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  • How to perform an action when file changed?

    - by ZeissS
    Hi, I want to create a script that checks an URL and perform an action (download + unzip) when the "Last-Modified" header of the remote file changed. I thought about fetching the header with curl but then I have to store it somewhere for each file and perform a date comparison. Does anyone have a different idea using (mostly) standard unix tools? thanks

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  • Caching vector addition over changing collections

    - by DRMacIver
    I have the following setup: I have a largish number of uuids (currently about 10k but expected to grow unboundedly - they're user IDs) and a function f : id - sparse vector with 32-bit integer values (no need to worry about precision). The function is reasonably expensive (not outrageously so, but probably on the order of a few 100ms for a given id). The dimension of the sparse vectors should be assumed to be infinite, as new dimensions can appear over time, but in practice is unlikely to ever exceed about 20k (and individual results of f are unlikely to have more than a few hundred non-zero values). I want to support the following operations efficiently: add a new ID to the collection invalidate an existing ID retrieve sum f(id) in O(changes since last retrieval) i.e. I want to cache the sum of the vectors in a way that's reasonable to do incrementally. One option would be to support a remove ID operation and treat invalidation as a remove followed by an add. The problem with this is that it requires us to keep track of all the old values of f, which is expensive in space. I potentially need to use many instances of this sort of cached structure, so I would like to avoid that. The likely usage pattern is that new IDs are added at a fairly continuous rate and are frequently invalidated at first. Ids which have been invalidated recently are much more likely to be invalidated again than ones which have remained valid for a long time, but in principle an old Id can still be invalidated. Ideally I don't want to do this in memory (or at least I want a way that lets me save the result to disk efficiently), so an idea which lets me piggyback off an existing DB implementation of some sort would be especially appreciated.

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  • setAction for NSMatrix Not Working

    - by PF1
    Hi Everyone: I am attempting to call a function when any cell in a NSMatrix instance is selected. I am using the following code in order to accomplish this: [[cellArray objectAtIndex:0] setAction:@selector(testing:)]; [[cellArray objectAtIndex:1] setAction:@selector(testing:)]; However, when I toggle the selection of the two cells, the function isn't run. Is my method of setting the action of each cell incorrect, or is the problem located somewhere else? Thanks for any help.

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  • Is there a way to ignore Cache errors in Django?

    - by Josh Smeaton
    I've just set our development Django site to use redis for a cache backend and it was all working fine. I brought down redis to see what would happen, and sure enough Django 404's due to cache backend behaviour. Either the Connection was refused, or various other errors. Is there any way to instruct Django to ignore Cache errors, and continue processing the normal way? It seems weird that caching is a performance optimization, but can bring down an entire site if it fails. I tried to write a wrapper around the backend like so: class CacheClass(redis_backend.CacheClass): """ Wraps the desired Cache, and falls back to global_settings default on init failure """ def __init__(self, server, params): try: super(CacheClass, self).__init__(server, params) except Exception: from django.core import cache as _ _.cache = _.get_cache('locmem://') But that won't work, since I'm trying to set the cache type in the call that sets the cache type. It's all a very big mess. So, is there any easy way to swallow cache errors? Or to set the default cache backend on failure?

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  • Strategies on synching data and caching data between iphone and server

    - by Blankman
    Say I have a TODO list iphone app, that can be edited/viewed from both a web application and the iphone application. When on the iphone, when a user views all his todo lists, or sub-items, I would think that each time the user views a particular list it shouldn't be hitting the web applications API every-time, but rather cache locally the values and only hit the web when things change. What strategies are there for this type of scenerio?

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  • Dictionary w/ null key?

    - by Ralph
    Firstly, why doesn't Dictionary<TKey, TValue> support a single null key? Secondly, is there an existing dictionary-like collection that does? I want to store an "empty" or "missing" or "default" System.Type, thought null would work well for this. More specifically, I've written this class: class Switch { private Dictionary<Type, Action<object>> _dict; public Switch(params KeyValuePair<Type, Action<object>>[] cases) { _dict = new Dictionary<Type, Action<object>>(cases.Length); foreach (var entry in cases) _dict.Add(entry.Key, entry.Value); } public void Execute(object obj) { var type = obj.GetType(); if (_dict.ContainsKey(type)) _dict[type](obj); } public static void Execute(object obj, params KeyValuePair<Type, Action<object>>[] cases) { var type = obj.GetType(); foreach (var entry in cases) { if (entry.Key == null || type.IsAssignableFrom(entry.Key)) { entry.Value(obj); break; } } } public static KeyValuePair<Type, Action<object>> Case<T>(Action action) { return new KeyValuePair<Type, Action<object>>(typeof(T), x => action()); } public static KeyValuePair<Type, Action<object>> Case<T>(Action<T> action) { return new KeyValuePair<Type, Action<object>>(typeof(T), x => action((T)x)); } public static KeyValuePair<Type, Action<object>> Default(Action action) { return new KeyValuePair<Type, Action<object>>(null, x => action()); } } For switching on types. There are two ways to use it: Statically. Just call Switch.Execute(yourObject, Switch.Case<YourType>(x => x.Action())) Precompiled. Create a switch, and then use it later with switchInstance.Execute(yourObject) Works great except when you try to add a default case to the "precompiled" version (null argument exception).

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  • Caching images with asp/http

    - by Dmitry Makovetskiyd
    I want to cache all the images on my site, so I used this code: <%Response.AddHeader "Expires","Tue, 2 October 2013 00:00:00 GMT"%> The problem is that google says the images are not cached, whenever I go to this site: https://developers.google.com/speed/pagespeed Also in chrome, I can see that it gives a Get response for all the images. Why is that and how can I cache the images for the next year.

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  • ASP.Net MVC TimeSpan as action parameter?

    - by HeavyWave
    I am trying to use TimeSpan as a parameter type for an action in a controller, but the value is always now, so I presume it is not parsed correctly by MVC. The value that gets sent to it is "7:00 PM". Is it possible to make MVC support such format? I am using MVC 2.

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  • ASP.NET MVC 3 NOT showing appropriate view, action called using jquery

    - by TunAntun
    I have a small problem. My action is : public ViewResult SearchForRooms(int HotelDDL) { List<Room> roomsInHotel = bl.ReturnRoomsPerHotel(HotelDDL); return View(roomsInHotel); } Here is the jquery that is calling the action: <script type="text/javascript" language="javascript"> $(document).ready(function () { $("#HotelDDL").change(function () { var text = $("#HotelDDL option:selected").text(); var value = $("#HotelDDL option:selected").val(); alert("Selected text=" + text + " Selected value= " + value); $.post("/Home/SearchForRooms", { HotelDDL: $("#HotelDDL option:selected").val() }); }); }); </script> And finally, here is the View that should be called: @model IEnumerable<RoomReservation.Entities.Entities.Room> @{ ViewBag.Title = "Search"; } <h2>Result</h2> <table> <tr> <th> City </th> <th> Hotel </th> <th> Room label </th> <th> Number of beds </th> <th> Price per night </th> <th></th> </tr> @foreach (var item in Model) { <tr> <td> @Html.DisplayFor(modelitem=>item.Hotel.City.Name) </td> <td> @Html.DisplayFor(modelItem => item.Hotel.Name) </td> <td> @Html.DisplayFor(modelItem => item.Name) </td> <td> @Html.DisplayFor(modelItem => item.NumberOfBeds) </td> <td> @Html.DisplayFor(modelItem => item.PricePerNight) </td> </tr> } </table> Everthing is working ok (databse return all rooms correctly) except final view rendering. I have tried Phil's tool but it doesn't give me any suspicious hints: RouteDebug.RouteDebugger.RewriteRoutesForTesting(RouteTable.Routes); So, why is it not showing after jscript send it's post method to SearchForRooms()? Thank you P.S. If you need any other piece of code please just say so.

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  • What is the best way to prevent a webpage coded completely in HTML (no PHP or any server side langua

    - by racl101
    I thought by placing these two lines that it would prevent the page from being cached but this is not the case between the head tags: <meta http-equiv="pragma" content="no-cache" /> <meta http-equiv="cache-control" content="no-cache" /> As already mentioned this is on server that doesn't support PHP (or any server side language, well, that's not true, it has cgi-bin folder that supports perl scripts but I don't know perl and have no time to engage in it.) What else could I do to prevent the page from caching? It caches on Firefox and IE (and not so much in Chrome or Safari.)

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  • Caching result of SELECT statement for reuse in multiple queries

    - by Andrew
    I have a reasonably complex query to extract the Id field of the results I am interested in based on parameters entered by the user. After extracting the relevant Ids I am using the resulting set of Ids several times, in separate queries, to extract the actual output record sets I want (by joining to other tables, using aggregate functions, etc). I would like to avoid running the initial query separately for every set of results I want to return. I imagine my situation is a common pattern so I am interested in what the best approach is. The database is in MS SQL Server and I am using .NET 3.5.

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  • Disable action if textarea is empty

    - by mymlyn
    Could I somehow disable action (send, redirect) from submit if the textarea was empty (so nothing at all happens onclick). I want to avoid displaying error here, thats why I'm asking. My textarea: <textarea id="message" name="message" maxlength="35"></textarea> My submit button: <input id="send" type="image" src="/site_media/static/images/submit.png" value="Submit"> This is what i tried: http://jsfiddle.net/5Xwyb/ My brain died couple of hours ago.

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  • Extending appengine's db.Property with caching

    - by Noio
    I'm looking to implement a property class for appengine, very similar to the existing db.ReferenceProperty. I am implementing my own version because I want some other default return values. My question is, how do I make the property remember its returned value, so that the datastore query is only performed the first time the property is fetched? What I had is below, and it does not work. I read that the Property classes do not belong to the instances, but to the model definition, so I guess that the return value is not cached for each instance, but overwritten on the model every time. Where should I store this _resolved variable? class PageProperty(db.Property): data_type = Page def get_value_for_datastore(self, model_instance): page = super(PageProperty, self).get_value_for_datastore(model_instance) self._resolved = page return page.key().name() def make_value_from_datastore(self, value): if not hasattr(self, '_resolved'): self._resolved = Page.get_by_name(value) return self._resolved

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  • 'Caching' a large table in ASP.NET

    - by TheNewGuy
    I understand that each page refresh, especially in 'AjaxLand', causes my back-end/code-behind class to be called from scratch... This is a problem because my class (which is a member object in System.Web.UI.Page) contains A LOT of data that it sources from a database. So now every page refresh in AjaxLand is causing me to making large backend DB calls, rather than just to reuse a class object from memory. Any fix for this? Is this where session variables come into play? Are session variables the only option I have to retain an object in memory that is linked to a single-user and a single-session instance?

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  • MacPorts / Terminal: `Unrecognized action "sudo"`

    - by Chris
    I'm trying to install Image Magick on MAMP. And I'm seriously out of my depth. I've installed MacPorts, and opened the terminal. I've typed in sudo port -v selfupdate per the instructions on http://www.macports.org/install.php#pkg But the response I get from the Terminal is Unrecognized action "sudo" I've googled and googled, but can't find anything that makes a slab of sense. Any clever people feeling generous?

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  • How to track when my application has unexpectedly shut down?

    - by Vilx-
    I'm writing an application whose purpose involves a lot of logging of different events. Among those I would also like to have an event that the application was shut down - even if unexpectedly like because of a power loss. Naturally, when the power goes out I don't get a chance to write anything anywhere. So my idea was to continuously write a timestamp in some known location (say, once per minute), and when the application was next run, it could determine the approximate time of the unexpected shutdown. A precision of 1 minute would be acceptable for me. However I'm worried that caching at the OS and disk level might interfere with this approach. Is there a better way or if not - how to make sure that the data I just wrote is REALLY written out to the physical medium? Added: Oh, almost forgot the buzzword line: Windows XP and above; .NET 3.5; C#.

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  • avoid caching of page in browser

    - by Shan
    I am using an iframe to show the child pages.In that one one particular page contains hidden div and i am showing it as a pop-up like thing with javascript by changing the visibility of the hidden div. Problem is before showing the hidden div , some manipulations are done at server level and I am calling the div from C# code after the manipulations like Page.ClientScript.RegisterStartupScript(GetType(), "MyKey", "javascript:OpenModelPopup('cb','cs');", true); so the page is getting posted back and the div is shown. after this, after going to next page if i click browser back it shows that page with that hidden div and on next click of browser back gives the page without hidden div. but I want to show only the initial stage of the page ie. without showing the hidden div that stage with hidden div should not be cached or it should not be shown on click of browser back.

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  • javascript / jQuery variable problem (possibly caching issue)

    - by waitinforatrain
    Standard AJAX query with jQuery: var globalTitle = ""; var pages = ["a", "b", "c"]; for (var i = 0; i < pages.length; i++) { createpage(pages[i]); } function createpage(title) { globalTitle=title; console.log (globalTitle); //All looks good here $.ajax({ url: "createpage.php?id=" + title, context: document.body, success: success }); } The success() function uses globaltitle which is why I had to declare it global. In the success() function though console.log (globalTitle); constantly gives me "a". It's like the variable is assigned but is then cached every time success() is called. Happens in FF 4 and Chrome 8. Any thoughts?

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  • Struts 2 + Reading values from the action

    - by Panther24
    I writing a Struts 2 application. The main operation I'm trying now is to read from the action call a List and display it in the form of a table in the JSP. I've searched the net and check out a lot of examples, but in vain. Can someone point out to a good working example?

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