caching

问题 I have the common problem where when users change their profile picture it will not immediately appear on the web page, they will keep seeing the old one until the browser decides to drop the cached version. The common solution for this problem is to add some unique query string so that the browser will not have it cached, like img.png?cache-breaker=rjqwrj0 . This causes another problem for me - it gets logged in the web server's access logs and when they are being parsed each request gets

问题 I am new to Hibernate and was reading about Hibernate First Level Cache. I have a doubt. Will every session that is associated with the SessionFactory have an individual cache or for all the sessions there will be only one cache? Can anyone please explain this . 回答1: The first level cache is associated with Session object. As we know session object is created on demand from session factory and it is lost, once the session is closed. Similarly, first level cache associated with session object

问题 "Implementation" might be an awful strong word, but I wrote some "code" to do cachebusting for a javascript ad serving implementation. I did it with what I presumed was the shortest and most obvious method: var cachebuster=Date.now(); And then append that to the .js query string. I got an e-mail from the ad vendor stating that all script requests had to now include this bit of code: var cachebuster=Math.round(Math.random() * 100000); Presumably the vendor doesn't know we were already doing

问题 I have a problem. I created the android app, when I start the app I see 48,09 MB cache memory. My app uses different libraries, has a lot of classes. I can't find a reason why the app uses so many cache memory? How do I find the problem? Interesting thing : When I start an empty app, this app uses approximately 4Mb cache memory , I think it's too much. 来源： https://stackoverflow.com/questions/37792548/mobile-app-uses-a-lot-of-cache-memory

问题 This error occures in TYPO3 7.6.10 with a piBase extension and realurl 2.0.15: In this extension, I'm checking for a GET parameter, e.g. a country. If this parameter is not provided, I redirect to the same page, with default country as parameter: if(!$this->piVars['country']) { $this->piVars['country'] = 'germany'; \TYPO3\CMS\Core\Utility\HttpUtility::redirect($this->pi_linkTP_keepPIvars_url(array(), true), \TYPO3\CMS\Core\Utility\HttpUtility::HTTP_STATUS_303); } That means, the visitor e.g.

问题 This is a follow up to Caching the mean of a Vector in R and is specifically about the last line of code list(set = set, get = get, setmean = setmean, getmean = getmean) I am not understanding what the list is doing. The answer given at the linked question: list() returns the 'special vector' containing all of the functions just defined does not make much sense to me. I think that makeVector should be returning an object which has the approriate set and get methods, but now sure how this list

问题 I want the two iframes <iframe src="www.URL.com?name=benny&runtime=1231231> <iframe src="www.URL.com?name=benny&runtime=757847584> which are loaded at different times to be mapped to the same cached value in the browser. The server has nothing to do with this. Basically, is there a way to have chrome, firefox, etc... cache api ignore certain parameters (in this case 'runtime') when looking up a src. Passing a separate param or making a separate call for runtime will not work in the use case

问题 I am trying my hands around using memcache with django on per-view cache. The trouble is cache only gets set if i refresh a page,clicking on same link does not sets the cache.(that is if i set cache_view on dispatch and reload page, i see the number of queries fall down to 3-4 queries otherwise on clicking the same link, cache is not set, and i get the same number of queries even after hitting the same url again and again) Here is my views: class ProductCategoryView(TemplateView): """ Browse

问题 Let's imagine that I have a method which can updates one field for all entities. public void makeAllCarsRed(){...} I know that Spring offers 3 annotation to manage cache: @Cacheable - tries to find value in cache. If cannot find - execute method and adds to cache; @CachEvict - just remove objects from cache by criteria; @CachPut - put new value to cache I don't see a way to apply these annotations for my situation. P.S. I think that it is too expensive to invalidate all cach 回答1: Spring

问题 I wish to change the session state provider dynamically when a web page loads. Locally, while developing, we use the following: <sessionState mode="InProc" /> But production code runs like this: <sessionState mode="Custom" customProvider="CustomSessionStateProvider"> <providers> <add name="CustomSessionStateProvider" type="Library.CustomSessionStateProvider" applicationName="AppName" /> </providers> </sessionState> Is it not possible to change which provider the sessionState uses at runtime