Re: CAS and Django cache

2011-10-27 Thread Tom Evans
On Wed, Oct 26, 2011 at 11:29 PM, dmitry b wrote: > Can I do check-and-set operations using Django's cache api? > > > Thanks > D. > Memcached reuse existing terminology and then complain that this causes confusion. Their CAS stands for 'compare and set', rather than the 'compare and swap' that yo

Re: CAS and Django cache

2011-10-27 Thread Malcolm Box
Yes, get followed by set can lead to data loss. What you want is cache.add(). This sets the value if and only if there is no existing value. Its atomic on backends that support it - notably memcached. Sent from my iPhone, please excuse any typos On 27 Oct 2011, at 07:26, Dan Julius wrote:

Re: CAS and Django cache

2011-10-26 Thread Dan Julius
Couldn't that potentially overwrite a value set by a different thread? Dan On Thu, Oct 27, 2011 at 7:13 AM, Kurtis Mullins wrote: > umm, I'm not sure if "check-and-set" is some cache-specific lingo or not. > But if you want to see if a value isn't set, check to see if it's None > type... example

Re: CAS and Django cache

2011-10-26 Thread Kurtis Mullins
umm, I'm not sure if "check-and-set" is some cache-specific lingo or not. But if you want to see if a value isn't set, check to see if it's None type... example: if cache.get('key') is None: cache.set('key', 'value', cache_seconds) Sorry if that's not at all what you're talking about :) On W

CAS and Django cache

2011-10-26 Thread dmitry b
Can I do check-and-set operations using Django's cache api? Thanks D. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-use