On Saturday, March 16, 2013, Bob Harner wrote: > Howard, > > If I'm reading the code correctly, you're using MD5 for the asset > checksums. Since MD5 is a cryptographic hashing algorithm, it is in a > sense "designed to be slow". But in the case of asset URLs and E-Tags, > I don't think there is any need for cryptography. Most non-crypto > hashing would be much faster, and the performance difference might be > large for large assets, or a large number of them. > > http://docs.oracle.com/javase/6/docs/api/java/util/zip/Adler32.html > > Although fast-but-unreliable" checksums like Adler32 are not > recommended for most purposes, for the small number of hashes each > asset will see over its lifetime they seem like a perfect match for > the job here.
Sounds like a fine idea ... Speed isn't an issue, but every bit of CPU counts. > > On Thu, Mar 14, 2013 at 7:54 PM, Howard Lewis Ship > <[email protected]<javascript:;>> > wrote: > > Just committed a bunch, most everything is in place. > > > > I had to do a lot of work to keep any semblance of backwards > compatibility. > > I'm concerned that I may have affected some performance (but probably in > > an imperceptable way). > > > > Still have to add E-Tags support all assets (including modules), and > remove > > far-future expires headers for modules. > > > > I'm very happy with how this is coming out; having "perfect" asset URLs > is > > going to be very nice for any kind of deployment whether large or small. > > > > -- > > 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 > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] <javascript:;> > For additional commands, e-mail: [email protected]<javascript:;> > > -- 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
