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• HAProxy and 2 webservers

  - by enrico

  I have a website that is split into two different servers: chat server in node.js normal website (lighttpd + php + whatever) now, I have set HAProxy in the same machine as node.js chat, so that when my website is accessed, it will redirect to the chat login. (Eg: mysite.com/messenger) What I want to do now is to put a link on the chat page to send to the other part of the website which has a normal files tree, like home.php, photos.php, settings.php, etc. but I really have no clue how this whole redirection works. Also, what about URL rewriting? If I have like info.php?item=phone and want to change it to mysite.com/phone ... is this something I should do with HAProxy or with lighttpd? Thanks in advance.

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• Can FileOutputStream() take a relative path as an argument

  - by Ankur

  I am creating a FileOutputStream object. It takes a file or String as an argument in its constructor. My question is, can I give it a relative URL as an argument for the location of a file, it doesn't seem to work, but I am trying to work out if this is possible at all (if not I will stop trying). If it is not possible, how can I (from a servlet) get the absolute path (on the filesystem, not the logical URL) to the current location in such a way that I can pass that to the constructor. Part of my problem is that my dev box is Windows but I will publish this to a Unix box, so the paths cannot be the same i.e. on Windows C:/.... and on unix /usr/...

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• Good excuses NOT to use version control

  - by Kent Fredric

  This question may seem backwards to all logical reasoning, but I encountered a team member who was working on a side project out of the main tree, and had decided ( rephrased ) I'm the only developer, we don't need version control, that's stupid Now personally, the idea horrifies me, and I can't for one justify it. So now my stance is clear, I want some legitimate answers why somebody can excuse themselves from using version control. The default answers will of course be "there is no excuse". Not what I want to see. If you can't see an excuse, then just don't post. ( Feel free to downmod excuses others post that are illegitimate/bad and give reasoning )

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• Installing Java 6 on Ubuntu 10.04 fails on missing Java 6 JRE package

  - by David S

  I'm trying to install Java 6 on Ubuntu 10.04 and it's been harder than it should be. In another question about installing Java on Ubuntu/Linux it said that I needed to do the following: sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" However, that failed and I kept getting: sudo: add-apt-repository: command not found The solution to this, was to run: sudo apt-get install python-software-properties So, that seemed to work and the command above to "add-apt-repository" seems to complete with no errors. And I have run the following to confirm it got added. sudo vi /etc/apt/sources.list But, now when I run the following: sudo apt-get install sun-java6-jre I get: Reading package lists... Done Building dependency tree Reading state information... Done Package sun-java6-jre is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package sun-java6-jre has no installation candidate Where do I go from here?

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• Allow for modular development while still running in same JVM?

  - by Marcus

  Our current app runs in a single JVM. We are now splitting up the app into separate logical services where each service runs in its own JVM. The split is being done to allow a single service to be modified and deployed without impacting the entire system. This reduces the need to QA the entire system - just need to QA the interaction with the service being changed. For inter service communication we use a combination of REST, an MQ system bus, and database views. What I don't like about this: REST means we have to marshal data to/from XML DB views couple the systems together which defeats the whole concept of separate services MQ / system bus is added complexity There is inevitably some code duplication between services You have set up n JBoss server configurations, we have to do n number of deployments, n number of set up scripts, etc, etc. Is there a better way to structure an internal application to allow modular development and deployment while allowing the app to run in a single JVM (and achieving the associated benefits)?

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• What hardware is at physical address 0x80000000 on powerpc New World Macintosh?

  - by tinkerer

  Open Firmware device tree gives no clue what device might decode at physical address 0x80000000 to 0x8008200 on a G4 New World Macintosh. The mmu has three adjacent Virtual=Real translations for that block. They are the only address translations reported between the top or physical dram at 20000000 and the start of the PCI bridges at f0000000. (A possible clue is that frame-buffer-addr is reported as 9c008000 by Open Firmware, and that is not in the reported translation table either). I believe the architecture has been around since about 1999.

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• 'Lexical' scoping of type parameters in C#

  - by leppie

  I have 2 scenarios. This fails: class F<X> { public X X { get; set; } } error CS0102: The type 'F' already contains a definition for 'X' This works: class F<X> { class G { public X X { get; set; } } } The only logical explanation is that in the second snippet the type parameter X is out of scope, which is not true... Why should a type parameter affect my definitions in a type? IMO, for consistency, either both should work or neither should work. Any other ideas? PS: I call it 'lexical', but it probably is not not the correct term.

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• Tool to automatically add tracing or instrumentation to an .NET app?

  - by Tony_Henrich

  I have a .NET app which runs once a day. Sometimes there's a logical error somewhere which occurs randomly. Is there a tool like Eqatec's Tracer which automatically injects instrumentation in the code and logs everything to a file? The issue with Eqatec's Tracer is that it opens a window on the machine and it doesn't seem to log. My issue rarely occurs and I need to keep all logs for a long time. I don't want to change the source code and add logging statements all over the place. I am aware of PostSharp & Logfaces.

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• easiest way to (download and) convert HTML-structures into EPUB?

  - by gojira

  How would one (download and) convert HTML-structures into EPUB (or any other format suitable for the Sony PRS-505 reader)? My question is not how to convert a single HTML file into an EPUB file, as this is easy; what I mean is, I have some books I want to read on my Sony PRS-505 and these books are most often online in HTML format but withmany interlinked pages and there is one page with the list of contents, like this example http://www.edge.org/documents/ThirdCulture/d-Contents.html ... or sometimes it's a little bit more complicated as the list of contents only lists the chapters, and inside the chapters there are links to sub-chapters, like in this example: http:SLASHSLASHwww.hyw.com/Books/WargamesHandbook/Contents.htm (I can only post 1 hyperlink now b/c of user restriction, so this is why there is SLASHSLASH instead of //) I want to convert these examples and several others, with correct chapters, images and some acceptable formatting etc, so basically I want to make a proper ebook out of the HTML-tree. What is the easiest way?

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• Declaring pointers; asterisk on the left or right of the space between the type and name?

  - by GenTiradentes

  I've seen mixed versions of this in a lot of code. (This applies to C and C++, by the way.) People seem to declare pointers in one of two ways, and I have no idea which one is correct, of if it even matters. The first way it to put the asterisk adjacent the type name, like so: someType* somePtr; The second way is to put the asterisk adjacent the name of the variable, like so: someType *somePtr; This has been driving me nuts for some time now. Is there any standard way of declaring pointers? Does it even matter how pointers are declared? I've used both declarations before, and I know that the compiler doesn't care which way it is. However, the fact that I've seen pointers declared in two different ways leads me to believe that there's a reason behind it. I'm curious if either method is more readable or logical in some way that I'm missing.

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• Connecting server to more than one switch.

  - by Jake

  I have 3 switches, one NEATGEAR GS748T and two JGS524. Initially I wanted to connect them in a triangle loop, but later suspect that the JG524 does not have spanning tree support. Now I have a Dell R710 with 2 NIC at the back. If I connect the server in between the two JGS524, which both in turn connect to the GS748T, will that consitute a loop? According to my limited understanding, with 2 NICs there will be 2 IPs for the server. Will the file server even work or not? Theoretically speaking, will this configuration increase the access speeds for clients? Thanks.

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• Why does sh/bash set command line parameter values when trying to set environment variable?

  - by Touko

  A question on basics : While tuning environment variables for a program launched from a script, I ended up with somewhat strange behaviour with sh (which seems to be actually linked to bash) : variable setting seems to mess up with command-line parameters. Could somebody explain why does this happen? A simple script: #! /bin/sh # Messes with $1 ?? set ANT_OPTS=-Xmx512M export ANT_OPTS # Works # export ANT_OPTS=-Xmx512M echo "0 = $0" echo "1 = $1" When I run this with the upper alternative (set + export), the result is as following: $ ./test.sh foo 0 = ./test.sh 1 = ANT_OPTS=-Xmx512M But with lower alternative (export straight), the result is as I supposed: $ ./test.sh foo 0 = ./test.sh 1 = foo There is surely logical explanation, I just haven't figured it out yet. Somebody who does have idea? br, Touko

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• How can I see the structure of a webpage inline?

  - by Coldblackice

  How can I see a webpage's structure "inline" with the visual representation of the actual page, all at once? I'm trying to understand HTML layout better, but it's hard to get a feel for it, even having the source open on a separate monitor, because there's just so much expansive and miscellaneous code. I suppose I could sift through it, clean it up, and set up some type of custom collapsible tree system, but that would take too long for the amount of pages I'd like to get a quick view of the layout/structure of. For reference, I'm using Firefox for my internet browsing.

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• What tool can I use to definitely kill a process on Windows?

  - by Moak

  Can anyone recommend an application (preferably usb-portable that doesn't require setup) That really kills a process immediately in windows XP? I ask this because often when I need to use the XP task manager it seems to want to go about it "the polite way" and sometimes crashed programs don't quit or take a minute to shut down. I need a real stone cold killer, not a pushover-could-you-please-quit-now-no?-ok-sorry-program Edit I'm sorry if it wasn't clear previously but I did mean the situation when even the "End process" command in Process tab of the task manager doesn't kill a program, however one of the answers did point me to the "End Process Tree" command which I've never noticed (when right clicking on the process)

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• unexpected result from gnu sort

  - by funkycat

  when I try to sort the following text file 'input': test1 3 test3 2 test 4 with the command sort input the output is exactly the input. Here is the output of od -bc input : 0000000 164 145 163 164 061 011 063 012 164 145 163 164 063 011 062 012 t e s t 1 \t 3 \n t e s t 3 \t 2 \n 0000020 164 145 163 164 011 064 012 t e s t \t 4 \n 0000027 It's just a tab separated file with two columns. When I do sort -k 2 The output changes to test3 2 test1 3 test 4 which is what I would expect. But if I do sort -k 1 nothing changes with respect to the input, whereas I would expect 'test' to sort before 'test1'. Finally, if I do cat input | cut -f 1 | sort I get test test1 test3 as expected. Is there a logical explanation for this? What exactly is sort supposed to do by default, something like: sort -k 1 ? My version of sort: sort (GNU coreutils) 7.4

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• How to preserve object identity across different VMs

  - by wheleph

  To be specific let me illustrate the question with Spring http-remoting example. Suppose we have such implementation of a simple interface: public SearchServiceImpl implements SearchService { public SearchJdo processSearch(SearchJdo search) { search.name = "a funky name"; return search; } } SearchJdo is itself a simple POJO. Now when we call the method from a client through http-remoting we'll get: public class HTTPClient { public static void main(final String[] arguments) { final ApplicationContext context = new ClassPathXmlApplicationContext( "spring-http-client-config.xml"); final SearchService searchService = (SearchService) context.getBean("searchService"); SearchJdo search = new SearchJdo(); search.name = "myName"; // this method actually returns the same object it gets as an argument SearchJdo search2 = searchService.processSearch(search); System.out.println(search == search2); // prints "false" } } The problem is that the search objects are different because of serializaton although from logical prospective they are the same. The question is whether there are some technique that allows to support or emulate object identity across VMs.

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• Getting Parent Layout in Qt

  - by Austin

  Hi, quick question. Is there any way to (easily) retrieve the parent layout of a widget in Qt? PS: QObject::parent() won't work, for logical reasons. EDIT: I'm positive the widget has a parent layout, because I added it to a layout earlier in the code. Now, I have many other layouts in the window and while it is possible for me to keep track of them, I just want to know if there is an easy and clean way to get the parent layout. EDIT2: Sorry, "easy and clean" was probably not the best way of putting. I meant using the Qt API. EDIT3: I'm adding the widget to the layout like this: QHBoxLayout* layout = new QHBoxLayout; layout-addWidget(button);

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• Translate MSOffice menus from Chinese to English

  - by terence_laoshi

  Hi! I'm stuck in China using a Chinese language MSOffice package (Home and Student). All of the menus and system instructions are in Chinese. I know there's a pack I can buy but that's not an option for this computer and this temporary situation. Is there another way to convert from Chinese to English? OR is there a site that provides some type of tree of all the menu and system information in English. At least that might help. I've done individual searches for a couple of items but that is incredibly time consuming in order to make a simple operational change. Thanks for any help.

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• What is the algorithm used by the memberwise equality test in .NET structs?

  - by Damian Powell

  What is the algorithm used by the memberwise equality test in .NET structs? I would like to know this so that I can use it as the basis for my own algorithm. I am trying to write a recursive memberwise equality test for arbitrary objects (in C#) for testing the logical equality of DTOs. This is considerably easier if the DTOs are structs (since ValueType.Equals does mostly the right thing) but that is not always appropriate. I would also like to override comparison of any IEnumerable objects (but not strings!) so that their contents are compared rather than their properties. This has proven to be harder than I would expect. Any hints will be greatly appreciated. I'll accept the answer that proves most useful or supplies a link to the most useful information. Thanks.

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• Why not speed up testing by using function dependency graph?

  - by Maltrap

  It seems logical to me that if you have a dependency graph of your source code (tree showing call stack of all functions in your code base) you should be able to save a tremendous amount of time doing functional and integration tests after each release. Essentially you will be able to tell the testers exactly what functionality to test as the rest of the features remain unchanged from a source code point of view. If for instance you change a spelling mistake in once piece of the code, there is no reason to run through your whole test script again "just in case" you introduced a critical bug. My question, why are dependency trees not used in software engineering and if you use them, how do you maintain them? What tools are available that generate these trees for C# .NET, C++ and C source code?

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• Will Hotmail DELIVER to spam-friendly ISP?

  - by Oddthinking

  I have a user who is using Hotmail to communicate with one of our suppliers. Recently, Hotmail started bouncing emails to that address (while other ISPs are working fine.) Hotmail bounce messages contain very little details. Investigating, I found that the supplier's ISP has appeared on a blacklist of ISPs who do not do enough to prevent spamming from their users. (Note: Neither my user nor the supplier are mass-mailing.) In the circumstances, I can understand Hotmail declining to accept emails from the host, or accepting them but being quick to mark them as spam. However, I am surprised that they might refuse delivery. Does this sound plausible to you, or am I barking up the wrong tree?

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• Why does subshell not inherit exported variable (PS1)?

  - by amn

  After some debugging I finally narrowed down the problem as to why my X session xterm prompt does not appear according to my PS1 setting. If I run sh -c env, it doesn't even show PS1 in the list. Why? export PS1='test' sh -c env # No PS1 in the list, default prompt appearance (shell name + version) Substituting sh with bash yields same result, alas the behavior appears to be the same for both shells/modes. As far as I understood from man bash, the environment resulting from command run by shell with -c should include the exported variables. And it does - exporting FOOBAR results in FOOBAR listed in env run by subshell. It appears that the story is different if the variable is PS1 however. What is going on? I want my prompt propagated throughout the process tree and system. For matters sake, it is set in /etc/profile.d/user.sh (a file I created myself) with the following: PS1='\u@\H \w \$ ' export PS1 I am running Arch Linux (updated yesterday.)

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• Need help with ruby radiant cms

  - by AnimalCode

  I have some hidden pages like this: /staff John Bob Mike In all this pages i have extended content, like photo, bio and additional info. I make this, to have logical structure and quick edit without editing radiant code. My question is, how i can with base radius functional get access to this pages in this code: <r:find url="/staff"> <r:children:each by="title" order="asc"> <r:title /> </r:children:each> </r:find>

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• Django many-to-many relationship to self with extra data, how do I select from a certain direction?

  - by Jake

  I have some hierarchical data where each Set can have many members and can belong to more than one Set(group) Here are the models: class Set(models.Model): ... groups = models.ManyToManyField('self', through='Membership', symmetrical=False) members = models.ManyToManyField('self', through='Membership', symmetrical=False) class Membership(models.Model): group = models.ForeignKey( Set, related_name='Members' ) member = models.ForeignKey( Set, related_name='Groups' ) order = models.IntegerField( default=-1 ) I want to know how to get all the members or all the groups for a Set instance. I think I can do it as follows, but it's not very logical, can anyone tell me what's going on and how I should be doing it? # This gives me a set of Sets # Which seems to be the groups this Set belongs to set_instance.set_set.all() # These give me a set of Memberships, not Sets set_instance.Members.all() set_instance.Groups.all() # These they both return a set of Sets # which seem to be the members of this one set_instance.members.all() set_instance.groups.all()

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• Installing the Apple Root Certificate Authority on CentOS CLI

  - by Daniel Hollands

  I could be barking up the wrong tree here, but I'm looking for help on installing Apple's Root certificate (http://www.apple.com/certificateauthority/) on a CentOS server via the command line - which I need to send messages to their APNS system. The code I'm using for this purpose is a variation on this: https://github.com/jPaolantonio/SimplePush/blob/master/simplepush.php - which works perfectly well on a Windows server, but as soon as we try to use it on a CentOS one, it falls over. We're lead to believe this has something to do with not having the CA installed on our CentOS box - but all efforts to do so have failed. As the CentOS server is headless, we need the ability to do this via the commandline. Can someone help?

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