Journey to microservices

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Healthesystems is evolving their legacy platform to use microservices to modernize, remove single points of failure, and deliver software faster. They are taking a tactical approach, starting by identifying core domains and refactoring their monolithic "ball of mud" application using patterns like the strangler pattern and anti-corruption layers. This will decouple the monolith and allow migrating functionality to independent microservices over time while maintaining the existing system. Challenges include managing data across multiple databases with eventual consistency and complexity of operating the distributed system.

Presentations & Public Speaking

Journey to MicroservicesEvolving to a Distributed service based platform to accelerate software delivery

2
About us
Sam Alexander
twitter: @samalexander10
salexander@healthesystems.com
Mark Sinclair
twitter: @marksinclair
msinclair@healthesystems.com

3
Healthesystems
journey to
microservices
Evolving to a Distributed service based platform to accelerate softwaredelivery

5
Microservices
https://martinfowler.com/articles/microservices.html

10
Mental models
Business Complexity
Maintainability
Performance

DEFINITION MARKETING
Organizations which design systems ... are
constrained to produce designs which are
copies of the communication structures of
these organizations.
- Melvin Conway, 1968
12
Conway's Law

Identify Core domains
15
Core Domain
Supporting Domain
Generic Domain
Buy/Outsourced
Parity

16
Tactical approach to an individual microservice

Refactor the ball of mud
application
PRESENTATIONLAYER
BUSINESS LAYER
DATA LAYER
19

Strangler Pattern
20
All Old
users
Starting
position
users
Early days
users
Half way
users
Nearly
finished
users
All NEW
finished
• Make something new that obsoletes a small percentage of something old.
• Put them live together.
• Rinse and repeat.

Anti-corruption layer
Prevent legacy system from polluting your pristine new code.
21
Old system
Request router
New Service
Anti-corruption
Layer
Request

22
1 Multiple databases
Complexity of deploying and operating a distributed system2
Eventual consistency3
Drawbacks of a microservices architecture

Data Quality
23
Data has no meaning without context
- Create new table
New requirement
- Add new column
- Transform data

Gateway
USERS
API Gateway
External Systems
Session
Management
routing security
24

Data Consistency
Published eventEvent Store (pub/sub)
Eventually Consistent
25

Servicecomponent
Module1
Modulen
API Gateway
client request client request client request
session
management
Event Store (pub/sub)
OLAP Reporting
Business Intelligence
Data Warehouse
Enterprise
Security
Servicecomponent
Module1
Modulen
Servicecomponent
Module1
Modulen
Servicecomponent
Module1
Modulen
Servicecomponent
Module1
Modulen
26

28
Event Store
Edge Gateway
users
UI
Command
Service
HTTPGET HTTPPOST/PUT
PUBLISHEVENTS
CRUD
Event
Processor
SUBSCRIBETO EVENTS
CREATE/READ
Microservice
A Single Microservice

Questions?
30
Facebook.com/Healthesystems twitter.com/healthesystems linkedin.com/company/healthesystems youtube.com/healthesystems

In a world where software has become the key differentiator, enterprises are forced to transform the way they build, ship and run software in order to stay in the game. Competitive pressure requires applications to be rapidly and continuously upgraded with nonstop availability, and companies that lack the capacity to experiment, innovate and get new features out quickly, will be at disadvantage. This is driving many IT organisations to adopt the software design model known as microservices architecture, which quickly is gaining traction as a new way to think about structuring applications, and is changing the fundamentals of enterprise application management.

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In times of high pace development and continuous delivery, the traditional way of building enterprise applications, using a monolithic approach, has become problematic. As applications get larger and more complex, the development cycles become longer and result in less-reliable applications. Microservices architecture has been making waves among development organizations since the term was first coined in 2011. Today, microservices is on the verge of going mainstream with 36% of enterprises surveyed are currently using microservices, with another 26% in the research phase. But what exactly is microservices architecture, and is it right for your organization’s culture, skills, and needs? Vered is an experienced software engineer and team lead, specializing in web-related technology stack. Successfully accompanied products through the full R&D life-cycle, from early concept to production and maintenance.

Do microservices force us to look differently at the way we lay down and evolve our integration architecture, or are they purely about how we build applications? Are microservices a new concept, or an evolution of the many ideas that came before them? What is the relationship between microservices and other key initiatives such as APIs, SOA, and Agile. In this session, we will unpick what microservices really are, and indeed what they are not. We will consider whether there is something unique about this particular point time in technology that has enables microservice concepts to take hold. Finally, we will look at if, when, where and how an enterprise can take on the benefits of microservices, and what products and technologies are applicable for that journey.

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Microservice architectures enable development teams to bring new features and updates to market faster. But enterprises adopting microservices also experience common challenges like service redundancy, duplication, and not being able to connect to existing databases and SaaS tools easily. With an increasing number of services across the organization, visibility and governance become even more critical for IT. In this webinar, we will cover how Pivotal and Mulesoft are addressing these challenges with a modern application development and operations environment so that application developers can remain focused on generating value for customers, and operators can deploy, monitor, and scale their apps faster. Topics include how you can: * Rapidly build and deliver scalable, resilient microservices and applications implementing distributed system patterns * Easily catalogue, discover, and consume your microservices * Quickly connect your microservices to legacy or SaaS applications * Analyze API metrics and manage appropriate policies to govern interaction patterns across the services/APIs landscape Presenters: Kamala Dasika, Pivotal, Sandeep Singh Kohli, Mulesoft and Jesus De Oliveira, Mulesoft

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A microservices architecture is a type of application architecture where the application is developed as a collection of services. It provides the framework to develop, deploy, and maintain microservices architecture diagrams and services independently. Microservices are the blocks of your application and perform different services, while REST APIs work as the glue or the bridge that integrates these separate microservices. APIs can be made up, wholly or partially, out of microservices. Developers can use Microservices for a lot more, though

Dreamforce 2015 microservices

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Disposability has been a long time coming – I remember the aha when I first heard how Google dealt with hardware failures – by simply throwing out the offending boxes every once in a while, with no need to do anything immediate. At Google the software architecture meant that hardware became disposable. Today that architectural idea(l) is becoming a core design principle for Cloud Native software – 12 Factor Apps. Everything should be disposable. Except of course the data… Apps are like fish, but data is like wine. Stateless apps still require a persistence layer.

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This presentation is conducted on 14th Sept in Limerick DotNet User Group. (https://www.meetup.com/preview/Limerick-DotNet/events/xskpdnywmbsb) SlideShare Url: https://www.slideshare.net/lalitkale/introduction-to-microservices-80583928 In this presentation, new architectural style - Microservices and it's emergence is discussed. We will also briefly touch base on what are not microservices, Conway's law and organization design, Principles of microservices and service discovery mechanism and why it is necessary for microservices implementation. About Speaker: Lalit is a senior developer, software architect and consultant with more than 12 yrsof .NET experience. He loves to work with C# .NET and Azure platform services like App Services, Virtual Machines, Cortana, and Container Services. He is also the author of 'Building Microservices with .NET Core' (https://www.packtpub.com/web-development/building-microservices-net-core) book. To know more and connect with Lalit, you can visit his LinkedIn profile below. https://www.linkedin.com/in/lalitkale/ This presentation will be useful for software architects/Managers, senior developers. Do share your feedback in comments.

SELECTION MECHANISM OF MICRO-SERVICES ORCHESTRATION VS. CHOREOGRAPHY

dannyijwest

Web services is a special case of a service-oriented architecture (SOA), which is, basically, a representation of web application‘s functionality. Web service is more of a generalized concept that implies whole functionality as a whole but Microservice handles only the single specific task. MSA is emerging as an excellent architecture style enabling the division of large and complex applications into micro-scale yet many services, each runs in its own process, has its own APIs, and communicates with one another using lightweight mechanisms such as HTTP. Microservices are built around business capabilities, loosely coupled and highly cohesive, horizontally scalable, independently deployable, technology-agnostic, etc. On the other side for the business dynamic requirement these microservices need to be composed for the realization of enterprise-scale, and business-critical applications. Service composition is combining various services together to provide the solution for the user dynamic queries. There are two methods for the microservice composition i.e. orchestration and choreography. In this paper,a health case study is performed for the selection mechanism of orchestration method and choreography method in various situation.

SELECTION MECHANISM OF MICRO-SERVICES ORCHESTRATION VS. CHOREOGRAPHY

IJwest

ABSTRACT Web services is a special case of a service-oriented architecture (SOA), which is, basically, a representation of web application‘s functionality. Web service is more of a generalized concept that implies whole functionality as a whole but Microservice handles only the single specific task. MSA is emerging as an excellent architecture style enabling the division of large and complex applications into micro-scale yet many services, each runs in its own process, has its own APIs, and communicates with one another using lightweight mechanisms such as HTTP. Microservices are built around business capabilities, loosely coupled and highly cohesive, horizontally scalable, independently deployable, technology-agnostic, etc. On the other side for the business dynamic requirement these microservices need to be composed for the realization of enterprise-scale, and business-critical applications. Service composition is combining various services together to provide the solution for the user dynamic queries. There are two methods for the microservice composition i.e. orchestration and choreography. In this paper,a health case study is performed for the selection mechanism of orchestration method and choreography method in various situation.

Modernizing IT with Microservices

LeanIX GmbH

A microservices architecture is not a new style of building large scale enterprise applications. Companies like Netflix and Amazon have implemented a microservices architecture to deliver successful products over the last few years. But is a microservices architecture right for your organization? What should you focus on when getting started? How do microservices affect your business model? In this presentation you will learn: • What Microservices are • Why use Microservices • How to model Microservices • How to automatically create your Microservice EA repository • How to plan the Microservice roadmap

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This deck introduces "cell-based" reference architecture, which is API-centric, cloud-native, and microservices-friendly. Further explains the role of APIs in the cell-based approach, as well as examine how real applications are built as cells. The deck covers metrics and approaches that can be used to measure the effectiveness of the architecture and explore how organizations can implement the cell approach.

The Composable Enterprise | Yenlo - WSO2 Integration Summit 2019, San Francisco

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Dr. Paul Fremantle, CTO and Co-Founder of WSO2 presented his vision regarding the “The Composable Enterprise”. The composable enterprise is an enterprise, which is agile enough to react on a changing market and a changing customer demand. Paul Fremantle: “We cannot change the future; we only must be able to adapt the change”. To do so the Cellery framework for a micro services approach is the perfect fit to manage, govern and secure your micro services requirements. Cellery is one of WSO2’s answer to the micro services architecture approach whereby all the knowledge and components like the WSO2 Micro Gateway and WSO2 Micro Enterprise Integrator (Micro ESB), next to the WSO2 Identity Server for securing the API’s by industry standards.

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Journey to microservices

1. Journey to MicroservicesEvolving to a Distributed service based platform to accelerate software delivery

2. 2 About us Sam Alexander twitter: @samalexander10 salexander@healthesystems.com Mark Sinclair twitter: @marksinclair msinclair@healthesystems.com

3. 3 Healthesystems journey to microservices Evolving to a Distributed service based platform to accelerate softwaredelivery

4. 4 About microservices

5. 5 Microservices https://martinfowler.com/articles/microservices.html

6. 6 Key drivers to microservices

7. 7 Modernize our legacy platform

8. 8 Remove Single point of failure

9. 9 Deliver Software Faster

10. 10 Mental models Business Complexity Maintainability Performance

11. 11 Evolving to microservices

12. DEFINITION MARKETING Organizations which design systems ... are constrained to produce designs which are copies of the communication structures of these organizations. - Melvin Conway, 1968 12 Conway's Law

13. 13

14. How small is a microservice? 14

15. Identify Core domains 15 Core Domain Supporting Domain Generic Domain Buy/Outsourced Parity

16. 16 Tactical approach to an individual microservice

17. 17 Monolith

18. 18 Decoupling the Monolithic

19. Refactor the ball of mud application PRESENTATIONLAYER BUSINESS LAYER DATA LAYER 19

20. Strangler Pattern 20 All Old users Starting position users Early days users Half way users Nearly finished users All NEW finished • Make something new that obsoletes a small percentage of something old. • Put them live together. • Rinse and repeat.

21. Anti-corruption layer Prevent legacy system from polluting your pristine new code. 21 Old system Request router New Service Anti-corruption Layer Request

22. 22 1 Multiple databases Complexity of deploying and operating a distributed system2 Eventual consistency3 Drawbacks of a microservices architecture

23. Data Quality 23 Data has no meaning without context - Create new table New requirement - Add new column - Transform data

24. Gateway USERS API Gateway External Systems Session Management routing security 24

25. Data Consistency Published eventEvent Store (pub/sub) Eventually Consistent 25

26. Servicecomponent Module1 Modulen API Gateway client request client request client request session management Event Store (pub/sub) OLAP Reporting Business Intelligence Data Warehouse Enterprise Security Servicecomponent Module1 Modulen Servicecomponent Module1 Modulen Servicecomponent Module1 Modulen Servicecomponent Module1 Modulen 26

27. 27 demo

28. 28 Event Store Edge Gateway users UI Command Service HTTPGET HTTPPOST/PUT PUBLISHEVENTS CRUD Event Processor SUBSCRIBETO EVENTS CREATE/READ Microservice A Single Microservice

29. 29 Tools

30. Questions? 30 Facebook.com/Healthesystems twitter.com/healthesystems linkedin.com/company/healthesystems youtube.com/healthesystems

Journey to microservices

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