caching

问题 Suppose that I have controller home_controller.rb with action index . I want to cache index page so I'm doing: caches_page :index but want it to cache only for users that are not signed in. If I'll make conditional like: caches_page :index, :if => :user_not_signed_in? Page will be cached while first not logged in user comes. Now every logged in user also see not-logged in content. Is there a way to separate this action without changing url? 回答1: cache_if and cache_unless seems to be the

问题 Is it "better" (more efficient, faster, more secure, etc) to (A) cache data that is used on every page load in the $_SESSION array (but still querying a table for a flag to reload the data fresh), or (B) to load it from the database each time? I'm using the cache method (A), but I'm worried that with hundreds of users, memory could become an issue? It's just simple data, like firstname, lastname, birthday, etc. With either method, there's still a query being run. Thoughts? 回答1: If your data

问题 I'm writing an Android app which receives information from a Bluetooth device. Our client has suggested that the Bluetooth device (which they produce) will change its name depending on certain conditions - for the simplest example its name will sometimes be "xxx-ON" and sometimes "xxx-OFF". My app is just supposed to seek this BT transmitter (I use BluetoothAdapter.startDiscovery() ) and do different things depending on the name it finds. I am NOT pairing with the Bluetooth device (though I

问题 EDIT: The original question is still contained below, but I decided to re-title to a form that will be more useful to developers in a variety of cases, some of which described in my answer below, as the solution to the original problem turned out to provide a much wider area of application. I have a set of greyscale icons for an application, and a requirement that the icon color can be changed by the user. So, the obvious solution is to use the stock Colorize element from QtGraphicalEffects .

问题 I have an object (actually, an array of objects) that's 302MB. When I try to cache it with memcached it doesn't work, no matter how much memory I give memcached, apparently because memcached has a 1MB limit on objects that it can cache. (I might be wrong about that last part. I haven't been able to find great documentation.) Any suggestions on how to cache this thing? I'm using PHP/symfony on Linux. 回答1: Quoting 15.5.5.4: What is the max size of an object you can store in memcache and is that

问题 Currently I'm working on small project that require me to host my laravel app on shared hosting (please ignore the reason why I didn't use VPS to host my laravel project) and this hosting provider disable escapeshellarg() for security reason so I can't use php artisan config:cache to clear config cache. Is there any workaround for this? 回答1: config:clear command just deletes bootstrap/cache/config.php file, so just delete this file manually. 回答2: You can call artisan commands programmatically

问题 Currently I'm working on small project that require me to host my laravel app on shared hosting (please ignore the reason why I didn't use VPS to host my laravel project) and this hosting provider disable escapeshellarg() for security reason so I can't use php artisan config:cache to clear config cache. Is there any workaround for this? 回答1: config:clear command just deletes bootstrap/cache/config.php file, so just delete this file manually. 回答2: You can call artisan commands programmatically

问题 I'm new to angularJS and have a question about caching etc. I have a wizard with two steps, I want to be able to click back and next and have the forms still filled out as the user had them. In my page1Partial i have this: <li ng-repeat="pick in picks | orderBy:orderProperty"> <b><span ng-bind="pick.name"/></b> <input type="checkbox" ng-model="pick.checked" ng-click="updateBasket(pick)"> </li> When i go to the next page, then click back the checkboxs are cleared, and its because my RESful

问题 What I am trying to do: A dynamic countdown clock in the body of an email What is causing me pain: Google's decision to cache images for users of the gmail client I implemented an email countdown clock for my company last November using this technique: Countdown Timer Image GIF in Email Worked like a charm, however in December, a major monkey wrench was thrown by Google when they decided to cache all images for people using Gmail clients. http://kickdynamic.com/update-on-the-gmail-image

问题 I have quite a heavy function in MATLAB: function [out] = f ( in1, in2, in3) Which is called quite often with the same parameters. The function is deterministic so for given input parameters its output will always be the same. What would be the simplest way of storing the results of computed inputs in the function such that if the function will be called again with the same output it would be able to answer quickly? Is a persistent variable which maps (using containers.Map or some other class