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• Are we using IoC effectively?

  - by Juliet

  So my company uses Castle Windsor IoC container, but in a way that feels "off": All the data types are registered in code, not the config file. All data types are hard-coded to use one interface implementation. In fact, for nearly all given interfaces, there is and will only ever be one implementation. All registered data types have a default constructor, so Windsor doesn't instantiate an object graph for any registered types. The people who designed the system insist the IoC container makes the system better. We have 1200+ public classes, so its a big system, the kind where you'd expect to find a framework like Windsor. But I'm still skeptical. Is my company using IoC effectively? Is there an advantage to new'ing objects with Windsor than new'ing objects with the new keyword?

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• Performance implications of finalizers on JVM

  - by Alexey Romanov

  According to this post, in .Net, Finalizers are actually even worse than that. Besides that they run late (which is indeed a serious problem for many kinds of resources), they are also less powerful because they can only perform a subset of the operations allowed in a destructor (e.g., a finalizer cannot reliably use other objects, whereas a destructor can), and even when writing in that subset finalizers are extremely difficult to write correctly. And collecting finalizable objects is expensive: Each finalizable object, and the potentially huge graph of objects reachable from it, is promoted to the next GC generation, which makes it more expensive to collect by some large multiple. Does this also apply to JVMs in general and to HotSpot in particular?

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• Dediced server for all network functions?

  - by Alan

  I want to set up a fictional network configuration for a school in my neighborhood. They have about 50 computers altogether, 2X20 in computer rooms for students and another 10 scattered around for various professors. They should all access the internet through a dedicated Linux router machine. What they would like is to have domain names for those three computer groups. Lab1, Lab2 and Professors. The computers in Lab2 and Lab1 should have static ip and should all be named by numbers. So there should be 1@Lab1, 2@Lab1.... etc. And the Professors network should have a DHCP, with authentication. Is it an ok solution to have all these functions on a single server? (The one which will be used as a router) Do I have to set a local DNS for domain naming? Do the host names for Lab computers have to be set on the clients, or can they be automatically assigned?

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• uWSGI and python virtual env

  - by user27512

  I'm trying to use uWSGI with a virtual env in order to use the Trac bug tracker on it. I've installed system-wide uwsgi via pip. Next, I've installed trac in a virtualenv $ virtualenv venv $ . venv/bin/activate $ pip install trac I've then written a simple uWSGI configuration script: [uwsgi] master = true processes = 1 socket = localhost:3032 home = /srv/http/trac/venv/ no-site = true gid = www-data uid = www-data env = TRAC_ENV=/srv/http/trac/projects/my_project module = trac.web.main:dispatch_request But when I try to launch it, it fails: $ uwsgi --http :8000 --ini /etc/uwsgi/vassals-available/my_project.ini --gid www-data --uid www-data ... Set PythonHome to /srv/http/trac/venv/ ... *** Operational MODE: single process *** ImportError: No module named trac.web.main unable to load app 0 (mountpoint='') (callable not found or import error) I think uWSGI isn't using the virtual env. When inside the virtual env, I can import trac.web.main without having an ImportError. How can I do that ? Thanks

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• Recreating iPhone stock application with nested views

  - by john

  I am trying to create an app similar to the Yahoo Stocks app that comes on the iPhone, with the split-screen interface (table on the top, graph on the bottom). I'm struggling with the view hierarchy. What is the easiest way to implement a split-screen type of application. I basically want two views nested in a parent view. My problem is a little bit more complex because I want functionality like having a uipagecontrol (does this require another viewcontroller, or is simply implemented in the initial view controller)? To what degree do I need to use IB? I would prefer to do this all in Xcode. Thanks in advance!

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• Ubuntu on Oracle VirtualBox: Shared folders

  - by Rosarch

  I looked at this question, but it didn't help. I'm running Windows 7 as a host with Ubuntu 10.10 as a guest with VBox 4.0. I want to have a shared directory between the two. I have installed Guest Additions. I went to the VBox control panel in Windows, added a Shared Folder (sharename Shared_Folder), and chose "Auto Mount". A directory named "sf_Shared_Folder" appeared in /media on Ubuntu, but when I put files in that directory from an OS, I can't see them on the other one. I then tried to create a directory without automounting (sharename collectivefiles), and to run the following command: foo@foo-VirtualBox:~$ sudo mount -t vboxsf collectivefiles FileShare /sbin/mount.vboxsf: mounting failed with the error: No such device What is causing this error? I rebooted both the VM and VBox itself, but I'm still observing this.

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• Should I create subclass NSManagedObject or not?

  - by TP

  Hi, I have spent a few days learning and writing NSCoding and finally got it working. However, it took very long to archive and unarchive the (quite complex) object graph, which is unacceptable. After searching the internet for some time, I think the better way is to use core data. Do you recommend that 1) I should rewrite all my classes as subclasses of NSManagedObject or 2) should I create an instance variable of NSManagedObject in each of my class so that any changes to the class also updates its core data representation? Doing either way will need significant changes to the exiting classes and I think I have to update lots of unit test cases as well if it changes the way the classes are initialized. What do you recommend? I really don't want to head to the wrong approach again... Thanks!

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• Remote execution in Workgroup network

  - by ayyob khademi

  Consider this scenario: Please don't say that it would be better if I created a Domain network; Just consider this scenario. 10 PCs are all interconnected via a switch to a workgroup network named WORKGROUP; PCs specs(all are the same): Windows XP SP2 en (build:2600.xpsp_sp2_rtm.040803-2158) I have full physical control over my own PC (one of those 10 PCs) and what I know about the other ones: IPs of all 10 PCs. Administrator account name of all 10 PCs. Administrator account password of all 10 PCs. How can I execute an application on the other PCs???(without touching them) How can modify their registry settings???(without touching them)

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• Setting up WiFi extenders... is it possible to daisy-chain them?

  - by Bigbio2002

  At a location with limited cabling, I've had to set up WiFi signal extenders to cover the whole area. Here is a crude diagram... Internet - WiFi/Gateway - Extender 1 - Extender 2 | | PC (ethernet) WiFi device I was able to successfully daisy-chain three together, and I can access the internet from WiFi devices connected to the farthest extender. Is this a supported configuration? If not, what kind of issues can arise from it? The reason why I ask is that the PC keeps reporting IP address conflicts, and I'm wondering if that's caused because of the way this is configured. Additionally, I noticed that the extenders named their own SSID similar to the one they are connected to, but with a suffix. Would there be any issue in naming them all with the same SSID, to enable seamless roaming as you would with multiple standalone APs?

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• How to discard time intervals with Time Series / XYPlots using JFreeChart?

  - by Alex Arnon

  Hi All, I am building a set of chart displays, one of which is for a month display of daily trading - that is, one point of data per day (closing). Since there is no trade during weekends and holidays, I need to discard these data points. Not only that, but data points should still appear adjacent to each other, regardless of any gaps in time. This can be seen in any such chart e.g. in the 3 month graph for Nasdaq on Yahoo Finance - see how weekends are skipped. My question is: how should one correctly implement this in JFreeChart? Thanks in advance!

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• Forcing rsync to convert file names to lower case

  - by SvrGuy

  We are using rsync to transfer some (millions) files from a Windows (NTFS/CYGWIN) server to a Linux (RHEL) server. We would like to force all file and directory names on the linux box to be lower case. Is there a way to make rsync automagically convert all file and directory names to lower case? For example, lets say the source file system had a file named: /foo/BAR.gziP Rsync would create (on the destination system) /foo/bar.gzip Obviously, with NTFS being a case insensitive file system there can not be any conflicts... Failing the availability of an rsync option, is there an enhanced build or some other way to achieve this effect? Perhaps a mount option on CYGWIN? Perhaps a similar mount option on Linux? Its RHEL, in case that matters.

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• 8 Character Device names

  - by Lee Harrison

  Is there any reason to still use only 8 characters in a device name? My boss still uses this rule for printers, computers, routers, servers... basicly any device connected to our network. This leads to massive confusion among users, especially when it comes to printer. It also leads to confusion from an administration standpoint because every device is named vaguely, and similarly(its only 8 characters!). I understand the history behind this and compatibility with older systems, but none of our legacy systems will ever make use of PS-printers and Wifi networks. Is there any reason to still do this, and what is everyone else doing when it comes to naming network devices at an enterprise level?

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• FLOT: How to make different colored points in same data series, connected by a line?

  - by Mega Matt

  Hi all, I think I may have stumbled onto a limitation of Flot, but I'm not sure. I'm trying to represent a single data series over time. The items' "State" is represented on the Y-Axis (there are 5 of them), and time is on the X-Axis (items can change states over time). I want the graph to have points and lines connecting those points for each data series. In addition to tracking an item's State over time, I'd also like to represent it's "Status" at any of the particular points. This I would like to do by changing the color of the points. What this means is a single item may have different Statuses at different times, meaning for a single data series I need a line that connects different points (dots) of different colors. The only thing I've seen so far is the ability to specify the color for all points in a given dataseries. Does anyone know if there's a way to specify colors individually? Thanks.

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• Is there a Linux kernel boot parameter to configure an IPv6 address?

  - by aef

  I know there is a parameter named ip which lets you configure IPv4 addresses on the Linux kernel through the boot loader. That looks like the following: ip=192.0.2.1::192.0.2.62:255.255.255.192::eth0:none I'm looking for an equal parameter for IPv6 configuration. I couldn't find anything about this in the kernel documentations. Update: Because of a lot of you asked why I would need this: The idea to use a kernel configuration came up related to this problem. I suspect the regular boot-up interface configuration is not done, because the interfaces are already up. The reason for this could be that I'm using a pre-boot environment with a Dropbear SSH server to allow me to unlock my encrypted root partition. The IP addresses for this environment are configured through GRUB with the ip= parameter. There is no DHCP or Router Advertisement available on that Ethernet segment and as this is the uplink segment provided by a large hosting company, there is no way to change that fact.

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• Link to user directory displayed with wrong name in start menu

  - by wierob

  In the start menu the link to my user directory is displayed with a wrong name e.g. foo When I click on the link in the start menu the explorer opens my correct user directory but the addressbar still names it foo. However, when I open a cmd from that directory the location is correctly shown as C:\Users\myUserName. Furthermore there is no C:\Users\foo directory. How can I fix this (i.e. ths link in the startmenu should be named myUserName)?

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• Suddenly Facebook API stopped working on Windows Phone

  - by Juan Diego

  My code hasn't changed, it was working yesterday or so. I can oauth, get the token but then doing the following: WebClient wc = new WebClient(); wc.DownloadStringCompleted += result; wc.DownloadStringAsync(new Uri("https://graph.facebook.com/me&access_token=xxxTOKENxxx", UriKind.Absolute)); Returns a NotFound WebClient exception: "The remote server returned an error: NotFound." Strange thing is that when pasting that same url on Chrome or IE it does work(PC). Tried on Emulator and on 2 different real WP devices, even pasting the same url on the WP browser. Feels like facebook is rejecting Windows Phone for some reason? Anyone has an idea of what might be happening?

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• I cant browse php pages in my local server

  - by tibin mathew

  Hi, I cant browse php pages in my local server.Before it was working fine. But now i cant browse php pages, i can browse html pages and asp pages , no problems with that. But when i try to browse a php page its not loading. What will be the problem?? I am using windows 2000 advanced server and my web server is Tomcat please someone help me Guys i'm not getting anything in my browser, its just continue to loading Nothing showing in that page i'm not getting any 404 error or anything like that. its just continue to be loading for example consider my file is located under insider a folder named as myproject i can reach upto this http://localhost/projects/myproject but after that i cant browse php pages inside that... http://localhost/projects/myproject/index.php this will continue to be loading, and nothing shows in that page

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• Create a video stream from an image

  - by skerit

  I have a network camera that is only able to give me an image, not a video stream. In my home network this image is at http://192.168.1.16/loginfree.jpg I'm able to get this image a few times per second. I would now like to be able to serve it up as a video stream so I can use it in zoneminder. Any idea as to how I do that? I've messed around with named pipes and ffmpeg's image2pipe, but I can't get it to work properly.

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• MS Access Query Criteria Issue

  - by xxl3ww

  Currently I have a MS Access database query that has a field named FedEXDetTotal that totals 9 FedEX charge fields. I have another field that is from our inhouse system called "Total Charge". This is just a normal number field. I have created another Field in this query Diff: [FedEXDetTotal]-[Total Charge] This tells me the difference between the Fedex charge and what we actually charged. Everything works OK with this, but when I try to put the criteria 5 for the Diff field, when I run the query, I get a prompt saying "Enter Parameter Value FedEXDetTotal". Why is Access doing this? How do I get around this? I'm trying to start out with something simple(5), but what I really want is [Forms]![Dis].[txtbox_Diff].

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• overview/history of resident memory usage

  - by kapet

  I have a fairly complicated program (Python with SWIG'ed C++ code, long running server) that shows a constantly growing resident memory usage. I've been digging with the usual tools for the leak (valgrind, Pythons gc module, etc.) but to no avail so far. I'm a bit afraid that the actual problem is memory fragmentation within Python and/or libc managed memory. Anyway, my question is more specific right now: Is there a tool to visualize resident memory usage and ideally show how it develops over time? I think the raw data is in /proc/$PID/smaps but I was hoping there's some tool that shows me a nice graph of the amounts used by mmap'ed files vs. anonymous mmap'ed memory vs. heap over time so that it's easier to see (literally) what's changing. I couldn't find anything though. Does anybody know of a ready to use tool that graphs memory usage over space and time in an intuitive way?

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• [Rails] HTTP Get Request

  - by Karl

  I've been trying to get Rails to play with the new Facebook Graph API. After I get the authorization "code", I need to send another request which returns the access token in JSON form. It seems to work fine, however I want to fetch the access token JSON without redirecting the user. I'm attempting to use Net::HTTP.get, but I'm not sure how to use it to get a request body, or even if it's the right thing to use to begin with. Can anyone give an example of performing an HTTP GET?

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• How can I determine which dependency would cause a C++ compilation unit to be rebuilt?

  - by Seb Rose

  I have a legacy C++ application with a deep graph of #includes. Changes to any header file often cause recompiles of seemingly unrelated source files. The application is built using a Visual Studio 2005 solution (sln) file. Can MSBUILD be invoked in a way that it reports which dependency(ies) are causing a source file to be recompiled? Is there any other tool that might be able to help? NOTE: I'm only looking for a tool to tell me why a file would be rebuilt, not some restrospective magic telling me why it was rebuilt.

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• How to use chain.p7b with Apache?

  - by Debianuser

  I wanted to setup a SSL website on Apache and applied for a certificate from my local ISP. All they sent me was a single file named chain.p7b. I have always used certificates from other vendors without any issues but they usually provide two files to be configured as SSLCertificateFile and SSLCertificateChainFile in Apache. Following instructions from several online resources, I opened the p7b file in Windows and extracted 4 certificates from the file. I then tried configuring Apache with one of the files and it worked, but shows a warning: The certificate is not trusted because no issuer chain was provided. I though I have to use remaining 3 files as SSLCertificateChainFile and/or SSLCACertificateFile. I tried that but it didn't work so I am assuming it might be something completely different. Anyone faced this issue before? The following page http://www-01.ibm.com/support/docview.wss?uid=swg21458997 talks about using a keystore but is that relevant to Apache?

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• MATLAB: Need to make a 4D plot (3D + Colour/Color)

  - by user1305624

  I need to make a 3D surface where colour will represent the fourth variable. I know "surf" is SIMILAR to what I need, but that's not quite it. Basically, I have the following variables: t = [1:m] y = [1:n] a = [1:o] These should be the three Cartesian corodinate axes. I also have a variable S that is of dimensions m x n x o, and is basically the amplitude, a function of the previous three variables (i.e. S = f(t,y,a)). I want this to be represented by colour. So to summarize, I need a graph of the form (t,y,a,S), where the first three variables are vectors of unequal sizes and the final variable is a multidimensional array whose dimensions are determined by the first three. Thanks in advance.

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• Exploring other windows 8 machine's root

  - by moswald

  (Note, this is without a domain.) I used to be able to type start \\other_machine\c$ in PowerShell and explorer would pop up with a login dialog. Then I'd type other_machine\moswald and my password (the account is a local admin, of course) and I'm in. Now both machines have Windows 8 installed, and this no longer works (the dialog re-prompts with an "Access is denied" displayed). I've verified (through whoami) that the user is named other_machine\moswald, and I'm positive I'm typing the correct password. So what gives? (edited to include specific result)

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