Improve transformer service
---------------------------
Key: NXP-2851
URL: http://jira.nuxeo.org/browse/NXP-2851
Project: Nuxeo Enterprise Platform
Issue Type: User story
Reporter: Thierry Delprat
Assignee: Thierry Delprat
Priority: Major
Fix For: 5.2 M4
Dev Story :
=======
New transformers :
-------------------------
There are pleinty of command line tools that can be used to handle
transformations.
I would to have a easy and possibily cross platform way to integrate these
third party tools as Nuxeo transformers.
Tranform blobs and Documents :
------------------------------------------
API should expose an API to handle transformation from a DocumentModel.
Event is reading blob from a DocumentModel is not the only use case, this is a
main use case.
Cache management :
----------------------------
I don't want to handle cache "by hand" at application level. Transformation
service should deal with that.
Implementation Notes :
==============
New transformers plugins :
----------------------------------
Some addons inlcude dedicated transformers :
- Any2Html for HTML preview
- Picture transformers for PictureBook and Tiling
- Base class for CommandLine based transformers
- Zip2Text
=> generic transformers should be part of global plugins
- this will improve the default transformers set
- this will make configuration more centralized
Cache management :
----------------------------
New Addons working with transformers have to handle caching.
This caching is handled at application level.
=> This would be far mor efficient to have a cache management at transformer
level
==> This requires some improvement of Transformer API
- input API should contain needed information to generate a cache key
- input API should contain a way to ask for cache invalidation (ie : fresh
transform)
- output API should include API about cache status
API :
------
Titling include a ImageResource API for wrapping a Blob or a Blob in a
DocumentModel.
This includes cache key management.
We should leverage this to make a TransformerResource.
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