How to Effectively Build Web APIs for Microservices

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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.

Technology

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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Retrieval augmented generation (RAG) is the most popular style of large language model application to emerge from 2023. The most basic style of RAG works by vectorizing your data and injecting it into a vector database like Milvus for retrieval to augment the text output generated by an LLM. This is just the beginning. One of the ways that we can extend RAG, and extend AI, is through multilingual use cases. Typical RAG is done in English using embedding models that are trained in English. In this talk, we’ll explore how RAG could work in languages other than English. We’ll explore French, Chinese, and Polish.

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Following the popularity of "Cloud Revolution: Exploring the New Wave of Serverless Spatial Data," we're thrilled to announce this much-anticipated encore webinar. In this sequel, we'll dive deeper into the Cloud-Native realm by uncovering practical applications and FME support for these new formats, including COGs, COPC, FlatGeoBuf, GeoParquet, STAC, and ZARR. Building on the foundation laid by industry leaders Michelle Roby of Radiant Earth and Chris Holmes of Planet in the first webinar, this second part offers an in-depth look at the real-world application and behind-the-scenes dynamics of these cutting-edge formats. We will spotlight specific use-cases and workflows, showcasing their efficiency and relevance in practical scenarios. Discover the vast possibilities each format holds, highlighted through detailed discussions and demonstrations. Our expert speakers will dissect the key aspects and provide critical takeaways for effective use, ensuring attendees leave with a thorough understanding of how to apply these formats in their own projects. Elevate your understanding of how FME supports these cutting-edge technologies, enhancing your ability to manage, share, and analyze spatial data. Whether you're building on knowledge from our initial session or are new to the serverless spatial data landscape, this webinar is your gateway to mastering cloud-native formats in your workflows.

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How to Effectively Build Web APIs for Microservices

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

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

3. Evolution of Enterprise Architecture

4. ● 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

5. ● 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

6. ● 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

7. ● 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

8. Integration never disappears! 8

9. 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

10. Microservice Layered Architecture

11. 11 Source: Integration Microservices by Kasun Indrasiri

12. 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. 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. 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.

15. Microservices with WSO2

16. 16

17. Demo

18. Sample Scenario 18 Consumer API Service µ Service 1

19. APIM Component Architecture 19

20. API Operator Flow 20

21. New Requirement 21

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

23. ● 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?

24. Why reinvent to Integrate?

25. Integrate with low code 25 Consumer µ Gateway

26. EI Operator Flow 26

27. Question Time!

28. wso2.com Thanks!