caching

问题 In an application that has followed a Domain Driven Design where you have the following sorts of concepts A repository that deals with the DataBase access A application service that co-ordinates interactions between enties and value objects etc. where in general would you put caching code to elimenate an expensive call to the database? I have seen code bases that just cache all over the place and it is difficult to monitor memory usage and difficult to provide guidelines to other developers.

问题 Currently our web application takes around 3 mins to load completely without caching and 10 secs with caching. When I open the app through WebDriver its taking around 3 mins to load i.e. caching is not used. I observed this on Firefox and Chrome browser. Not sure how to enabled the driver to use cache instead of loading each file from server every time I open the app. Here are the things I tried. 1. disabled clearing cache on browser exit in browser setting. 2. set 'applicationCacheEnabled'

问题 I am using SDWebImage library to download images from server. https://github.com/rs/SDWebImage SDWebImage not able update the cached image when image updated on server with the same url. 回答1: SDWebImage does some caching by default, so it would be better to use a new URL if the image changes. So, for instance, if you have control over the URL and can change it every time the image has changed, you could do that. If that's not the case, try using SDWebImageRefreshCached in the options field in

问题 I am using SDWebImage library to download images from server. https://github.com/rs/SDWebImage SDWebImage not able update the cached image when image updated on server with the same url. 回答1: SDWebImage does some caching by default, so it would be better to use a new URL if the image changes. So, for instance, if you have control over the URL and can change it every time the image has changed, you could do that. If that's not the case, try using SDWebImageRefreshCached in the options field in

问题 We are moving a site from one CMS to another. The .htaccess file has been changed and it needs to be refreshed for the new site to work right. From what I understand the .htaccess file will only be refreshed if the browser cache is cleared? It is fine for those creating the site to clear our cache, but is there a way to get the users' browsers to get the new .htaccess file without the user clearing cache manually on his own initiative? 回答1: If you're using RewriteRule, just use R instead of R

问题 My website offers an array of web apps for each client. Each client has a different mix of apps that can be used. Each web app is a hosted in a different folder. So I need to cache for each client only it's allowed web apps instead of caching all the apps, many of them he the user, will not use at all. I naively created a global service worker for the shell of the website and custom named service worker for each folder or app. However I noticed that after the first service worker, say sw

问题 I'm using CloudFlare CDN on my Rails 3.1 application. Cloudflare is a CDN that works at the DNS level. On the first hit to a static asset, CloudFlare loads it from your app then caches it in their CDN. Future requests for that asset load from the CDN instead of your app. The problem I'm having is that if you set controller caching to true: config.action_controller.perform_caching = true it enables the Rack::Cache middleware. Since Rails sets a default cache control setting for static assets,

问题 Where is the best place to implement caching in a web based app? At the presentation layer (hope not)? At the Business Logic Layer? At the data layer? I'm going to use something like memcached or MS Velocity under the hood. I'm just finding myself writing so much code to update the cache here and there in the business logic layer, so would it be better to create a fabric in between the data access layer at the Database Server to cache data? I think these complications are down to the fact,

问题 Where is the best place to implement caching in a web based app? At the presentation layer (hope not)? At the Business Logic Layer? At the data layer? I'm going to use something like memcached or MS Velocity under the hood. I'm just finding myself writing so much code to update the cache here and there in the business logic layer, so would it be better to create a fabric in between the data access layer at the Database Server to cache data? I think these complications are down to the fact,

问题 Does anyone have an example how to set up and what entities to cache in fluent nhibernate. Both using fluent mapping and auto mapping? And the same for entity relationships, both one-to-many and many-to-many? 回答1: I have been working a a similar situation, where I just want to cache specific elements, and want these elements to be loaded once on start up, and kept in cache, until the application is shut down. This is a read only cache, and is used to populate a list of countries, so that a