Voyage - PharoConf 2012
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The document discusses Voyage, a persistence layer for Pharo/Squeak that provides a common API and centralized management for saving and retrieving complex object models from various backends such as memory and MongoDB. It provides services like caching live objects, error handling, and reconnection. The API includes methods like #save, #remove, #selectAll. Voyage uses Magritte for object mapping and serialization. Initial versions work but need more optimization and cleanup. Future work includes supporting additional backends and collaborators.
![A simple API
? #save:
Where
clauses are what
the back-end needs,
? #remove: no something
intermediate
? #removeAll:
? #selectAll: Memory:
[ :each | each key = 42 ]
? #selectMany:where:
? #selectOne:where:
Wednesday, June 27, 12](https://image.slidesharecdn.com/pharoconf12-voyage-120627040111-phpapp02/85/Voyage-PharoConf-2012-17-320.jpg)
![A simple API
? #save:
Where
clauses are what
the back-end needs,
? #remove: no something
intermediate
? #removeAll:
? #selectAll: Memory:
[ :each | each key = 42 ]
? #selectMany:where:
? #selectOne:where: Mongo:
{ #key->42 } asDictionary
Wednesday, June 27, 12](https://image.slidesharecdn.com/pharoconf12-voyage-120627040111-phpapp02/85/Voyage-PharoConf-2012-18-320.jpg)
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Voyage - PharoConf 2012
- 1. Voyage The adventure of persisting object-models Wednesday, June 27, 12
- 2. A glimpse of Seaside ? Stateful ? Component model ? Maybe aged, but still the best :) Wednesday, June 27, 12
- 3. Continuations I still prefer: Wednesday, June 27, 12
- 4. Continuations Over: Wednesday, June 27, 12
- 5. A glimpse of Pier ? A CMS ? Component based ? You can embed almost anything ? You can decorate almost anything Wednesday, June 27, 12
- 6. A perfect world Wednesday, June 27, 12
- 7. A perfect world ? Objects collaborate inside your image, creating a perfect choreography of interacting elements... Wednesday, June 27, 12
- 8. A perfect world ? Objects collaborate inside your image, creating a perfect choreography of interacting elements... ? INSIDE your image Wednesday, June 27, 12
- 9. Why to persist? ? Space ? Reliability ? Scalability Wednesday, June 27, 12
- 10. Persisting Pier ? A complex* object model ? Looking for ? Scalability ? Update capabilities ? Backup *And I mean really complex: take a look to all those commands, decorations and dictionaries :) Wednesday, June 27, 12
- 11. Show time! Wednesday, June 27, 12
- 12. Voyage ? A ¡°non-abstract¡± persistence layer ? An ¡°implementation pattern¡± which provides some services as well Wednesday, June 27, 12
- 13. A simple layered approach Voyage Memory Mongo ... Magritte- MongoTalk Mongo Wednesday, June 27, 12
- 14. Use cases Singleton mode: Regular mode: Wednesday, June 27, 12
- 15. A simple API ? #save: ? #remove: ? #removeAll: ? #selectAll: ? #selectMany:where: ? #selectOne:where: Wednesday, June 27, 12
- 16. A simple API ? #save: Where clauses are what the back-end needs, ? #remove: no something intermediate ? #removeAll: ? #selectAll: ? #selectMany:where: ? #selectOne:where: Wednesday, June 27, 12
- 17. A simple API ? #save: Where clauses are what the back-end needs, ? #remove: no something intermediate ? #removeAll: ? #selectAll: Memory: [ :each | each key = 42 ] ? #selectMany:where: ? #selectOne:where: Wednesday, June 27, 12
- 18. A simple API ? #save: Where clauses are what the back-end needs, ? #remove: no something intermediate ? #removeAll: ? #selectAll: Memory: [ :each | each key = 42 ] ? #selectMany:where: ? #selectOne:where: Mongo: { #key->42 } asDictionary Wednesday, June 27, 12
- 19. What Voyage provides ? Common API ? Centralized management - Preserve identity (caching live objects) - Error handling - Reconnection - Pluggable connection pool Wednesday, June 27, 12
- 20. Voyage-Memory ? Is just a centralized dictionary of collections. ? Used for prototyping and early stages of development (no need to choose a persistent repository at ?rst instance) ? Works for ¡°stateless¡± applications which need readonly data (I made one once, yes) Wednesday, June 27, 12
- 21. Voyage-Mongo ? Uses MongoTalk ? Adds - Object cache - Error handling/reconnection - Transparent mapping (magritte guided) Wednesday, June 27, 12
- 22. Magritte-Mongo ? ¡°Object-Document mapper¡± ? Magritte base implementation is intended to UI and there is some difference with mongo needs. - Explicit (static) declaration vs. dynamic type inference. (i.e. Pier persistence is nearly impossible with an explicit declaration approach) ? I changed it a lot since Norbert saw him (more and more inference... and still needs more) Wednesday, June 27, 12
- 26. Serializer ? Uses become, so yes, it is slow ? So far, no need more speed. ? Other possible approaches: Two phases (mark and persist) Wednesday, June 27, 12
- 27. Status ?First version working (make it work) ? Need cleanup (make it right) ? Need some optimization (make it fast) Wednesday, June 27, 12
- 28. Future ? Finish it (collaborators would be ?ne :) ? Add/Update some backends (Just if/when needed) - Fuel - Phriak - Glorp? Wednesday, June 27, 12
- 29. Thanks! Voyage and PierVoyage are available at: http://smalltalkhub.com/#!/~estebanlm/Voyage Already a tester who is blogging about! http://articles.tulipemoutarde.be/ Wednesday, June 27, 12