invalidation

问题 I am currently working on a custom View which draws some tiles on the canvas. Those tiles are loaded from several files and will be loaded when needed. They will be loaded by an AsyncTask. If they are already loaded they will just be painted on the canvas. This is working properly! If those pictures are loaded the AsyncTask is firing view.postInvalidate() The problem is that my custom View is not firing onDraw(Canvas canvas) everytime I fire view.postInvalidate(). The view.postInvalidate only

问题 How is it possible to invalidate the whole output cache in asp .net mvc 2? 回答1: AFAIK this is not possible. You can only invalidate specific actions that might have been cached by decorating them with the [OutputCache] attribute. HttpResponse.RemoveOutputCacheItem(Url.Action("Index", "Products")); 回答2: While I don't know if there is a way to do it in code, still recycling the worker process might invalidate the server cache. If this is true then you might even do it in code by having code to

问题 Problem is to stop NSTimer, for some reason [Timer invalidate] just not working... Maybe my eyes are full of soap, but can't understand the reason why the timer didn't stop at 0, but go reverse counting -1, -2, -3 and so on...((( I'm using epoch numbers as destination date. One more thing - my button "IBAction stop" with [Timer invalidate] works just fine - when i push it in simulator timer stops... @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; Timer = [NSTimer

问题 I've been developing an app to draw in ics android tablets and i've encountered an issue I can't figure out how to fix. The problem is that I draw correctly and in a real time drawing BUT when I go really really fast (tested on real tablets) the circles are not really circles, they look like pilygons of 5 or 6 sides... Here I declare the bitmap and assign it to the canvas: Display display = getWindowManager().getDefaultDisplay(); Point size = new Point(); display.getSize(size); width = size.x

问题 i try to save user session in a hashmap on every cluster. and when i need to invalidate it, i will take specified session id. and invalidate it where the session created with normal way to invalidate session. public class SessionListener implements HttpSessionListener { public HashMap<String, HttpSession> sessionHolder = new HashMap<String, HttpSession>(); @Override public void sessionCreated(HttpSessionEvent se) { sessionHolder.put(se.getSession().getId(), se.getSession()); } public void

问题 If I use a const reference to another member, is it possible that this reference gets invalidated? class Class { public: const int &x{y}; private: int y; }; For example when I use instances of this class in a vector which increases its capacity after a push_back . According to the standard all iterators and references are invalidated if a vector has to increase its capacity. Is the reference still valid after that? 回答1: This is currently not safe, as when you copy an instance of Class , x

问题 I use the following user interface: A parent relative layout parentLayout with the dimensions 800x600 (width x height) A second relative layout childLayout , which is a child of the parent layout. It has the dimensions 800x1000, i.e. it is larger than the parent layout. parentLayout.addView(childLayout); My goal: Scrolling childLayout by using childLayout.scrollTo(x,y) . When I use childLayout.scrollTo(x,y) , Android scrolls childLayout but doesn't refresh (redraw) it. The effect is, that

问题 So here is the problem. When a user logs out of my website, they can still hit the back button and continue using the site. To keep track of whether the user is logged in or not, I created a session attribute "isActive". The attribute is set to true when the user logs in, and is (redundantly) removed right before the session is invalidated at logout. Also on every page I check if the attribute is present. I also specify that pages should not be cached in their head tags. Despite this users

问题 I am deleting a single path from the Django cache like this: from models import Graph from django.http import HttpRequest from django.utils.cache import get_cache_key from django.db.models.signals import post_save from django.core.cache import cache def expire_page(path): request = HttpRequest() request.path = path key = get_cache_key(request) if cache.has_key(key): cache.delete(key) def invalidate_cache(sender, instance, **kwargs): expire_page(instance.get_absolute_url()) post_save.connect

问题 A project I am working on uses Spring 2.5 & JPA with Hibernate as a provider. My DAO classes extend JpaDaoSupport, so I get my JpaTemplate using the getJpaTemplate() method. The back-end database can get changed either by my application, or a third-party application. When a third-party application changes the database (mostly configuration data changes), I need to provide the user of my application a way to invalidate all JPA sessions and reload the new data (i.e. invalidate all the hibernate