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Voyage
The adventure of persisting object-models
Wednesday, May 30, 12
A glimpse of Seaside
- Stateful
- Component model
- Maybe aged, but still the best :)
Wednesday, May 30, 12
Voyage The adventure of persisting object-models Wednesday, May 30, - - PowerPoint PPT Presentation
Voyage The adventure of persisting object-models Wednesday, May 30, - - PowerPoint PPT Presentation
Voyage The adventure of persisting object-models Wednesday, May 30, 12 A glimpse of Seaside Stateful Component model Maybe aged, but still the best :) Wednesday, May 30, 12 Continuations I still prefer: Wednesday, May 30, 12
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Continuations
I still prefer:
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SLIDE 4
Continuations
Over:
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A glimpse of Pier
- A CMS
- Component based
- You can embed almost anything
- You can decorate almost anything
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A perfect world
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A perfect world
- Objects collaborate inside your image,
creating a perfect choreography of interacting elements...
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A perfect world
- Objects collaborate inside your image,
creating a perfect choreography of interacting elements...
- INSIDE your image
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Why to persist?
- Space
- Reliability
- Scalability
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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 :)
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Show time!
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Voyage
- A “non-abstract” persistence layer
- An “implementation pattern” which
provides some services as well
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A simple layered approach
Voyage Memory Mongo ... MongoTalk Magritte- Mongo
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Use cases
Singleton mode: Regular mode:
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A simple API
- #save:
- #remove:
- #removeAll:
- #selectAll:
- #selectMany:where:
- #selectOne:where:
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A simple API
- #save:
- #remove:
- #removeAll:
- #selectAll:
- #selectMany:where:
- #selectOne:where:
Where clauses are what the back-end needs, no something intermediate
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A simple API
- #save:
- #remove:
- #removeAll:
- #selectAll:
- #selectMany:where:
- #selectOne:where:
Where clauses are what the back-end needs, no something intermediate Memory: [ :each | each key = 42 ]
Wednesday, May 30, 12
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A simple API
- #save:
- #remove:
- #removeAll:
- #selectAll:
- #selectMany:where:
- #selectOne:where:
Where clauses are what the back-end needs, no something intermediate Memory: [ :each | each key = 42 ] Mongo: { #key->42 } asDictionary
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What Voyage provides
- Common API
- Centralized management
- Preserve identity (caching live objects)
- Error handling
- Reconnection
- Pluggable connection pool
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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 first instance)
- Works for “stateless” applications which
need readonly data (I made one once, yes)
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Voyage-Mongo
- Uses MongoTalk
- Adds
- Object cache
- Error handling/reconnection
- Transparent mapping (magritte guided)
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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)
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Serializer
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Serializer
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Serializer
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Serializer
- Uses become, so yes, it is slow
- So far, no need more speed.
- Other possible approaches: Two phases
(mark and persist)
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Status
✓First version working (make it work)
- Need cleanup (make it right)
- Need some optimization (make it fast)
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Future
- Finish it (collaborators would be fine :)
- Add/Update some backends (Just if/when
needed)
- Fuel
- Phriak
- Glorp?
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Voyage and PierVoyage are available at: http://smalltalkhub.com/#!/~estebanlm/Voyage
Thanks!
Already a tester who is blogging about! http://articles.tulipemoutarde.be/
Wednesday, May 30, 12