caching

问题 I just want to know what is distributed Atomic lock means in caches drivers? 回答1: Distributed locks are well documented, in multiple sources. The atomic attribute refers to the indivisible test-and-set that should be part of the lock request. Otherwise, two contenders may test at the same time, and then both set and walk away thinking they got exclusivity on the resource. Since it is a must, you often find the term simply as distributed lock . Now, some sources: Antirez (Redis creator)

问题 I'm trying to cache an expensive query that is reused in several requests throughout the site in Rails 3. When a user clicks a table to view reports or when a user clicks to view a map or when a user clicks to print something, this query is performed: reports.where{(time > my{range.begin}) & (time < my{range.end})} It's an expensive query that can result in thousands of records. I want to cache it so after the first time it is called, it is stored in the cache until one of the records in the

问题 What's the best way to handle a user going back to a page that had cached items in an asp.net app? Is there a good way to capture the back button (event?) and handle the cache that way? 回答1: You can try using the HttpResponse.Cache property if that would help: Response.Cache.SetExpires(DateTime.Now.AddSeconds(60)); Response.Cache.SetCacheability(HttpCacheability.Public); Response.Cache.SetValidUntilExpires(false); Response.Cache.VaryByParams["Category"] = true; if (Response.Cache.VaryByParams

问题 I've installed django-redis-cache and redis-py. I've followed the caching docs for Django. As far as I know, the settings below are all that I need. But how do I tell if it's working properly?? settings.py CACHES = { 'default': { 'BACKEND': 'redis_cache.RedisCache', 'LOCATION': '<host>:<port>', 'OPTIONS': { 'DB': mydb, 'PASSWORD': 'mydbspasswd', 'PARSER_CLASS': 'redis.connection.HiredisParser' }, }, } ... MIDDLEWARE_CLASSES = ( 'django.middleware.cache.UpdateCacheMiddleware', ...[the rest of

问题 I have very simple query. I want to make sure that I don't have any confusion. I saw in the spec that caching is not a part of spec and is provided according to specific orm tool providers. I'm using Hibernate as an ORM tool in my application. But to be vendor independent I'm using everything (annotations, classes, etc) of JPA (javax.persistence) and not anything specifically provided by Hibernate. I'm using EntityManager and EntityManagerFactory instead of SessionFactory and Session . My

问题 It's been a long time since I started to search for a Flutter ListView library that will allow me to use pagination in a smart way. Sadly I haven't found anything that meets my criteria: Smart pagination : the library should't simply increase a list page-by-page but must have a fixed size cache which load and keep in memory only the needed pages in the moment. Asyn loading : the library should basically accept a function which returns a future of a list representing a page. Real-time

问题 We have huge rendering spikes with ng-repeat in Angular application. Main page shows a huge list of cover images ("::" and "track by" are in place). On first load it works acceptable. But if user changes the state (we use UI-Router) and goes back to the home page afterwards then it is about 2s delay on desktop and up to 10 sec delay on mobile. It should be instant instead: all json queries are cached. And ng-repeat already rendered that content once. As temporary solution we use angular ux

问题 This is what I have tried from Python/tornadoweb: self.set_header("Cache-Control","no-cache, must-revalidate, max-age=0") self.set_header("Expires","Mon, 26 Jul 1997 05:00:00 GMT") This is what I see from firebug when I first load the page: Cache-Control no-cache, must-revalidate, max-age=0 Content-Length 1715 Content-Type text/html; charset=UTF-8 Etag "e55dc7115d80aa09b470510ababb3515706f4a61" Expires Mon, 26 Jul 1997 05:00:00 GMT Server TornadoServer/2.3 Set-Cookie xsfr

问题 I've built a RESTful API on top of the Django Rest Framework. The URL conf for the API is composed of class based views. I would like to cache these views, however, the following is failing. Any thoughts on why that might be and how I could change it? from django.views.decorators.cache import cache_page urlpatterns = patterns('', url(r'^dounces/?$', cache_page(60*60)(DounceListView.as_view(resource=DounceResource)), name='dounces_api'), I have the following middleware installed. 'django

问题 In Java, are there equivalences to functions such as GNU C extensions prefetch and align(64) , that is, cache line alignment? 回答1: Not that I know of because it doesn't make sense in a compile-on-demand system. With Java, it's the run-time optimizer's job to figure this stuff out and the best result is going to depend on the current platform which may or may not benefit from the constructs that prefetch and align offer. 来源： https://stackoverflow.com/questions/10056407/java-and-cache-memory