It might make sense to use a simple CRC ckecksum here rather than a cryptographic hash -- faster to calculate, and fewer characters to add to the page. On Jan 13, 2013 7:18 AM, "Bob Harner" <[email protected]> wrote:
> I like the plan a lot. I don't think the size is much concern. Thousands > of small ints in a map don't add up to much memory if the map is shared > application-wide and not per-session. > On Jan 12, 2013 11:31 PM, "Kalle Korhonen" <[email protected]> > wrote: > >> On Sat, Jan 12, 2013 at 5:57 PM, Howard Lewis Ship <[email protected]> >> wrote: >> >> > I'm part of the way through CSS aggregation and I've got the code that >> > handles URL rewriting inside CSS files. >> > At this point, I can see changing the version number incorporated into >> > /asset URLs to be per-asset, rather than the application version number; >> > the version number would be a MD5 or SHA1 hash of the (uncompressed) >> > content of the file. >> > >> >> Presumably you'd calculate the hash on first access to the asset? Would >> you >> keep the hash memory for subsequent request? That's potentially a lot of >> small items to be kept in memory. I still think that the easiest option >> would be to use a module specific version - if module supplies one, you >> use >> that (and only that), otherwise the application version. >> >> Kalle >> >> >> >> > This would be great, as it means that an upgrade of the application to a >> > new deployment, with a proper new application version number, would NOT >> > invalidate the vast majority of assets: those assets that have not >> changed >> > will maintain a consistent URL, and likely be already cached in >> end-user's >> > browsers. >> > >> > Unfortunately, I have yet to come up with a reasonable way to accomplish >> > the same thing for AMD modules ... but I'm working on it. >> > >> > -- >> > Howard M. Lewis Ship >> > >> > Creator of Apache Tapestry >> > >> > The source for Tapestry training, mentoring and support. Contact me to >> > learn how I can get you up and productive in Tapestry fast! >> > >> > (971) 678-5210 >> > http://howardlewisship.com >> > >> >
