Add Factory for ContentItems and Blobs
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Key: STANBOL-573
URL: https://issues.apache.org/jira/browse/STANBOL-573
Project: Stanbol
Issue Type: New Feature
Components: Enhancer
Reporter: Rupert Westenthaler
Assignee: Rupert Westenthaler
Currently the used implementation for ContentItems/Blobs is hardcoded for the
Stanbol Enhancer. The same is true for other components that do use the Java
API of the Enhancer (e.g. the Contenthub).
The introduction of a ContentItemFactory that registers itself as OSGI service
would allow to change the used implementation based on a configuration.
A simple usage scenario where this would make sense in the enhancement of big
media files. Currently those files are kept in-memory, because thats the way
how the currently used InMemoryContentItem/InMemoryBlob implementation works.
While having the data in memory is best suited for typically enhancement
requests (small to medium sized textual content) this might become troublesome
for users that whant to extract and enhance metadata from media files (e.g. ID3
tags from MP3 or Exif metadata from TIF images). The facrory pattern would
allow to configure a ContentItem/Blob implementation that keeps the parsed
content in temporary files.
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