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  • Event sourcing: Write event before or after updating the model

    - by Magnus
    I'm reasoning about event sourcing and often I arrive at a chicken and egg problem. Would be grateful for some hints on how to reason around this. If I execute all I/O-bound processing async (ie writing to the event log) then how do I handle, or sometimes even detect, failures? I'm using Akka Actors so processing is sequential for each event/message. I do not have any database at this time, instead I would persist all the events in an event log and then keep an aggregated state of all the events in a model stored in memory. Queries are all against this model, you can consider it to be a cache. Example Creating a new user: Validate that the user does not exist in model Persist event to journal Update model (in memory) If step 3 breaks I still have persisted my event so I can replay it at a later date. If step 2 breaks I can handle that as well gracefully. This is fine, but since step 2 is I/O-bound I figured that I should do I/O in a separate actor to free up the first actor for queries: Updating a user while allowing queries (A0 = Front end/GUI actor, A1 = Processor Actor, A2 = IO-actor, E = event bus). (A0-E-A1) Event is published to update user 'U1'. Validate that the user 'U1' exists in model (A1-A2) Persist event to journal (separate actor) (A0-E-A1-A0) Query for user 'U1' profile (A2-A1) Event is now persisted continue to update model (A0-E-A1-A0) Query for user 'U1' profile (now returns fresh data) This is appealing since queries can be processed while I/O-is churning along at it's own pace. But now I can cause myself all kinds of problems where I could have two incompatible commands (delete and then update) be persisted to the event log and crash on me when replayed up at a later date, since I do the validation before persisting the event and then update the model. My aim is to have a simple reasoning around my model (since Actor processes messages sequentially single threaded) but not be waiting for I/O-bound updates when Querying. I get the feeling I'm modeling a database which in itself is might be a problem. If things are unclear please write a comment.

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  • Is there a future for Powerpoint VBA/VSTO?

    - by Sam Russo
    Does anyone know what the future holds for VBA/VSTO programming in Powerpoint? I've been working on a Office automation project and find it frustrating to work with Powerpoint in particular since it seems to be one level below VBA support found in Excel or Word. It feels like MS is trying to phase out support for VBA in PPT since they dropped macro recording in version 2007 and the object model lacks some key features support.

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  • What happens with TCP packets between 2 Socket.BeginReceive Call??

    - by Rodrigo
    Hi, i have a doubt about Socket Programming, i am developing a TCP packets Sniffer, i am using Socket.BeginAccept, Socket.BeginReceive to capture every packet, but when a packet is received i have to process something, it is a fast operation, but would take some milliseconds, and then call the BeginReceive again. My question is, what would happen if some packets are sent while i am processing, and havent called BeginReceive??...are lost?...are buffered internally?...is there a limit?... Thanks in advance.

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  • Windows Flash CS2 font not showing?

    - by ricky roy
    Hi, I Installed the font into my system/font folder. But font is not showing. Font is showing in the word document but will not showing in the flash. Will you plz give me solutions. I am waiting for your response. Thanks & regards, Basant..

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  • What is the mysql 5.5 equivalent for the sys.dm_fts_index_keywords_by_document in sql 2008

    - by djsurge
    I'm making a web application that uses the data in the sys.dm_fts_index_keywords_by_document. I'm interested how many times a given term occurs in each string that is indexed. For example, I have a table with a column called comments, the table has various strings in the comments field. When I make that column full text searchable, the dm_fts_index_keywords_by_document is created and I can see the word per document data. Can i do the same thing in mySQL?

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  • Listings in Latex with UTF-8 (or at least german umlauts)

    - by Janosch
    Trying to include a source-file into my latex document using the listings package, i got problems with german umlauts inside of the comments in the code. Using \lstset{ extendedchars=\true, inputencoding=utf8x } Umlauts in the source files (encoded in UTF-8 without BOM) are processed, but they are somehow moved to the beginning of the word they are contained in. So // die Größe muss berücksichtigt werden in the input source file, becomes // die ößGre muss übercksichtigt werden in the output file. NOTE: since i found errors in my initial setup, i heavily edited this question

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  • From SEO point of view, is it better to use Domain-Dash.com or Domainwithoutdash.com?

    - by Msc. Adrian Lopez
    I have been reading forums and so, but found not a clear answer or nor conclusive, about the strategic decission of using domain-with-dash.com or notusingdashes.com Is there a problem or disadvantage in ranking for those key words? Is it better having the-domain-with-dash.com than shortdomain.net? many cases you dont have the dot.com available for that specific key word. what are your opinions, please prove facts, or add links to the source. What Google has to say?

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  • Emacs statusbar documentation

    - by User1
    There are a lot of abbreviations on the emacs status bar and no good way to decode them. This article was the most helpful. I could not find the word "status bar" in the Emacs manual. Does anyone know where I could find descriptions of how that status bar works?

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  • Max file size for File.ReadAllLines

    - by user283897
    Hi, I need to read and process a text file. My processing would be easier if I could use the File.ReadAllLines method but I'm not sure what is the maximum size of the file that could be read with this method without reading by chunks. I understand that the file size depends on the computer memory. But are still there any recommendations for an average machine? I would greatly appreciate your fast response. Thanks, Lev

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  • What exactly is a Class Factory?

    - by Olaseni
    I see the word thrown around often, and I may have used it myself in code and libraries over time, but I never really got it. In most write-ups I came across, they just went on expecting you to figure it out. What is a Class Factory? Can someone explain the concept?

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  • Plotting in Matlab

    - by papaduke
    How do you plot two figures at the same time in Matlab? Every time I use surf() it plots over the old one. Also, how do you save the images so you can export them to MS word or powerpoint or something?

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  • PHP Form Security With Referer

    - by Jascha
    I'm putting together a site that will make itself available for user input. I was wondering if writing a function like: if(getenv("HTTP_REFERER") != 'http://www.myURL.com/submitArea'){ die('don\'t be an jerk, ruin your own site'); }else{ // continue with form processing } is enough to prevent cross site form submissions.

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  • Splitting input into substrings in PIG (Hadoop)

    - by Niels Basjes
    Assume I have the following input in Pig: some And I would like to convert that into: s so som some I've not (yet) found a way to iterate over a chararray in pig latin. I have found the TOKENIZE function but that splits on word boundries. So can "pig latin" do this or is this something that requires a Java class to do that?

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  • itextsharp PdfCopy and landscape pages

    - by Andreas Rehm
    I'm using itextsharp to join mutiple pdf documents and add a footer. My code works fine - except for landscape pages - it isn't detecting the page rotation - the footer is not centerd for landscape: public static int AddPagesFromStream(Document document, PdfCopy pdfCopy, Stream m, bool addFooter, int detailPages, string footer, int footerPageNumOffset, int numPages, string pageLangString, string printLangString) { CreateFont(); try { m.Seek(0, SeekOrigin.Begin); var reader = new PdfReader(m); // get page count var pdfPages = reader.NumberOfPages; var i = 0; // add pages while (i < pdfPages) { i++; // import page with pdfcopy var page = pdfCopy.GetImportedPage(reader, i); // get page center float posX; float posY; var rotation = page.BoundingBox.Rotation; if (rotation == 0 || rotation == 180) { posX = page.Width / 2; posY = 0; } else { posX = page.Height / 2; posY = 20f; } var ps = pdfCopy.CreatePageStamp(page); var cb = ps.GetOverContent(); // add footer cb.SetColorFill(BaseColor.WHITE); var gs1 = new PdfGState {FillOpacity = 0.8f}; cb.SetGState(gs1); cb.Rectangle(0, 0, document.PageSize.Width, 46f + posY); cb.Fill(); // Text cb.SetColorFill(BaseColor.BLACK); cb.SetFontAndSize(baseFont, 7); cb.BeginText(); // create text var pages = string.Format(pageLangString, i + footerPageNumOffset, numPages); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, printLangString, posX, 40f + posY, 0f); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, footer, posX, 28f + posY, 0f); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, pages, posX, 20f + posY, 0f); cb.EndText(); ps.AlterContents(); // add page to new pdf pdfCopy.AddPage(page); } // close PdfReader reader.Close(); // return number of pages return i; } catch (Exception e) { Console.WriteLine(e); return 0; } } How do I detect the page rotation (e.g. landscape) format in this case? The given example works for PdfReader but not for PdfCopy. Edit: Why do I need PdfCopy? I tried copying a word pdf export. Some word hyperlinks will not work when you try to copy pages with PdfReader. Only PdfCopy transfers all needed page informations. Edit: (SOLVED) You need to use reader.GetPageRotation(i);

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  • How to pass output of a linq query to another form in C#

    - by Ani
    I have a Linq query and I want to pass the ouput (userid) to another form for further processing. var userid = from auser in allusers.Users where auser.Username == nameString select new { id = auser.UserId }; so only 'UserId' is stored in variable 'userid' and I want to use this value in another form. Is there any way we can do this. Thanks, Ani

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  • Opening Dot File with OpenXML

    - by OpenXML123
    Hi, I need to work on opening a DOT (word document template) file, replace the fillers and save it as Document file. On opening DOT file I am getting "Document File is Corrupted". Is it possible to work with DOT file using OpenXML.

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  • Tagging in rails with is_taggable

    - by poseid
    there is an example provided on how to add tags to a model with is_taggable, and it works very nice (working in 5 minutes) Now, I also need the opposite, show all records that are tagged with a certain word. Something like: ModelWithTag.find_by_tags "foo" or find_all_tagged_with "foo" Is this possible with is_taggable ?

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  • ScrollView containing TextView does not scroll

    - by Dave Allison
    I have a textview displaying many individual words, each word is a link using Spans and setMovementMethod(LinkMovementMethod.getInstance()); The textview is wrapped by a ScrollView. However the ScrollView does not work as the links in the TextView are activated instead. Is there a way to combine a ScrollView and TextView so that both the scrolling and links in the text work?

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