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  • Verbose Listing of All Application Layers/Tiers?

    - by leeand00
    I've looked at a few sites now, and I'm still struggling to find a complete listing of all the possible layers/tiers you can have in an application. From back in college (1999) I remember the following: Presentation Layer (Views) Application Layer (Controllers) Business Logic Layer (API/Rules) Persistence Layer (Database/Object Persistence/Model) I'm not advocating that they all be used...especially when you consider that too many layers/tiers could lead to an increase in complexity...I just wondered what the complete list might look like... Based on a couple of blogs I've found several different answers...and Javascript and client side technologies seem to have leaked in adding more client-side layers according to one blog the client side tier might even consist of Behavior Layer (Javascript, Flash) Presentation Layer (CSS/Images) Note: I though the entire client side layer was the presentation layer Structure Layer (XHTML, HTML) I'm just trying to get an abstract idea of what all the possible layers might be, (even though some people call them different things)

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  • Unique Features of bash compared to zsh

    - by Tim
    I have been a zsh user for quite some time (before that tcsh and before that csh). I am quite happy with it, but was wondering if there are any compelling features of bash that do not exist in zsh. And conversely, are there zsh features which do not exist in bash. My current feel is that bash is better: If you are familiar with it already and don't want to learn new syntax. It is going to exist on most all *nix machines by default, whereas zsh may be an extra install. Not trying to start a religious battle here, which is why I'm just looking for features which exist in only one of the shells.

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  • Odd behavior on Shift-{Esc,Fx}

    - by ??????? ???????????
    Sometimes, when changing between the modes in Vim, I forget to take my finger off the Shift key. This innocent mistake is probably part of the luggage carried over from other terminals, but I have never seen my input treated this way. After changing from command mode to input mode, if I hit the Esc key while the Shift key is down, Vim will display <9b (Control Sequence Introducer) instead of switching to the command mode. At least two work-arounds to this intended behavior are available on the mintty site (faq, issue). " Avoiding escape timeout issues in vim :let &t_ti.="\e[?7727h" :let &t_te.="\e[?7727l" :noremap <EscO[ <Esc :noremap! <EscO[ <Esc " Remap escape :imap <special <CSI <ESC My question is about the syntax and the meaning of the first solution. From the looks of it, it seems like t_ti is being assigned a literal value, but I'm not sure why the "c address-of" operator is required. I'm also not sure why there are two noremap statements.

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  • Partial generic type inference possible in C#?

    - by Lasse V. Karlsen
    I am working on rewriting my fluent interface for my IoC class library, and when I refactored some code in order to share some common functionality through a base class, I hit upon a snag. Note: This is something I want to do, not something I have to do. If I have to make do with a different syntax, I will, but if anyone has an idea on how to make my code compile the way I want it, it would be most welcome. I want some extension methods to be available for a specific base-class, and these methods should be generic, with one generic type, related to an argument to the method, but the methods should also return a specific type related to the particular descendant they're invoked upon. Better with a code example than the above description methinks. Here's a simple and complete example of what doesn't work: using System; namespace ConsoleApplication16 { public class ParameterizedRegistrationBase { } public class ConcreteTypeRegistration : ParameterizedRegistrationBase { public void SomethingConcrete() { } } public class DelegateRegistration : ParameterizedRegistrationBase { public void SomethingDelegated() { } } public static class Extensions { public static ParameterizedRegistrationBase Parameter<T>( this ParameterizedRegistrationBase p, string name, T value) { return p; } } class Program { static void Main(string[] args) { ConcreteTypeRegistration ct = new ConcreteTypeRegistration(); ct .Parameter<int>("age", 20) .SomethingConcrete(); // <-- this is not available DelegateRegistration del = new DelegateRegistration(); del .Parameter<int>("age", 20) .SomethingDelegated(); // <-- neither is this } } } If you compile this, you'll get: 'ConsoleApplication16.ParameterizedRegistrationBase' does not contain a definition for 'SomethingConcrete' and no extension method 'SomethingConcrete'... 'ConsoleApplication16.ParameterizedRegistrationBase' does not contain a definition for 'SomethingDelegated' and no extension method 'SomethingDelegated'... What I want is for the extension method (Parameter<T>) to be able to be invoked on both ConcreteTypeRegistration and DelegateRegistration, and in both cases the return type should match the type the extension was invoked on. The problem is as follows: I would like to write: ct.Parameter<string>("name", "Lasse") ^------^ notice only one generic argument but also that Parameter<T> returns an object of the same type it was invoked on, which means: ct.Parameter<string>("name", "Lasse").SomethingConcrete(); ^ ^-------+-------^ | | +---------------------------------------------+ .SomethingConcrete comes from the object in "ct" which in this case is of type ConcreteTypeRegistration Is there any way I can trick the compiler into making this leap for me? If I add two generic type arguments to the Parameter method, type inference forces me to either provide both, or none, which means this: public static TReg Parameter<TReg, T>( this TReg p, string name, T value) where TReg : ParameterizedRegistrationBase gives me this: Using the generic method 'ConsoleApplication16.Extensions.Parameter<TReg,T>(TReg, string, T)' requires 2 type arguments Using the generic method 'ConsoleApplication16.Extensions.Parameter<TReg,T>(TReg, string, T)' requires 2 type arguments Which is just as bad. I can easily restructure the classes, or even make the methods non-extension-methods by introducing them into the hierarchy, but my question is if I can avoid having to duplicate the methods for the two descendants, and in some way declare them only once, for the base class. Let me rephrase that. Is there a way to change the classes in the first code example above, so that the syntax in the Main-method can be kept, without duplicating the methods in question? The code will have to be compatible with both C# 3.0 and 4.0. Edit: The reason I'd rather not leave both generic type arguments to inference is that for some services, I want to specify a parameter value for a constructor parameter that is of one type, but pass in a value that is a descendant. For the moment, matching of specified argument values and the correct constructor to call is done using both the name and the type of the argument. Let me give an example: ServiceContainerBuilder.Register<ISomeService>(r => r .From(f => f.ConcreteType<FileService>(ct => ct .Parameter<Stream>("source", new FileStream(...))))); ^--+---^ ^---+----^ | | | +- has to be a descendant of Stream | +- has to match constructor of FileService If I leave both to type inference, the parameter type will be FileStream, not Stream.

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  • Domain Driven Design And The Entity Framework

    - by Hossein
    hi, I'm new to DDD and i want to use entity framework v4.0 (shipped with .net 4.0) in my new project. since i have few time to learn DDD and entity framework, which books are good for me to read first?! i'm going to first read Domain-Driven Design Tackling Complexity in the Heart of Software by Eric Evan and next Pro Entity Framework 4.0 (Apress Scott Klein)... the problem here is Eric Evan's book is too abstract,I want to know if the Pro Entity framework 4.0 is complete enough i just skip the first book! in the end recommend me some good books in DDD and Entity Framework Thanks

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  • Problems installing Ruby 1.9.2 and rvm on Debian Lenny

    - by Dave Everitt
    I have currently have Ruby 1.9.1 (bad) and want to install 1.9.3 under rvm. However, rvm requirements gives a long list: install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion But I've hit a problem here: /# apt-get install libreadline6 Reading package lists... Done Building dependency tree Reading state information... Done E: Couldn't find package libreadline6 ...and (I imagine after just hunting down a Debian source to download curl) finding these packages isn't going to be a picnic. Given that there are few packages to install before I can get rvm to install Ruby 1.9.3, what's a good way forward? My sources.list: deb http://archive.debian.org/debian/ lenny main contrib

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  • Apache repeatedly crashing in OS X 10.6.5

    - by ltackett
    I want to be using the system default Apache available through Web Sharing, not MAMP. Other questions/answers related to similar problems have not helped. Initially, I had MAMP running, but I stopped it because I thought it might be causing a conflict, that didn't work. I also had an issue with apachectl related to the 10.6.5 update, which I fixed. Apachectl reports no syntax errors and seems to be working fine to start|stop|restart apache. Here are the errors that repeat. 12/29/10 11:53:28 AM Firewall[63] httpd is listening from ::ffff:0.0.0.0:80 proto=6 12/29/10 11:53:29 AM com.apple.launchd[1] (org.apache.httpd[8618]) Exited with exit code: 1 12/29/10 11:53:29 AM com.apple.launchd[1] (org.apache.httpd) Throttling respawn: Will start in 10 seconds This is not my area of expertise, so I hope that's enough info to go by.

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  • Trouble editing ~/.bash_profile: -bash: $'\r': command not found

    - by Dave
    I installed CygWin on Windows 7. Using Notepad, I edited my ~/.bash_profile file to add on to the PATH variable … PATH="${PATH}:/cygdrive/c/apache-ant-1.8.2/bin" Now, when I SSH in to my Windows machine, I get this error … -bash: $'\r': command not found -bash: $'\r': command not found -bash: $'\r': command not found -bash: $'\r': command not found -bash: $'\r': command not found -bash: /home/dev/.bash_profile: line 39: syntax error: unexpected end of file and my PATH is not set. Anyone know how I can correct this?

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  • How to resolve 'Error Dependency is not satisfiable: libascound2' on ubuntu

    - by michael
    Hi, I am trying to install skype-ubuntu-intrepid_2.1.0.91-1.i386.deb on ubuntu 8.04: But in the Package installer, I get 'Error Dependency is not satisfiable: libascound2'. And I have tried. $ sudo apt-get install libasound2 [sudo] password for novarra: Reading package lists... Done Building dependency tree Reading state information... Done libasound2 is already the newest version. The following packages were automatically installed and are no longer required: linux-headers-2.6.24-24-generic libdns35 linux-headers-2.6.24-24 Use 'apt-get autoremove' to remove them. I appreciate if anyone can help me with it.

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  • How do people prove the correctness of Computer Vision methods?

    - by solvingPuzzles
    I'd like to pose a few abstract questions about computer vision research. I haven't quite been able to answer these questions by searching the web and reading papers. How does someone know whether a computer vision algorithm is correct? How do we define "correct" in the context of computer vision? Do formal proofs play a role in understanding the correctness of computer vision algorithms? A bit of background: I'm about to start my PhD in Computer Science. I enjoy designing fast parallel algorithms and proving the correctness of these algorithms. I've also used OpenCV from some class projects, though I don't have much formal training in computer vision. I've been approached by a potential thesis advisor who works on designing faster and more scalable algorithms for computer vision (e.g. fast image segmentation). I'm trying to understand the common practices in solving computer vision problems.

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  • Can't install php5-apc from dotdeb source in Debian 6

    - by YNT
    I can't install php5-apc: ~# apt-get install php5-apc Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: php5-apc : Depends: php5-common (= 5.3.19-1~dotdeb.0) but 5.3.8-2 is to be installed E: Broken packages Have fresh Debian 6 and deb http://packages.dotdeb.org squeeze all deb-src http://packages.dotdeb.org squeeze all in source.list. P. S. I'm not very experienced—just trying to set up a server by the tutorial.

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  • Too many argumants for function

    - by Stas Kurilin
    I'm starting learning Lisp with Java background. In SICP's exercise there is many tasks where students should create abstract functions with many parameters, like (define (filtered-accumulate combiner null-value term a next b filter)...) in exercise 3.11. In Java (language with safe, static typing discipline) - method with more than 4 arguments usually smells, but in Lisp/Scheme it doesnt, does it? I'm wandering how many arguments do you use in you functions? If you use it in production, do you make such many layers?

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  • Clear scr does not work

    - by idea_
    I haven't been able to use the "clear scr" command in a while, as I get the following error: root@server:~# clear The program 'clear' is currently not installed. You can install it by typing: apt-get install ncurses-bin bash: clear: command not found root@server:~# apt-get install ncurses-bin Reading package lists... Done Building dependency tree Reading state information... Done ncurses-bin is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. I'm using Ubuntu Server 9.10. I did some development with the ncurses library a while ago, so I've no doubt broken something.

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  • Dump output from REPL

    - by Ankit Soni
    I'm writing SML programs, and I'd like a way to quickly see the output from running a program in the REPL without actually running the REPL (to quickly see if a program has syntax errors - I plan to use this as a make program for .sml files in vim to view the output inside vim).. Currently, I have this: sml file.sml | echo -e "\004" So it runs the program, and then echoes Ctrl-D to exit the REPL. The problem is that its too quick to send the Ctrl-D key, so there is no output. I tried this too: sml file.sml | sleep 2 ; echo -e "\004" But that isn't doing it either. Any ideas on how I can get a dump of the output from the REPL?

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  • Gitweb showing opposite colors for added and removed text

    - by Maddy
    Hi, I have installed gitweb in our servers. And it started showing the branches and the commit diffs. But the syntax highlighting is opposite particularly for added and removed text. Supposed added text should be in green and removed text should be red. But I am seeing an opposite one. I can hack gitweb.css to get my job done. But felt like knowing why such issue is happening? And what might be the proper fix. (if any one knows good themes for gitweb? please mention)

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  • How to get Firefox Greasemonkey script to use a local cascading stylesheet?

    - by Umber Ferrule
    What's the correct syntax to link to a CSS file in the same directory as a Greasemonkey JavaScript? I've tried the following but it doesn't work: var cssNode = document.createElement('link'); cssNode.type = 'text/css'; cssNode.rel = 'stylesheet'; cssNode.href = 'example.css'; cssNode.media = 'screen'; cssNode.title = 'dynamicLoadedSheet'; document.getElementsByTagName("head")[0].appendChild(cssNode); If I can get this to work, it would be a lot easier than encasing CSS changes in JavaScript.

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  • Ubuntu - Create a link to a specified directory so I can easily change to that directory

    - by Denby
    Is it possible to create a symlink to a directory, like /var/lib/tomcat6/webapps/MyWar that I can access from everywhere? I want to be able to say cd myapp from anywhere in the directory tree and go to that directory. Is it only possible in the directory where I create the symlink? Do I have to update my ~/.bashrc file to include an alias like: alias myapp="cd /var/lib/tomcat6/webapps/MyWar" and then just type myapp from anywhere? What is the best way to handle this situation so I don't always have to type in the long directory? I also want to be able to use that parameter in say a copy command, so the alias wouldn't help in that situation. Hopefully I can do something similar where ~ maps to the home directory in any command.

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  • Touch Screen Ubuntu 10.04LTS

    - by WalterJ89
    I'm trying to get a touch screen working with Ubuntu 10.04LTS (64bit) -it is a serial touchsceen, connected at /dev/ttyS0 ,i know that works because I get garbage in the terminal when I enable it. -before the screen used a 3m driver (I believe) in XP. My knowledge of Linux is passive so I generally pick up something when I need it. To get this working I came accross a lot of tutorials (a lot outdated a bit), I'm still at a loss to get this work. I'm not sure where to put linux drivers (/usr/ or /dev/?) most tutorials kind of skip over that part. I have tried editing the /etc/X11/xorg.conf unsuccessfully. I'm not sure what the syntax for that is supposed to be. Thank You

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  • Metacity toggle fullscreen not working under Lucid; worked with Karmic.

    - by Andy
    Hi all, I'm working on a 11" screen, so I frequently want to use applications in fullscreen. I'm no expert on GNOME, but I remember doing a search a while back, and finding out about metacity, and how to use that to allow any window to be put in fullscreen. This worked great on Karmic, but it doesn't seem to be working under Lucid. Here's what I do. Run gconf-editor. Go to /apps/metacity/window_keybindings. Change toggle_fullscreen from disabled to <Control><Shift>F. Unfortunately it doesn't work. I know that I've got the right syntax because I can see other shortcuts and use them as a template. I have no idea what's wrong, and no idea how to move forwards/debug. Any suggestions much appreciated. TIA Andy

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  • shibboleth: tomcat failing to start IdP listener

    - by HorusKol
    I have installed a Shibboleth Identity Provider as per http://www.edugate.ie/workshop-guides/shibboleth-2-identity-provider-installation-linux-debian-or-ubuntu However, testing only gave me a 404 from Tomcat, and when I checked the Tomcat logs, I saw that the IdP listener was not starting: 10/01/2011 11:25:31 AM org.apache.catalina.startup.HostConfig deployDescriptor INFO: Deploying configuration descriptor idp.xml 10/01/2011 11:25:32 AM org.apache.catalina.core.StandardContext start SEVERE: Error listenerStart 10/01/2011 11:25:32 AM org.apache.catalina.core.StandardContext start SEVERE: Context [/idp] startup failed due to previous errors The IdP descriptor file has the following context: <Context docBase="/opt/shibboleth-idp/war/idp.war" privileged="true" antiResourceLocking="false" antiJARLocking="false" unpackWAR="true" /> I have confirmed that the WAR file is located as the Context above specifies - as I have found similar issues from other people where the WAR file was not found. However, the logs posted by those people indicate that the descriptor file was correctly read by Tomcat and their problem was with the WAR file itself. I'm assuming this is some kind of syntax error with the idp.xml, but cannot determine what it might be. Also - setting the Tomcat logging level to FINEST does not provide any additional information in the logs for this error.

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  • Why can't I copy files from a mac to a samba share?

    - by chris
    I have a share set up on my ubuntu 10.04 box, and the mac can see it, connect to it, and sort of write to it. When I try to copy a whole tree to the share, I get an error saying "The operation cannot be completed because you don't have access to some of the items". If I zip the directory, and copy that over, it succeeds. Any explanation? My smb.conf: [global] workgroup = wg netbios name = ubuntu security = user [Wife Debris] path = /home/wife/wifedebris read only = no guest ok = no force user = wife force group = wife

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  • Advantage of using a static member function instead of an equivalent non-static member function?

    - by jonathanasdf
    I was wondering whether there's any advantages to using a static member function when there is a non-static equivalent. Will it result in faster execution (because of not having to care about all of the member variables), or maybe less use of memory (because of not being included in all instances)? Basically, the function I'm looking at is an utility function to rotate an integer array representing pixel colours an arbitrary number of degrees around an arbitrary centre point. It is placed in my abstract Bullet base class, since only the bullets will be using it and I didn't want the overhead of calling it in some utility class. It's a bit too long and used in every single derived bullet class, making it probably not a good idea to inline. How would you suggest I define this function? As a static member function of Bullet, of a non-static member function of Bullet, or maybe not as a member of Bullet but defined outside of the class in Bullet.h? What are the advantages and disadvantages of each?

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  • sqlite ERROR no such column

    - by Richard
    Hi, Does anyone here have some experience with this error? Only If I use the WHERE clause, I get this error. I use php PDO to get the results. And this is my simple table $sql = "CREATE TABLE samenvatting ( stem_id INTEGER PRIMARY KEY AUTOINCREMENT, poll_id TEXT, stem_waarde_id TEXT, totaal INTEGER )"; $crud->rawQuery($sql); $poll_id = "somepoll"; $records = $crud->rawSelect('SELECT * FROM samenvatting WHERE poll_id=´.$poll_id); pdo abstract class public function conn() { isset($this->username); isset($this->password); if (!$this->db instanceof PDO) { $this->db = new PDO($this->dsn, $this->username, $this->password); $this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } } public function rawSelect($sql) { $this->conn(); return $this->db->query($sql); } Thanks, Richard

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  • CentOS 6.5 SVN https - Unknown DAV provider: svn

    - by Programster
    I am trying to setup a CentOS 6.5 64bit server with SVN over HTTPS. Unfortunately after configuring the /etc/httpd/conf.d/subversion.conf file as follows (changed paths): <Location /repos> DAV svn SVNParentPath /path/to/svn/repos # Limit write permission to list of valid users <LimitExcept GET PROPFIND OPTIONS REPORT> # Require SSL connection for password protection SSLRequireSSL AuthType Basic AuthName "Authorization Realm" AuthUserFile /path/to/passwdfile Require valid-user </LimitExcept> </Location> I get the following error message when restarting http: Starting httpd: Syntax error on line 3 of /etc/httpd/conf.d/subversion.conf: Unknown DAV provider: svn I have triple checked that I have the mod_dav_svn package already installed: Package mod_dav_svn-1.6.11-10.el6_5.x86_64 already installed and latest version Is my config wrong or are there other packages I need to set up?

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  • Public folder emails not being delivered

    - by Rob
    Hello, We have just introduced an Exchange 2010 installation into our existing Exchange 2003 (all standard) environment. We make a lot of use of our Public Folders in 2003, so I am wanting to make a small PF tree in the 2010 system to test some applications against. I have created a few public folders in the 2010 public folder management tool, and mail enabled them, gotten email addresses, etc. However, mail will not be delivered, it queues on my existing 2003 Exchange server's 'Local Delivery' queue, and eventually times out and bounces. I guess the Exchange 'system' including the new 2010 server thinks that all public folder email must need to be delivered to the old 2003 server. Is it possible for me to have two public folder databases that each receive mail? If so, is there something I am missing to enable this? Thanks -R

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