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  • C++ Without Source Files

    - by Snowman
    Bjarne Stroustrup mentions in his book "The C++ Programming Language, 4th Edition" that not all C++ implementations use files to store and compile code: There are systems that do not store, compile, and present C++ programs to the programmer as sets of files. (Chapter 15, page 419) Later in the chapter, he reiterates that certain implementations do not use files but he does not give any examples. How would such an environment function compared to a more common file-based environment?

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  • Good book about advanced programming techniques [closed]

    - by Luca
    I am looking to a book covering adavnced programming techniques, covering different practical scenarios and describing the different challanges with the relative solutions. As example, which are the best ways to implement a module for buying on a web application with credit card or how to manage responsivenes for the frontend of the web application itself (dealing with cache, optimeze plugins, etc). On the web there are tons of tutorials about these topics, but I am looking for a book where such cases are collected all together and treated by real professionists. If the book would provide some code samples, that would be a plus (especially if C# .NET), but I am more interested in the approach/solution rather than the code details. I could not find any of these cases in the general book about programming, therefore I hope someone might point me in the right direction. EDIT: I have 4 years experience as web developer, mainly with Microsoft (C#, ASP.NET, SQL Server) and client side technologies (jQuery, HTML/CSS).

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  • Common Network Administrator Tools

    - by No Time
    I would like to make a custom clump of Network Admin packages, to be able to carry on a thumb drive, to administer Debian based machines. Examples of what I would include so far: nmap traceroute vnstat zenmap * I know every situation may be different, but I would like to build a toolbox I could bring everywhere, and am looking for advice on other tools which would work. (If there is a similar question, I am fine being directed there)

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  • Is there a canonical book on parallel programming with focus on C++ ?

    - by quant_dev
    I am looking for a good book about parallel programming with focus on C++. Something suitable for a person reasonably good in C++ programming, but with no experience in concurrent software development. On the other hand, I'd prefer a practical book, without loads of silly examples about philosophers eating lunch. Is there a book out there that's the de-facto standard for describing best practices, design methodologies, and other helpful information on parallel programming with focus on C++ ? What about that book makes it special?

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  • when the page scroll to certain point, how to make a second fixed header appear

    - by MikeSm
    I have a page that will be responsive and I also want to add a header that appears once the visitor scrolls for a bit. The header will supplant the main header in order to be visible as the user travels down the page. I think this was a convention that people have used, and I need some help, as i can't really code it from scratch. Has anyone seen examples or tutorials on this. I've looked but can't come up with it.

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  • why my unit testing taken more than normal time to run in VS 2010 Premium [on hold]

    - by kombo
    I have only 4 proeject in my solutions. Am trying to run a unit test for one of my class in one of the project. I Create the unit test by: Right clicking on the class choose the create unit test option. I followed the wizard to the end.which resulting the test creation. I just pass the values of the parameter and run the test. but my test keep running. Both surprisingly it runs on other developers pc. NB:My class is connecting to the database and my application is asp.net web form. i know this is not recommended but i want to have my test running now. i have tried alot of samples on the internet but still my problem persist. Could any one tell me the cause of the extreme slowness(more than 30 minutes)

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  • ??????WLST

    - by Masa Sasaki
    WebLogic Server?????????????WebLogic Server????????7?23?????????38?WebLogic Server???@??????????????WLST?(?????? ??????????? ?? ??)??????????????WLST(WebLogic Scripting Tool)?WebLogic Server???????????????????????????????????WLST?????TIPS??????????????????????WLST????????????????????????????????????????????·????????????(?????? Fusion Middleware?????? ??? ??) WLST?? WebLogic Scripting Tool???WebLogic ??????????????????????????·?????????? WebLogic Server 9.x???????????????????Java??????·?????????Jython??????????? WLST???????????????????????????Jython??????WebLogic Server??????????????(????)????????WLST?Jython??????????????????????????? WLST???????? WLST?????????????????????????WebLogic????????????????????????????????·????????????????·??????(???????????)???????? (WLST????????????????????????????????????????????) WLST??????Java Management Extensions (JMX)???????????????JMX??????????????????????????????????Bean (MBean)??????????????????????? WLST???????? WLST??????WebLogic Server?????????????????·??????????????????????????????????????????????????????????????????????????????????????????????????????????WLST??????WebLogic Server??????????JMX????????????????????????????????WebLogic???????????????WLST????????????????????? ???????????·???????????? ????? ???????????·???·??????WLST?????????????????????????????????????????????????????????????????????????????????????????????????????WLST??????????????????????????????????????????? ?????·??? ???.py????????·????(?????filename.py)?WLST?????????????????????????????WLST???????????????????????????·?????Jython??????????????????????? ?????? ?????????Java?????WLST??????????????????????WLST????????????????????????????????·????????WLST???????????????????????????? WLST?MBean WebLogic Server?????(?????????)?JMX(Java Management Extension)?????????????JMX???????????????Bean(MBean)?????? MBean?????? MBean????????????????????????????????MBean???????????????????????????????????????????????????????????????????? WLST????????? ? ?????? ? ???????????(MBean???)??? ? ?????????? - ??????? - ?????????? - ?? - ?????? WLST???? ??·??·?????WLST???????????????????????????????????????????WLST??????????????? TIPS?MBean???? TIPS?????????????????WLST????????????????????????????????????????????(SSL)?????????????????????????????????SSL??????????????????????????????????????????????MBean????????WLST ls?????WLST find?????JRockit Mission Control?config.xml???????????????????WebLogic Server MBean Reference????????????????? ??? WLST??????????????????????????????????????????????????????????????????ThreadPoolRuntimeMBean??????JMS?????????WLST??????????????? ??????????????????????????? WLST ????????? $WL_HOME/samples/server/examples/src/examples/wlst/online WLST????????????? $WL_HOME/common/templates/scripts/wlst ???????????????????????????????????????????????????????????????????WLST???????????????????·??????????WLST????????????????????? ?????? WebLogic Server??? WebLogic Server?????????WebLogic Server?????! WebLogic Server??????(???????????) WebLogic Server???????? WebLogic Server??????

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  • AWStats is processing log files but does not display them

    - by Wouter
    I've setup AWStats on my VPS to get some more insight into the traffic coming to my site. As instructed I ran a manual build/update which ran fine: sudo -u www-data ./awstats.pl -config=xxxx.com Create/Update database for config "/etc/awstats/awstats.xxxx.com.conf" by AWStats version 6.9 (build 1.925) From data in log file "/usr/share/doc/awstats/examples/logresolvemerge.pl /var/www/xxxx.com/logs/*-access.log |"... Phase 1 : First bypass old records, searching new record... Searching new records from beginning of log file... Phase 2 : Now process new records (Flush history on disk after 20000 hosts)... Warning: awstats has detected that some hosts names were already resolved in your logfile /usr/share/doc/awstats/examples/logresolvemerge.pl /var/www/xxxx.com/logs/*-access.log |. If DNS lookup was already made by the logger (web server), you should change your setup DNSLookup=1 into DNSLookup=0 to increase awstats speed. Jumped lines in file: 0 Parsed lines in file: 814 Found 0 dropped records, Found 0 corrupted records, Found 0 old records, Found 814 new qualified records. It also produced the file in the DatDir: /var/lib/awstats/awstats052010.xxxx.com.txt which contains what I would expect. BUT when I visit: xxxx.com/awstats/awstats.pl it tells me Last Update: Never updated (See 'Build/Update' on awstats_setup.html page) and the rest of the page is blank. I'm pretty sure I set it up correctly but now I cannot figure out why this is happening. Hopefully someone smarter then me can help me. Thank you in advanced.

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  • Debian Apache2 and SSL

    - by Topher Fangio
    Hello all, I recently took over a server that is using Apache2 with SSL. I have setup a new server to which I am migrating all of the old websites so that we can more easily scale (it's a cloud server) and so that I can set everything up correctly (or at least with some sort of convention). I have read quite a few articles on setting up Apache2 and SSL with virtual hosts, but I'm a bit confused because all of the examples show three files and I only seem to have two. To compound the problem, they are all named differently (do the file extensions actually make a difference?). The examples show something to this effect: <VirtualHost X.X.X.X:443> ServerAlias something.mydomain.com ServerAdmin [email protected] DocumentRoot /var/www/project/client/site SSLEngine on SSLCertificateFile /etc/ssl/certs/mydomain-cert.pem SSLCertificateKeyFile /etc/ssl/private/mydomain-key.pem SSLCertificateChainFile /etc/ssl/certs/mydomain-ca.crt </VirtualHost> However, the files I have are: _.mydomain.com.crt gd_bundle.crt It is a wildcard certificate that we purchased through GoDaddy I believe. I believe that the first file is the actual certificate file and the gd_bundle.crt is the chain file, but that leaves me without a key file. There is also a random mydomain.csr file lying around on the old server, but it wasn't one of the files bundled with the download from GoDaddy, so I'm not really sure as to what it is. Any help in figuring out what I need to do would be greatly appreciated. I am software developer, so I know my way around computers, but I have only dabbled in server setup/maintenance. Much Thanks!

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  • Ionic Isapi Rewrite error on IIS6, Windows 2003 Server

    - by EsiX
    First of all my setup is a VPS running Windows 2003 Server with multiple domains on it IIS 6, Plesk IsapiRewrite4.ini RewriteLogLevel 3 RewriteCond %{HTTP_HOST} ^mydomain.com$ RewriteRule ^/(.*)$ http://www.mydomain.com/$1 [R] This is one of their basic examples. Ionic is installed and setup proper because if I use another rule (a simpler one ... like the one following) it works instant # IsapiRewrite4.ini # RewriteLogLevel 3 # # This ini file illustrates the use of a redirect rule. # Any incoming URL that starts with an uppercase W # will be redirected to the specified server. RewriteRule ^/(W.*)$ http://server.dyndns.org:7070/$1 [R] This one works in the TestDriver tool and none of them gives any error or warnings in TestParse tool, but it doesn't do a thing on the webserver... The fact that one rule works means that the isapi module works. I am using the last version. RedirectRule http://mydomain.com/someplace/somefile.html http://www.mydomain.com/howto/someplace/anotherfile.html [I,L] Both examples were taken from http://iirf.codeplex.com/Wiki/View.aspx?title=Redirection&referringTitle=Home So my IsapiRewrite4.ini needs to do this two tasks: auto transform and redirection for a number of urls. Can you help out.. I really don't know what I'm doing wrong.

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  • So Close: How to get this SSH login working (.bashrc)

    - by This_Is_Fun
    Objective: SSH login ( + eliminate warning message) / run 2 commands / stay logged in: EDIT: Oops, I made a mistake (see below): This code does ~95% of what I wanted to do # .bashrc # Run two commands and stay logged in to new server. alias gr='ssh -t -p 5xx4x [email protected] 2> /dev/null "cd /var; ls; /bin/bash -i"' Now, after successful login / verify user logged in = root pts/0 2011-01-30 22:09 Try to 'logout' = bash: logout: not login shell: use `exit' I seem to have full root access w/o being logged into the shell? (The " /bin/bash -i " was added to 'Stay logged in' but doesn't work quite as expected) FYI: The question is "How to get this SSH login working" & it is mostly solved, sorry I made a mess... ... .. . Original Question Here: # .bashrc # Run two commands and stay logged in to new server. alias gr='ssh -t -p 5xx4x [email protected] "cd /var; ls; /bin/bash -i"' # (hack) Hide "map back to the address - POSSIBLE BREAK-IN ATTEMPT!" message. alias gr='ssh -p 5xx4x [email protected] 2> /dev/null' Both examples 'work' as shown; When I try to add the ' 2 /dev/null ' to the first example, then the whole thing breaks. I'm out of time trying to solve the warning message other ways, so is it possible to combine both examples to make example #1 work w/o the warning message? Thank you. ps. If you also know a proper way to kill the login warning message, please do tell (the 'standard' "edit host file" advice isn't working for me)

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  • mrepo and grouplist/groupinstall?, mrepo not working as expected with group

    - by user52874
    All, I'm trying to set up mrepo so we can have internal repositories. After quite the slog, things seem to be working as expected EXCEPT for groups. From man createrepo: EXAMPLES Here is an example of a repository with a groups file. Note that the groups file should be in the same directory as the rpm packages (i.e. /path/to/rpms/comps.xml). createrepo -g comps.xml /path/to/rpms So here's what I'm doing: wget -c http://ftp.scientificlinux.org/linux/scientific/6/x86_64/os/repodata/comps-sl6-x86_64.xml cp comps-sl6-x86_64.xml /var/mrepo/SL6-x86_64/os/Packages/comps-sl6-x86_64.xml createrepo -g comps-sl6-x86_64.xml /var/mrepo/SL6-x86_64/os/Packages/ lots of output, no apparent errors or warnings BUT.. from a client: yum grouplist Loaded plugins: refresh-packagekit Setting up Group Process Error: No group data available for configured repositories Here's /etc/mrepo.conf: ### Configuration file for mrepo ### The [main] section allows to override mrepo's default settings ### The mrepo-example.conf gives an overview of all the possible settings [main] srcdir = /var/mrepo wwwdir = /var/www/mrepo confdir = /etc/mrepo.conf.d arch = x86_64 mailto = root@localhost smtp-server = localhost pxelinux = /usr/lib/syslinux/pxelinux.0 tftpdir = /tftpboot #rhnlogin = username:password ### Any other section is considered a definition for a distribution ### You can put distribution sections in /etc/mrepo.conf.d ### Examples can be found in the documentation. Here's /etc/mrepo.conf.d/sl6.mrepo: ### Scientific Linux 6 [SL6] name = Scientific Linux 6 release = 6 arch = x86_64 metadata = repomd repoview os = rsync://rsync.scientificlinux.org/scientific/$release/$arch/os/ updates = rsync://rsync.scientificlinux.org/scientific/$release/$arch/updates/ security = rsync://rsync.scientificlinux.org/scientific/$release/$arch/updates/security/ fastbugs = rsync://rsync.scientificlinux.org/scientific/$release/$arch/updates/fastbugs/

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  • Problems using Mesa demos

    - by Rodnower
    Hello, I successfully installed Mesa with "yum install Mesa*" and downloaded MesaDemos-7.8.tar.gz archive. Now I try follow instructions from "Mesa3d.org - Download / Insall - Compiling and Installing - 1.5 Running the demos", but in progs/demos there is only *.c files, when I try to compile them, I get many similar errors like: gears.c:(.text+0x54): undefined reference to `glShadeModel' I guess that this is very noob question, and I understand that there is very simple solution, but I haven't any idea... In beggining of the file there are all necessary #includes: #include <math.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <GL/glut.h> So I have some questions: Is there some Mesa forum on the web? Is there some compiled demos? Is there some site with well described examples of Mesa using? What I need for compile those examples? I have CentOS 5 Thank you for ahead.

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  • Tomcat uninstall problems

    - by Deepak
    Hi, I am using "apt-get remove tomcat6" to remove tomcat.It gives this outout and tomcat still running on my system: Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: seamonkey-gnome-support ocaml-base-nox libghc6-hsql-prof libgmp3-dev libffi-dev libtool libghc6-hsql-dev libgmpxx4ldbl ghc6-prof camlp4 ghc6 ledit ocaml-interp rhino libltdl-dev ocaml-nox Use 'apt-get autoremove' to remove them. The following packages will be REMOVED: tomcat6 tomcat6-admin tomcat6-examples 0 upgraded, 0 newly installed, 3 to remove and 1 not upgraded. After this operation, 2,400kB disk space will be freed. Do you want to continue [Y/n]? y Segmentation fault deepak@kalpna-desktop:~$ apt-get remove tomcat6 Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: seamonkey-gnome-support ocaml-base-nox libghc6-hsql-prof libgmp3-dev libffi-dev libtool libghc6-hsql-dev libgmpxx4ldbl ghc6-prof camlp4 ghc6 ledit ocaml-interp rhino libltdl-dev ocaml-nox Use 'apt-get autoremove' to remove them. The following packages will be REMOVED: tomcat6 tomcat6-admin tomcat6-examples 0 upgraded, 0 newly installed, 3 to remove and 1 not upgraded. After this operation, 2,400kB disk space will be freed. Do you want to continue [Y/n]? y Segmentation fault What is the way to re-install tomcat on ubuntu. Regards D

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  • only port working with mod_proxy is 8009, trying to use with tomcat and httpd, dont know why

    - by techsjs2012
    I am trying to use mod_proxy with httpd and tomcat. If I leave tomcat ajp to run on 8009 in the server.xml of tomcat and in the httpd.conf of apache httpd everything works great but once I change it to anything else and restart them both it does not work.. I trieded 8109,8209 and 8019.. only thing that works is 8009? Below is my setup that works. <Proxy balancer://testcluster stickysession=JSESSIONID> BalancerMember ajp://127.0.0.1:8009 min=10 max=100 route=node2 loadfactor=1 </Proxy> ProxyPass /examples balancer://testcluster/examples <Location /balancer-manager> SetHandler balancer-manager AuthType Basic AuthName "Balancer Manager" AuthUserFile "/etc/httpd/conf/.htpasswd" Require valid-user </Location> if I change the port to anything in here and the server.xml of tomcat it does not work but I can telnet the port so I know its up? below are the other libs settings I have LoadModule auth_basic_module modules/mod_auth_basic.so LoadModule auth_digest_module modules/mod_auth_digest.so LoadModule authn_file_module modules/mod_authn_file.so LoadModule authn_alias_module modules/mod_authn_alias.so LoadModule authn_anon_module modules/mod_authn_anon.so LoadModule authn_dbm_module modules/mod_authn_dbm.so LoadModule authn_default_module modules/mod_authn_default.so LoadModule authz_host_module modules/mod_authz_host.so LoadModule authz_user_module modules/mod_authz_user.so LoadModule authz_owner_module modules/mod_authz_owner.so LoadModule authz_groupfile_module modules/mod_authz_groupfile.so LoadModule authz_dbm_module modules/mod_authz_dbm.so LoadModule authz_default_module modules/mod_authz_default.so LoadModule ldap_module modules/mod_ldap.so LoadModule authnz_ldap_module modules/mod_authnz_ldap.so LoadModule include_module modules/mod_include.so LoadModule log_config_module modules/mod_log_config.so LoadModule logio_module modules/mod_logio.so LoadModule env_module modules/mod_env.so LoadModule ext_filter_module modules/mod_ext_filter.so LoadModule mime_magic_module modules/mod_mime_magic.so LoadModule expires_module modules/mod_expires.so LoadModule deflate_module modules/mod_deflate.so LoadModule headers_module modules/mod_headers.so LoadModule usertrack_module modules/mod_usertrack.so LoadModule setenvif_module modules/mod_setenvif.so LoadModule mime_module modules/mod_mime.so LoadModule dav_module modules/mod_dav.so LoadModule status_module modules/mod_status.so LoadModule autoindex_module modules/mod_autoindex.so LoadModule info_module modules/mod_info.so LoadModule dav_fs_module modules/mod_dav_fs.so LoadModule vhost_alias_module modules/mod_vhost_alias.so LoadModule negotiation_module modules/mod_negotiation.so LoadModule dir_module modules/mod_dir.so LoadModule actions_module modules/mod_actions.so LoadModule speling_module modules/mod_speling.so LoadModule userdir_module modules/mod_userdir.so LoadModule alias_module modules/mod_alias.so LoadModule substitute_module modules/mod_substitute.so LoadModule rewrite_module modules/mod_rewrite.so LoadModule proxy_module modules/mod_proxy.so LoadModule proxy_balancer_module modules/mod_proxy_balancer.so LoadModule proxy_ajp_module modules/mod_proxy_ajp.so #LoadModule proxy_ftp_module modules/mod_proxy_ftp.so #LoadModule proxy_http_module modules/mod_proxy_http.so #LoadModule proxy_connect_module modules/mod_proxy_connect.so LoadModule cache_module modules/mod_cache.so LoadModule suexec_module modules/mod_suexec.so LoadModule disk_cache_module modules/mod_disk_cache.so LoadModule cgi_module modules/mod_cgi.so LoadModule version_module modules/mod_version.so

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  • Rewriting html links with modproxyperlhtml

    - by Juancho
    I'm trying to setup an Apache reverse proxy using mod_proxy and modproxyperlhtml. This is my scenario: Domain for the proxy: http : // www.myserver.com/ Destination server (the one behind the proxy): http : // myserver.foo.com/myapp/ I'm sorry that I have to space the URL but serverfault doesn't allow me to post more than two links as "spam protection mechanism" (ridiculous on a site where you ask questions about servers and it's really probable to post more than two times the same URL's to explain your question). The idea is to map http : // www.myserver.com/ to http : // myserver.foo.com/myapp/ . Note that the path on the proxy is / and on the destination server is /myapp/. All of the examples I can find on the net (like the one on the official documentation of modproxyperlhtml) are the other way around, ie. path on the proxy /myapp/ and path on the destination server /. This is my current config that doesn't work: ProxyPass / http : // myserver.foo.com/myapp/ ProxyPassReverse / http : // myserver.foo.com/myapp/ PerlInputFilterHandler Apache2::ModProxyPerlHtml PerlOutputFilterHandler Apache2::ModProxyPerlHtml SetHandler perl-script PerlSetVar ProxyHTMLVerbose "On" LogLevel Info <Location / > # ProxyPassReverse /myapp/ PerlAddVar ProxyHTMLURLMap "/myapp/ /" PerlAddVar ProxyHTMLURLMap "http : // myserver.foo.com /" </Location> The examples use the ProxyPassReverse inside the Location directive, but on my case doesn't work, only when outside. With this configuration the links aren't being replaced as they should be, my guess is that the location isn't being found, thus the rewrite rules aren't being applied. The error log only shows that it uncompresses the content, searches it but doesn't find anything: [Tue Nov 13 0842:05 2012] [warn] [ModProxyPerlHtml] Uncompressing text/html; charset=UTF-8, Content-Encoding: gzip\n [Tue Nov 13 08:42:05 2012] [warn] [ModProxyPerlHtml] Content-type 'text/html; charset=UTF-8' match: /(text\\/javascript|text\\/html|text\\/css|text\\/xml|application\\/.*javascript|application\\/.*xml)/is\n [Tue Nov 13 08:42:05 2012] [warn] [ModProxyPerlHtml] Compressing output as Content-Encoding: gzip\n [Tue Nov 13 08:42:06 2012] [warn] [ModProxyPerlHtml] Content-type 'text/html; charset=UTF-8' match: /(text\\/javascript|text\\/html|text\\/css|text\\/xml|application\\/.*javascript|application\\/.*xml)/is\n What could be wrong ?

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  • Shell wrong encoding

    - by csch
    Somehow I managed to screw up my shell-encoding. An example: root§server:ç£ cat --help Usage: cat ¡OPTION¿... ¡FILE¿... Concatenate FILE(s), or standard input, to standard output. -A, --show-all equivalent to -vET -b, --number-nonblank number nonempty output lines -e equivalent to -vE -E, --show-ends display $ at end of each line -n, --number number all output lines -s, --squeeze-blank suppress repeated empty output lines -t equivalent to -vT -T, --show-tabs display TAB characters as ^I -u (ignored) -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. Examples: cat f - g Output f's contents, then standard input, then g's contents. cat Copy standard input to standard output. Report cat bugs to bug-coreutils§gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> For complete documentation, run: info coreutils 'cat invocation' root§server:ç£ It should look like: root@server:~# cat --help Usage: cat [OPTION]... [FILE]... Concatenate FILE(s), or standard input, to standard output. -A, --show-all equivalent to -vET -b, --number-nonblank number nonempty output lines -e equivalent to -vE -E, --show-ends display $ at end of each line -n, --number number all output lines -s, --squeeze-blank suppress repeated empty output lines -t equivalent to -vT -T, --show-tabs display TAB characters as ^I -u (ignored) -v, --show-nonprinting use ^ and M- notation, except for LFD and TAB --help display this help and exit --version output version information and exit With no FILE, or when FILE is -, read standard input. Examples: cat f - g Output f's contents, then standard input, then g's contents. cat Copy standard input to standard output. Report cat bugs to [email protected] GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> For complete documentation, run: info coreutils 'cat invocation' root@server:~# I have no clue what went wrong, do you have any ideas?

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  • What steps should I take to secure Tomcat 6.x?

    - by PAS
    I am in the process of setting up an new Tomcat deployment, and want it to be as secure as possible. I have created a 'jakarta' user and have jsvc running Tomcat as a daemon. Any tips on directory permissions and such to limit access to Tomcat's files? I know I will need to remove the default webapps - docs, examples, etc... are there any best practices I should be using here? What about all the config XML files? Any tips there? Is it worth enabling the Security manager so that webapps run in a sandbox? Has anyone had experience setting this up? I have seen examples of people running two instances of Tomcat behind Apache. It seems this can be done using mod_jk or with mod_proxy... any pros/cons of either? Is it worth the trouble? In case it matters, the OS is Debian lenny. I am not using apt-get because lenny only offers tomcat 5.5 and we require 6.x. Thanks!

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  • Programmatically Insert Page Break in Active Report

    - by Kevin Babcock
    I've been scouring the web for a good example, but cannot figure out how to add a page break to an Active Reports report programmatically. The reports I'm working with usually require 1-2 pages for each record. In order to support dual-sided printing of the reports I want to insert a blank page for each record that uses an odd number of pages, ensuring that each new record is printed on the front of each printed page. I'm very new to Active Reports, so any suggestions, code samples, or links are much appreciated!

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  • C# ThreadPool QueueUserWorkItem Synchronization

    - by ikurtz
    Greetings, I am employing ThreadPool.QueueUserWorkItem to play some sound files and not hanging up the GUI while doing so. It is working but has an undesirable side effect. While the QueueUserWorkItem CallBack Proc is being executed there is nothing to stop it from starting a new thread. This causes the samples in the threads to overlap. How can I make it so that it waits for the already running thread to finish running and only then run the next request? Thanks in advance :)

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  • Runge-Kutta (RK4) integration for game physics

    - by Kai
    Gaffer on Games has a great article about using RK4 integration for better game physics. The implementation is straightforward but the math behind it confuses me. I understand derivatives and integrals on a conceptual level but I haven't manipulated equations in a long time. Here's the brunt of Gaffer's implementation: void integrate(State &state, float t, float dt) { Derivative a = evaluate(state, t, 0.0f, Derivative()); Derivative b = evaluate(state, t+dt*0.5f, dt*0.5f, a); Derivative c = evaluate(state, t+dt*0.5f, dt*0.5f, b); Derivative d = evaluate(state, t+dt, dt, c); const float dxdt = 1.0f/6.0f * (a.dx + 2.0f*(b.dx + c.dx) + d.dx); const float dvdt = 1.0f/6.0f * (a.dv + 2.0f*(b.dv + c.dv) + d.dv) state.x = state.x + dxdt * dt; state.v = state.v + dvdt * dt; } Can anybody explain in simple terms how RK4 works? Specifically, why are we averaging the derivatives at 0.0f, 0.5f, 0.5f, and 1.0f? How is averaging derivatives up to the 4th order different from doing a simple euler integration with a smaller timestep? After reading the accepted answer below, and several other articles, I have a grasp on how RK4 works. To answer my own questions: Can anybody explain in simple terms how RK4 works? RK4 takes advantage of the fact that we can get a much better approximation of a function if we use its higher-order derivatives rather than just the first or second derivative. That's why the Taylor series converges much faster than Euler approximations. (take a look at the animation on the right side of that page) Specifically, why are we averaging the derivatives at 0.0f, 0.5f, 0.5f, and 1.0f? The Runge-Kutta method is an approximation of a function that samples derivatives of several points within a timestep, unlike the Taylor series which only samples derivatives of a single point. After sampling these derivatives we need to know how to weigh each sample to get the closest approximation possible. An easy way to do this is to pick constants that coincide with the Taylor series, which is how the constants of a Runge-Kutta equation are determined. This article made it clearer for me: http://web.mit.edu/10.001/Web/Course%5FNotes/Differential%5FEquations%5FNotes/node5.html. Notice how (15) is the Taylor series expansion while (17) is the Runge-Kutta derivation. How is averaging derivatives up to the 4th order different from doing a simple euler integration with a smaller timestep? Mathematically it converges much faster than doing many Euler approximations. Of course, with enough Euler approximations we can gain equal accuracy to RK4, but the computational power needed doesn't justify using Euler.

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