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• How to model in J2EE / JEE?

  - by Harry

  Let's say, I have decided to go with J(2)EE stack for my enterprise application. Now, for domain modelling (or: for designing the M of MVC), which APIs can I safely assume and use, and which I should stay away from... say, via a layer of abstraction? For example, Should I go ahead and litter my Model with calls to Hibernate/JPA API? Or, should I build an abstraction... a persistence layer of my own to avoid hard-coding against these two specific persistence APIs? Why I ask this: Few years ago, there was this Kodo API which got superseded by Hibernate. If one had designed a persistence layer and coded the rest of the model against this layer (instead of littering the Model with calls to specific vendor API), it would have allowed one to (relatively) easily switch from Kodo to Hibernate to xyz. Is it recommended to make aggressive use of the *QL provided by your persistence vendor in your domain model? I'm not aware of any real-world issues (like performance, scalability, portability, etc) arising out of a heavy use of an HQL-like language. Why I ask this: I would like to avoid, as much as possible, writing custom code when the same could be accomplished via query language that is more portable than SQL. Sorry, but I'm a complete newbie to this area. Where could I find more info on this topic? Many thanks in advance. /HS

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• trying to reenter IT field after a break of over 5 years

  - by josephj1989

  Hello I have had some misfortune in life - I was unwell and had to stay out of work for an extended period of about 5 years.Before that I used to work as an Oracle/Oracle Ebusiness suite consultant (I was charging very good contract rates). But now I am fully recovered ,feeling sharper than ever. But there arent many opportunities in my areas of expertise in a small market like New Zealand and the long absence is no help either. So for the last 5 months I have been training myself in C# ,ASP .NET,WEB technologies like HTML,JQuery,CSS and also SQL Server.I had some previous experience with JAVA and VB .NET (few months). But I am fully confident of my abilities and believe I can hit the ground running given a chance.I used to be an expert with SQL and C language and these skills are portable to SQL Server and C#. Another problem I face is my age- I am over 50. What is your opinion - Am I doing the right thing. Can I get back into an IT career-I am willing to start all over again at a junior level, I am really facing a crisis in my life.

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• User Defined Conversions in C++

  - by wash

  Recently, I was browsing through my copy of the C++ Pocket Reference from O'Reilly Media, and I was surprised when I came across a brief section and example regarding user-defined conversion for user-defined types: #include <iostream> class account { private: double balance; public: account (double b) { balance = b; } operator double (void) { return balance; } }; int main (void) { account acc(100.0); double balance = acc; std::cout << balance << std::endl; return 0; } I've been programming in C++ for awhile, and this is the first time I've ever seen this sort of operator overloading. The book's description of this subject is somewhat brief, leaving me with a few unanswered questions about this feature: Is this a particularly obscure feature? As I said, I've been programming in C++ for awhile and this is the first time I've ever come across this. I haven't had much luck finding more in-depth material regarding this. Is this relatively portable? (I'm compiling on GCC 4.1) Can user-defined conversions to user defined types be done? e.g. operator std::string () { /* code */ }

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• Ruby integer to string key

  - by Gene

  A system I'm building needs to convert non-negative Ruby integers into shortest-possible UTF-8 string values. The only requirement on the strings is that their lexicographic order be identical to the natural order on integers. What's the best Ruby way to do this? We can assume the integers are 32 bits and the sign bit is 0. This is successful: (i >> 24).chr + ((i >> 16) & 0xff).chr + ((i >> 8) & 0xff).chr + (i & 0xff).chr But it appears to be 1) garbage-intense and 2) ugly. I've also looked at pack solutions, but these don't seem portable due to byte order. FWIW, the application is Redis hash field names. Building keys may be a performance bottleneck, but probably not. This question is mostly about the "Ruby way".

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• Creating serializeable unique compile-time identifiers for arbitrary UDT's.

  - by Endiannes

  I would like a generic way to create unique compile-time identifiers for any C++ user defined types. for example: unique_id<my_type>::value == 0 // true unique_id<other_type>::value == 1 // true I've managed to implement something like this using preprocessor meta programming, the problem is, serialization is not consistent. For instance if the class template unique_id is instantiated with other_type first, then any serialization in previous revisions of my program will be invalidated. I've searched for solutions to this problem, and found several ways to implement this with non-consistent serialization if the unique values are compile-time constants. If RTTI or similar methods, like boost::sp_typeinfo are used, then the unique values are obviously not compile-time constants and extra overhead is present. An ad-hoc solution to this problem would be, instantiating all of the unique_id's in a separate header in the correct order, but this causes additional maintenance and boilerplate code, which is not different than using an enum unique_id{my_type, other_type};. A good solution to this problem would be using user-defined literals, unfortunately, as far as I know, no compiler supports them at this moment. The syntax would be 'my_type'_id; 'other_type'_id; with udl's. I'm hoping somebody knows a trick that allows implementing serialize-able unique identifiers in C++ with the current standard (C++03/C++0x), I would be happy if it works with the latest stable MSVC and GNU-G++ compilers, although I expect if there is a solution, it's not portable.

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• SELECT SQL Variable - should i avoid using this syntax and always use SET?

  - by Sholom

  Hi All, This may look like a duplicate to here, but it's not. I am trying to get a best practice, not a technical answer (which i already (think) i know). New to SQL Server and trying to form good habits. I found a great explanation of the functional differences between SET @var = and SELECT @var = here: http://vyaskn.tripod.com/differences_between_set_and_select.htm To summarize what each has that the other hasn't (see source for examples): SET: ANSI and portable, recommended by Microsoft. SET @var = (SELECT column_name FROM table_name) fails when the select returns more then one value, eliminating the possibility of unpredictable results. SET @var = (SELECT column_name FROM table_name) will set @var to NULL if that's what SELECT column_name FROM table_name returned, thus never leaving @var at it's prior value. SELECT: Multiple variables can be set in one statement Can return multiple system variables set by the prior DML statement SELECT @var = column_name FROM table_name would set @var to (according to my testing) the last value returned by the select. This could be a feature or a bug. Behavior can be changed with SELECT @j = (SELECT column_name FROM table_name) syntax. Speed. Setting multiple variables with a single SELECT statement as opposed to multiple SET/SELECT statements is much quicker. He has a sample test to prove his point. If you could design a test to prove the otherwise, bring it on! So, what do i do? (Almost) always use SET @var =, using SELECT @var = is messy coding and not standard. OR Use SELECT @var = freely, it could accomplish more for me, unless the code is likely to be ported to another environment. Thanks

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• transferring binary files between systems

  - by tim

  Hi guys I'm trying to transfer my files between 2 UNIX clusters, the data is pure numeric (vectors of double) in binary form. Unfortunately one of the systems is IBM ppc997 and the other is AMD Opteron, It seems the format of binary numbers in these systems are different. I have tried 3 ways till now: 1- Changed my files to ASCII format (i.e. saved a number at each line in a text file), sent them to the destination and changed them again to binary on the target system (they both are UNIX, no end of line character difference??!) 2- Sent pure binaries to the destination 3- used uuencode sent them to the destination and decoded them Unfortunately any of these methods does not work (my code in the destination system generates garbage, while it works on the first system, I'm 100% sure the code itself is portable). I don't know what else I can do? Do you have any idea? I'm not a professional, please don't use computer scientists terminology! And: my codes are in C, so by binary I mean a one to one mapping between memory and hard disk. Thanks

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• Is there any possibility of rendering differences betweeen firefox 3 and 3.5 and IE 7 and 8, even if

  - by metal-gear-solid

  I'm making a site for European client and he said Firefox 3 and IE 7 and 8 has more user than others browser for desktop in Europe http://gs.statcounter.com/#browser_version-eu-monthly-200812-201001-bar I've only IE 7 and Firefox 3.5.7 installed in my PC. Should I download portable Firefox 3.0 and test in it too even if I'm not using any new css property/selector which only has support in Firefox 3.5 or testing in 3.5.7 would be enough? And for IE testing in IE 7 would be enough or should i check my site in IE8 (downloading VPC image of IE8 and testing in VM) even if I'm not using any new css property/selector which only has support in IE8? Or is it necessary to use <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" /> in <head> ? But what will happen when user will switch compatibility mode to IE 8 default rendering mode? Can we make site compatible in IE 7 and 8 both without using <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />? If yes, then what special we need to do.care/consider in css to make site identical in both?

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• Determining presence of prototype with correct return type

  - by R..

  Here's a random problem in C black magic I just came up with: Write a function that returns 1 if malloc has been prototyped to return a pointer type and 0 if malloc has a return type of int (either implicitly or due to wrong prototype), without invoking any implementation-defined or undefined behavior. I believe it's solvable, but I haven't worked out the solution. Note that calling the function cannot be necessary and in fact is not possible since calling a function with the incorrect prototype is undefined behavior. I have some ideas for ingredients but I think it makes for a better puzzle (and possibly more diverse ideas) if I leave them out for now. I don't need the solution for any immediate use, but it could be handy in configure scripts and such. Update: A better example of the usefulness (with strdup instead of malloc): #undef strdup #define strdup(x) (strdup_has_proto ? strdup((x)) : my_strdup((x))) i.e. being able to implement X_has_proto as an expression at the source level could be a portable way to use functions which a system might or might not have, and fall back on a local replacement, without needing any separate configure step.

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• Error "initializer element is not constant" when trying to initialize variable with const

  - by tomlogic

  I get an error on line 6 (initialize my_foo to foo_init) of the following program and I'm not sure I understand why. typedef struct foo_t { int a, b, c; } foo_t; const foo_t foo_init = { 1, 2, 3 }; foo_t my_foo = foo_init; int main() { return 0; } Keep in mind this is a simplified version of a larger, multi-file project I'm working on. The goal was to have a single constant in the object file, that multiple files could use to initialize a state structure. Since it's an embedded target with limited resources and the struct isn't that small, I don't want multiple copies of the source. I'd prefer not to use: #define foo_init { 1, 2, 3 } I'm also trying to write portable code, so I need a solution that's valid C89 or C99. Does this have to do with the ORGs in an object file? That initialized variables go into one ORG and are initialized by copying the contents of a second ORG? Maybe I'll just need to change my tactic, and have an initializing function do all of the copies at startup. Unless there are other ideas out there?

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• Google Talk Chat/Conference Solutions

  - by Adam Davis

  I started using the old confbot python conference script in 2005 for my family. This essentially implements an IRC like conference room over Google Talk (or any Jabber/XMPP server). It has significantly increased family communication, and has become rather indispensable due to this. Recently it's begun to have severe problems (people can't see each other in the conference room) which has nearly killed the usefulness of it. Before I develop my own software or debug confbot (probably not - it uses an older jabber library that hasn't been updated since 2003) I wanted to see what other solutions exist that meet our needs: Supports Google Talk (Sorry, I'm not going to try to convince everyone involved to move to a new IM or other client) Free and open source (ideal, but not required) Runs on Windows (Not a web service run by someone else) Implements basic functionality such as kick/ban, emotes Remembers who joined the conference room across restarts Obeys Do Not Disturb and Busy status Archives all activity -Adam

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• Win7 playback of dvr-ms files stutters

  - by Jim Lynn

  I've just had to install Windows 7 on my Media Center machine because my Vista installation had a faulty drive. I've got the latest drivers that I can find - Intel 945GM integrated Graphics, Realtek audio drivers. Things are working OK with one exception. Playback of old recordings, from dvr-ms format files, is choppy. The picture freezes for a fraction of a second, then quickly catches up. The sound is uninterrupted and doesn't pause. These freezes happen once every 5 seconds or so. It's very regular. Playback of Live TV from the digital tuner is perfectly smooth. DVD playback is perfectly smooth. As an experiment, I used the MPEG editing package VideoReDo to create a small test file in three different formats. This program takes the raw MPEG streams and repackages them into the desired container. I took the same clip and created three files in three formats: dvr-ms (Microsoft's old recorded TV format); mpg (standard MPEG); and ts (raw MPEG transport stream of the kind often produced by PVRs). When these three files are played back under Windows 7, the mpg and ts files play smoothly, but the dvr-ms file stutters. The last piece of data I have is that two other Windows 7 machines can play back dvr-ms files smoothly with no stuttering. One is a netbook, with less grunt than the media centre. So there must be something specific about my Media Center machine that's causing the problem. Does anyone have any idea where I can look now? I don't know much about AV software, codecs, filter graphs etc. but I suspect that's where the problem lies. Rendering the video isn't the problem, but extracting the streams is. How would I go about diagnosing the problem? Edited to add: I just used the GraphStudio tool to look at the filter graph on the offending PC. The filter graph it uses by default for dvr-ms looks identical to the other machines, and, interestingly, when I play the files using GraphStudio they run smoothly. Under Windows Media Player and Windows Media Center they stutter. I'd like to see the filter graph for WMP but GraphStudio won't show it. It looks like WMP and WMC are using a different decoding path to GraphStudio. Edited again to add: Today I purchased a new HDTV. The same Media Center driving the TV at 1080p is now playing back the old Recorded TV files smoothly, without stuttering. So whatever the cause of the original problem, using a different resolution seems to have removed the problem. It might also explain why nobody else has had this problem. I doubt many people use Media Centre with a 14in portable TV.

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• unusual backspace behavior in mac terminal

  - by Brandon

  I'm trying to figure out how to get ssh sessions to work how I want using the terminal app on mac os x. I'm used to using PuTTY on windows, where backspace means backspace. On mac when I press delete/backspace on mac it deletes the character following the cursor instead of the one before. I turned on Delete sends Ctrl + H, and that works most of the time, but sometimes it just shows on the screen as ^H this is typically at prompts from some custom python scripts on the box I log into. This doesn't happen with PuTTY on windows. Btw I'm logging into a Ubuntu Linux server running openssh. Any idea what I need to do so that backspace is consistently backspace.

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• Sending ctrl-backslash from Windows to Linux using Synergy

  - by jrbushell

  I'm using Synergy+ to share the keyboard and mouse between a Windows and a Linux (Red Hat) PC. The Windows box is the server, Linux is the client, and both are running version 1.3.4. My Windows box is set up for English UK keyboard. In a Linux terminal window, Ctrl+\ (backslash) sends a quit signal to the currently running program - useful to kill a Python script that's run amok, for example. When I try to do this via synergy, Ctrl+- (minus) is sent instead. This has the undesired effect of resizing my terminal window :( Backslash on its own and Shift-backslash = pipe both work fine. Any ideas what's happening?

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• Linux Email Server Auto-Reply

  - by Robert Smith

  I need to setup a mail server that has the following functionality: if a user sends an email to a specific address on this server, the server must first check if the email has a PDF attachment, do some processing to that PDF file and then reply to the user's initial mail with the new PDF file attached. My question is how would it be possible to achieve this functionality, and what software / mail server do you recommend? I'm thinking that it can be solved the following way: when the server receives a new email it executes an external Python script that checks the attachment, processes the PDF file and then sends it back in the user's mailbox. What mail server would be able to do this, and what configurations does it need?

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• Stop a runaway launchd process on OS X Leopard

  - by Skylarking

  I created a launchd .plist file to in order to have a python script run every hour. I ended up editing and later deleting the .plist file ( in /Library/LaunchDaemons )... but somehow launchd is still trying to run the script.. The file that the original .plist was calling is also no longer present ( it was in /usr/bin ).. Now every 10 seconds launchd is still attempting to run the script, fails, and respawns... I tried fixing this with Lingon.... to no avail.. Is there a way to kill this process for good? I tried logging out and restarting as well... Machine is running 10.5.8

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• Import/rip/convert DVD to Adobe Premiere Pro for Mac

  - by alexyu2010

  For those who want to edit their videos, Adobe Premiere Pro will inevitably a good choice, it is a professional, real time, timeline based video editing software application that supports many video editing cards and plug-ins for accelerated processing, additional file format support and video/audio effects. Although Adobe Premiere Pro is said to be for professionals, is not so complicated that a hobbyist can't excel at using it in an hour or so. General file formats supported by Adobe Premiere Pro Up to now, Adobe Creative Suite has released several versions of Adobe Premiere Pro, including Adobe Premiere 1.0, Adobe Premiere 2.0, Adobe Premiere Pro CS3, Adobe Premiere Pro CS4 and the newly published Adobe Premiere Pro CS5. Although I saw diversity in file formats they support, I did find some common file formats supported by all of them, such as AVI, MOV, MPG. Importing DVD, Adobe Premiere Pro says "NO" It is obvious to all of us that Adobe Premiere Pro will never give DVD a hug, and it isn't rare to see that many people are really confused when they want to import their DVDs to Adobe Premiere Pro for editing. What to do? Yes, you may have noticed that, there is only a way out, that is ripping your DVDs to some formats workable with Adobe Premiere Pro natively, and this is what DVD to Adobe Premiere Pro can do. Importing DVD to Adobe Premiere Pro on Mac DVD to Adobe Premiere Pro converter for Mac is the specially designed application for ripping/converting DVD movies, DVD VOB files or DVD clips to Adobe Premiere Pro compatible AVI, MOV, MPG files with either DVD ripping tool and video converting tool within the versatile DVD to Adobe Premiere Pro converter who is a powerful program for dealing with DVD and videos perfectly. Mac DVD to Adobe Premiere Pro converter can work with a wide variety of files including DVD, VOB, AVI, WMV, MPG, MOV, MP4, DV, FLV, MKV, ASF, SWF, HD video for using with other editing tools like iMovie, FCP etc, play on QuickTime, iTunes, put on portable devices like iPod, iPhone, iPad, iRiver, BlackBerry, Gphone, Mobile Phone or upload to webistes such as YouTube, MySpace. DVD to Adobe Premiere Pro converter for Mac can also help you do some basic editing. You can trim, crop your DVD movie or DVD clip, apply special effect to make it more artistic, merge several DVD clips to a single one or tweak the output parameters for video and audio separately to get a better quality rendering. Besides, to get a good common of the process the preview widnows is also available for you.

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• Don't know why this small shell script wont work

  - by tominated

  Hi, I'm trying to make a small script to start up gunicorn for a python website I'm making. I have modified the script found at https://github.com/benoitc/gunicorn/blob/master/examples/gunicorn_rc slightly. Here's my version. #!/bin/sh GUNICORN=/usr/local/bin/gunicorn ROOT=/srv/mobile-site/app PID=/var/run/gunicorn.pid APP=mobilecms:app if [ -f $PID ]; then rm $PID fi cd $ROOT exec $GUNICORN -b 127.0.0.1:8080 -w 8 -k gevent --pidfile=$PID $APP When I try to run the script though, it shows this error /etc/init.d/gunicorn: 13: Syntax error: end of file unexpected (expecting "fi") Does anyone know what's wrong?

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• redirection problem for my sites.

  - by redirect-p

  I have a site example.com and another one test.example.com. Both have different configuration file. But when I enter url test.example.com it will redirect to example.com. configuration file for example.com <VirtualHost *:80> ServerName example.com ServerAlias www.example.com DirectoryIndex index.html DocumentRoot my-document-path Options -Indexes ErrorDocument 404 /errors/404.html ErrorDocument 403 /errors/404.html <Location "/"> SetHandler python-program PythonHandler django.core.handlers.modpython PythonPath "['path', 'path'] + sys.path" SetEnv DJANGO_SETTINGS_MODULE example.settings PythonInterpreter example PythonAutoReload On PythonDebug On </Location> </VirtualHost>

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• How do I calculate the amount of tuning needed for my server ?

  - by Low Kian Seong

  I have a server which is running a few discrete Python, Java application which most of the time imports data into a PostGreSQL database. I would like to know from people out there who have experience tuning enterprise grade servers how do i go about calculating in a holistic way the amount of tuning needed for my server for example vm.swappiness, vm.overcommit_ratio and other numerical tunings needed for my server. I tried to enable sar on my server to capture daily numbers but these are more along the lines of total numbers and I can't figure out how to allocate memory for my applications. Help would be appreciated. Thanks.

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• mod_fcgid process doesn't respawn

  - by aaronsw

  I have a Python script running on my server as a FastCGI using Apache2 and mod_fcgid. I let it spawn up to five processes. But I soon get messages like these in the Apache logs: [Wed Sep 02 23:16:34 2009] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function [Wed Sep 02 23:16:35 2009] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function and then Apache doesn't seem to recognize that all its processes are dead (I have a max of 5 backends) and refuses to spawn new ones: [Wed Sep 02 23:26:16 2009] [notice] mod_fcgid: /var/www/hacks.og.theinfo.org/picker.fcgi total process count 5 >= 5, skip the spawn request [Wed Sep 02 23:26:17 2009] [notice] mod_fcgid: /var/www/hacks.og.theinfo.org/picker.fcgi total process count 5 >= 5, skip the spawn request at which point it refuses to respond to requests from the outside world. This doesn't seem to happen with my other FastCGIs, which all use the same Apache config: <IfModule mod_fcgid.c> AddHandler fcgid-script .fcgi IPCConnectTimeout 20 MaxProcessCount 5 DefaultMaxClassProcessCount 2 DefaultMinClassProcessCount 1 </IfModule> Any idea what causes it?

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• How to create tunnel to utilize for telnet connection.

  - by Z12

  The scenario is as follows: Machine A is located behind client firewall. The machine runs telnetd. This is Linux machine with Python 2.5.4 installed. I do not know the IP addy of the router and firewall is not open incoming. outgoing firewall is open. Machine B (Windows machine) is a server with well known IP address. I can install any programs I want on either machine. The idea is that I want Machine A to open a socket to machine B. Then I want to hold that socket and use to run a telnet session from Machine B to Machine A telnetd server. Is there any freeware that does this? Thoughts? Thanks!

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• nginx terminates connection after 65k bytes

  - by David Wolever

  I've got nginx configured as a front-end to a Python application running under gunicorn, but nginx is terminating connections after about 65k of data have been sent. For example, I've got a view which looks like this: def debug_big_file(request): return HttpResponse("x" * 500000) But when I access that URL through nginx, I only get 65283 bytes: $ curl https://example.com/debug/big-file | wc … curl: (18) transfer closed with outstanding read data remaining 0 1 65283 Note that everything works as expected when accessing gunicorn directly: $ curl http://localhost:1234/debug/big-file | wc … 0 1 500000 The relevant nginx config: location / { proxy_pass http://localhost:1234/; proxy_redirect off; proxy_headers_hash_bucket_size 96; } And nginx version 1.7.0 Some other facts: The number of bytes is consistent from request to request, but it varies based on the content (I first noticed it with a large PNG file, which was cut off after 65,372 bytes, not 65,283) 110k bytes are sent correctly (ie, "x" * 110000 returns all 110,000 bytes), but 120k bytes are not tcpdump suggests that nginx is sending a RST packet to gunicorn:

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• Way to access Palm Zlib DB files (.pdb) on Windows or Debian

  - by Italy Kafe

  Is anyone aware of a way to access the data in zlib database files for Palm? The file extension is .pdb, but that extension covers a whole range of formats, so a generic 'pdb viewer' won't necessarily be able to handle this. I'd like to be able to open pdb zlib database files. I'd be grateful for any access method: an app for Windows or Debian, or a library for Python or PHP that makes it possible to access the data in these files. If no such tool exists, does anyone know how to use zlib to decompress the data from such a Palm pdb database?

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• Problems with kickstart script, partition info crashes deployment

  - by tore-

  Hi, Currently testing cobbler, but have problem with the kickstart script when the partition information is loaded. Here is my ks: http://pastebin.ca/1824343 I can't figure out what is the problem with the partsection at all. Without it, it works. I've even tried autopart. If the entry is removed, it works, but of course I have to provide the installer with partition information. Under the kickstart an python exception is raised. I get a Errno 2 No such file or directory. My Apache logs states: File does not exist: /var/www/cobbler/links/CentOS-5.3-x86_64/images/updates.img File does not exist: /var/www/cobbler/links/CentOS-5.3-x86_64/disc1 File does not exist: /var/www/cobbler/links/CentOS-5.3-x86_64/images/product.img But without the part information, no error occours. What am I not seeing? Cobbler 2.0.3, imported the CentOS 5.3 x86_64 DVD, PXE booting from a Xen guest.

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