caching

问题 I'm developing an application using Gmap in c# (great API, btw), not to confuse with google-map API, and I did some really cool and useful stuff ever since. My problem is that some of my clients won't have an internet connection, and that is why I need to be able to display the background (the map) offline. I used to use the property GMap.NET.AccessMode.ServerAndCache; to get my data from the server, and now I would like to be able to use GMap.NET.AccessMode.CacheOnly with a full cache.

问题 I'm using the standard (as opposed to NonRel) version of Django connected to PostgreSQL on top of Apache + mod_wsgi. This setup also connects to MongoDB (some data is saved externally). Right now I have to create a new MongoDB connection for each Django request, and pass it along throughout the call stack to all functions that require access to MongoDB. Is there a way to cache connections between requests? Edit At the risk of blasphemy, would a global variable work in this case? 回答1: There

问题 Does Android maintain a memory cache of application drawable resources and reuse them, or it is a good practice to preload all drawables that may be assigned dynamically to different widgets? For instance: public static final int[] SETS = { R.drawable.set0, R.drawable.set1, R.drawable.set2, R.drawable.set3, R.drawable.set4, R.drawable.set5, R.drawable.set6, R.drawable.set7, R.drawable.set8, R.drawable.set9, R.drawable.set10}; public Drawable[] sets; void init() { load(sets, SETS); } public

问题 I have a project for school and I have to use Java. Recently I found play framework and I want to try to use it. It's easy enough for a quick start, but I ran into a problem with session. Being stateless by its nature, play sends entire session to user in cookie and receives it on next request, so it allows only limited amount of data in session. What I want to do is to fetch User object from DB on user login, and keep it in session, so I could access it from templates and so on (I have some

问题 I have a UIVC loading from a Storyboard which, in turn, loads a Xib. This inner load is causing the VC to take more than a second to load. There is some fancy footwork going on in the inner xib (it loads another xib which has dynamic drawing) but this doesn't appear to be the bottleneck. According to Instruments, UIFont -initWithCoder is the culprit. (If you drill down further TBaseFont::CopyLocalizedName() is the deepest entry that accounts for the majority of the 1s time) I'm a bit stumped

问题 I've written a Chrome Extension for my library. It uses chrome.storage.local to cache things. Does anyone know how to drop the cache for testing purposes? I can't really test things anymore as all the data is now in cache. I'd like to drop it and make sure it gets repopulated correctly, etc. How do I do that? I tried "Refresh"-ing the extension but that did nothing. Removing and adding the extension doesn't appear to clean cache either. 回答1: Use chrome.storage.local.clear() To check the

问题 I've written a Chrome Extension for my library. It uses chrome.storage.local to cache things. Does anyone know how to drop the cache for testing purposes? I can't really test things anymore as all the data is now in cache. I'd like to drop it and make sure it gets repopulated correctly, etc. How do I do that? I tried "Refresh"-ing the extension but that did nothing. Removing and adding the extension doesn't appear to clean cache either. 回答1: Use chrome.storage.local.clear() To check the

问题 On CPUs like x86, which provide cache coherency, how is this useful from a practical perspective? I understand that the idea is to make memory updates done on one core immediately visible on all other cores. This is a useful property. However, one can't rely too heavily on it if not writing in assembly language, because the compiler can store variable assignments in registers and never write them to memory. This means that one must still take explicit steps to make sure that stuff done in

问题 On CPUs like x86, which provide cache coherency, how is this useful from a practical perspective? I understand that the idea is to make memory updates done on one core immediately visible on all other cores. This is a useful property. However, one can't rely too heavily on it if not writing in assembly language, because the compiler can store variable assignments in registers and never write them to memory. This means that one must still take explicit steps to make sure that stuff done in

问题 We're making changes to our main sprite and I'm debating the benefits of either changing its name completely or adding a query string to the end. There's logic to keeping the old version to support Google cache, archive.com, etc., but it'd also be much cleaner on our system if I was to just edit the file and add a query string to the CSS image call: #element-id { background-image: url('my-sprite.png?version1'); } My question is, does anyone know of any browser issues with using a query string