c# - ASP.NET Caching, limiting the number of entries in cache -


i'm trying implement data caching web app in asp.net, class , i've been asked limit number of entries in objectcache, not memory size number of entries itself. quite easy since can call objectcache.count, when cache grows beyond established limit (5, testing) can't figure out how remove oldest element stored since it's alphabetically sorted.

this being implemented in service, @ data access layer can't use additional structure queue keep track of insertions in cache.

what can do? there way filter or older element in cache?

here's method code

        public list<eventsummary> findevents(string keywords, long categoryid, int start, int count)     {         string querykey = "findevent-" + start + ":" + count + "-" + keywords.trim() + "-" + categoryid;         objectcache cache = memorycache.default;         list<eventsummary> val = (list<eventsummary>)cache.get(querykey);         if (val != null)             return val;          category evncategory = categorydao.find(categoryid);         list<event> fullresult = eventdao.findbyeventcategoryandkeyword(evncategory, keywords, start, count);         list<eventsummary> summaryresult = new list<eventsummary>();          foreach (event evento in fullresult)         {             summaryresult.add(new eventsummary(evento.evnid, evento.evnname, evento.category, evento.evndate));         }          if (cache.count() >= maxcachesize)         {             //what should here?         }          cache.add(querykey, summaryresult, datetime.now.adddays(cachedays));          return summaryresult;     }

as mentioned in comments, trim method memorycache has lru (least used) policy, behavior looking here. unfortunately, method not based on absolute number of objects remove cache, rather on percentage, int parameter. means that, if try hack way around , pass 1 / cache.count() percentage, have no control on how many objects have been removed cache, not ideal scenario.

another way go diy approach , not use .net caching utilities since, in our case, not seem natively fit needs. i'm thinking of along lines of sorteddictionary timecode of cache objects key , list of cache objects inserted cache @ given timecode values. and, imo, not daring exercice try , reproduce .net cache behavior using, additionnal benefit of directly controlling removal policy yourself.


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more