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• Juju bootstrap fails to start network on local environment

  - by Amith KK

  I've followed the instructions at https://juju.ubuntu.com/CharmSchool and rebooted 5 times...... I cant seem to do a juju-bootstrap (local) This is the output: amith@amith-desktop:~$ juju bootstrap 2011-11-24 17:08:05,708 INFO Bootstrapping environment 'local' (type: local)... 2011-11-24 17:08:05,710 INFO Checking for required packages... 2011-11-24 17:08:06,593 INFO Starting networking... error: Failed to start network default error: internal error Child process (dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override) status unexpected: exit status 2 Command '['virsh', 'net-start', 'default']' returned non-zero exit status 1 2011-11-24 17:08:07,217 ERROR Command '['virsh', 'net-start', 'default']' returned non-zero exit status 1 Is there any fix at all?

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• Mapping Object Relationships - QuickStart with NHibernate (Part 3)

  - by BobPalmer

  For this third tutorial, we'll be introducing users new to NHibernat to basic object relationships, starting with a simple many-to-one relationship.  I decided that it would make sense to at least get the readers through some basic relationship mapping (including varieties of parent/child and many to many relationships) before diverging into UI, since most folks are looking for enough to bootstrap themsevles into using NHibernate, and this almost always means some kind of relation between their objects. You can find a link to the article at: http://docs.google.com/Doc?docid=0AUP-rKyyUMKhZGczejdxeHZfMjJmM3c3M3Bnbg&hl=en As always, comments, corrections, and suggestions are appreciated! -Bob

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• How Security Products Are Made; An Interview with BitDefender

  - by Jason Fitzpatrick

  Most of us use anti-virus and malware scanners, without giving the processes behind their construction and deployment much of a thought. Get an inside look at security product development with this BitDefender interview. Over at 7Tutorials they took a trip to the home offices of BitDefender for an interview with Catalin Co?oi–seen here–BitDefender’s Chief Security Researcher. While it’s notably BitDefender-centric, it’s also an interesting look at the methodology employed by a company specializing in virus/malware protection. Here’s an excerpt from the discussion about data gathering techniques: Honeypots are systems we distributed across our network, that act as victims. Their role is to look like vulnerable targets, which have valuable data on them. We monitor these honeypots continuously and collect all kinds of malware and information about black hat activities. Another thing we do, is broadcast fake e-mail addresses that are automatically collected by spammers from the Internet. Then, they use these addresses to distribute spam, malware or phishing e-mails. We collect all the messages we receive on these addresses, analyze them and extract the required data to update our products and keep our users secure and spam free. Hit up the link below for the full interview. How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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• How to find siblings of a tree?

  - by smallB

  On my interview for an internship, I was asked following question: On a whiteboard write the simplest algorithm with use of recursion which would take a root of a so called binary tree (so called because it is not strictly speaking binary tree) and make every child in this tree connected with its sibling. So if I have: 1 / \ 2 3 / \ \ 4 5 6 / \ 7 8 then the sibling to 2 would be 3, to four five, to five six and to seven eight. I didn't do this, although I was heading in the right direction. Later (next day) at home I did it, but with the use of a debugger. It took me better part of two hours and 50 lines of code. I personally think that this was very difficult question, almost impossible to do correctly on a whiteboard. How would you solve it on a whiteboard? How to apprehend this question without using a debugger?

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• WPF Alphabet (Available for download)

  - by mbcrump

  WPF Alphabet is a application that I created to help my child learn the alphabet. It displays each letter and pronounces it using speech synthesis. It was developed using WPF and c# in about 3 hours (so its kinda rough). I went ahead and uploaded it to codeplex for those in similar situation or just wanting to see a particular WPF feature. I would also recommend Scott Hanselman’s BabySmash!. Specific WPF Features: DispatcherTimer (WPF) SpeechSynthesizer (WPF) URL Navigate (WPF) not PAGE XAML Examples: DockPanel Border TextBlock HyperLink Button's and Events Download full source and binaries here.

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• Caption Competition 9: Carry on Captioning

  - by Simple-Talk Editorial Team

  This picture below – the one with the rabbits, yes – is clearly something to do with databases. But what? Tell us in the comments – the best / funniest entry wins a $50 Amazon gift card.  Some suggestions to help turn on the comedy tap: The world’s first self-replicating cryptocurrency was hit by hyperinflation almost immediately. Early punchcard computers were ineffective but adorable. Elmer Fud teams up with Wile E Coyote to create the ultimate drop database. You can beat that. A child could beat that. Prove it in the comments below.

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• ViewController in programming

  - by Vishwas Gagrani

  ViewController is a term for classes that handle views in a framework. This is especially used in MVC frameworks. I go through various projects, written by various programmers, who implement MVC in different ways. Especially, i get confused, about the relation between the MainView ( parent view ) and some CustomView ( widget etc) in the framework. I personally pass reference of the MainView into the ViewController to be instantiated. All the subviews of ViewController are added to that reference of MainView. Additionally, ViewController itself is added as a child of MainView. Like this : Want to know, if this is the right way to relate each other ?

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• Houston We have a Problem with Silverlight Client OM&hellip;

  - by MOSSLover

  So I was playing around with NavigationNodeCollection, which is basically like SPNavigationNodeCollection just to make sure it worked without a hitch…Here is a little sample snippet of what should work: Unfortunately, you get a nice little javascript error that does not allow you to access the child nodes.  I tried a foreach() loop that gets a NavigationNode for each parent then loops through the NavigationNode.Children that did not work either.  I threw in two ExecuteQueryAsync statements thinking that would help, unfortunately adding a second statement provides no different results.  This appears to be a bug in the Silverlight Client Object Model.  I reported the error.  Hopefully, we get a fix by RTM so that we can use the easier method to get items into Silverlight, otherwise it’s back to WCF and cross domain policies.  We all love cross domain policies right? Technorati Tags: Client Object Model,SharePoint 2010,Silverlight

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• Disaster Recovery Example

  Previously, I use to work for a small internet company that sells dental plans online. Our primary focus concerning disaster prevention and recovery is on our corporate website and private intranet site. We had a multiphase disaster recovery plan that includes data redundancy, load balancing, and off-site monitoring. Data redundancy is a key aspect of our disaster recovery plan. The first phase of this is to replicate our data to multiple database servers and schedule daily backups of the databases that are stored off site. The next phase is the file replication of data amongst our web servers that are also backed up daily by our collocation. In addition to the files located on the server, files are also stored locally on development machines, and again backed up using version control software. Load balancing is another key aspect of our disaster recovery plan. Load balancing offers many benefits for our system, better performance, load distribution and increased availability. With our servers behind a load balancer our system has the ability to accept multiple requests simultaneously because the load is split between multiple servers. Plus if one server is slow or experiencing a failure the traffic is diverted amongst the other servers connected to the load balancer allowing the server to get back online. The final key to our disaster recovery plan is off-site monitoring that notifies all IT staff of any outages or errors on the main website encountered by the monitor. Messages are sent by email, voicemail, and SMS. According to Disasterrecovery.org, disaster recovery planning is the way companies successfully manage crises with minimal cost and effort and maximum speed compared to others that are forced to make decision out of desperation when disasters occur. In addition Sun Guard stated in 2009 that the first step in disaster recovery planning is to analyze company risks and factor in fixed costs for things like hardware, software, staffing and utilities, as well as indirect costs, such as floor space, power protection, physical and information security, and management. Also availability requirements need to be determined per application and system as well as the strategies for recovery.

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• All in a Day's Work: Unblocking Multiple Downloaded Files with a Single Command

  - by Sam Abraham

  Files downloaded using Internet Explorer retain Internet Zone permission level and hence are “Blocked” by default on Windows 7 machines. Honestly, while an added overhead for developers; I really appreciate this feature as it provides a good protection layer for casual web users. My workaround is to simply unblock the downloaded zip file (if download was a zip file) which, in turn, unblocks the files stored within. Today however, I was left with a situation where I had to “Open” and “Copy” the content rather than “Save” a zip file. That of course left me with a few dozen files I have to manually unblock. A few minutes of internet search lead me to the link below which worked like a charm: 1-Download streams.exe from SystInternals - http://technet.microsoft.com/en-us/sysinternals/bb897440.aspx 2-Go to command prompt (cmd.exe) 3-Navigate to where you have streams.exe installed 4-Use command line switches: streams.exe –s –d “<folder path>” This removed the Internet Zone restrictions from all files under “<folder path>” and its subfolders as well. [Deleted :Zone.Identifier:$DATA] References: http://social.technet.microsoft.com/Forums/en-US/itproxpsp/thread/806f0104-1caa-4a66-b504-7a681d1ccb33/

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• How to reverse file ownership and permission settings

  - by pandisvezia

  I installed LAMP and WordPress on my system a week ago. Since I couldn't create Child Themes in WordPress and work with PHP folders for my other projects collocated in var/www without using Nautilus I wanted to solve the permissions issue. I hoped to bring a solution carrying out the commands on this page for my WordPress folder: http://wiki.apache.org/httpd/FileSystemPermissions. This allowed me to play with any file in the folder like creating and modifying .css files through WP Admin, etc. But after a restart I discovered that I can't change DNS settings of my network connections in the list anymore because it is asking me the root password and even though I enter the password it doesn't let me do the action giving "insufficient privileges" error. Can you help me correct the mistake I possibily made during the configuration and, maybe, configure again the permission and ownership settings for var/www/somefolder as it is adviced to be configured under general circumstances? Thanks in advance!

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• What are the disadvantages of naming things alphabetically?

  - by JoJo

  Let me give you an example of how I name my classes alphabetically: Car CarHonda (subclass of Car) CarHondaAccord (subclass of CarHonda) There are two reasons why I put the type of the class earlier in its name: When browsing your files alphabetically in a file explorer, related items appear grouped together and parent classes appear above child classes. I can progressively refine auto-complete in my IDE. First I type the major type, then the secondary type, and so on without having to memorize what exactly I named the last part of the thing. My question is why do I hardly see any other programmers do this? They usually name things in reverse or some random order. Take the iOS SDK for example: UIViewController UITableViewController What are the disadvantages of my naming convention and the advantages of their convention?

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• Mousin' down the PathListBox

  - by T

  While modifying the standard media player with a new look and feel for Ineta Live I saw a unique opportunity to use their logo with a dotted I with and attached arc as the scrub control. So I created a PathListBox that I wanted an object to follow when a user did a click and drag action.  Below is how I solved the problem.  Please let me know if you have improvements or know of a completely different way.  I am always eager to learn. First, I created a path using the pen tool in Expression Blend (see the yellow line in image below).  Then I right clicked that path and chose [Path] --> [Make Layout Path].   That created a new PathListBox.  Then I chose the object I want to move down the new PathListBox and Placed it as a child in the Objects and Timeline window (see image below).  If the child object (the thing the user will click and drag) is XAML, it will move much smoother than images. Just as another side note, I wanted there to be no highlight when the user selects the “ball” to drag and drop.  This is done by editing the ItemContainerStyle under Additional Templates on the PathListBox.  Post a question if you need help on this and I will expand my explanation. Here is a pic of the object and the path I wanted it to follow.  I gave the path a yellow solid brush here so you could see it but when I lay this over another object, I will make the path transparent.   To animate this object down the path, the trick is to animate the Start number for the LayoutPath.  Not the StartItemIndex, the Start above Span. In order to enable animation when a user clicks and drags, I put in the following code snippets in the code behind. the DependencyProperties are not necessary for the Drag control.   namespace InetaPlayer { public partial class PositionControl : UserControl { private bool _mouseDown; private double _maxPlayTime; public PositionControl() { // Required to initialize variables InitializeComponent(); //mouse events for scrub control positionThumb.MouseLeftButtonDown += new MouseButtonEventHandler(ValueThumb_MouseLeftButtonDown); positionThumb.MouseLeftButtonUp += new MouseButtonEventHandler(ValueThumb_MouseLeftButtonUp); positionThumb.MouseMove += new MouseEventHandler(ValueThumb_MouseMove); positionThumb.LostMouseCapture += new MouseEventHandler(ValueThumb_LostMouseCapture); } // exposed for binding to real slider using a DependencyProperty enables animation, styling, binding, etc.... public double MaxPlayTime { get { return (double)GetValue(MaxPlayTimeProperty); } set { SetValue(MaxPlayTimeProperty, value); } } public static readonly DependencyProperty MaxPlayTimeProperty = DependencyProperty.Register("MaxPlayTime", typeof(double), typeof(PositionControl), null);   // exposed for binding to real slider using a DependencyProperty enables animation, styling, binding, etc....   public double CurrSliderValue { get { return (double)GetValue(CurrSliderValueProperty); } set { SetValue(CurrSliderValueProperty, value); } }   public static readonly DependencyProperty CurrSliderValueProperty = DependencyProperty.Register("CurrSliderValue", typeof(double), typeof(PositionControl), new PropertyMetadata(0.0, OnCurrSliderValuePropertyChanged));   private static void OnCurrSliderValuePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { PositionControl control = d as PositionControl; control.OnCurrSliderValueChanged((double)e.OldValue, (double)e.NewValue); }   private void OnCurrSliderValueChanged(double oldValue, double newValue) { _maxPlayTime = (double) GetValue(MaxPlayTimeProperty); if (!_mouseDown) if (_maxPlayTime!=0) sliderPathListBox.LayoutPaths[0].Start = newValue / _maxPlayTime; else sliderPathListBox.LayoutPaths[0].Start = 0; }   //mouse control   void ValueThumb_MouseMove(object sender, MouseEventArgs e) { if (!_mouseDown) return; //get the offset of how far the drag has been //direction is handled automatically (offset will be negative for left move and positive for right move) Point mouseOff = e.GetPosition(positionThumb); //Divide the offset by 1000 for a smooth transition sliderPathListBox.LayoutPaths[0].Start +=mouseOff.X/1000; _maxPlayTime = (double)GetValue(MaxPlayTimeProperty); SetValue(CurrSliderValueProperty ,sliderPathListBox.LayoutPaths[0].Start*_maxPlayTime); }   void ValueThumb_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { _mouseDown = false; } void ValueThumb_LostMouseCapture(object sender, MouseEventArgs e) { _mouseDown = false; } void ValueThumb_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { _mouseDown = true; ((UIElement)positionThumb).CaptureMouse(); }   } }   I made this into a user control and exposed a couple of DependencyProperties in order to bind it to a standard Slider in the overall project.  This control is embedded into the standard Expression media player template and is used to replace the standard scrub bar.  When the player goes live, I will put a link here.

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• Working with Primary Keys and Generators - Quickstart with NHibernate (Part 4)

  - by BobPalmer

  In this NHibernate tutorial, I'll be digging into the ID tag and Generator classes.  I had originally planned on finishing up a series on relationships (parent/child, etc.) but felt this would be an interesting topic for folks, and I also wanted to start integrating some of the current NHibernate reference. Since this article also includes some reference sections (and since I have not had a chance to check for every possible parameter value), I used the current reference as a baseline, and would welcome any feedback or technical updates that I can incorporate. You can find the entire article up on Google Docs at this link: http://docs.google.com/Doc?id=dg3z7qxv_24f3ch2rf7 As always, feedback, suggestions, and technical corrections are greatly appreciated! Enjoy! - Bob

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• What resources do I need to start developing games? [on hold]

  - by Matt

  I'm in a unique situation here. I'm only just now a sophomore in high school and I've had a passion for gaming and technology since I was a child. I picked up python at age 9 and have learned 3 other languages since then. I never was good at art or such things, but I can imagine amazing logic devices to carry out game elements I would like to try. I've been researching and finding very vague advice on what needs to be present in order for me to develop. I've attempted at many things, but they never become more than a text-based mess. What education in specific would I need to advance in the game industry? Workflows are never clear to me. I've watched videos on Valve, Zenimax, and many others on how to get from an idea to a product. I've never gotten a finished product, but I've always had the idea clearly in my head.

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• What's the term describing this system for generating user interfaces?

  - by mjfgates

  So, there's this idea, which you already know: Define the layout of your UI by creating a tree of panels. The leaf nodes on the tree are what we used to call 'controls' way back in the day-- the things that the user interacts with, radio buttons and listboxes and such. The internal nodes are mostly concerned with layout; this kind of panel stacks its child panels vertically, that kind puts its children into a grid, etc. It's COMMON. Most of the UI-generating systems I've seen in the past twenty years are implementations of this, and the ones that aren't borrow from it. What's the word for this idea?

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• License validation and calling home

  - by VitalyB

  I am developing an application that, when bought, can be activated using a license. Currently I am doing offline validation which is a bit troubling to me. I am aware there is nothing to do against cracks (i.e modified binaries), however, I am thinking to trying to discourage license-key pirating. Here is my current plan: When the user activates the software and after offline validation is successful, it tries to call home and validate the license. If home approves of the license or if home is unreachable, or if the user is offline, the license gets approved. If home is reached and tells the license is invalid, validation fails. Licensed application calls home the same way every time during startup (in background). If license is revoked (i.e pirated license or generated via keygen), the license get deactivated. This should help with piracy of licenses - An invalid license will be disabled and a valid license that was pirated can be revoked (and its legal owner supplied with new license). Pirate-users will be forced to use cracked version which are usually version specific and harder to reach. While it generally sounds good to me, I have some concerns: Users tend to not like home-calling and online validation. Would that kind of validation bother you? Even though in case of offline/failure the application stays licensed? It is clear that the whole scheme can be thwarted by going offline/firewall/etc. I think that the bother to do one of these is great enough to discourage casual license sharing, but I am not sure. As it goes in general with licensing and DRM variations, I am not sure the time I spend on that kind of protection isn't better spent by improving my product. I'd appreciate your input and thoughts. Thanks!

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• How do I download a corrupted package again?

  - by user64720

  Ubuntu 12.04 can't install Firefox 13 update, because the package is corrupted. While attempting to install, returns this error (I translated it from my language to English). /var/cache/apt/archives/firefox_13.0+build1-0ubuntu0.12.04.1_i386.deb W: Waited for dpkg --assert-multi-arch but was not there - dpkgGo (10: There are no "child" processes). I can tell that the package at /var/cache/apt/archives/firefox_13.0+build1-0ubuntu0.12.04.1_i386.deb is corrupted, but even as admin, I can't delete it in order to be downloaded again. How should I proceed? EDIT: There was a single package causing this conflict, please report here to understand all the situation: Why can't I install from software center?

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• XNA - Inconsistent accessibility: parameter type is less accessible than method

  - by DijkeMark

  I have a level class in which I make a new turret. I give the turret the level class as parameter. So far so good. Then in the Update function of the Turret I call a function Shoot(), which has that level parameter it got at the moment I created it. But from that moment it gives the following error: Inconsistent accessibility: parameter type 'Space_Game.Level' is less accessible than method 'Space_Game.GameObject.Shoot(Space_Game.Level, string)' All I know it has something to do with not thr right protection level or something like that. The level class: public Level(Game game, Viewport viewport) { _game = game; _viewport = viewport; _turret = new Turret(_game, "blue", this); _turret.SetPosition((_viewport.Width / 2).ToString(), (_viewport.Height / 2).ToString()); } The Turret Class: public Turret(Game game, String team, Level level) :base(game) { _team = team; _level = level; switch (_team) { case "blue": _texture = LoadResources._blue_turret.Texture; _rows = LoadResources._blue_turret.Rows; _columns = LoadResources._blue_turret.Columns; _maxFrameCounter = 10; break; default: break; } _frameCounter = 0; _currentFrame = 0; _currentFrameMultiplier = 1; } public override void Update() { base.Update(); SetRotation(); Shoot(_level, "turret"); } The Shoot Function (Which is in GameObject class. The Turret Class inherited the GameObject Class. (Am I saying that right?)): protected void Shoot(Level level, String type) { MouseState mouse = Mouse.GetState(); if (mouse.LeftButton == ButtonState.Pressed) { switch (_team) { case "blue": switch (type) { case "turret": TurretBullet _turretBullet = new TurretBullet(_game, _team); level.AddProjectile(_turretBullet); break; default: break; } break; default: break; } } } Thanks in Advance, Mark Dijkema

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• Remember me or not?

  - by taeja87

  I was told to post this on webmasters instead of stackoverflow. Is it safe to have the remember me feature? Would it be somewhat safe (knowing it won't be 100% safe) to allow users to close their browser and come back still logged in? I am not exacting sure which way I should go after reading different things about safety. I learned about session fixation and implemented security to add more protection. From experience, if remember me is checked then only your username/email appears and requires you to re-enter your password. Other sites allow you to come in and out as much as you way without logging out after the browser has closed. If it is safe, what is the current best way of implementing remember/stay logged in? http://stackoverflow.com/questions/3531377/best-practise-for-remember-me-feature http://stackoverflow.com/questions/5087969/what-is-the-code-for-stay-logged-in-or-remember-me-while-user-login-in-php http://bytes.com/topic/php/answers/881197-stay-logged-remember-me-php-sessions-cookies http://security.stackexchange.com/questions/41/good-session-practices Also: The site I am working on is email & password login type.

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• Differentiating between user script input formats

  - by KChaloux

  I have a .NET project at work that provides a couple of (Iron)Python scripts to the customers, to allow them to customize the output of the program. The application generates code for certain machines, and supports a couple of different formats. Until recently, we only provided a script for one format. We're expanding upon that to include support for the others. If the user is using a script, they select their input script before generating the output code. A script designed for Format1 output is going to cause errors if they're trying to generate Format2 output. I need to deal with this. One option would just be to let the customers use common sense, and if they load the wrong script it will just fail, or worse, produce inaccurate data. I'm inclined to provide a little more protection than that. At the moment I'm considering putting a shebang-style comment line at the top of the script, ala: # OUTPUT - Format1 If the user tries to run a Format2 process with a Format1 script, it will warn them. Alternatively I could create different file extensions for the input scripts that vary by type. The file-type comment approach helps prevent the script from actually loading improperly, at the cost of failing to warn the user until they've already selected it, via a dialog box. Using different file extensions would allow me to cut down on visual clutter when providing a File Dialog, but doesn't actually stop them from loading the wrong script. So I'm really not sure if the right approach is to just leave it alone, or provide some safeguards.

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• Should I encrypt data in database?

  - by Tio

  I have a client, for which I'm going to do an Web application about patient care, managing patients, consults, history, calendars, everything about that basically. The problem is that this is sensitive data, patient history and such. The client insists on encrypting the data at the database level, but I think this is going to deteriorate the performance of the web app. ( But maybe I shouldn't be worried about this ) I've read the laws about data protection on health issues ( Portugal ), but isn't very specific about this ( I just questioned them about this, I'm waiting for their response ). I've read the following link, but my question is different, should I encrypt the data in the database, or not. One problem that I foresee in encrypting data, is that I'm going to need a key, this could be the user password, but we all know how user passwords are ( 12345 etc etc ), and generating a key I would have to store it somewhere, this means that the programmer, dba, whatever could have access to it, any thoughts on this? Even adding an random salt to the user password isn't going to solve the problem since I can always access it, and therefore decrypt the data.

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• Client/Server game even in solo: any big problem?

  - by Klaim

  I'm making a game which have strong basic design based on multiplayer but also should provide a really interesting and self-sufficient solo game. A bit like a real-time strategy game. The events and actions taken shouldn't be as massive and immediate as in a FPS, so you can also think the networking like for an RTS. It's a PC game, targetting Windows, MacOSX and Linux (Ubuntu & Fedora). It's programmed in C++, using a variety of open source libraries, so I have great (potential) control over the performances. So far I always considered that just making the game work with two applications, client & server, even in solo mode was ok. However, as I'm in the process of starting the network code I'm having doubts about if it's a good idea. I'm not a specialist so I might be missing something in my analysis. I see these pros and cons: Pros: The game works only one way so if I fix a bug it should apply on all game modes, whatever the distance with the server is; Basic networking issues would be detected early, including behaviour with the protection softwares (firewall) installed (i am not specialist so this might be wrong); Cons: I suppose that even if it should be really fast enough, networking client and server on the same computer would still be slower than no networking and message passing in (one) process memory. Maybe debugging would be more difficult? I don't have experience in this case but so far I assume that debugging with Visual Studio allows me to debug multiple process so it shouldn't be really different. Also, remote debugging. My question is: is there a big disadvantage that I missed? Or maybe there are advantages that I missed and that should encourage me to just continue with only client-server game sessions?

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• Using XA Transactions in Coherence-based Applications

  - by jpurdy

  While the costs of XA transactions are well known (e.g. increased data contention, higher latency, significant disk I/O for logging, availability challenges, etc.), in many cases they are the most attractive option for coordinating logical transactions across multiple resources. There are a few common approaches when integrating Coherence into applications via the use of an application server's transaction manager: Use of Coherence as a read-only cache, applying transactions to the underlying database (or any system of record) instead of the cache. Use of TransactionMap interface via the included resource adapter. Use of the new ACID transaction framework, introduced in Coherence 3.6.   Each of these may have significant drawbacks for certain workloads. Using Coherence as a read-only cache is the simplest option. In this approach, the application is responsible for managing both the database and the cache (either within the business logic or via application server hooks). This approach also tends to provide limited benefit for many workloads, particularly those workloads that either have queries (given the complexity of maintaining a fully cached data set in Coherence) or are not read-heavy (where the cost of managing the cache may outweigh the benefits of reading from it). All updates are made synchronously to the database, leaving it as both a source of latency as well as a potential bottleneck. This approach also prevents addressing "hot data" problems (when certain objects are updated by many concurrent transactions) since most database servers offer no facilities for explicitly controlling concurrent updates. Finally, this option tends to be a better fit for key-based access (rather than filter-based access such as queries) since this makes it easier to aggressively invalidate cache entries without worrying about when they will be reloaded. The advantage of this approach is that it allows strong data consistency as long as optimistic concurrency control is used to ensure that database updates are applied correctly regardless of whether the cache contains stale (or even dirty) data. Another benefit of this approach is that it avoids the limitations of Coherence's write-through caching implementation. TransactionMap is generally used when Coherence acts as system of record. TransactionMap is not generally compatible with write-through caching, so it will usually be either used to manage a standalone cache or when the cache is backed by a database via write-behind caching. TransactionMap has some restrictions that may limit its utility, the most significant being: The lock-based concurrency model is relatively inefficient and may introduce significant latency and contention. As an example, in a typical configuration, a transaction that updates 20 cache entries will require roughly 40ms just for lock management (assuming all locks are granted immediately, and excluding validation and writing which will require a similar amount of time). This may be partially mitigated by denormalizing (e.g. combining a parent object and its set of child objects into a single cache entry), at the cost of increasing false contention (e.g. transactions will conflict even when updating different child objects). If the client (application server JVM) fails during the commit phase, locks will be released immediately, and the transaction may be partially committed. In practice, this is usually not as bad as it may sound since the commit phase is usually very short (all locks having been previously acquired). Note that this vulnerability does not exist when a single NamedCache is used and all updates are confined to a single partition (generally implying the use of partition affinity). The unconventional TransactionMap API is cumbersome but manageable. Only a few methods are transactional, primarily get(), put() and remove(). The ACID transactions framework (accessed via the Connection class) provides atomicity guarantees by implementing the NamedCache interface, maintaining its own cache data and transaction logs inside a set of private partitioned caches. This feature may be used as either a local transactional resource or as logging XA resource. However, a lack of database integration precludes the use of this functionality for most applications. A side effect of this is that this feature has not seen significant adoption, meaning that any use of this is subject to the usual headaches associated with being an early adopter (greater chance of bugs and greater risk of hitting an unoptimized code path). As a result, for the moment, we generally recommend against using this feature. In summary, it is possible to use Coherence in XA-oriented applications, and several customers are doing this successfully, but it is not a core usage model for the product, so care should be taken before committing to this path. For most applications, the most robust solution is normally to use Coherence as a read-only cache of the underlying data resources, even if this prevents taking advantage of certain product features.

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• How do you create links with a NULL or # in Drupal?

  - by blunders

  Trying to create folders for links where the parent has no content, it's just a folder. Need to be able to insert #, but Drupal is saying it's not a link. Just want the user to click it and nothing happen, the child of that menu item will already be being displayed without a click. Version: Drupal 6 (appears worked in D5) I've attempted the following: '', #, <#>, empty, <empty>, null, <null>, blank, <blank>, <none>, none, <answer> ...just kidding. ERROR: The path '<insert_non-url>' is either invalid or you do not have access to it. Question, just ask -- thanks!

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