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• rails - caches_action expire_action

  - by mark

  Hi I want to expire a cached action and wondered how to generate the correct reference. #controller caches_action :index, :layout => false #generates this fragment which works fine views/0.0.0.0:3000/article/someid/posts #sweeper ... expire_action article_posts_path(:article_id => post.article) # results in this Expired fragment: views//en/article/someid/posts (0.0ms) So this is almost ok, except the host is missing. What do I do that supplies this to the expire_action method? Thanks in advance.

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• My mobile does not cache , but i have a manifest file,...

  - by Ploetzeneder

  Hello, i have now put the site on: http://www.ploetzeneder.eu/Dateien/test/index4.html the manifest is there: http://www.ploetzeneder.eu/Dateien/test/app-cache-demo.manifest Why does it not work? The Webserver where the relevant problem has this url: http://www.pharao.mobi/WebAppproblem/ Username is the Username Passwort is the Password the problem is on index4.html where all images should be cached but are not

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• Asking browsers to cache as aggressively as possible

  - by balpha

  This is about a web app that serves images. Since the same request will always return the same image, I want the accessing browsers to cache the images as aggressively as possible. I pretty much want to tell the browser Here's your image. Go ahead and keep it; it's really not going to change for the next couple of days. No need to come back. Really. I promise. I do, so far, set Cache-Control: public, max-age=86400 Last-Modified: (some time ago) Expires: (two days from now) and of course return a 304 not modified if the request has the appropriate If-Modified-Since header. Is there anything else I can do (or anything I should do differently) to get my message across to the browsers? The app is hosted on the Google App Engine, in case that matters.

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• silverlight application deployment over IIS

  - by Piyush

  I have created an silverlight application (i have not selected my application to be hosted from another web application). Now I created a simple hello world page. I created virtual directory of my silverlight project in IIS for application hosting. 4. When I browse MainPage.xaml in loaclhost, it is not running. I think I shoul run the .xap file to host my application but I dont know haw??? OR Is it necessary to host a silverlight application from a .aspx page??

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• Can we view objets in the JVM memory?

  - by Sebastien Lorber

  Hey, At work we found that on some instances (particulary the slow ones) we have a different behaviour, acquired at the reboot. We guess a cache is not initialized correctly, or maybe a concurrency problem... Anyway it's not reproductible in any other env than production. We actually don't have loggers to activate... it's an old component... Thus i'd like to know if there are tools that can help us to see the different objets present in the JVM memory in order to check the content of the cache... Thank you!

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• Hashing a python function to regenerate output when the function is modified

  - by Seth Johnson

  I have a python function that has a deterministic result. It takes a long time to run and generates a large output: def time_consuming_function(): # lots_of_computing_time to come up with the_result return the_result I modify time_consuming_function from time to time, but I would like to avoid having it run again while it's unchanged. [time_consuming_function only depends on functions that are immutable for the purposes considered here; i.e. it might have functions from Python libraries but not from other pieces of my code that I'd change.] The solution that suggests itself to me is to cache the output and also cache some "hash" of the function. If the hash changes, the function will have been modified, and we have to re-generate the output. Is this possible or ridiculous? Updated: based on the answers, it looks like what I want to do is to "memoize" time_consuming_function, except instead of (or in addition to) arguments passed into an invariant function, I want to account for a function that itself will change.

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• Jsp cache problem

  - by idiotgenius

  I use javascript and css to build a multi-level drop down menu with following markups: <ul> <li>menu item 1</li> <ul> <li><a href="#">sub menu menu item 1</a></li> ................. This markup is generated by a custom JSTL tag <mui:menu .../> which loads menu data from a database. I hope my jsp page can behave like this: if menu data has not changed since last time I visited the page, just use browser's cache otherwise load from database... How can I do it? I don't know much detail about cache mechanism.

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• Controlling when SQL UPDATE is executing on ehcache 'd classes

  - by thomers

  We are using Hibernate and ehcache as 2nd level cache. If I load an entity that is cached (e.g. cache-usage="read-write") and update it, it seems that this immediately results in an SQL UPDATE. (How) Can I influence when this SQL UPDATE happens? hibSession = HibernateUtil.getReadWriteSession(); tx = hibSession.beginTransaction(); User u = (User) hibSession.load(User.class, user_id); u.modify(); hibSession.update(u); tx.commit(); Edit: It seems that setting a CacheMode should have an effect, but each hibSession.update() results in an immediate SQL UPDATE, regardless which CacheMode I set.

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• Difference between redirecting to a page and coming to the same page after pressing back button

  - by Mac

  Actually i have a page in which i am not using cache by using this code HttpContext.Current.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1)); HttpContext.Current.Response.Cache.SetValidUntilExpires(false); HttpContext.Current.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches); HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache); HttpContext.Current.Response.Cache.SetNoStore(); now i want to know is there any difference between coming to this page using a proper link or coming back using browser back button or is there any way to detect this.

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• AppFabric serialization problem.

  - by jandark

  I am trying cache a class instance with AppFabric but it return class instance with empty members. The reason is DataContract Attribute. My class is marked with [Serializable] and [DataContract(Name = "TestClass", Namespace = "CustomNameSpace.TestClass")] attributes. Problem solving if I mark all properties with DataMember or remove DataContract attribute. But I do not want to remove DataContract attributte because of other serialization needs (such as json or something else) Or I do not want to add DataMember attribute to other classes. (a lot of) Do you have any idea to solve that problem ? Thanks.

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• Cache JSP based on URL parameter

  - by Satheesh

  I have a jsp file pageshow.jsp and the parameter id, Is there any way to cache the jsp file in server-side based on the url parameter Requesting page pageshow.jsp?id=100 get from cache instead of building from server Requesting page pageshow.jsp?id=200 get from cache instead of building from server Above two pages should have different cache content since their parameter are different This may avoid the rebuilding the jsp file in server side and also decrease the server load

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• External Javascript file fails to receive variables from previous javascript block

  - by Franc

  I've been searching the net for several hours and can't find an answer in the whole "external js file"-jungle. I hope you guys can help! In short: My external javascript file doesn't seem to get the variables which I defined in the main.php file.. On main.php I define php variables and "transform" them into javascript variables <head>... <script type="text/javascript"> var phpmain_img = <?php echo json_encode($main_img); ?>; var phpvar1_large = <?php echo json_encode($var1_large); ?>; var phpvar2_large = <?php echo json_encode($var2_large); ?>; var phpvar3_large = <?php echo json_encode($var3_large); ?>; var phpvar4_large = <?php echo json_encode($var4_large); ?>; </script> ... <script language="javascript" type="text/javascript" src="/wshop/ext.js"></script> </head> In my ext.js file I want to process those variables. In the ext.js file I defined a the function swapImage() that will be used back in the main PHP: var imgArray = new Array( phpmain_img, phpvar1_large, phpvar2_large, phpvar3_large ); function swapImage(imgID) { var theImage = document.getElementById('theImage'); var newImg; newImg = imgArray[imgID]; theImage.src = newImg; } function preloadImages() { for(var i = 0; i < imgArray.length; i++) { var tmpImg = new Image; tmpImg.src = imgArray[i]; } } Result: The swapImage() in the main.php... doesnt work <div id="image"> <img id="theImage" src="<?=$main_img; ?>" alt="" /> </div> <div id="thumbs"> <?php echo "<img src=\"<$main_img_small\" alt=\"\" onmouseover=\"swapImage(0);\">"; echo "<img src=\"$var1_small\" alt=\"\" onmouseover=\"swapImage(1);\">"; echo "<img src=\"$var2_small\" alt=\"\" onmouseover=\"swapImage(2);\">"; echo "<img src=\"$var3_small\" alt=\"\" onmouseover=\"swapImage(3);\">"; ?> <br /> </div> Any help is greatly appreciated! UPDATE: I don't get a specific error, the swapImage functions doesn't work at mouseover. However, I tried to output the variables with e.g. document.write(phpimg_main) but nothing appears which makes me believe that there's something wrong with the handing over of the variables... here's the source code browser output `<html> <head> <link href="../demo.css" rel="stylesheet" type="text/css" /> <style type="text/css"> .... </style> <script type="text/javascript"> var phpmain_img = {"0":"http:\/\/path\/to\/main\/image.jpg"}; var phpvar1_large = {"0":"http:\/\/path\/to\/image1.jpg"}; var phpvar2_large = {"0":"http:\/\/path\/to\/image2.jpg"}; var phpvar3_large = null; var phpvar4_large = null; </script> <script language="javascript" type="text/javascript" src="/wshop/ext.js"></script> </head> <body onload="preloadImages()"> <div id="image"> <img id="theImage" src="http://path-to-main-image.jpg" alt="" /> </div> <div id="thumbs"> <img src="http://path-to-main-image.jpg" alt="" onmouseover="swapImage(0);"><img src="http://path-to-image1.jpg" alt="" onmouseover="swapImage(1);"><img src="http://path-to-image2.jpg" alt="" onmouseover="swapImage(2);"> <br /> </div> </body> `

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• How can I configure apigee to fail stale if the backend is unavialble?

  - by Anurag Kapur

  We have an API proxy configured with cache ttl of 2mins. Is it possible to configure apigee to serve stale cached content if the backend goes down so that our end users don't see errors? We would rather have our end users get copies of stale cached content (even after the configured ttl of 2mins expires) instead of errors when the backend goes down. Would appreciate if someone could point me to the relevant documentation if this is possible.

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• Enterprise Library Exception Handling Application Block

  - by Wilson

  Hi All, I have ExceptionPolicy, that catching all System.Exceptions. Now I have issue, how can I change that policy, to not catch FaultExceptions? Thanks

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• NoSQL replacement for memcache

  - by Juan Antonio Gomez Moriano

  We are having a situation in which the values we store on memcache are bigger than 1MB. It is not possible to make such values smaller, and even if there was a way, we need to persist them to disk. One solution would be to recompile the memcache server to allow say 2MB values, but this is either not clean nor a complete solution (again, we need to persist the values). Good news is that We can predict quite acurately how many key/values pair we are going to have We can also predict the total size we will need. A key feature for us is the speed of memcache. So question is: is there any noSQL replacement for memcache which will allow us to have values longer than 1MB AND store them in disk without loss of speed? In the past I have used tokyotyrant/cabinet but seems to be deprecated now. Any idea?

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• Offline Database Write Cache in C#

  - by Todd Gardner

  I have a windows service that receives a large amount of data that needs to be transformed and persisted to a database. To ensure that we do not lose data, I want to create a "Write cache" for the data that will continue regardless if the database is online. Once the database becomes available again, I would want it to flush the content of the cache back into the database. I've seen some articles indicating that I might be able to do this with NHibernate, but I haven't found it conclusively. What options exist for this, and is NHibernate the appropriate direction?

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• Best approach to cache Counts from SQL tables ?

  - by pixel3cs

  I would like to develop a Forum from scratch, with special needs and customization. I would like to prepare my forum for intensive usage and wondering how to cache things like User posts count and User replies count. Having only three tables, tblForum, tblForumTopics, tblForumReplies, what is the best approach of cache the User topics and replies counts ? Think at a simple scenario: user press a link and open the Replies.aspx?id=x&page=y page, and start reading replies. On the HTTP Request, the server will run an SQL command wich will fetch all replies for that page, also "inner joining with tblForumReplies to find out the number of User replies for each user that replied." select tblForumReplies.*, tblFR.TotalReplies from tblForumReplies inner join ( select IdRepliedBy, count(*) as TotalReplies from tblForumReplies group by IdRepliedBy ) as tblFR on tblFR.IdRepliedBy = tblForumReplies.IdRepliedBy Unfortunately this approach is very cpu intensive, and I would like to see your ideas of how to cache things like table Counts. If counting replies for each user on insert/delete, and store it in a separate field, how to syncronize with manual data changing. Suppose I will manually delete Replies from SQL.

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• Creating a "Universities Attended" Profile field/block (Drupal)

  - by Frank0051

  Interesting question for everyone. So I have am thinking of adding a "university attended" field to the profile page of members in Drupal. I guess I am trying to figure out the best way to go about it. I was originally thinking of a text field, but than I thought you could get multiple instances of of university names, making it hard to sort people by school (ie. UF, University of Florida, Florida, U of F, etc). I then began to think about creating a drop down, but I wasn't quite sure where I could get a listing of all the schools. Perhaps I could find a database population that a site like LinkedIn or Facebook uses. Then I thought of what happens when someone has attended multiple schools, how would I account for that? So, I guess I wanted to pose the question of how would you go about adding a University(ies) attended field to profile pages if you had to design a site to do so?

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• Delete cache when web browser is close.

  - by Edy Cu

  Hi all. I have issue about multiple login in asp.net. Case this happen: User X login as "user1" in web browser. Then user Y also login as "user1" also in another web browser. User Y got error message "Another user log in some account". That is work as expected. If X, close their web browser. Then try again to login in as "user1". X get also get "Another user log in some account". So i trying debug then i found session is remove when web browser is close, but cache still remaining in web browser. Anyone have idea about this how to clear cache when user close their browser, (not tab). Regard.

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• Jsoup to get data on <b> block

  - by Poh Sun

  I'm new to JSoup on Java and would like to enquire few questions. Given the HTML code of the page I would like to get is this <td width="70%" class="row1"> <b>4</b> <br />( 0 posts per day / 0.00% of total forum posts ) </td> My question here is I want to get the data 4 but the output I get is 4 ( 0 posts per day / 0.00% of total forum posts ) Here is my Java code Iterator <Element> element = totalPost.select("td[width=70%][class=row1]").iterator(); System.out.println(element.next().text()); Sorry if my question is not clear enough.

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• clear cached javascript includes in FireFox

  - by user151841

  I'm working on javascript for a site, developing with FireFox, and when I refresh the page, I don't see my changes. The javascript file is in an external file. I reloaded and refreshed the page several times, but the old javascript file was still cached. Finally, I loaded the javascript page in the browser directly, saw the old script, hit 'reload', and saw my changes. How can I clear cached external javascript files? I'll need to know this also when I tell the client that the changes are made, so that they aren't seeing the old cached functionality.

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• How to parse multiple dates from a block of text in Python (or another language)

  - by mlissner

  I have a string that has several date values in it, and I want to parse them all out. The string is natural language, so the best thing I've found so far is dateutil. Unfortunately, if a string has multiple date values in it, dateutil throws an error: >>> s = "I like peas on 2011-04-23, and I also like them on easter and my birthday, the 29th of July, 1928" >>> parse(s, fuzzy=True) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/pymodules/python2.7/dateutil/parser.py", line 697, in parse return DEFAULTPARSER.parse(timestr, **kwargs) File "/usr/lib/pymodules/python2.7/dateutil/parser.py", line 303, in parse raise ValueError, "unknown string format" ValueError: unknown string format Any thoughts on how to parse all dates from a long string? Ideally, a list would be created, but I can handle that myself if I need to. I'm using Python, but at this point, other languages are probably OK, if they get the job done. PS - I guess I could recursively split the input file in the middle and try, try again until it works, but it's a hell of a hack.

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• asp.net refresh part of page whit jquery when application state change

  - by Jeson Park

  i use Application property to count number of online users Application["OnlineUsers"] = (int)Application["OnlineUsers"] + 1; and then bind Application property value to HTML tag <div id="OnlineUser" > <span>Number of Online Users is <%=Application["OnlineUsers"].ToString() %></span> </div> when for example "user1" visit page,DIV tag show "Number of Online Users is 1" and "user2" visit page,DIV tag show "Number of Online Users is 2" but user1 still "Number of Online Users is 1" how do i refresh user1 page when user2 change application peroperty?

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• Problem with modifying a page with ajax, and the browser keeping the unmodified page in cache.

  - by David Lawson

  Hey there, I have a situation where my page loads some information from a database, which is then modified through AJAX. I click a link to another page, then use the 'back' button to return to the original page. The changes to the page through AJAX I made before don't appear, because the browser has the unchanged page stored in the cache. Is there a way of fixing this without setting the page not to cache at all? Thanks :)

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• How to drop a sortable block?

  - by Pentium10

  I have a list which is reordered using sortable. I defined a trash can div, and I want to achieve that when the blocks are dropped on this div to get deleted. So far I can't seam to fine the way to fire the drop event, when I release the item gets back to his previous position. I have this code: $(document).ready(function() { var order = null; $("#order-list").load(location.href+" #order-list>*",""); $("#order-list").sortable({ handle : '.handle', update : function (e, ui) { order = $(this).sortable('serialize'); $("#info").load("process-sortable.php?"+order); } }); }); and $("#trashcan").droppable({ drop: function(event, ui) { draggedid = ui.draggable.attr('id'); alert(draggedid); // doesn't fire $.get("process-add-subcat.php", { "action" : "delete_subcategory", "draggedid": draggedid }, function(data){ }); } });

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