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Accion labs microservices white paper
- 2. Agenda ● Evolution of application infrastructure ● Web application architecture models ● What is a microservice? ● How are microservices utilized? ● A case study
- 4. Mainframe PCs & Servers Web Cloud App UI DB Monolithic Client Server UI DB Client Server App UI DB N-Tier UI App DB App DB App DB App DB App DB App DB Service Oriented InfrastructureApplications
- 6. Monolithic ● Tightly coupled components ● Large codebase ● Difficult to change ● Long release cycles ● Waterfall development Highly sensitive to errors Normalized data models Single technology stack Large development teams Expensive to scale infrastructure ● ● ● ● ● Architecture
- 7. Application Web Browser Users Manager Products Manager Inventory Manager Orders Manager Users Products Inventory Orders Components Libraries of reusable code Inter-component communication In-process calls Orchestration Application Logic Interface Definitions Code documentation Technology Stack Single application platform Persistence, Data Management, Data Models, Consistency Centralized Persistence, Single Database, Unified Data Model, Transactional Consistency
- 8. ● Tightly coupled services ● Partitioned codebase ● Easier to change ● Shorter release cycles ● Iterative development Less sensitive to errors Normalized data models Single technology stack Several smaller development teams Cheaper to scale infrastructure ● ● ● ● ● Service Oriented Architecture
- 9. Web App Users Products Inventory Orders Components Independently deployed services Inter-component communication Tightly coupled Messages Orchestration Service Bus Interface Definitions Discoverable, provider contracts Technology Stack Disparate application platforms Persistence, Data Management, Data Models, Consistency Centralized Persistence, Single Database, Unified Data Model, Transactional Consistency Users Manager Products Manager Inventory Manager Orders Manager Service Bus
- 10. ● Loosely coupled services ● Small codebase per service ● Built for change ● Short release cycles ● Iterative development Resilient to errors Denormalized data model Multiple technology stacks Several small development teams Cheaper to scale infrastructure ● ● ● ● ● Microservices Architecture
- 12. Small Service ● Provides one or more RESTful API endpoints ● All APIs are related to a single functional domain or entity ● APIs generalized for covering maximum use cases ● Code size small enough for a single SCRUM team to own and manage Users Manager Products Manager Inventory Manager Orders Manager
- 13. Independent Service ● Functional Independence: Not dependant on any other microservice ● Data Independence: Owns its data entities ● Technology Independence: Uses tech stack that is best suited ● Denormalized: Keeps a copy of all data required for its functioning Users Manager Products Manager Inventory Manager Orders Manager Users DB Products DB Inventory DB Orders DB
- 14. Event Aware Service ● Publishes all significant events that occur in its domain or entity ● Subscribes to all dependent events that affect its domain or entities ● Able to regenerate all its data by replaying past events Users Manager Products Manager Inventory Manager Orders Manager Users DB Products DB Inventory DB Orders DB Events Store/Queue
- 15. Extensible, Expendable Service ● Multiple instances of the same service can coexist ● New version of a service can be tested along with an old version ● Other services are not affected by changes in one service Events Store/Queue Users Manager ver 1.1 Users DB ver 1.1 Users Manager ver 1.0 Users DB ver 1.0 Inventory Manager Inventory DB Orders Manager Orders DB Products Manager Products DB
- 17. Responsive UI Applications Web UI App Mobile UI App Generalized APIs Users Manager Products Manager Inventory Manager Orders Manager Users DB Products DB Inventory DB Orders DB Events Store/Queue
- 18. API Gateway Web UI App Mobile UI App Generalized APIs Users Manager Products Manager Inventory Manager Orders Manager Users DB Products DB Inventory DB Orders DB Events Store/Queue API Gateway UI Optimized APIs
- 19. Monolithic Architecture Service Oriented Architecture Microservices Architecture Components Libraries of reusable code Independently deployed services Services of reusable applications Inter-component communication In-process calls Tightly coupled Messages Publish-Subscribe Events Orchestration Application Logic Service Bus Event Queue Interface Definitions Code documentation Discoverable, provider contracts Discoverable, consumer-driven contracts Technology Stack Single application platform Disparate application platforms Independent applications Persistence, Data Management, Data Models, Consistency Centralized Persistence, Single Database, Unified Data Model, Transactional Consistency Centralized Persistence, Single Database, Unified Data Model, Transactional Consistency Polyglot Persistence, Multiple Databases, Domain-driven Bounded Contexts, Eventual Consistency Comparison Chart
- 21. Patent Research Application Dashboards Users Manager Customers Manager Workflow Manager Collaboration Engine Users Customers Intranet Customer Portal Admin Panel Projects Manager Documents Manager Search Engine Analytics Engine Projects Documents Workflows Discussions FTS Index Analytics Data Legacy Architecture
- 23. Reengineered Architecture Workflow Manager Workflows DB Collaboration Engine Discussions DB Full Text Search Engine Search DB Analytics Engine Analytics DB Users Manager Users DB Customers Manager Customers DB Projects Manager Projects DB Documents Manager Documents DB Events Store/Queue API Gateway Dashboards Intranet Customer Portal Admin Panel
- 24. Technology Stack Workflow Manager MongoDB Collaboration Engine MongoDB Full Text Search Engine Elastic Search Analytics Engine Cassandra Users Manager MariaDB Customers Manager MariaDB Projects Manager MariaDB Documents Manager MongoDB Apache Kafka NodeJS HTML5, CSS, JS Bootstrap AngularJS D3JS AmazonWebServices