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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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  • iPhone app distribution build warning

    - by shreya
    Hi All, I build my app with distribution profile. Every thing goes fine except one warning, warning: 'The Validate Built Product build setting was not enabled when building for Distribution.' I find it on Google but get nothing. Is this warning affect my distribution build.? Can some one explains what that warning means.? I followed all steps mentioned at developer portal. Thanks In Advance.

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  • How do I register a server side click on an HTMLGenericControl?

    - by Brian Scott
    I'm looking for a reliable mechanism to generate a server side postback handler for an HTMLGenericControl such as an . I have some markup that I do not wish to change and would prefer to treat this in the same fashion as a standard .Net server control. Also, I know I can use a template based control to place some .Net controls within the markup as hidden and then trigger their click events from a client side click proxy. However, I'm really enquiring as to whether this can be done better.

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  • what is and how to Whitelisted desktop facebook

    - by user63898
    hello all my desktop application that invoking FQL query's , for the first time im loged in as different user ( not the developer user ) and im getting this error massage : "error_code":606 : xxxx is not permitted to requested mailbox permissions from xxxxxx from reading i know i need to Whitelist my desktop app , but now one tells how ??

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  • deploying WAMP -> live site - any random tips?

    - by Haroldo
    In the next few weeks I'll be taking my site from the localhost (WAMP) and puting it on a new server. This will be the first site, on my first server, so basically...i'm a noob! This must be an important moment for any independent web developer / small business so i'd love to hear about some experiences, mistakes and system default security holes that one should fix straight away... I'm using php, mysql, cpanel and WHM, and looking for tips like "Turn off error reporting in PHP"

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  • Is SOA good for us?

    - by afsharm
    Hi there, We are a 5 developer team that are going to create a 150-200 table application. This is supposed to be written in C#, ASP.NET, MS SQL. Is SOA a good architecture for us? If yes, what type of it is better to us?

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  • Not Jailbroken - getting Provisioning is not applicable for product type 'Application' in SDK Device

    - by quantumpotato
    Codesign warning: provisioning is not applicable for product type 'Application' in SDK Device - iPhone OS3.1'; ignoring.. Redownloaded my developer certificate, made a new provisioning profile, still getting this error. Searched the Xcode project and removed all lines referencing a Provisioning Profile, but that didn't seem to remove it from the project settings (went to show package contents, then opened the project file). Was originally on a different machine then transferred over, if that makes a difference? Thanks

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  • Website revision control system

    - by kylex
    I'm looking for the ability to use a revision control system for websites, but ALSO have the revisions go live immediately. Example: A developer submits to the repository, those changes are live immediately pulled from the repository. Any suggestions on available software?

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  • Who makes software validation? What are the steps of its?

    - by uzay95
    Fill in the X,Y,Z please. Software validation has X,Y,Z steps. Client have to provide X,Y,Z to the developer before starting to write software. When software finished, validation completes with doing X,Y,Z (sign, approval, test pictures, logs etc.). If we buy a general software like invoice management tool or SAP module which can modify/change for every customer, who should make the software validation?

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  • How to convert <font size="10"> to px?

    - by marknt15
    Hi, I need to convert <font size="10"> to px. Example only(not correct): <font size="10"> is equivalent to 12px. Is there any formula or table conversion out there to convert <font size="10"> to px? Thanks :) Kind Regards, Mark PHP Developer from Philippines

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  • Finding the closest object in proxmity to the mouse Coordinates

    - by Cam
    Hey there, i've been working on a problem for a while now, which involves targeting the closest movieClip in relation to the x y coords of the mouse, I've attached a nice little acompanying graphic. Each mc added to the stage has it's own sub-class (HotSpots) which uses Pythag to measure distance from mouse. At this stage i can determine the closest value from my Main class but can't figure out how to reference it back to the movieclip... hope this makes sense. Below are the two Classes. My Main Class which attachs the mcs, and monitors mouse movement and traces closest value package { import flash.display.*; import flash.text.*; import flash.events.*; public class Main extends MovieClip { var pos:Number = 50; var nodeArray:Array; public function Main(){ nodeArray = []; for(var i:int = 0; i < 4; i++) { var hotSpot_mc:HotSpots = new HotSpots; hotSpot_mc.x += pos; hotSpot_mc.y += pos; addChild(hotSpot_mc); nodeArray.push(hotSpot_mc); // set some pos pos += 70; } stage.addEventListener(MouseEvent.MOUSE_MOVE,updateProxmity) } public function updateProxmity(e:MouseEvent):void { var tempArray:Array = new Array(); for(var i:int = 0; i < 4; i++) { this['tf'+[i]].text = String(nodeArray[i].dist); tempArray.push(nodeArray[i].dist); } tempArray.sort(Array.NUMERIC); var minValue:int = tempArray[0]; trace(minValue) } } } My HotSpots Class package { import flash.display.MovieClip; import flash.events.Event; import flash.text.TextField; public class HotSpots extends MovieClip { public var XSide:Number; public var YSide:Number; public var dist:Number = 0; public function HotSpots() { addEventListener(Event.ENTER_FRAME, textUp); } public function textUp(event:Event):void { XSide = this.x - MovieClip(root).mouseX; YSide = this.y - MovieClip(root).mouseY; dist = Math.round((Math.sqrt(XSide*XSide + YSide*YSide))); } } } thanks in advance

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  • set the focus on the scroller when button is clicked

    - by liz
    hi i have a script <script type="text/javascript"> window.addEvent('domready', function(){ var totIncrement = 0; var increment = 560; var maxRightIncrement = increment*(-6); var fx = new Fx.Style('slider-list', 'margin-left', { duration: 1000, transition: Fx.Transitions.Back.easeInOut, wait: true }); //------------------------------------- // EVENTS for the button "previous" $('previous').addEvents({ 'click' : function(event){ if(totIncrement<0){ totIncrement = totIncrement+increment; fx.stop() fx.start(totIncrement); } } }); //------------------------------------- // EVENTS for the button "next" $('next').addEvents({ 'click' : function(event){ if(totIncrement>maxRightIncrement){ totIncrement = totIncrement-increment; fx.stop() fx.start(totIncrement); } } }) }); </script> in mootools v1.1 it makes a scroller function at the bottom of my html page. but when i click the next button the page's focus moves to the top of the page. how do i keep it on the scroller? this is the html fragment: <h3>Our Pastas</h3> <div id="slider-buttons"> <a href="#" id="previous">Previous</a> | <a href="#" id="next">Next</a&gt; </div> <div id="slider-stage"> <ul id="slider-list"> <li class="list_item"> <div id="thumbnail"><a href="xxx/product-catalog/pasta/long-pasta-in-brown-bags/bucatini"><img src="xxx/images/stories/products/_thumb1/bucatini.gif"></a></div><h4><a href="xxx/product-catalog/pasta/long-pasta-in-brown-bags/bucatini">Rustichella d'Abruzzo Bucatini</a></h4> </li> <li class="list_item"> <div id="thumbnail"><a href="xxx/product-catalog/pasta/pasta-in-trays/calamarata"><img src="xxx/images/stories/products/_thumb1/calamarata.jpg"></a></div><h4><a href="xxx/product-catalog/pasta/pasta-in-trays/calamarata">Rustichella d'Abruzzo Calamarata</a></h4> </li> <li class="list_item"> <div id="thumbnail"><a href="xxx/product-catalog/pasta/pasta-in-trays/cannolicchi"><img src="xxx/images/stories/products/_thumb1/cannolicchi.jpg"></a></div><h4><a href="xxx/product-catalog/pasta/pasta-in-trays/cannolicchi">Rustichella d'Abruzzo Cannolicchi</a></h4> </li> </ul></div>

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  • Routing and Membership

    - by Curtis White
    I have a page that uses routing and it works fine under Visual web developer. But when I deployed to IIS 7. The page that uses routing doesn't seem to recognize the user is logged in. I think I read about this but had not seen it until now. Hope there is a fix! Environment deployed too is ASP.NET 3.5 SP1, SQL SERVER 2008, and IIS 7 integrated. Thanks.

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  • Convert a Delphi example using TDatabase and local paradox table to server storage

    - by Brian Frost
    I am looking at the Developer Express Quantum Grid example 'IssueList' which is a useful bug reporting and tracking application that's almost ready to go out of the box. It uses a TDatabase component with several paradox (.db) tables. Is it simple to rejig the TDatabase settings to use a database on a shared machine so that several of us can access it together across the network? If so, what would be the steps needed please?

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  • Django OR Rails

    - by Mahesh
    Its not the another language debate, its a decision making discussion. I am a ASP.NET developer, but want to learn other frameworks/language (open source). I don't know from where i should start and why? Django and Rails both seems promising, but i am confused which one i should choose to start, or i should choose some other framework. I know learning the language (python or ruby) is must before start Django or Rails. Please advise.

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  • Developing a custom-validation in asp.net for specific control and criteria

    - by Gaurav
    Hello There is another relevant question asked Validation Check in asp.net In the same scenario we need a custom validator control which will alert user for any wrong entry. This will work like this : Developer will pass the control-name, input-value and format-required For instance like for textbox it can be: txtName,txtName.Text, allow-alphabets-only The accordingly format if the user input is invalid he/she will be got prompt. Please suggest the right way to do the smae. Thanks in advance.

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  • Can i openly speculate based on App rejection that the iPad has xxx MB of memory?

    - by GamingHorror
    If i were to calculate the iPad's amount of RAM based on just the one fact that my iPad App got rejected due to memory warnings twice, and me fixing it, would this violate the developer NDA? Obviously i know how much memory my App uses, how much the iPhone OS is likely to use and estimate the amount reserved for video memory, then i can deduct from that that the iPad has xxx MB of memory. I just wonder if i can say that number publicly without violating any NDA?

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  • CFBundleDocumentTypes & UIFileSharingEnabled issues

    - by carloe
    Has anyone gotten UIFileSharingEnabled or CFBundleDocumentTypes to work? I added UIFileSharingEnabled as true to my plist and used Apple's example from the link below for CFBundleDocumentTypes, but can't seem to get it to work. I don't see my app under file sharing in iTunes, and I do not get the option to open documents I registered in my app when I click on them in the mail.app http://developer.apple.com/iphone/library/documentation/General/Conceptual/iPadProgrammingGuide/CoreApplication/CoreApplication.html

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  • Sql Profiler Scan Started to execute a stored procedure

    - by Lieven Cardoen
    Does SqlServer has to start a Scan to execute a stored procedure? In Sql Profiler I can see this: RPC Starting ( exec sp_Edu3_SelectExamSession @ExamSessionId=N'AccessCode39361814' ) Scan:Started Scan:Started Scan:Started RPC Completed ( exec sp_Edu3_SelectExamSession @ExamSessionId=N'AccessCode39361814' ) Can I somehow see what's happening in the Stored Procedure? Different queries are done in that SP, but they do not seem to appear in Sql Profiler (maybe I need to check some more events?) The Scan:Started are probably scans by the queries in the sp? Or not?

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  • How to develop an AAC converter for Linux?

    - by Arnab
    Hi, I am a beginner developer want to develop a MP3 to AAC converter for Linux. But I don't know how to start as I havn't done any development in Linux before. I am using Ubuntu 10.04. Can anyone tell me how to start and from where? What libraries do I need? Thanks

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  • What offers for Microsoft MVP and RD do you know from third-part companies?

    - by sashaeve
    Some companies propose there products and services for Microsoft Most Valuable Professionals and Microsoft Regional Directors for free or with discounts. I can list some of them: JetBrains (ReSharper) Altova (XmlSpy) TechSmith (Camtasia Studio) Telerik (ASP.NET controls and OpenAccess ORM) Developer Express (controls) PluralSightgives (free subscription) SpeakFlow (service) What another offers do you know?

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  • Why the proliferation of open source licenses?

    - by dwj
    Is the proliferation of open source licenses just another example of programmers living NYI (Not Invented Here) syndrome? I know there are some big differences between some of the big licenses (e.g., GPL, Apache, BSD) but when you start looking to see many projects creating their own licenses. Why? References: http://en.wikipedia.org/wiki/Open_source_licenses http://developer.kde.org/documentation/licensing/licenses_summary.html

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