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• Advantages of Client/Server Architecture over Mainframe Architecture

  Originally mainframe architectures relied on a centralized host server that processed data and returned it to be displayed on a dummy terminal. These dummy terminals did not have my processing power and could only display data that was sent from the mainframe. Application architecture completely changed with the advent of N-Tier architecture. The N-Tier architecture replaced the dummy terminals with standard PCs that could think and/or process for themselves. This allowed for applications to be decentralized. Further, this type of architecture also breaks up the roles found within a mainframe by extracting Web Interfaces, Application Logic and Data access in to 3 separate parts so that it can be extended and distributed as the demands of an application increases.

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• How do I get security updates for restricted/partner packages?

  - by laramichaels

  I want to perform just security updates on Ubuntu 12.04 LTS, keeping the rest of the system unchanged. I need to do this from the command line, no the GUI update manager. I have implemented the solution described here, which seems to work great for this purpose. I merely substituted 'precise' for 'lucid' given that I am on 12.04. My question is: by using apt pinning as described in that answer, will I still receive security updates for packages distributed through the "other" repositories - partner, restricted, multiverse, etc? Or will it only get me updates for the packages in the "core" distribution? thanks! ~l

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• Oracle Linux 6.3 has been released

  - by Lenz Grimmer

  We're happy to announce the availability of Oracle Linux 6.3, the third update release for Oracle Linux 6. ISO images can now be obtained from the Oracle Software Delivery Cloud, the individual RPM packages have already been published from our public yum repository. This distribution now includes the Unbreakable Enterprise Kernel Release 2 (2.6.39-200), Oracle's recommended kernel version for Oracle Linux. For further details, please see the Oracle Linux 6.3 Release Notes. Remember, Oracle Linux can be downloaded, used and distributed free of charge, updates and errata are freely available. For support, you are free to decide for which of your systems you want to obtain a support subscription, and at which level each of  them should be supported. This makes Oracle Linux an ideal choice for both your development and production systems - you decide which support coverage is the best for each of your systems individually, while keeping all of them up-to-date and secure. Wim Coekaerts recently wrote several blog posts about the benefits of Oracle Linux, which are worth a read: Oracle Linux components More Oracle Linux options My own personal use of Oracle Linux

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• How To Get Google+ Invites?

  - by Gopinath

  Google Plus is a new social networking service from Google and it’s aimed to compete with the social networking giant Facebook. Google’s attempts at social networking in the past were never a hit (few of them were miserable fails – Google Wave, Google Buzz) but this time Google seems to be getting things. Google Plus is an invite only service at the moment and you can’t access it without an initiation. So far Google sent invitations to selected bloggers and high profile web users. If you want an invite to Google Plus visit official Google Plus invitation request page and register your email id. There is no word from Google on when the invites will be distributed to public users. Hopefully Google should roll out invitations soon. This article titled,How To Get Google+ Invites?, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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• Azure Blob storage defrag

  - by kaleidoscope

  The Blob Storage is really handy for storing temporary data structures during a scaled-out distributed processing. Yet, the lifespan of those data structures should not exceed the one of the underlying operation, otherwise clutter and dead data could potentially start filling up your Blob Storage Temporary data in cloud computing is very similar to memory collection in object oriented languages, when it's not done automatically by the framework, temp data tends to leak. In particular, in cloud computing,  it's pretty easy to end up with storage leaks due to: Collection omission. App crash. Service interruption. All those events cause garbage to accumulate into your Blob Storage. Then, it must be noted that for most cloud apps, I/O costs are usually predominant compared to pure storage costs. Enumerating through your whole Blob Storage to clean the garbage is likely to be an expensive solution. Lokesh, M

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• Pre-Populate the AppFabric Cache

  When I start talking to people about the caching functionality that is part of Windows Server AppFabric I am usually asked "What is the AppFabric Cache?"  The MSDN page at http://msdn.microsoft.com/en-us/library/ee790954.aspx provides a great overview (below) as well as additional information.  The Cache is defined as: "Windows Server AppFabric caching features use a cluster of servers that communicate with each other to form a single, unified application cache system. As a distributed...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Apple Developer Enterprise Program?

  - by Gnial0id

  I'm building an iOS application for a client (not an enterprise but non-profit association with under than 500 employess), distributed in a free version and a "paid" one. The free version will be available with iTunes/AppStore, no problem with that. But about the paid one... the distribution my client wants is different. They want to distribute it to their clients as a bonus in their subscription, and so, to control this distribution. The first answer would be "iOS Developer Enterprise Program", but it's not an enterprise and have less than 500 employees. Will the fact that my client will distribute the app' with a subscription be a problem ? I spend a lot of time to read documentation, but it is not very clear. I'm a bit lost, I admit it. Any help would grateful.

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• No OpenCL devices (13.10 Core I5 4430 Intel Graphics HD)

  - by Itai Bar-Haim

  I've been looking quite a lot for this but couldn't find anything that worked. I have an Intel Core I5-4430 based system with no extra graphics adapter (so it's using the on-board, integrated Intel Graphics HD that is part of the CPU), running Ubuntu 13.10. When running BOINC World Community Grid it says "No usable GPUs". When running a bitcoin mining program it says "No OpenCL devices". I searched the web, found two possible solutions - one was to use the Intel OpenCL driver for Xeon platforms, the other was to use the AMD driver. Tried both. I failed installing the Intel driver as there were too many prerequisites that I just didn't manage to install, and the AMD installation was quite fast to its size (it's 200MB, and took far less than a minute to install), but it didn't solve the problem. Perhaps I'm looking in the wrong direction here, I'm not sure, but is there anyway I can utilize the advance features of my CPU for those distributed computation programs?

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• What label of tests are BizUnit tests?

  - by charlie.mott

  BizUnit is defined as a "Framework for Automated Testing of Distributed Systems.  However, I've never seen a catchy label to describe what sort of tests we create using this framework. They are not really “Unit Tests” that's for sure. "Integration Tests" might be a good definition, but I want a label that clearly separates it from the manual "System Integration Testing" phase of a project where real instances of the integrated systems are used. Among some colleagues, we brainstormed some suggestions: Automated Integration Tests Stubbed Integration Tests Sandbox Integration Tests Localised Integration Tests All give a good view of the sorts of tests that are being done. I think "Stubbed Integration Tests" is most catchy and descriptive. So I will use that until someone comes up with a better idea.

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• running jar in a terminal using axis2

  - by Emilio

  I'm trying to run in the command line a java application distributed in a jar file. It call an axis2 web service, so the jar contains a /axis2client directory with rampart.mar security module. It works fine while I run it in netbeans, but it throws an exception if I try to run it in a terminal using this command: java -jar myfile.jar The Exception: org.apache.axis2.AxisFault: invalid url: //file:/home/xxx/Desktop/myfile.jar!/axis2client/ (java.net.MalformedURLException: no protocol: //file:/home/xxx/Desktop/myfile.jar) As you can see, it's trying to use the /axis2client directory inside the jar, as when I run it in Netbeans, but It fails with a MalformedURLException. I think it's something about the protocol 'file:', probably '//file:/' must be 'file:///'. The problem is that I cannot change this call to the directory because the method that loads the /axis2client directory it's not mine, it's from another library that use my project and include all the axis2 support. So, any idea?? Thanks in advance lads!

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• Proper way to measure the scalability of web Application

  - by Jorge

  Let's say that I have a web Application where i'm going to have 300 users and each one have to see data on real time, imagine that each client make an ajax call to the server to see in real time what's happens with the changes of the data, this calls are made each 300 ms per user. I know that i can run a simulation to see if the hardware of my server supports this example. But what happen's if the number of users start to grow up. Is there a way that i can measure the hardware needed to handle this growing behavior, a software, a formula, algorithm or maybe recommend me if i need to implement an distributed application with multiplies servers and balance the loads.

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• General Purpose ASP.NET Data Source Control

  - by Ricardo Peres

  OK, you already know about the ObjectDataSource control, so what’s wrong with it? Well, for once, it doesn’t pass any context to the SelectMethod, you only get the parameters supplied on the SelectParameters plus the desired ordering, starting page and maximum number of rows to display. Also, you must have two separate methods, one for actually retrieving the data, and the other for getting the total number of records (SelectCountMethod). Finally, you don’t get a chance to alter the supplied data before you bind it to the target control. I wanted something simple to use, and more similar to ASP.NET 4.5, where you can have the select method on the page itself, so I came up with CustomDataSource. Here’s how to use it (I chose a GridView, but it works equally well with any regular data-bound control): 1: <web:CustomDataSourceControl runat="server" ID="datasource" PageSize="10" OnData="OnData" /> 2: <asp:GridView runat="server" ID="grid" DataSourceID="datasource" DataKeyNames="Id" PageSize="10" AllowPaging="true" AllowSorting="true" /> The OnData event handler receives a DataEventArgs instance, which contains some properties that describe the desired paging location and size, and it’s where you return the data plus the total record count. Here’s a quick example: 1: protected void OnData(object sender, DataEventArgs e) 2: { 3: //just return some data 4: var data = Enumerable.Range(e.StartRowIndex, e.PageSize).Select(x => new { Id = x, Value = x.ToString(), IsPair = ((x % 2) == 0) }); 5: e.Data = data; 6: //the total number of records 7: e.TotalRowCount = 100; 8: } Here’s the code for the DataEventArgs: 1: [Serializable] 2: public class DataEventArgs : EventArgs 3: { 4: public DataEventArgs(Int32 pageSize, Int32 startRowIndex, String sortExpression, IOrderedDictionary parameters) 5: { 6: this.PageSize = pageSize; 7: this.StartRowIndex = startRowIndex; 8: this.SortExpression = sortExpression; 9: this.Parameters = parameters; 10: } 11:  12: public IEnumerable Data 13: { 14: get; 15: set; 16: } 17:  18: public IOrderedDictionary Parameters 19: { 20: get; 21: private set; 22: } 23:  24: public String SortExpression 25: { 26: get; 27: private set; 28: } 29:  30: public Int32 StartRowIndex 31: { 32: get; 33: private set; 34: } 35:  36: public Int32 PageSize 37: { 38: get; 39: private set; 40: } 41:  42: public Int32 TotalRowCount 43: { 44: get; 45: set; 46: } 47: } As you can guess, the StartRowIndex and PageSize receive the starting row and the desired page size, where the page size comes from the PageSize property on the markup. There’s also a SortExpression, which gets passed the sorted-by column and direction (if descending) and a dictionary containing all the values coming from the SelectParameters collection, if any. All of these are read only, and it is your responsibility to fill in the Data and TotalRowCount. The code for the CustomDataSource is very simple: 1: [NonVisualControl] 2: public class CustomDataSourceControl : DataSourceControl 3: { 4: public CustomDataSourceControl() 5: { 6: this.SelectParameters = new ParameterCollection(); 7: } 8:  9: protected override DataSourceView GetView(String viewName) 10: { 11: return (new CustomDataSourceView(this, viewName)); 12: } 13:  14: internal void GetData(DataEventArgs args) 15: { 16: this.OnData(args); 17: } 18:  19: protected virtual void OnData(DataEventArgs args) 20: { 21: EventHandler<DataEventArgs> data = this.Data; 22:  23: if (data != null) 24: { 25: data(this, args); 26: } 27: } 28:  29: [Browsable(false)] 30: [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] 31: [PersistenceMode(PersistenceMode.InnerProperty)] 32: public ParameterCollection SelectParameters 33: { 34: get; 35: private set; 36: } 37:  38: public event EventHandler<DataEventArgs> Data; 39:  40: public Int32 PageSize 41: { 42: get; 43: set; 44: } 45: } Also, the code for the accompanying internal – as there is no need to use it from outside of its declaring assembly - data source view: 1: sealed class CustomDataSourceView : DataSourceView 2: { 3: private readonly CustomDataSourceControl dataSourceControl = null; 4:  5: public CustomDataSourceView(CustomDataSourceControl dataSourceControl, String viewName) : base(dataSourceControl, viewName) 6: { 7: this.dataSourceControl = dataSourceControl; 8: } 9:  10: public override Boolean CanPage 11: { 12: get 13: { 14: return (true); 15: } 16: } 17:  18: public override Boolean CanRetrieveTotalRowCount 19: { 20: get 21: { 22: return (true); 23: } 24: } 25:  26: public override Boolean CanSort 27: { 28: get 29: { 30: return (true); 31: } 32: } 33:  34: protected override IEnumerable ExecuteSelect(DataSourceSelectArguments arguments) 35: { 36: IOrderedDictionary parameters = this.dataSourceControl.SelectParameters.GetValues(HttpContext.Current, this.dataSourceControl); 37: DataEventArgs args = new DataEventArgs(this.dataSourceControl.PageSize, arguments.StartRowIndex, arguments.SortExpression, parameters); 38:  39: this.dataSourceControl.GetData(args); 40:  41: arguments.TotalRowCount = args.TotalRowCount; 42: arguments.MaximumRows = this.dataSourceControl.PageSize; 43: arguments.AddSupportedCapabilities(DataSourceCapabilities.Page | DataSourceCapabilities.Sort | DataSourceCapabilities.RetrieveTotalRowCount); 44: arguments.RetrieveTotalRowCount = true; 45:  46: if (!(args.Data is ICollection)) 47: { 48: return (args.Data.OfType<Object>().ToList()); 49: } 50: else 51: { 52: return (args.Data); 53: } 54: } 55: } As always, looking forward to hearing from you!

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• Software license restricting commercial usage like CC BY-NC-SA

  - by Nick

  I want to distribute my software under license like Creative Commons Attribution - Non commercial - Share Alike license, i.e. Redistribution of source code and binaries is freely. Modified version of program have to be distributed under the same license. Attribution to original project should be supplied to. Restrict any kind of commercial usage. However CC does not recommend to use their licenses for software. Is there this kind of software license I could apply? Better if public license, but as far as I know US laws says that only EULA could restrict usage of received copy?

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• svn vs git for the sole developer? [closed]

  - by nattyP

  If I am sole developer (I do not work in a team) working from my laptop (Windows OS and Linux VM) and backing up data to the cloud (Dropbox etc), then is git still better than svn for my version control needs? I was thinking not since I wont need any of git's distributed features. But is git such a better approach to version control that I should consider moving anyway? With so many articles saying how people are moving from svn to git? I was wondering, if they are talking about large or open projects with teams of developers vs the sole developer. What do you think?

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• Software development magazines [closed]

  - by Sebastian

  Ive spent the last hour or so browsing the web for professional development magazines. I am mostly interested in the java platform, agile methods, "programming in general" (tutorials on languages or whatever, "hot new stuff" etc) and software craftmanship. My best finding yet was pragpub and maybe MSDN magazine. I am willing to pay and have a Zinio account if anyone knows a magazine about programming that is distributed by them. Ive already browsed a couple of related threads here on stackexchange. ACM and IEEE does not seem relevant, as Im not interested in research articles. Maybe conferences like OOPSLA as somebody mentioned in another thread. PS. I prefer if they are in pdf or readable on kindle or a tablet. DS. BR Sebastian

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• My Last "Catch-Up" Post for 2010 Content

  - by KKline

  I did a lot of writing in 2010. Unfortunately, I didn't do a good job of keeping all of that writing equally distributed throughout all of the channels where I'm active. So here are a few more posts from my blog, put on-line during the months of November and December 2010, that I didn't get posted here on SQLBlog.com: 1. It's Time to Upgrade! So many of my customers and many of you, dear readers, are still on SQL Server 2005. Join Kevin Kline , SQL Server MVP and SQL Server Technology Strategist...(read more)

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• To branch or not to branch?

  - by Idsa

  Till recently my development workflow was the following: Get the feature from product owner Make a branch (if feature is more than 1 day) Implement it in a branch Merge changes from main branch to my branch (to reduce conflicts during backward merging) Merge my branch back to main branch Sometimes there were problems with merging, but in general I liked it. But recently I see more and more followers of idea to not make branches as it makes more difficult to practice continuous integration, continuous delivery, etc. And it sounds especially funny from people with distributed VCS background who were talking so much about great merging implementations of Git, Mercurial, etc. So the question is should we use branches nowadays?

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• My Rhythmbox plugin can't meet the Ubuntu Software Center "my-app" requirements

  - by allquixotic

  At http://developer.ubuntu.com/publish/my-apps-packages/ the following technical requirements are cited: Technical requirements In order for your application to be distributed in the Software Centre it must: Be in one, self-contained directory when installed Be able to be installed into the /opt/ directory (*) Be executable by all users from the /opt/ directory (**) Write all configuration settings to ~/.config/ (This can be one file or a directory containing multiple configuration files) A Rhythmbox plugin cannot satisfy any of these requirements. Rhythmbox has compiled-in locations where it looks for installed plugins. So, is there no way for me to publish my app in Ubuntu Software Center? Would it have to go into Universe repository (which would require tremendously more work and political maneuvering to get it accepted)? I already have all the Debian package infrastructure built for it, so I have made a PPA for it.

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• Advertising Opportunity – Profit Magazine For Oracle OpenWorld

  - by tfryer

  With Oracle OpenWorld fast approaching, Profit Magazine is offering Oracle Specialized partners the opportunity to extend their brand to executive-level Oracle customers and top prospects in the Profit Magazine: Specialized Partner Edition. The printed magazine will be distributed to Oracle attendees at Oracle OpenWorld San Francisco, and the digital copy will be distribution to over 500,000 customers in the Profit readers circle. In addition, the magazine will be promoted via social media such as Facebook, LinkedIn, and Twitter. For a very affordable advertising opportunity, please contact Tom Cometa at [email protected] or +1.510.339.2403. Reserve before July 27th. Hurry! An early bird discount of 15% applies if booked before July 18th.

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• What is the politically correct way of refactoring other's code?

  - by dukeofgaming

  I'm currently working in a geographically distributed team in a big company. Everybody is just focused on today's tasks and getting things done, however this means sometimes things have to be done the quick way, and that causes problems... you know, same old, same old. I'm bumping into code with several smells such as: big functions pointless utility functions/methods (essentially just to save writing a word), overcomplicated algorithms, extremely big files that should be broken down into different files/classes (1,500+ lines), etc. What would be the best way of improving code without making other developers feel bad/wrong about any proposed improvements?

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• Cloud Integration White Paper - Now Available

  - by Bruce Tierney

  Interested in expanding your existing application infrastructure to integrate with cloud applications?  Download the new Oracle White Paper "Cloud Integration - A Comprehensive Solution" to learn not just about connectivity but the other key aspects of successful cloud integration. The paper includes three technical examples of cloud integration with Oracle Fusion Applications, Saleforce, and Workday and follows with the importance of taking a comprehensive approach to also include service aggregation, service virtualization, cloud security considerations and the benefit of maintaining a unified approach to monitoring and management despite an increasingly distributed hybrid infrastructure. To keep the integration architecture from being defined "accidentally" as new business units subscribe to additional cloud vendors outside the participation of IT, a discussion on the "Accidental SOA Cloud Architecture" is included: As shown in the table of contents below, the white paper provides a combination of high-level awareness about key considerations as well as a technical deep dive of the steps needed for cloud integration connectivity: Hope you find the White Paper valuable.  Please download from the following link

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• Where can I find "magic numbers" for classic game play mechanics?

  - by MrDatabase

  I'd like to find some "magic numbers" for the classic helicopter game. For example the numbers that determine how fast the helicopter accelerates up and down. Also perhaps the "randomness" of the obstacles (uniformly distributed? Gaussian?). Where can I find these numbers? p.s. I don't care about the particular platform... Flash on the desktop browser is just as good as some implementation on a mobile device.

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• Secure Enterprise Search 11.2.2.2 Now Available for PeopleTools 8.53

  - by Matthew Haavisto

  We are pleased to announce that Oracle Secure Enterprise Search (SES) 11.2.2.2 is now available to PeopleSoft Customers on PeopleTools 8.53.  The minimum PeopleTools Patch Version Required to adopt SES 11.2.2.2 is PeopleTools 8.53.06.  This version of SES provides some important benefits for PeopleSoft Customers, particularly in the areas of platform support, distributed architecture support, and RAC support.  You can get all the details on this update on My Oracle Support.  This MOS document lists the fixes and configurations needed for PeopleTools certification of SES 11.2.2.2. For other useful information on PeopleTools and SES, see this Oracle forum.

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• Using EPEL repos with Oracle Linux

  - by wcoekaer

  There's a Fedora project called EPEL which hosts a set of additional packages that can be installed on top of various distributions such as Red Hat Enterprise Linux, CentOS, Scientific Linux and of course also Oracle Linux. These packages are not distributed by the distribution vendor and as such also not supported by the vendors (including Oracle) however for users that want to pick up some extras that are useful, it's very easy to do this. All you need to do is download the EPEL RPM from the website, install it on Oracle Linux 5 or Oracle Linux 6 and run yum install or yum search to get the packages. example : # wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm # rpm -ivh epel-release-6-5.noarch.rpm # yum repolist Loaded plugins: refresh-packagekit, rhnplugin repo id repo name status epel Extra Packages for Enterprise Linux 6 - x86_64 7,124 The folks that build these repositories are doing a great job at adding very useful packages. They are free, but also unsupported of course.

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• Java Developers: Is Ant still in the "main stream" for builds? Do we push new developers to learn it?

  - by Sam Goldberg

  We have been slowly replacing batch command files (windows .bat) which were simply jarring up the classes compiled in the developers IDE, with more comprehensive Ant builds (i.e. get from CVS, clean compile, jar, archive, email, etc.) I've spent a lot of time learning (and debugging issues) with Ant, so I'm most comfortable using it for these tasks. But I wonder if Ant is still in as wide usage as it was when I first started learning, or whether "the world has moved on" to something newer (and maybe slicker). (I've started to see more Maven build stuff distributed, which I've never used, for example.) The practical import of this question, is whether I push new developers to learn Ant, or whether they should be learning something else for builds? I'm never too on top of the trends, so it would be great to hear from other Java developers what they think is the best build tool, and what they think new developers should be learning.

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