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• Choosing between Berkeley DB Core and Berkeley DB JE

  - by zokier

  I'm designing a Java based web-app and I need a key-value store. Berkeley DB seems fitting enough for me, but there appears to be TWO Berkeley DBs to choose from: Berkeley DB Core which is implemented in C, and Berkeley DB Java Edition which is implemented in pure Java. The question is, how to choose which one to use? With web-apps scalability and performance is quite important (who knows, maybe my idea will become the next Youtube), and I couldn't find easily any meaningful benchmarks between the two. I have yet to familiarize with Cores Java API, but I find it hard to believe that it could be much worse than Java Editions, which seems to be quite nice. If some other key-value store would be much better, feel free to recommend that too. I'm storing smallish binary blobs, and keys probably will be hashes of the data, or some other unique id.

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• Silverlight Threading and its usage

  - by Harryboy

  Hello Experts, Scenario : I am working on LOB application, as in silverlight every call to service is Async so automatically UI is not blocked when the request is processed at server side. Silverlight also supports threading as per my understanding if you are developing LOB application threads are most useful when you need to do some IO operation but as i am not using OOB application it is not possible to access client resource and for all server request it is by default Async. In above scenario is there any usage of Threading or can anyone provide some good example where by using threading we can improve performance. I have tried to search a lot on this topic but everywhere i have identified some simple threading example from which it is very difficult to understand the real benefit. Thanks for help

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• Difference between Thread.Sleep(0) and Thread.Yield()

  - by Xose Lluis

  As Java has had Sleep and Yield from long ago, I've found answers for that platform, but not for .Net .Net 4 includes the new Thread.Yield() static method. Previously the common way to hand over the CPU to other process was Thread.Sleep(0). Apart from Thread.Yield() returning a boolean, are there other performance, OS internals differences? For example, I'm not sure if Thread.Sleep(0) checks if other thread is ready to run before changing the current Thread to waiting state... if that's not the case, when no other threads are ready, Thread.Sleep(0) would seem rather worse that Thread.Yield().

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• Sha or Md5 algorithm i need to encrypt and decrypt in flex

  - by praveen

  Hi I am developing my application in flex and JSP, so when I am passing values through HTTP Service Post method with request object but these values are tracing and modifying by testing team so I am planning to encrypt values in flex and decrypt it in jsp.so is there any algorithms like SHA or MD5 more secure algorithms, so please send any code or related links it is very useful to me. I am using like httpService = new HTTPService; httpService.request = new Object; httpService.request.task = "doInvite"; httpService.request.email = emailInput.text; httpService.request.firstName = firstNameInput.text; httpService.request.lastName = lastNameInput.text; httpService.send(); So is there any other way to give more secure ,please help me in this,Thanks in Advance.

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• Returning IQueryable or Enumerated Object

  - by Tarik

  Hello everyone, I was wondering about the performance difference between these two scenarios and what could the disadvantages be over each other? First scenario : public class Helper //returns IQueryable { public IQueryable<Customer> CurrentCustomer { get{return new DataContext().Where(t=>t.CustomerId == 1); } } public class SomeClass { public void Main() { Console.WriteLine(new Helper().CurrentCustomer.First().Name; } } The second scenario : public class Helper //returns Enumerated result { public Customer CurrentCustomer { get{return new DataContext().First(t=>t.CustomerId == 1); } } public class SomeClass { public void Main() { Console.WriteLine(new Helper().CurrentCustomer.Name; } } Thanks in advance.

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• web2py or grok (zope) on a big portal,

  - by Robert

  Hi, I am planning to make some big project (1 000 000 users, approximately 500 request pre second - in hot time). For performance I'm going to use no relational dbms (each request could cost lot of instructions in relational dbms like mysql) - so i can't use DAL. My question is: how web2py is working with a big traffic, is it work concurrently? I'm consider to use web2py or Gork - Zope, How is working zodb(Z Object Database) with a lot of data? Is there some comparison with object-relational postgresql? Could you advice me please.

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• Filesize with SWFUpload and Amazon S3

  - by Dodinas

  Hello all, I'm currently using SWFUpload to upload files to my S3 bucket. And it's working great. I'm using the script from a website here: http://www.anedix.com/news/article/50 Again, the upload to my S3 works fine, however, I've been running into an issue when attempting to upload larger files. It seems that I cannot upload anything over 50MB. I have tried this from both my webhost and locally, using my local testing environment. My question is this: When uploading with SWFUpload, it should be going straight to Amazon S3, correct? If so, then PHP settings such as MAX_UPLOAD_SIZE should not affect it? (Even though in my local environment, I've set it to 1024MB.) Essentially, what the script does is, shows that it's uploading the file (it takes the appropriate amount of time), redirects to the success page, and does not throw any errors. Any ideas on why this would be happening, or how I can troubleshoot this? Thanks!

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• Internet Explorer SPAN style issue when Input button is removed

  - by Evan

  Internet Explorer does not remove the extra padding from my button when the input button is missing. The input button will sometimes be missing, because on a dynamic page the button will sometimes be hidden. See my example using Internet Explorer when viewing my demo link: http://media.apus.edu/it/evan-testing/form.htm I tested this in Firefox, Safari, Chrome, etc. and all browsers have my style completely removed if the form button is missing. edit It was asked what internet explorer version does this happen in and it occurs in ie7. It works just fine in IE8. Any hacks for this for IE7 then?

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• Finding the Geo-location on a Blackberry?

  - by Frederico

  I'm running into an issue when trying to geolocate users whom are using blackberry devices. Currently there are a few checks that I go through to geolocate the individual the first, using the navigator paramater inside browsers. if(navigator.geolocation) if this fails then I have a backup using a free service (for testing) from maxmind: See Here Yet this doesn't return back the city at all either. I've then tried using the JSPI that google maps proviedes, and echoing out the google.loader.ClientLocation: if (google.loader.ClientLocation != null) { document.write("Your Location Is: " + google.loader.ClientLocation.address.city + ", " + google.loader.ClientLocation.address.region + " lat: " + google.loader.ClientLocation.latitude + " Long: " + google.loader.ClientLocation.longitude); } else { document.write("Your Location Was Not Detected By Google Loader"); } When this didn't work I tried following the google maps 3.0 detect location seen here: Detecting Location I've done all this after seeing this work correctly in google latitude.. so I know there has to be a way to get the location... any thoughts, ideas on what I could possibly try? Thank you kindly

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• LWJGL not working

  - by Jesse Welch

  I'm working on a homework assignment to modify code given by my professor using LightWeight Java Game Library. The problem is that I can't fully load the test code to begin testing modifications. I've linked against the jar file as it says to in the modifications, but I still have one lingering error. The import statement import org.lwjgl.util.glu.*; Cannot be resolved, so I have errors on the following lines, spread throughout the code: textures[0] = GLApp.makeTexture("green.bmp"); GLU.gluPerspective(45.0f, (float)Display.getDisplayMode().getWidth() / (float)Display.getDisplayMode().getHeight(), 0.1f, 100.0f); GLU.gluLookAt(cameraX, cameraY, cameraZ, lookX, lookY, lookZ, 0.0f, 1.0f, 0.0f);` Any ideas on what is going wrong?

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• how Postfix anti spam configuration works with DNS-based Blackhole List providers

  - by Ashish

  Hello, I have setup a Postfix mail server for incoming mails that is required to never reply to external enviornment i.e it will accept all incoming mails and never reply anything that can be used as a trace to locate and verify it's existence. I have implemented the Postfix anti-UCE configuration by using the following settings in postfix main.cf for countering spam generating mail servers: 'smtpd_recipient_restrictions = reject_rbl_client zen.spamhaus.org, reject_rbl_client bl.spamcop.net' Now i have certain doubts/questions: How Postfix is able to communicate with Black hole list providers i.e How this whole process works?, e.g here they are zen.spamhaus.org, bl.spamcop.net, so that i can test the performance of whole process. Can a header be added in the received mail regarding the status of the results of the above verification process, since i will not reply any traces from my incoming mail receiving Postfix server, so i need this feature? Please post relevant links for reference. Thanks in advance!!! Ashish

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• Fastest way to convert datatable to generic list

  - by Joel Coehoorn

  I have a data tier select method that returns a datatable. It's called from a business tier method that should then return a strongly typed generic List. What I want to do is very similar (but not the same as) this question: http://stackoverflow.com/questions/208532/how-do-you-convert-a-datatable-into-a-generic-list What's different is that I want the list to contain strongly-typed objects rather than datarows (also, I don't have linq avaiable here yet). I'm concerned about performance. The business tier method will in turn be called from the presentation tier, and the results will be iterated for display to the user. It seems very wasteful to add an extra iteration at the business tier, only do it again right away for the presentation, so I want this to be as quick as possible. This is a common task, so I'm really looking for a good pattern that can be repeated over and over.

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• WCF- Large Data

  - by Pinu

  I have a WCF Web Service with basicHTTPBinding , the server side the transfer mode is streamedRequest as the client will be sending us large file in the form of memory stream. But on client side when i use transfer mode as streamedRequest its giving me a this errro "The remote server returned an error: (400) Bad Request" And when i look in to trace information , i see this as the error message Exception: There is a problem with the XML that was received from the network. See inner exception for more details. InnerException: The body of the message cannot be read because it is empty. I am able to send up to 5MB of data using trasfermode as buffered , but it will effect the performance of my web service in the long run , if there are many clients who are trying to access the service in buffered transfer mode. SmartConnect.Service1Client Serv = new SmartConnectClient.SmartConnect.Service1Client(); SmartConnect.OrderCertMailResponse OrderCert = new SmartConnectClient.SmartConnect.OrderCertMailResponse(); OrderCert.UserID = "abcd"; OrderCert.Password = "7a80f6623"; OrderCert.SoftwareKey = "90af1"; string applicationDirectory = @"\\inid\utty\Bran"; byte[] CertMail = File.ReadAllBytes(applicationDirectory + @"\5mb_test.zip"); MemoryStream str = new MemoryStream(CertMail); //OrderCert.Color = true; //OrderCert.Duplex = false; //OrderCert.FirstClass = true; //OrderCert.File = str; //OrderCert.ReturnAddress1 = "Test123"; //OrderCert.ReturnAddress2 = "Test123"; //OrderCert.ReturnAddress3 = "Test123"; //OrderCert.ReturnAddress4 = "Test123"; OrderCert.File = str; //string OrderNumber = ""; //string Password = OrderCert.Password; //int ReturnCode = 0; //string ReturnMessage = ""; //string SoftwareKey = OrderCert.SoftwareKey; //string UserID = OrderCert.UserID; //OrderCert.File = str; MemoryStream FileStr = str; Serv.OrderCertMail(OrderCert); // Serv.OrderCertMail(ref OrderNumber, ref Password, ref ReturnCode, ref ReturnMessage, ref SoftwareKey, ref UserID, ref FileStr ); lblON.Text = OrderCert.OrderNumber; Serv.Close(); // My Web Service - Service Contract [OperationContract] OrderCertMailResponse OrderCertMail(OrderCertMailResponse OrderCertMail); [MessageContract] public class OrderCertMailResponse { string userID = ""; string password = ""; string softwareID = ""; MemoryStream file = null; //MemoryStream str = null; [MessageHeader] //[DataMember] public string UserID { get { return userID; } set { userID = value; } } [MessageHeader] //[DataMember] public string Password { get { return password; } set { password = value; } } [MessageHeader] //[DataMember] public string SoftwareKey { get { return softwareID; } set { softwareID = value; } } [MessageBodyMember] // [DataMember] public MemoryStream File { get { return file; } set { file = value; } } [MessageHeader] //[DataMember] public string ReturnMessage; [MessageHeader] //[DataMember] public int ReturnCode; [MessageHeader] public string OrderNumber; //// Control file fields //[MessageHeader] ////[DataMember] //public string ReturnAddress1; //[MessageHeader] ////[DataMember] //public string ReturnAddress2; //[MessageHeader] ////[DataMember] //public string ReturnAddress3; //[MessageHeader] ////[DataMember] //public string ReturnAddress4; //[MessageHeader] ////[DataMember] //public bool FirstClass; //[MessageHeader] ////[DataMember] //public bool Color; //[MessageHeader] ////[DataMember] //public bool Duplex; } [ServiceBehavior(IncludeExceptionDetailInFaults = true)] public class Service1 : IService1 { public OrderCertMailResponse OrderCertMail(OrderCertMailResponse OrderCertMail) { OrderService CertOrder = new OrderService(); ClientUserInfo Info = new ClientUserInfo(); ControlFileInfo Control = new ControlFileInfo(); //Info.Password = "f2496623"; // hard coded password for development testing purposes //Info.SoftwareKey = "6dbb71"; // hard coded software key this is a developement software key //Info.UserName = "sdfs"; // hard coded UserID - for testing Info.UserName = OrderCertMail.UserID.ToString(); Info.Password = OrderCertMail.Password.ToString(); Info.SoftwareKey = OrderCertMail.SoftwareKey.ToString(); //Control.ReturnAddress1 = OrderCertMail.ReturnAddress1; //Control.ReturnAddress2 = OrderCertMail.ReturnAddress2; //Control.ReturnAddress3 = OrderCertMail.ReturnAddress3; //Control.ReturnAddress4 = OrderCertMail.ReturnAddress4; //Control.CertMailFirstClass = OrderCertMail.FirstClass; //Control.CertMailColor = OrderCertMail.Color; //Control.CertMailDuplex = OrderCertMail.Duplex; //byte[] CertFile = new byte[0]; //byte[] CertFile = null; //string applicationDirectory = @"\\intrepid\utility\Bryan"; // byte[] CertMailFile = File.ReadAllBytes(applicationDirectory + @"\3mb_test.zip"); //MemoryStream str = new MemoryStream(CertMailFile); OrderCertMailResponseClass OrderCertResponse = CertOrder.OrderCertmail(Info,Control,OrderCertMail.File); OrderCertMail.ReturnMessage = OrderCertResponse.ReturnMessage.ToString(); OrderCertMail.ReturnCode = Convert.ToInt32(OrderCertResponse.ReturnCode.ToString()); OrderCertMail.OrderNumber = OrderCertResponse.OrderNumber; return OrderCertMail; }

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• How to enter text in AJAX HTML Editor using watin

  - by Shaki

  Hi, I could not figure out how to enter text into HTML Editor using Watin. I tried //ie.TextField(Find.ById("htmlDetail_ctl06_ctl04")).TypeText("ABCD"); But got error: Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept the focus. Can you give some example how to enter text into AJAX HTML Editor using watin please? I am not sure what to plug in frameSrc and java script from this solution - http://stackoverflow.com/questions/939448/unit-testing-the-ms-ajax-toolkit-html-editor Here is html from Develper tool when click the text box: Thanks in advance

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• SIP and Java, where to start and with what?

  - by Senne

  I want to implement the SIP protocol in java and would want to be able to create different clients (5 or more) and make them connect to a proxy server. This is all for testing purposes so I would like to be able to see well what's happening on a rather low level. The clients should first be able to communicate trough text and later on maybe also by audio. (If I ever get that far) I already read a bit about the JAIN libraries and what I understood from that is that they are not really well suited for the server side? I also didn't really find any proxy server examples, tutorials, using JAIN. I also found this SIP Servlet Tutorial book, I used HTTP servlets in the past but should I prefer servlets or JAIN or ...? I'm quite new to SIP so I don't really know where to start or what to choose in combination with java.

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• Nhibernate equivalent of LinqToEntitiesDomainService in RIA

  - by VexXtreme

  Hi, When using Entity Framework with RIA domain services, domain services are inherited from LinqToEntitiesDomainService, which, I suppose, allows you to make linq queries on a low level (client-side) which propagate into ORM; meaning that all queries are performed on the database and only relevant results are retrieved to the server and thus the client. Example: var query = context.GetCustomersQuery().Where(x => x.Age > 50); Right now we have a domain service which inherits from DomainService, and retrieves data through NHibernate session as in: virtual public IQueryable<Customer> GetCustomers() { return sessionManager.Session.Linq<Customer>(); } The problem with this approach is that it's impossible to make specific queries without retrieving entire tables to the server (or client) and filtering them there. Is there a way to make linq querying work with NHibernate over RIA like it works with EF? If not, we're willing to switch to EF because of this, because performance impact would be just too severe. Thanks

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• Cassandra and asp.net (C#)

  - by Sergey Osypchuk

  I am interested to create portal on cassandra services, since I faced some performance and scale issues starting from 1 million of records. Definitely, it could be solved, but I am interested on other options. My main issues is cost of updating all necessary indexes, to make reading fast. First, is cassandra is good way for asp.net programmers? I mean, maybe there is some other projects, which worth to take a look And second, can you provide any documentation samples on how to start with cassandra programming from C#?

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• Turning off IE8 Compatibility Mode, Good or Bad?

  - by Mike Cornell

  Hopefully this question isn't as subjective as I think it may be. I have an Intranet application which needs to work with IE8 as the enterprise is replacing IE6 as the standard browser. Our testing team found that it did not work in IE8, little did they know that it actually did. Their browsers were set to run IE8 in compatibility mode for Intranet applications. I found that if I set the meta tag for X-UA-Compatible to IE=EmulateIE8 that I could force the browser to render this application as IE8 and the application worked fine. Are there any pitfalls that I don't know about for this solution? If so, is there a better solution?

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• Flex HTTPService security error using Safari

  - by Ryan M

  I'm using the HTTPService object in actionscript to send some data to a php file on another server which then inserts the data to a database. I set up the crossdomain.xml file in the root of the directory that contains the php file to get around any security issues. Everything works fine on Firfox 3.5 (on mac and pc) and on IE 7 & 8. When testing on Safari 4 I get an error which would be expected when a crossdomain.xml doesn't exist. [RPC Fault faultString="Security error accessing url" faultCode="Channel.Security.Error" faultDetail="Destination: DefaultHTTP"] at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler() at mx.rpc::Responder/fault() at mx.rpc::AsyncRequest/fault() at DirectHTTPMessageResponder/securityErrorHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.net::URLLoader/redirectEvent() Any ideas on how to get this to work on Safari? It's seems as if Safari isn't accessing the crossdomain.xml file.

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• Facebook canvas Iframe App authentication problem.

  - by itsoft3g

  hi, I am in the conversion process of facebook app from fbml to iframe. Now i am testing using few iframe pages. $user = $facebook->require_login(); It gives the current user logged in. Once it get the variable from the facebook.com it saves in cookie by the PHP API provided by facebook). I logged out using another tab of facebook and i tryed using my app without refreshing the whole site (by just using the links inside my app). It still gives the $user variable. It indicates that user has logged in instead of user logged out. Please help me out. I want my app secured. It looks my iframe app accessible when we select "open this frame in new window". I need a solution for this too. Thanks in advance.

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• Preview label written in Eltron Programming Language EPL?

  - by Mrgreen

  I have code produced by our proprietry system in the Eltron Programming Language: This is sent to Eltron/Zebra label printers to be printed. Is there some kind of software that would allow me to interpret this code to do some form of 'print preview'? I am considering developing a way to convert this into an image or even postscript pdf, but I am struggling with how to do the barcodes (the lines starting in B is for barcodes). N Q296,24 R132,0 S2 D9 ZB A3,2,0,3,1,1,N,"RB10SS5" B3,22,0,2C,2,4,35,N,"391369840" A3,60,0,3,1,1,N,"391369840" A3,80,0,3,1,1,N,"Testing" A3,100,0,4,1,1,N,"Serology" A3,130,0,1,1,1,N,"SSTORE" A185,16,0,1,1,1,N,"17 Mar" A185,35,0,1,1,1,N,"SEROL" A185,51,0,1,1,1,N,"0.50" B400,208,0,2C,2,4,40,N,"391369840" A400,254,0,2,1,1,N,"391369840" P1

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• Ext GWT (GXT) tooltip over a grid row

  - by Eduardo Palma

  I'm developing a custom tooltip using Ext GWT (GXT) for a project of mine, and this tooltip has to appear over Grid rows when they're selected. I can't use the default GXT tooltip or quicktip because I need be able to add Components (like buttons) to this tooltip. The problem is that the GXT Grid component doesn't expose a event related to mousing over a row (although there's RowClick and RowMouseDown). I tried adding a listener to the Grid with the OnMouseOver and OnMouseOut events anyway, but it doesn't work as expected. It fires these events up whenever you mouse over any of the divs and spans that composes a row. The only way I see to solve this is to subclass the GridView component and make each row become a Component itself, but that would be a lot of work and would probably impact performance as well. I can't help but think there's a better way to do this. Could someone more experienced with GXT give me a light?

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• Why is WPFToolkit DataGrid so slow when binding?

  - by Schneider

  I have a very simple test application where I have two objects, each with a small collection of items. when I select an object I display its collection in a WPFToolkit DataGrid. The problem is there is a noticeable delay, such that if you press up/down keys to toggle selection between objects you can see it can't keep up. Why is the performance so bad? <Window x:Class="SlowGridBinding.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:Controls="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" Title="MainWindow" Height="350" Width="525"> <StackPanel> <ListBox ItemsSource="{Binding Shops}" DisplayMemberPath="Name" IsSynchronizedWithCurrentItem="True"/> <Controls:DataGrid ItemsSource="{Binding Shops/Vegetables}" AutoGenerateColumns="True"/> </StackPanel> The DataContext is populated with some test classes filled with 50 items of random test data.

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• How can I detect touch events on a UIImageView inside a deep hierarchy of UIViews?

  - by jester

  I am developing a simple game on iPhone and I started with a View based application, and through the UIViewController I am loading a custom UIView that contains some more UIViews and some UIImageViews. I want to detect touch events on some of the UIImageViews, but I wasn't able so far. I've created a second project for testing purposes and figured that UIImageViews handle touch events when the hierarchy is like : UIViewController - UIView - UIImageView, but when it's like : UIViewController - UIView - UIView - UIImageView they are not detected. Notes: - userInteractionEnabled is YES in all cases - all UIViews and UIImageViews I mention above are custom subclasses. Can you think of any reason why, when a custom UIImageView gets deeper in the view hierarchy can't receive touch events?

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• SQL Server: Profiling statements inside a User-Defined Function

  - by Craig Walker

  I'm trying to use SQL Server Profiler (2005) to track down some application performance problems. One of the calls being made is to a table-valued user-defined function. This function wraps a select that joins several tables together. In SQL Server Profiler, the call to the UDF is logged. However, the select that underlies the UDF isn't being logged at all. Because of this, I'm not getting useful data on which tables & indexes are being hit. I'd like to feed this info into the Database Tuning Advisor for some indexing advice. Is there any way (short of unwrapping the queries themselves) to log the tables called by UDFs in Profiler?

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