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• locking database record for editing

  - by sd_dracula

  I have a SQL 2008 DB and an asp.net frontend. I would like to implement a lock when a user is currently editing a record but unsure of which is the best approach. My idea is to have a isLocked column for the records and it gets set to true when a user pulls that record, meaning all other users have read only access until the first user finishes the editing. However, what if the session times out and he/she never saves/updates the record, the record will remain with isLocked = true, meaning others cannot edit it, right? How can I implement some sort of session time out and have isLocked be automatically set to false when the session times out (or after a predefined period) Should this be implemented on the asp.net side or the SQL side?

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• starting subactivity for the second time causes java.lang.OutOfMemoryError

  - by Zacherl

  Hi there, I am developing a simple app which does a little bit of image-processing. It's divided in two activities; the main one with some display elements and the second one which is used to capture images off the phone's camera. To discribe my problem: I start the app, capture an image (by starting a new Intent with the subactivity) and all data is displayed correctly. If I capture another image after this, I run in an java.lang.OutOfMemoryError - bitmap size exceeds VM budget I dont store the captured bitmap, in the second activity I just extract some data from it and pass it to the main-activity; finishing (finish()) the sub-activity afterwards. I really dont know what I can do about it. Thanks in advance! greetings, Zacherl PS: It is my first approach to android, so I apologize for any stupid beginner error I did; if someone needs any further information, I would be happy to provide it.

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• Dependency Injection with @Inject in Weld (JSR-299 RI). How is the corresponding @Produces found?

  - by Thorbjørn Ravn Andersen

  I have played with the JSR-299 Reference Implementation "Weld" with the purpose of using it in a stand-alone application, and I have had a look at the documentation, and marveled at the magic. My question is how the producer of a given object to be @Inject'ed is found? Either the java compiler produces hints for annotations which is easily found by the classloader, or the complete classpath must be traversed loading all classes to see what they do which sounds highly inefficient to me, or it is a completely different approach. What is the trick?

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• browser cookie issue

  - by George2

  Hello everyone, In my previous understanding, for a web site, only login user of a web site (no matter what login/authentication approach is used) could have cookie as persistent identifier, so that if the user close the browser, open browser again to go to the same web site, the web site could remember the user. But I learned recently that it seems for non-login user, there could still be a cookie associated with the user (after the user close browser, and then open the browser again to go to the same web site, the web site could remember the user), and it is called browser cookie? Is that true? If it is true, who is responsible to set the browser cookie? i.e. need some coding/config at web server side, client browser configuration (without coding from server side), or both? How could web server access such cookie? Appreciate if any code samples. thanks in advance, George

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• Find valid assignments of integers in arrays (permutations with given order)

  - by evident

  Hi everybody! I am having a general problem finding a good algorithm for generating each possible assignment for some integers in different arrays. Lets say I have n arrays and m numbers (I can have more arrays than numbers, more numbers than arrays or as much arrays as numbers). As an example I have the numbers 1,2,3 and three arrays: { }, { }, { } Now I would like to find each of these solutions: {1,2,3}, { }, { } { }, {1,2,3}, { } { }, { }, {1,2,3} {1,2}, {3}, { } {1,2}, { }, {3} { }, {1,2}, {3} {1}, {2,3}, { } {1}, { }, {2,3} { }, {1}, {2,3} {1}, {2}, {3} So basically I would like to find each possible combination to assign the numbers to the different arrays with keeping the order. So as in the example the 1 always needs to come before the others and so on... I want to write an algorithm in C++/Qt to find all these valid combinations. Does anybody have an approach for me on how to handle this problem? How would I generate these permutations?

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• Advice on e-commerce logging strategy

  - by yalestar

  I recently inherited an e-commerce app (Java/Struts) that I'm porting to Rails. The thing is, we frequently have to do forensics on orders by poring through the log files, and with the old app's logs (log4j wall of text) it's pretty hard to make sense of the individual orders when several people are placing orders simultaneously. So I'm soliciting advice on a good strategy for logging of these orders, like maybe logging each individual order to its own MongoDB collection based on unique cart ID? Or maybe group them by IP address? Something different entirely? Essentially, what is the best approach for logging of an online store so that it's easy to backtrace each user's interaction with the site?

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• How do I execute a sequence of servlets?

  - by Legend

  I have some servlets that act as individual URLs for populating a database for some dummy testing. Something of the form: public class Populate_ServletName extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException { resp.setContentType("text/plain"); //Insert records //Print confirmation } } I have about 6 such servlets which I want to execute in a sequence. I was thinking of using setLocation to set the next page to be redirected but was not sure if this is the right approach because the redirects should happen after the records have been inserted. Specifically, I am looking for something like this: public class Populate_ALL extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException { resp.setContentType("text/plain"); //Call Populate_1 //Call Populate_2 //Call Populate_3 //... } } Any suggestions?

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• How to Command Query Responsibility Segregation (CQRS) with ASP.NET MVC?

  - by Jeffrey

  I have been reading about Command Query Responsibility Segregation (CQRS). I sort of wonder how would this work with ASP.NET MVC? I get the idea of CQRS conceptually it sounds nice and sure does introduce some complexities (event and messaging pattern) compared to the "normal/common" approach . Also the idea of CQRS sort of against the use of ORM in some ways. I am trying to think how I could use this pattern in the coming projects so if anyone has experience in combining CQRS with ASP.NET MVC and NHibernate please give some concrete examples to help me better understand CQRS and use with ASP.NET MVC. Thanks!

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• frequency of objects in an array using Ruby

  - by eastafri

  If i had a list of balls each of which has a color property. how can i cleanly get the list of balls with the most frequent color. [m1,m2,m3,m4] say, m1.color = blue m2.color = blue m3.color = red m4.color = blue [m1,m2,m4] is the list of balls with the most frequent color My Approach is to do: [m1,m2,m3,m4].group_by{|ball| ball.color}.each do |samecolor| my_items = samecolor.count end where count is defined as class Array def count k =Hash.new(0) self.each{|x|k[x]+=1} k end end my_items will be a hash of frequencies foreach same color group. My implementation could be buggy and i feel there must be a better and more smarter way. any ideas please?

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• Marionette multi user/roles application

  - by Fabrizio Fortino

  I have to build a pretty complex application using Backbone Marionette. The user interface has to handle multiple users with different roles. For example the 'admin' user will see the complete menu whereas the 'guest' user will access a subset of the same menu. Moreover some views will be accessible to all the users but the functions inside them (add, edit, delete) need to be profiled on the different roles. I am not sure about the right approach to use in order to solve this issue. I could have different templates for the different roles but in this case plenty of code will be duplicated inside them. Is there any best practice (or maybe some example) to sort my problem out using Marionette? Thanks in advance, Fabrizio

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• Import text file crunching library for Java/Groovy ?

  - by devdude

  In a lot of real life implementations of applications we face the requirement to import some kind of (text) files. Usually we would implement some (hardcoded?) logic to validate the file (eg. proper header, proper number of delimiters, proper date/time value,etc.). Eventually also need to check for the existence of related data in a table (eg. value of field 1 in text file must have an entry in some basic data table). While XML solves this (to some extend) with XSD and DTD, we end up hacking this again and again for proprietary text file formats. Is there any library or framework that allows the creation of templates similar to the xsd approach ? This would make it way more flexible to react on file format changes or implement new formats. Thanks for any hints Sven

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• bash: hwo to know NUM option in grep -A -B "on the fly" ?

  - by Michael Mao

  Hello everyone: I am trying to analyze my agent results from a collection of 20 txt files here. If you wonder about the background info, please go see my page, what I am doing here is just one step. Basically I would like to take only my agent's result out of the messy context, so I've got this command for a single file: cat run15.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' This means : after the regex match, continue forward by 50 lines, stop, then match a line separator starts with "==", go back by 50 lines, if possible (This would certainly clash the very first line). This approach depends on the fact that the hard-coded line number counter 50, would be just fine to get exactly one line separator. And this would not work if I do the following code: cat run*.txt | grep -A 50 -E '^Agent Name: agent10479475' | grep -B 50 '^==' The output would be a mess... My question is: how to make sure grep knows exactly when to stop going forward, and when to stop getting backward? Any suggestion or hint is much appreciated.

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• Use Google AppEngine datastore outside of AppEngine project

  - by Holtwick

  For my little framework Pyxer I would like to to be able to use the Google AppEngine datastores also outside of AppEngine projects, because I'm now used to this ORM pattern and for little quick hacks this is nice. I can not use Google AppEngine for all of my projects because of its's limitations in file size and number of files. A great alternative would also be, if there was a project that provides an ORM with the same naming as the AppEngine datastore. I also like the GQL approach very much, since this is a nice combination of ORM and SQL patterns. Any ideas where or how I might find such a solution? Thanks.

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• Hibernate: same generated value in two properties

  - by Markos Fragkakis

  Hi, I have an entity A with fields: aId (the system id) bId I want the first to be generated: @Id @Column(name = "PRODUCT_ID", unique = true, nullable = false, precision = 12, scale = 0) @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "PROD_GEN") @BusinessKey public Long getAId() { return this.aId; } I want the bId to be initially exactly as the aId. One approach is to insert the entity, then get the aId generated by the DB (2nd query) and then update the entity, setting the bId to be equal to aId (3rd query). Is there a way to get the bId to get the same generated value as aId? Note that afterwards, I want to be able to update bId from my gui. If the solution is JPA, even better.

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• Handle Transaction on differents EARs

  - by rfders

  Hello, what is the best practice to handle multiple EARs and the same transaction, as far as we know we need to apply XA concepts in order transaction works correctly. but apparently in currents project that we've been working on, this is not strictly necessary for creates and updates; however if we try to retrieve any collection from an entity we get an error that say there its not an active transaction or it was closed, but if we update Entity A in Ear A and update Entity B in Ear B it works perfectly when Entity A and Entity B has different datasources, at this point we are so confused about that, because we haven't configure any xa datasource yet. how is the best approach to work with this. transaction are handles by beans and not by the container and datasource are different between EAR A and EAR B

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• asp.net webservice user management across pages

  - by nakori

  I'm developing a site that will display confidential readonly information, with data fetched from a WCF service. My question: What is the best approach to user management across different information pages. The service returns a collection with customer info after a secure login. My idea is to have a Customer object class that is stored in session. Is it possible to use things like HttpContext.Current.User.Identity.IsAuthenticated followed by HttpContext.Current.Session["UserId"] without using a database with role-based security? Would I be better off with a combination of local database, Linq to SQL or datasets rather than using just class objects for data fetched from service? thanks, nakori

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• Implement a Cellular Automaton ? "Rule 110"

  - by ZaZu

  I was wondering how to use the Rule 110, with 55 lines and 14 cells. I have to then display that in an LED matrix display. Anyway my question is, how can I implement such automaton ?? I dont really know where to start, can someone please shed some light on how can I approach this problem ? Is there a specific METHOD I must follow ? Thanks --PROGRAM USED IS - C EDIT char array[54][14]; for(v=0;v<55;v++){ for(b=0;b<15;b++){ if(org[v][b-1]==0 && org[v][b]==0 && org[v][b+1] == 0) { array[v][b]=0; } array[v][b]=org[v][b]; } } Does that make sense ?? org stands for original

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• Android - Looking for an AOP solution

  - by Serj Lotutovici

  I'm writing an application that on the bottom line uses it's internal API for some manipulations. The problem is that to call any method provided by that class first I (or anybody who uses the API) have to call #prepare() and after that #cleanup(). It all worked fine until the application and the API started to grow. And the risk of not calling one of the supplied methods before or after the API is now to big to be ignored (which makes it a bug risky application). Searching for a solution I found this question. I use Google Guice in my app for other purposes, but Android doesn't support AOP, that's why a use only guice-no_aop-x.jar. So I end-up with two questions: Is there an AOP solution for android to implement the same approach that is shown in the link above? Or may be someone has an idea that will be suitable for my case? Thanks in advice!

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• Wordpress: Sort posts by meta value after AFTER querying from database

  - by Joseph Carrington

  Hello, I am pulling posts from my database by using Wordpress' WP_Query object like so: $shows_query = new WP_Query("category_name=shows&meta_key=band&meta_value=$artist_id"); I have another meta value I would like to sort the posts by, however. The meta key is 'date'. The WP_Query object can no work with multiple meta_keys, so this does not work: $shows_query = new WP_Query("category_name=shows&meta_key=band&meta_value=$artist_id&meta_key=date&orderby=meta_value&order=DESC"); So now I have to figure out a way to sort the posts in $shows_query['posts'] by one of their meta_values, which are not even IN their array. Any other, more sensible approach would also be appreciated.

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• Using thread inter-communication to increase my server app's IO throughput; not sure how

  - by Howard Guo

  My server application creates a new thread for each incoming connection. Incoming requests are serialized in a BlockingQueue. There is one worker thread taking items from the queue, produce a response and send the response through socket. I have noticed a throughput issue: Currently, worker thread is responsible of sending the response message through socket, thus severely wasting processing power and throughput. I am considering: rather than sending the response itself, why not telling network IO threads to send the response? However, when I think about thread inter-communication, I cannot yet figure out how to approach it: Worker thread will produce a response, but how will it inform the response message to IO thread? Is there a standard/best practice? Thank you.

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• Iphone & Web App synch

  - by Jack Welsh

  I am trying to build an Iphone App client for our CRM solution so our sales people would be able to access the information available in our CRM through an Iphone App. I am trying to find out what is the recommended approach to architect the application when it comes to the database. I am not sure where should the data reside, should I save a subset of the data on the iPhone, or should I just rely on webservices and pull the information I need from the database whenever I need it. Also, is there any best practices or frameworks to build such applications on the Iphone.

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• Serelization of a class and its sub-class....

  - by Amit

  There is a main class having 2 subClasses(each represent separate entity) and all classes needs to be serialized.. how should I proceed ? My requirement is when I serelize MainClass, I should get the xml for each sub class and main class as well. Thanks in advance... and if my approach is incorrect... correct that as well.. Ex given below... class MainClass { SubClass1 objSubclass1 = null; SubClass2 objSubclass2 = null; public MainClass() { objSubclass1 = new SubClass1(); objSubclass2 = new SubClass2(); } [XmlElement("SubClass1")] public SubClass1 SubClass1 {get {return objSubclass1;} } [XmlElement("SubClass2")] public SubClass2 SubClass2 {get {return objSubclass2;} } } Class SubClass1 { Some properties here... } Class SubClass2 { Some properties here... }

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• Scan from last instance of character to end of string using NSScanner

  - by Virgil Disgr4ce

  Given a string such as: "new/path - path/path/03 - filename.ext", how can I use NSScanner (or any other approach) to return the substring from the last "/" to the end of the string, i.e., "03 - filename.ext"? The code I've been trying to start with is: while ([fileScanner isAtEnd] == NO){ slashPresent = [fileScanner scanUpToString:@"/" intoString:NULL]; if (slashPresent == YES) { [fileScanner scanString:@"/" intoString:NULL]; lastPosition = [fileScanner scanLocation]; } NSLog(@"fileScanner position: %d", [fileScanner scanLocation]); NSLog(@"lastPosition: %d", lastPosition); } ...and this results in a seg fault after scanning to the end of the string! I'm not sure why this isn't working. Ideas? Thanks in advance!

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• LINQ to SQL: Issue with concurrency

  - by Gib

  I’m working on a sandwich ordering app in ASP.NET MVC, C# and LINQ to SQL. The app revolves around the user creating multiple custom-made sandwiches from a selection of ingredients. When it comes to confirming the order I need to know that there’s enough portions of each ingredient to fulfil all the sandwiches in the user’s order before I commit to the DB as it is possible that an ingredient will go out of stock between adding it to their basket and confirming the order. A bit about the database: Ingredient – Stores ingredient details including number of portions Order – Header table for an order, simply stores the order time OrderDetail – Stores a record of each sandwich in an order OrderDetailItem – Stores each ingredient in each sandwich in an order So basically I’m wondering what the best approach to ensuring that before I add records to Order, OrderDetail and OrderDetailItem I can ensure that the order can be met.

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• Automatically pulling on remote server with Git push?

  - by Vernon

  Here's what I'm trying to do: I have a GitHub repository, a portion of which I'd like to make web viewable. Right now I've cloned the repository on my own server and it works well, but in order to keep it up to date, I have to manually login and pull the latest changes. I'm not sure if this is the best idea (or the best approach), but I'd like the remote server to automatically pull whenever someone pushes to repository. GitHub makes it easy enough to run a script when someone pushes, but I'm not sure how to pull once someone does that. I was using PHP for simplicity, but just doing something like git pull naturally doesn't work because of permissions. Is this a bad idea or is there another way of achieving what I want to do? This seems like a common set up, but I wasn't sure. Thanks.

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