caching

How to prevent caching of pages in Spring MVC?

你说的曾经没有我的故事 提交于 2019-12-24 11:53:32
问题 Consider: In IE 9 , To clear Cache , I did: Open IE, Press F12, then Ctrl + R A pop-up "Are you sure you want to clear browser cache" pops up Select Yes. Filter: @WebFilter("*.*") public class NoCacheFilter implements Filter { @Override public void destroy() { } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletResponse response = (HttpServletResponse) res; response.setHeader("Cache-Control", "no-cache,

Caching moderate amounts of data in a web app - DB or flat files?

我与影子孤独终老i 提交于 2019-12-24 11:35:39
问题 A web app I'm working on requires frequent parsing of diverse web resources (HTML, XML, RSS, etc). Once downloaded, I need to cache these resources to minimize network load. The app requires a very straightforward cache policy: only re-download a cached resource when more than X minutes have passed since the access time. Should I: Store both the access time (e.g. 6/29/09 at 10:50 am) and the resource itself in the database. Store the access time and a unique identifier in the database. The

how the cache size and array size affect the performance of mathematical operations on an array?

南楼画角 提交于 2019-12-24 11:35:22
问题 I am trying to learn the usage of cache. From what I see by doing some sample experiment program, the time taken for execution of a program iterating through an array and doing some operations on the elements suddenly increases very much if I increase the array size beyond a particular value.Can anyone explain in simple terms how the cache size and array size affect the performance of mathematical operations on an array? 回答1: If the cache is not able to accumulate the array, any reference to

hibernate session close

泄露秘密 提交于 2019-12-24 11:34:36
问题 I just followed a simple hibernate struts tutorial and succesfully made db calls through hibernate. However I don't see the code closing the hibernate connection anywhere. sessionFactory.getCurrentSession(); is used to get the session per request. Should I close this session when the user logs out? or after each request of is this something taken care of by the framework? a second related question is, In what kind of use case would I use a hibernate session interceptor? and a third question

How to set the auxiliary disk cache programmatically using jcs

Deadly 提交于 2019-12-24 11:28:12
问题 I am obtaining my cache object like this CacheAccess<Object, Object> cache = JCS.getInstance("queries"); I have put a config file in the classpath cache.ccf. For debugging reasons I want to set the aux disk cache path programmatically, but do not know how to obtain the interface I need. I know there exsists an attribute class where one may set this path, but I do not know how to get the instance of this class which refers to the cache I am using. Any ideas? 来源: https://stackoverflow.com

android picasso invalidate not working [duplicate]

泄露秘密 提交于 2019-12-24 11:27:48
问题 This question already has answers here : Invalidate cache in Picasso (14 answers) Closed 3 months ago . if(isConnected()) { // if device online Picasso.with(context) .load(url) .networkPolicy(NetworkPolicy.NO_CACHE) .placeholder(R.drawable.ic_contact_picture) .error(R.drawable.ic_contact_picture) .into(imageView, new Callback() { @Override public void onSuccess() { } @Override public void onError() { Picasso.with(context).invalidate(url); } }); } else { // if device offline Picasso.with

What's a suitable storage RDBMS,NoSQL, for caching web site responses?

為{幸葍}努か 提交于 2019-12-24 11:13:49
问题 We're in the process of building an internal, Java-based RESTful web services application that exposes domain-specific data in XML format. We want to supplement the architecture and improve performance by leveraging a cache store. We expect to host the cache on separate but collocated servers, and since the web services are Java/Grails, a Java or HTTP API to the cache would be ideal. As requests come in, unique URI's and their responses would be cached using a simple key/value convention, for

ParseObject.pinAllInBackground() results with NullPointerException

╄→гoц情女王★ 提交于 2019-12-24 10:55:40
问题 I have a News objects that extends ParseObject class. I'd like it to be cached locally so that I can fetch it from local store later. Here is my callback that includes call to .pinAllInBackground(..) method: FindCallback<News> onNewsReceived = new FindCallback<News>() { @Override public void done(List<News> arg0, ParseException arg1) { if (arg1 == null) { newsList = new ArrayList<News>(arg0); ParseObject.pinAllInBackground(newsList); initializeList(); } else { Log.d("TAG1", String.valueOf

Django's caching middleware not working in Gunicorn with Debug=False

那年仲夏 提交于 2019-12-24 10:49:54
问题 I have a Django project deployed with Gunicorn and nginx. I also have a memcached running and the Django cache middleware () set up to cache the site. Everything works fine when running with DEBUG=True, but when I switch to DEBUG=False I get the following error in Gunicorn log when trying to access the site: 2013-02-20 16:09:50 [25196] [ERROR] Error handling request Traceback (most recent call last): File "/home/toursprung/.virtualenvs/myproject/lib/python2.6/site-packages/gunicorn/workers

Write back cache formula with write allocate policy

断了今生、忘了曾经 提交于 2019-12-24 10:45:09
问题 If we consider an hierarchical single level write back cache with write allocate policy , then the formula for average access time during write operation is given by :- Twrite = (H)(Tc) + (1-H)(Tc + Tm + (x*Tm)). Where, H= hit ratio of cache. Tc=access time of cache. Tm= access time of memory. x= fraction of cache blocks which are dirty. The above formula is given in this site https://gateoverflow.in/14480/formula-write-back-write-through-access-time-parallel-serial?show=14502#a14502 However,