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  • Simple Data Caching using Weak References in WCF

    - by Tawani
    Given that I have the following WCF service: class LookUpService { public List<County> GetCounties(string state) { var db = new LookUpRepository(); return db.GetCounties(state); } } class County { public string StateCode{get;set;} public string CountyName{get;set;} public int CountyCode{get;set;} } What will be the most efficient (or best) way to cache a state's counties using weak references (or any other approach) so that we don't hit the database every time we need to look up data. Note that we will not have access to the HttpRuntime (and HttpContext).

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  • How to throttle login attemps in Java webapp?

    - by Jörn Zaefferer
    I want to implement an efficient mechanism to throttle login attemps in my Java web application, to prevent brute-force attacks on user accounts. Jeff explained the why, but not the how. Simon Willison showed an implementation in Python for Django: That doesn't really help me along as I can't use memcached nor Django. Porting his ideas from scratch doesn't seem like a great either - I don't want to reinvent the wheel. I found one Java implementation, though it seems rather naiive: Instead of a LRU cache, it just clears all entries after 15 minutes. EHCache could be an alternative for memcached, but I don't have any experience with it and don't really want to intoduce yet another technology if there are better alternatives for this task. So, whats a good way to implement login throttling in Java?

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  • $.blockUI loading mask

    - by usman
    hi, i am using jQuery BlockUI Plugin (v2) to block and unblock while loading and when on clicking some button.but my problem is masking is working fine while loading page but it is not working when we click button,here is my code $("input[name^=filtera]").click(function(){ $.blockUI({message:'<h3><img src="images/spinner.gif" /> Please Wait...</h3>'}); $.ajax({ url : "ChangeRequestSearch.action?last_date_modified=" + modifiedDate , cache: false, success : function (data) { $("#tableLoader").html(data); } }); $().ajaxStop($.unblockUI); }); i am getting the Error: $.blockUI is not a function let me know what is the problem Thanks Usman.sk

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  • jQuery Tips and Tricks

    - by roosteronacid
    Miscellaneous Creating an HTML Element and keeping a reference, Checking if an element exists, Writing your own selectors by Andreas Grech The data function - bind data to elements by TenebrousX The noConflict function - Freeing up the $ variable by Oli Check the index of an element in a collection by redsquare The jQuery metadata plug-in by kRON Live event handlers by TM Isolate the $ variable in noConflict mode by nickf Replace anonymous functions with named functions by ken Microsoft AJAX framework and jQuery bridge by Slace jQuery tutorials by egyamado Remove elements from a collection and preserve chainability by roosteronacid Declare $this at the beginning of anonymous functions by Ben FireBug lite, Hotbox plug-in, tell when an image has been loaded and Google CDN by Colour Blend Judicious use of third-party jQuery scripts by harriyott The each function by Jan Zich Form Extensions plug-in by Chris S Syntax No-conflict mode by roosteronacid Shorthand for the ready-event by roosteronacid Line breaks and chainability by roosteronacid Nesting filters by Nathan Long Cache a collection and execute commands on the same line by roosteronacid Contains selector by roosteronacid [Defining properties at element creation][26] by roosteronacid Optimization Optimize performance of complex selectors by roosteronacid The context parameter by lupefiasco Save and reuse searches by Nathan Long

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  • Caching query results in django

    - by Marcio Cruz
    I'm trying to find a way to cache the results of a query that won't change with frequency. For example, categories of products from an e-commerce (cellphones, TV, etc). I'm thinking of using the template fragment caching, but in this fragment, I will iterate over a list of these categories. This list is avaliable in any part of the site, so it's in my base.html file. Do I have always to send the list of categories when rendering the templates? Or is there a more dynamic way to do this, making the list always available in the template?

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  • MongoDb vs Ehcache caching advise for speeding up read only mysql Database

    - by paddydub
    I'm building a Route Planner Webapp using Spring/Hibernate/Tomcat and a mysql database, I have a database containing read only data, such as Bus Stop Coordinates, Bus times which is never updated. I'm trying to make the app run faster, each time the application is run it will preform approx 1000 reads to the database to calculate a route. I have setup a Ehcache which greatly improves the read from database times. I'm now setting terracotta + Ehcache distributed caching to share the cache with multiple Tomcat JVMs. This seems a bit complicated. I've tried memcached but it was not performing as fast as ehcache. I'm wondering if a MongoDb would be better suited. I have no experience with nosql but I would appreciate if anyone has any ideas. All i need is quick access to the read only database.

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  • setting jQuery .data() within .getJSON callback

    - by hackmaster.a
    I'm doing a couple of .getJSON calls and if any one of them succeeds, I'm trying to set a bool to true so I can then do some other stuff elsewhere on the page. I was trying to use jquery's .data() function, but I don't seem able to set it from inside the .getJSON callback. for example: $('#citations_button').data('citations', false); $.getJSON(apaurl, function(data) { $('#apacite').html("<td class=\"bibInfoLabel\">APA Citation</td><td class=\"bibInfoData\">"+data+"</td>"); $('#citations_button').data('citations', true); }, "html"); // other .getJSONs look like above... console.log("citations? "+$('#citations_button').data('citations')); prints false, even when I know the data came through. I thought this would work since .data() uses the cache to store the key/value pair. how can i flag successes?? appreciate any assistance!!

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  • Configuring asp.net web applications. Best practices

    - by Andrew Florko
    Hello everybody, There is a lot of configurable information for a web-site: UI messages Number of records used in pagination & other UI parameters Cache duration for web-pages & timeouts Route maps & site structure ... There are many approaches to store all this information also: AppSettings (web.config) Custom sections (web.config) External xml/text files referred from web.config Internal static class(es) of constants Database table(s) ... What approaches do you usually choose for your tasks & what approaches do you find unsuitable? Thank you in advance!

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  • Installing ruby1.8 failed

    - by Subhransu
    I was trying to install ruby on my remote server I got this error: The Command: sudo apt-get install ruby1.8 Error : W: Not using locking for read only lock file /var/lib/dpkg/lock E: Unable to write to /var/cache/apt/ E: The package lists or status file could not be parsed or opened. then I tried : sudo dpkg -- configure -a Output: dpkg: need an action option Type dpkg --help for help about installing and deinstalling packages [*]; Use `dselect' or `aptitude' for user-friendly package management; Type dpkg -Dhelp for a list of dpkg debug flag values; Type dpkg --force-help for a list of forcing options; Type dpkg-deb --help for help about manipulating *.deb files; Options marked [*] produce a lot of output - pipe it through `less' or `more' ! What should I do ?

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  • jQuery .ajax() call to page method works in FF only when async is false

    - by Steve
    I'm calling a page method using .ajax() and it works in IE8 whatever the value of async is. However, in FF3.6, it only works with async set to false. When async is set to true, in Firebug, I just see status aborted. The page validates. I can work with async set to false, but any clues as to why FF can't work with async set to true? $("[id$='_www']").click(function() { var hhh = false; $.ajax({ async: false, cache: false, type: "POST", url: "/abc/def.aspx/jkl", contentType: "application/json; charset=utf-8", dataType: "json", data: "{ 'eee': '" + window.location.href.match(/\d{1,3}$/) + "', 'ttt': '" + $("[id$='_zzz']").val() + "' }", success: function(msg) { $("#ggg").html(msg.d); }, error: function(xhr, err) { hhh = true; } }); return hhh; });

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  • Build and render infinite hierarchical category tree from self-referential category table

    - by FreshCode
    I have a Categories table in which each category has a ParentId that can refer to any other category's CategoryId that I want to display as multi-level HTML list, like so: <ul class="tree"> <li>Parent Category <ul> <li>1st Child Category <!-- more sub-categories --> </li> <li>2nd Child Category <!-- more sub-categories --> </li> </ul> </li> </ul> Presently I am recursively rendering a partial view and passing down the next category. It works great, but it's wrong because I'm executing queries in a view. How can I render the list into a tree object and cache it for quick display every time I need a list of all hierarchical categories?

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  • actionscript swf: why the swf is cached in one web server

    - by Bin Chen
    Hi, I have one swf and a program to load this swf. The swf is put in a server. I encounter a weird problem that if I put this swf in serverA, each time my program will issue a http request to that webserver(with 304 response). But when I move the swf from serverA to serverB, some weird things happen, the progrom will only issue the first time http request, and after that, it didn't send any http request, it looks like it uses the cache in the disk. I wonder is how can I configure serverA make the behavior the same as serverB, as I guess the problem may exists in the http response that make the program not retrieving the swf from serverB any more. Bin

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  • How to remove default header from WCF REST Outgoing Response?

    - by bmsantos
    The following C# WCF based REST service gives me some undesired headers that I'm not sure if I can remove them trough the API. The interface: [ServiceContract] public interface IControlSystem { [OperationContract] [WebGet] System.IO.Stream About(); } The implementation: public class ControlSystem : IControlSystem { public System.IO.Stream About() { return new System.IO.MemoryStream(ASCIIEncoding.Default.GetBytes("Hello World")); } } Out of a raw socket connection it gives the following response: HTTP/1.1 200 OK Server: ASP.NET Development Server/9.0.0.0 Date: Tue, 15 Jun 2010 13:12:51 GMT X-AspNet-Version: 2.0.50727 Cache-Control: private Content-Type: application/octet-stream Content-Length: 39 Connection: Close Hello World Question is, is it possible to get the server to not report anything other than the actual message? Need it in some calls so due to some small embedded device clients that will try to connect to the server and I would like to minimize the amount of parsing. Thanks, B.

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  • MVC4 bundling GZIP and headers

    - by plurby
    I'm testing my site with Google PageSpeed and YSlow and the bundles that i've created with MVC4 bundles aren't getting Gzipped (Compressing resources with gzip or deflate can reduce the number of bytes sent over the network) and there is no Vary: Accept-Encoding header (Instructs proxy servers to cache two versions of the resource: one compressed, and one uncompressed. This helps avoid issues with public proxies that do not detect the presence of a Content-Encoding header properly.) And also how can i add encoding header for the whole scripts folder on the ISS. I know there is HTTP Response Headers, then Add Custom HTTP Response Header, but will this work on the whole scripts folders and subfolders and what to put in the Name and Value fields. How can this be solved. Regards.

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  • IE9 syntax on jquery crossbrowser with jsonp and FF, Chrome

    - by Andrew Walker
    I have the following code and i have a problem in ensuring part of it is used when a IE browser is used, and remove it when any other browser is used: $.ajax({ url: 'http://mapit.mysociety.org/areas/'+ulo, type: 'GET', cache: false, crossDomain: true, dataType: 'jsonp', success: function(response) { This works fine in IE9 because I have put the dataType as jsonp. But this will not work on Chrome or FF. So I need to remove the dataType. I tried this: <!--[IF IE]> dataType: 'jsonp', <![endif]--> But it did not work. It's worth noting, it does not need the dataType set when in FF or Chrome as it's json. Whats the correct syntax to have this work ? Thanks Andrew

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  • CSS Files Don't Refresh with Wicket (Launched in Intellij via Start.java)

    - by Scanningcrew
    I have create a skeleton Wicket project using mvn archetype:create -DarchetypeGroupId=org.apache.wicket -DarchetypeArtifactId=wicket-archetype-quickstart -DarchetypeVersion=1.4-rc4 -DgroupId=com.mycompany -DartifactId=myproject All the configuration/importing new project with Maven/Intellij worked fine. I proceeded to add a basic CSS file to my start page, per the following recommended way of doing it in Wicket 1.4 public class BasePage extends WebPage { public BasePage() { add(CSSPackageResource.getHeaderContribution(BasePage.class, "main.css")); } } The main.css file has been put along side BasePage.java and BasePage.html in /src/main/java. I launch the application with Start.java. The problem is when I make changes to the CSS file it is not being picked up when I relaunch Start.java. (Changes to the java and html files are being updated when I change them) I made sure the browser cache was being cleared, and even valided the request/response in Firfox/Firebug. It seems like somewhere between Wicket's magic and the jetty instance Start.java creates the CSS file is being cached and not updated. Any ideas?

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  • How do I get Flex Builder to use the selected framework?

    - by Michael Prescott
    I'm attempting to create a Flex Project that will cause the Flash Player to cache the Flex framework. Flex Builder comes with Flex SDK 3.2.0.3958 and setting the Framework Linkage to use Runtime shared Library (RSL) under Project Properties - Flex Build Path will separate the framework from my main application and I see that my project's bin-debug directory contains framework_3.2.0.3958.swf and *.swz for distribution. Flex SDK 3.4 fixes a few bugs, so I configured it as another available sdk and set it as the default SDK. When I compile, I expect the bin-debug directory to contain framework_3.4.0.9271.swf and *.swz; however, Flex Builder is still writing framework_3.2.0.3958.swf and *.swz. How do I configure Flex Builder to package the correct framework files for Flash Player caching?

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  • SEO chaos from changing robots.txt file in Wordpress site

    - by Seedorf
    Hi there, I recently edited the robots.txt file in my site using a wordpress plugin. However, since i did this, google seems to have removed my site from their search page. I'd appreciate if I could get an expert opinion on why this is so, and a possible solution. I'd initially done it to increase my search ranking by limiting the pages being accessed by google. This is my robots.txt file in wordpress: User-agent: * Disallow: /cgi-bin Disallow: /wp-admin Disallow: /wp-includes Disallow: /wp-content/plugins Disallow: /wp-content/cache Disallow: /trackback Disallow: /feed Disallow: /comments Disallow: /category/*/* Disallow: */trackback Disallow: */feed Disallow: */comments Disallow: /*?* Disallow: /*? Allow: /wp-content/uploads Sitemap: http://www.instant-wine-cellar.co.uk/wp-content/themes/Wineconcepts/Sitemap.xml

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  • Logging strategy vs. performance

    - by vtortola
    Hi, I'm developing a web application that has to support lots of simultaneous requests, and I'd like to keep it fast enough. I have now to implement a logging strategy, I'm gonna use log4net, but ... what and how should I log? I mean: How logging impacts in performance? is it possible/recomendable logging using async calls? Is better use a text file or a database? Is it possible to do it conditional? for example, default log to the database, and if it fails, the switch to a text file. What about multithreading? should I care about synchronization when I use log4net? or it's thread safe out of the box? In the requirements appear that the application should cache a couple of things per request, and I'm afraid of the performance impact of that. Cheers.

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  • Best practice to display POI in iPhone's MapKit?

    - by iamj4de
    Assuming I have a database of POI with their respective coordinates (longitude & latitude). What would be the "standard" way to display the POI as annotations around the user's current location? To elaborate: Given a zoom level, I guess I have to search through the database for all POI whose distance to the current location < a certain threshold, then create annotations for them. Or is there any smarter way? If the user zooms in/out, moves the map... I will need to redo the whole thing again? It seems that MapKit has a mechanism to cache/reuse annotations. Should I create a lot of them right away and let MapKit decides what to render when the visible region changes? I guess this would make the transition smoother, but also consumes more memory. What is your experience with this? Thanks.

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  • How to set a Transparent Background of JPanel

    - by Imran
    Hi, I need to know if a JPanel`s bacground can be set to Transparent? My frame is has two Jpanels Image Panel and Feature Panel, Feature Panel is overlapping Image Panel, the Image Panel is working as a background and it is loading image from a remote Url, now I want to draw shaps on Feature Panel , but now Image Panel cannot be seen due to Feature Panel's background color. I need to make Feature Panel background transparent while still drawing its shapes and i want Image Panel to be visible since it is doing tiling and cache function of images. I need to seperate the image drawing and shape drawing thats why I`m using two jPanels! is there anyway the overlapping Jpanel have a transparent background? thanks

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  • how to precompile sass with gruntjs?

    - by chovy
    There seem to be a few plugins...and I'm using webstorm file watcher which also precompiles individual files. I think this may not be the best way to setup a watcher. I'm running this command now: sass --no-cache --update --stop-on-error --trace ./app/sass:./app/css It seems to conflict with the webstorm file watch, which appears to be appending everything to base.css. Can someone tell me what exactly this command is doing vs. a sass filewatcher in webstorm? What's the best way to work with sass: precompile my sass to css using a grunt build task and have file watchers while developing? My base.sass looks like this: @charset "UTF-8"; /* DO NOT EDIT FILES IN ./css. See ./sass instead */ @import "page"; @import "modal"; @import "nav"; @import "tables"; @import "forms"; @import "message";

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  • Using memcache to store obj's in google app engine.

    - by fredrik
    Hi, I'm trying to use memcache to cache data retrevied from the datastore. Storing stings works fine. But can't one store an object? I get an error "TypeError: 'str' object is not callable" when trying to store with this: pageData = PageType(page) memcache.add(memcacheid, pageData, 60) I've read in the documentation that it requires "The value type can be any value supported by the Python pickle module for serializing values." But don't really understand what that is. Or how to convert pageData to it. Any ideas? ..fredrik

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  • Synchronizing two SQL Server databases using MS Sync Framework

    - by Immortal
    I have one central SQL Server database which can be offline from time to time. I have a desktop application using Local DB Cache (SQL CE) to synchronize with the central database and I also have a web application with its own SQL Server that I'd also would like to keep synchronized. All synchronizations must be bidirectional. Is there a way to synchronize my central database with web application's database in the same way as I synchronize my central database with desktop client? I know about collaboration scenarios and peer-to-peer synchronization but I would like to avoid manual provisioning of databases. I'd like to use integrated sql server 2008 change tracking just like in the SQL CE <-- SQL Server scenario.

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  • Server side caching doesn't work with HttpHandler

    - by Lieven Cardoen
    If we use an aspx page with a Caching Profile, the server caches images that are loaded with the aspx page. So if ten clients load the same image through the aspx page (same url), for one client the image is gotten out of the db, for the nine others it is cached. When we use a HttpHandler, this doesn't happen. The image is always fetched from the database. We have tried all different settings without any success. (we have checked this link and have not been able to cache on server side).

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