦿ message routing
⦿ service compositions/chaining
⦿ protocol and message format transformations
⦿ resiliency patterns and various other EIPs?
● Some microservice implementation had the API Gateway as the main
component that take care of various service compositions and orchestrations.
● Some ESB vendors try to resurrect the ESB in microservice architecture, owing
to its fundamental incompatibilities

11
Source: Integration Microservices by Kasun Indrasiri

12
Core/Atomic Services
● Fine-grained self-contained services (no external service dependencies) at the
bottom layer
● Mostly comprise of the business logic and less or no network communication
logic

13
Composite/Integration Services
● ESB/integration capabilities(such as EIPs, resiliency and stability patterns) are
realized in Microservices architecture at the composite/integration services
layer.
● These services also could bridge the other legacy and proprietary systems(e.g
SAP ERP), external web APIs (e.g. Salesforce), shared databases etc.

14
API Services/Edge Services
● Expose a selected set of your composite services or even some atomic service
as managed APIs using API services/Edge services.
● Special type of composite services, that apply basic routing capabilities,
versioning of APIs, API security patterns, throttling, apply monetization, create
api compositions etc.

Sample Scenario
18
Consumer API Service µ Service 1

Implement New Microservice
22
Consumer API Service µ Service 1 µ Service 2
µ Service 3

● Implement the logic
● Re Implement the error handling
● Address network resiliency through code
● New resources for the new code running
Coding new requirement Can be redoing same thing
23
Can service mesh solve these problems?

Integrate with low code
25
Consumer µ Gateway

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