![DEFINITION
• No concret definition.
• Microservices is not SOA
• Microservices is an architecture style
• Large complex software applications are composed of
[1..n] Small services
• Each of them complets one task
• Each task represent a small business capability
• Bounded context
26/05/2016 Sqli Group 11](https://image.slidesharecdn.com/microservicesarchitecture-160601003425/85/Microservices-architecture-11-320.jpg)
Microservices architecture
- 2. ABOUT ME • Senior Software Developer at Sqli Group Rabat Morocco • JAVA / OCEJWCD & HYBRIS certified • I worked in many E-Commerce projects based on SAP Hybris Platform • @abdelghaniazri 26/05/2016 Sqli Group 2
- 3. SUMMARY • INTRODCUTION & HISTORY • WHAT IS MICROSERVICES ARCHITECTURE? • CHARACTERISTICS OF MICROSERVICES • BENEFITS OF MICROSERVICES • REQUIREMENTS FOR MICROSERVICES • WHO HAS USE THEM ? • MICROSERVICES PATTERNS • FRAMEWORKS FOR MICROSERVICES • BUILDING MICROSERVICES ARCHITECTURE • DEMO • REFERENCES 26/05/2016 Sqli Group 3
- 5. MONOLITHICAL VS MICROSERVICES 26/05/2016 Sqli Group 5 Source: Martin Fowler blog
- 6. MONOLITHICALAPPLICATIONS • The term Monolothic Used by Unix community and appears first time in The Art of Unix Programming • It describe a big application • Single-tiered software application in which the user interface and data access code are combined into a single program from a single platform. (Wikipedia) 26/05/2016 Sqli Group 6
- 7. MONOLITHICALAPPROACH PROS • Single codebase • Easy to develop/debug/deploy • Good IDE support • Easy to scale • A Central Ops team can efficiently handle 26/05/2016 Sqli Group 7
- 8. MONOLITHICALAPPROACH DRAWBACKS • Large Codebase • Many Components, no clear ownership • Long deployment cycles • As codebase increases … • Tends to increase “tight coupling” between components • All components have to be coded in the same language 26/05/2016 Sqli Group 8
- 9. MONOLITHICALAPPROACH EVOLUTIONS User Accounts Shopping Cart Product Catalog Customer Service 26/05/2016 Sqli Group 9 Source: http://fr.slideshare.net/stonse/microservices-at-netflix
- 10. HISTORY • The term « microservice » appeared firstly in 2011 in software architecture workshop near Venice • In Mai 2012: “Java, the Unix Way” at 33rd degree by James Lewis • September 2012: “μService Architecture“ at Baruco by Fred George • Adrian Cockroft at Netflix« FINE GRAINED SERVICES » Source: http://martinfowler.com/articles/microservices.html#footnote-etymology 26/05/2016 Sqli Group 10
- 11. DEFINITION • No concret definition. • Microservices is not SOA • Microservices is an architecture style • Large complex software applications are composed of [1..n] Small services • Each of them complets one task • Each task represent a small business capability • Bounded context 26/05/2016 Sqli Group 11
- 12. MICROSERVICES APPLICATION Source: IBM Redbooks Microservices from Theory to Practice 26/05/2016 Sqli Group 12
- 13. COMPARISON MONOLITHICAL VS MICROSERVICES Category Monolithic architecture Microservices architecture Code Single code base Multiple code base. Each microservice has its own code base Understandability Often confusing and hard to understand Much better readability And easier to maintain Deployment Complex deployments with maintenance windows and scheduled downtimes. Simple deployment as each microservice can be deployed individually, with minimal if not zero downtime. Language Typically entirely developed in one programming language. Each microservice can be developed in a different programming language. Scaling Requires you to scale the entire application even though bottlenecks are localized. Enables you to scale bottle-necked services without scaling the entire application. 26/05/2016 Sqli Group 13
- 14. OPERATIONAL REQUIREMENTS FOR MICROSERVICES • DOMAIN DRIVEN DESIGN • Eric Evans’ DDD approach • Anemic domain model = database tables mapped to objects. No behavior • Rich domain model = a collection of objects that expose behavior 26/05/2016 Sqli Group 14
- 15. OPERATIONAL REQUIREMENTS FOR MICROSERVICES • SINGLE RESPONSIBILITY PRINCIPLE • Each service is responsible for a single part of the functionnality and does it well 26/05/2016 Sqli Group 15
- 16. OPERATIONAL REQUIREMENTS FOR MICROSERVICES • EXPLICITY PUBLISHED INTERFACE • A producer service publishes an interface that is used by a consumer service 26/05/2016 Sqli Group 16
- 17. OPERATIONAL REQUIREMENTS FOR MICROSERVICES • INDEPENDENT DURS • DEPLOY,UPDATE,REPLACE,SCALE • Each service can be independently deployed, updated, replaced and scaled 26/05/2016 Sqli Group 17
- 18. OPERATIONAL REQUIREMENTS FOR MICROSERVICES • LIGHT WEIGHT COMMUNICATION • REST over HTTP • STOMP over WebSocket • Other similar lightweight are used for communication between services 26/05/2016 Sqli Group 18
- 19. OPERATIONAL REQUIREMENTS FOR MICROSERVICES • DECENTRALIZED DATA MANAGEMENT • PRODUCTS NOT PROJECTS • INFRASTRUCTURE AUTOMATION 26/05/2016 Sqli Group 19
- 20. BENEFITS OF MICROSERVICES • INDEPENDENT SCALING • Each microservice can scale independently • INDEPENDENT UPGRADES • Each microservice can deployed independently • Teams are independent • EASY MAINTENANCE • Each microservice does one feature : code more readable • POTENTIAL HETEROGENEITY AND POLYGLOTISM • Teams may have # platform, language • FAILURE AND RESOURCE ISOLATION • If one service crash, it will not affect the rest of application • IMPROVED COMMUNICATION ACROSS TEAMS • Membres of domain work in single team 26/05/2016 Sqli Group 20
- 21. OPERATIONAL REQUIREMENTS FOR MICROSERVICES • SERVICE REPLICATION • SERVICE DISCOVERY • SERVICE MONITORING • RESILIENCY • DEVOPS 26/05/2016 Sqli Group 21
- 22. MICROSERVICES PATTERNS • Aggregator: Results from multiple microservices are aggregated into one composite microservice. 26/05/2016 Sqli Group 22 Source dzone.com
- 23. MICROSERVICES PATTERNS • Proxy: The Proxy microservice design pattern is a variation of the Aggregator. In this case, aggregation does not need to happen client-side. Rather, a different microservice may be invoked as required by the business logic. 26/05/2016 Sqli Group 23
- 24. MICROSERVICES PATTERNS • Chained: single consolidated response to a request 26/05/2016 Sqli Group 24
- 25. MICROSERVICES PATTERNS • Branch: Service A either a web page or a composite microservice may invoke two different chains concurrently 26/05/2016 Sqli Group 25
- 26. MICROSERVICES PATTERNS • Shared Resources: • the service is full-stack and has control of all the components UI, middleware, persistence, transactions. This allows the service to be polyglot, so the right tool can be used for the right job 26/05/2016 Sqli Group 26
- 27. MICROSERVICES PATTERNS • Asynch Messaging: Since Rest is synchronous, Some services elect to use message queues instead of REST: RabbitMQ, ActiveMQ… 26/05/2016 Sqli Group 27
- 28. WHO HAS USE THEM ? • Great success in some big systems • ThoughtWorks • Netflix • Amazon • REA Group • Soundcloud • eBay • Google • … 26/05/2016 Sqli Group 28
- 29. JAVA FRAMEWORKS FOR MICROSERVICES • Spring Boot • Dropwizard • Jersey • Ninja Web Framework • Play Framework • RestExpress • Restlet • Restx • Spark Framework • … 26/05/2016 Sqli Group 29
- 30. OTHER FRAMEWORKS • Flask (python) • Sinatra (Ruby) • Vert.x (Polyglotte) • Service Fabric (DOT NET) 26/05/2016 Sqli Group 30
- 31. BUILDING MICROSERVICES ARCHITECTURE • Conway’s law • Invented by the computer programmer M. Conway's in 1967 • organizations which design systems ... are constrained to produce designs which are copies of the communication structures of these organizations 26/05/2016 Sqli Group 31
- 32. BUILDING MICROSERVICES ARCHITECTURE • Dependency services Your App/Service Service A Service B Service C Service X Service Y 26/05/2016 Sqli Group 32
- 33. BUILDING MICROSERVICES ARCHITECTURE • Server caching for hight availability Your App/Service Service X Service Y Service Z Cache ClusterCache Cluster 26/05/2016 Sqli Group 33
- 34. BUILDING MICROSERVICES ARCHITECTURE • Homogeneity in a Polyglot Ecosystem 26/05/2016 Sqli Group 34 Source: http://fr.slideshare.net/stonse/microservices-at-netflix
- 35. BUILDING MICROSERVICES ARCHITECTURE Account Service Product Service Cart Service Order Service Account DB Product DB Cart DB Order DB Online Shopping Service 26/05/2016 Sqli Group 35 Online shop Order DBAccount DB Example from microservices with spring spring.io
- 36. BUILDING MICROSERVICES ARCHITECTURE 26/05/2016 Sqli Group 36 Online shop
- 37. BUILDING MICROSERVICES ARCHITECTURE • Service Registration 26/05/2016 Sqli Group 37
- 38. BUILDING MICROSERVICES ARCHITECTURE • Add spring boot to pom 26/05/2016 Sqli Group 38
- 39. BUILDING MICROSERVICES ARCHITECTURE • Add Spring Cloud to pom 26/05/2016 Sqli Group 39
- 40. BUILDING MICROSERVICES ARCHITECTURE • Registration configuration 26/05/2016 Sqli Group 40
- 41. BUILDING MICROSERVICES ARCHITECTURE • Creating a Microservice: Account-Service 26/05/2016 Sqli Group 41
- 42. BUILDING MICROSERVICES ARCHITECTURE • Creating a Microservice: Account-Service 26/05/2016 Sqli Group 42
- 43. BUILD MICROSERVICES ARCHITECTURE • Encapsulating WebAccountService Access 26/05/2016 Sqli Group 43
- 44. DEMO Demo Spring Boot 26/05/2016 Sqli Group 44
- 45. SUMMARY • Microservices: functional decomposition of systems into manageable and independently deployable services • Microservices is not SOA • Microservices can be seen as “SOA – the good parts” • Will microservices help me ?? • Domain modeling, boundaries, runtime dependencies, loose coupling & culture/organizational structure • Microservice architectures means • Independence in code, technology, scaling, evolution • Using battle-tested infrastructure (HTTP, JSON, REST) 26/05/2016 Sqli Group 45
- 46. REFERENCES • Sites: • http://martinfowler.com/articles/microservices.html • http://2012.33degree.org/talk/show/67 • http://www.melconway.com/Home/Committees_Paper.html • http://martinfowler.com/microservices/ • http://martinfowler.com/articles/microservice-testing/#testing- component-introduction • http://blog.inovia-conseil.fr/?p=155 • http://blog.xebia.fr/2015/03/02/microservices-les-concepts/ • https://spring.io/blog/2015/07/14/microservices-with-spring • Ebooks: 26/05/2016 Sqli Group 46