Lukáš Fryč created RF-13514:
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Summary: Support file upload progress tracking in Servlets >= 3.0
environment
Key: RF-13514
URL: https://issues.jboss.org/browse/RF-13514
Project: RichFaces
Issue Type: Enhancement
Security Level: Public (Everyone can see)
Components: component-input, core
Affects Versions: 5.0.0.Alpha3
Reporter: Lukáš Fryč
We currently support two approaches for file upload:
* Servlets 2.5: own request form data parser
[{{MultipartRequestParser}}|https://github.com/richfaces/richfaces/blob/master/framework/src/main/java/org/richfaces/request/MultipartRequestParser.java]
* Servlets 3.0: leveraging {{HttpServletRequest#getParts()}}
However as we have discussed RF-13444, we had to finally do a trade-off of
limiting support of file progress tracking. I.e. in Servlets 3.0 we have no
simple way how to track file upload progress since getParts() returns data for
completed request.
There are several possible outcomes:
1) drop server-side file upload progress tracking and leverage XHR2/HTML5 that
has built-in ability to track progress
* imho we are already prepared to switch to XHR2 and client-side progress
(possibly leveraging some third-party widget) since [all major browsers support
it at least one version back|http://caniuse.com/#feat=xhr2]
* existing implementation:
http://www.script-tutorials.com/pure-html5-file-upload/
2) use a {{ServletFilter}} to wrap a request as our
{{FileUploadFacesContextFactory}} currently do and so have an earlier access to
the request object
* this principle has a drawback - we have to ensure our filter has high-enough
priority so the servlet container won't touch the request body yet
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