Moduarlity patterns with OSGi
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The document discusses modularity patterns using OSGi, focusing on microservices architecture, patterns such as the whiteboard and extender patterns, and real-world examples. It emphasizes the importance of service registries, managing service configurations, and the need for maintainability and extensibility in modular architectures. Additionally, it critiques the overuse of certain patterns and suggests best practices for utilizing OSGi effectively.
Moduarlity patterns with OSGi
- 1. Modularity patterns with OSGi
- 3. Agenda ÎŒServices architecture Whiteboard pattern Reusable and configurable services Extender pattern Real world example
- 6. Module Service contract Implementation classes
- 8. Make imports and exports explicit Export only public interfaces Import public interfaces provided by others Export-Package: example.api;version=â1.0.0" Import-Package: some.otherapi;version=â[1.0,2)"
- 10. OSGi Service Registry Service Registry Bundle registering a service Bundle using a service Publish MyInterface Lookup MyInterface
- 11. Demo
- 12. Components only communicate using service APIs Implementation should be replaceable! A simple example Results REST Results Storage Stats REST Stats Aggregator Tracks REST Tracks Storage Services may use multiple other services
- 13. Demo
- 14. Always be prepared for dynamics
- 15. Services must contain their own data Results Storage Tracks Storage
- 16. Examples MongoDB Each service owns a collection Relational Each service owns a set of tables Results Storage Tracks Storage ... ... Ta b l e A ... ... Ta b le B ... ... Ta b l e C ... ... Ta b le D ... ... Ta b le F ... ... Ta bl e E ... ... Ta b le G
- 18. Plugin Registry Plugin Plugin Plugin Whiteboard Use multiple services with the same inter face
- 19. Demo
- 20. Real life examples Amdatu REST Apache Felix HTTP Whiteboard Amdatu Scheduling Amdatu Bootstrap plugins Apache Felix Gogo commands
- 21. Configuration
- 22. What if all services do the same thing with different config?
- 23. Managed Service Factory Config Config Config Component Component Component Managed Service Factor y
- 24. Extender Pattern
- 25. Real life examples Providing static web resources Amdatu JPA (weaving) Templates in Amdatu Bootstrap What if my bundles donât really âdoâ anything?
- 26. Resource bundle A Resource bundle B Extender Component Component Component Extender pattern
- 27. Demo
- 28. Do NOT overuse Adding extenders is like adding a DSL: Powerful and confusing.
- 29. Bootstrap Core Amdatu Plugin Dependency Manager Plugin Project Plugin Workspace Plugin Baselining Plugin Bootstrap Web backend Bootstrap Shell Template Extender Project templates Workspace templates Bootstrap Web UI bnd Plugin Whiteboard ... Plugin R eal world example Bootstrap
- 30. Wrap up A modular architecture gives us: Maintainability Extensibility Freedom to change
- 31. But what if I want Spring EJB âŠ? Just donât⊠You really donât need to.
- 32. Eclipse OSGi plugin http://bndtools.org/ Open source OSGi components http://www.amdatu.org/ Amdatu Thatâs us http://luminis-technologies. com Paul Bakker paul.bakker@luminis.eu @pbakker