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  • Anyone know the state of cocoa#?

    - by Ira Rainey
    Having just updated Mono to 2.6.3 (on OS X), I noticed in the installer that cocoa# 0.9.5 is also installed. However using MonoDevelop there are no cocoa# project templates by default, and I was wondering if anyone knew more about creating cocoa# apps. If you goto the cocoa# page on the Mono site you can see it hasn't been updated since 2008, and cocoa-sharp.com has nothing on it at all now. Has this project fallen by the wayside? If so, does anyone know of any alternatives? Winforms apps running under X11 are butt ugly and GTK# isn't much better. To have a solid bridge between Mono and Cocoa would be ideal for developing OS X desktop apps, in the same way as the MonoTouch does with Cocoa Touch for the iPhone. Any thoughts?

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  • Ruby GUI (non-complex layouts)

    - by Ruby Novice
    I've done quite a bit of research on Ruby GUI design, and it appears to be the one area where Ruby tends to be behind the curve. I've explored the options of MonkeyBars, wxRuby, fxRuby, Shoes, etc. and was just wanted to get some input from the Ruby community. While they're definitely usable, the development on each seems to have fallen off. There is not a great deal of useful documentation or user bases that I could find on any (minus the fxRuby book). I'm just looking to make a simple GUI, so I don't really want to spend hundreds of hours learning the intricacies of the more complex tools or attempt to use something that is no longer even being developed (Shoes is the type of application I'm looking for, but it's extremely buggy and not being actively developed.) Out of all of the options, which would you guys recommend as being the quickest to pick up and that still has some sort of development base? Thanks!

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  • Young people using Emacs?

    - by bigmonachus
    I am a college student that has fallen in love with Emacs. I have used IDEs in the past, and although features like Intellisense made the switch to Emacs very hard, I now think that Emacs is much more powerful, and features like Intellisense can be pretty closely matched by various modes depending on language (and I am not referring to M-/). I am happily writing Elisp code for everything that I need that isn't provided by modes or by Emacs itself and I love the way that it adapts and molds to my needs. However, I do think that its main disadvantage is the fact that it has a pretty steep learning curve and that most new programmers will not even begin to learn it out of many common misconceptions. So, I want to know the opinions of young people (or any person who didn't start using Emacs before there were IDEs) that are Emacs users. Just to get some reassurance that Emacs is not dead within our Eclipse-loving generation =). (Opinions of users of any other highly extensible editor like Jedit are also welcome)

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  • TCP Flow control in AS3?

    - by Jeremy Stanley
    I am currently working on a Flash socket client for a pre-existing service/standard. The service uses TCP flow control to throttle itself and the Flash socket is reading in everything as fast as it can despite not being able to process it as fast as it's being taken in. This causes the bytesAvailable on the socket to keep increasing and the server never knows that the client has fallen behind. In short, is there any way to limit the size of bytesAvailable for a Flash Socket object or throttle it in some other way? Note: Rewriting the server isn't a viable option at the current time as it's a standard and the client's utility drops immensely if server-side changes are needed

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  • java vs python. In what way is Java Better?

    - by oxinabox.ucc.asn.au
    What are the advantages of Java over Python? What are the disadvantagesof Python, over Java? Why isn't Java more like Python? Like why don't java have an command line iterpretor? I beleive Java must have some advantages, but...I'm yet to see them. Logically all languages have an advantage afaict: I learnt java before python, - a 6 month unicourse. I spend a couple of weeks using python (writting a script to make a C source file). I hated it at first (as it was so differnt from C). I realised I had fallen in love it it, when I noticed that when I went to do a follow on Java Course at uni, I'ld stopped giving my variables types, and was tryign to multiply strings.

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  • Protect my PHP App

    - by Abs
    Hello all, I have developed an app and its written in PHP (with a bunch of SQL scripts), this app will be used by a few small companies. For them to use it, I will have to install Apache and SQL Server for them. Every method I have thought has fallen short of what I need. I was actually just hoping to use ZendGuard or IonCube but they don't support PHP 5.3.x. Is there a simpler method where I can maybe store a key in the database and make the app run only when it knows its on that server? Maybe create a key based on some random numbers/letters and the machine name, sql server host name and encode/decode this when ever the system is in use? Thanks all for any help or ideas

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  • Don&rsquo;t Forget! In-Memory Databases are Hot

    - by andrewbrust
    If you’re left scratching your head over SAP’s intention to acquire Sybase for almost $6 million, you’re not alone.  Despite Sybase’s 1990s reign as the supreme database standard in certain sectors (including Wall Street), the company’s flagship product has certainly fallen from grace.  Why would SAP pay a greater than 50% premium over Sybase’s closing price on the day of the announcement just to acquire a relational database which is firmly stuck in maintenance mode? Well there’s more to Sybase than the relational database product.  Take, for example, its mobile application platform.  It hit Gartner’s “Leaders’ Quadrant” in January of last year, and SAP needs a good mobile play.  Beyond the platform itself, Sybase has a slew of mobile services; click this link to look them over. There’s a second major asset that Sybase has though, and I wonder if it figured prominently into SAP’s bid: Sybase IQ.  Sybase IQ is a columnar database.  Columnar databases place values from a given database column contiguously, unlike conventional relational databases, which store all of a row’s data in close proximity.  Storing column values together works well in aggregation reporting scenarios, because the figures to be aggregated can be scanned in one efficient step.  It also makes for high rates of compression because values from a single column tend to be close to each other in magnitude and may contain long sequences of repeating values.  Highly compressible databases use much less disk storage and can be largely or wholly loaded into memory, resulting in lighting fast query performance.  For an ERP company like SAP, with its own legacy BI platform (SAP BW) and the entire range of Business Objects and Crystal Reports BI products (which it acquired in 2007) query performance is extremely important. And it’s a competitive necessity too.  QlikTech has built an entire company on a columnar, in-memory BI product (QlikView).  So too has startup company Vertica.  IBM’s TM1 product has been doing in-memory OLAP for years.  And guess who else has the in-memory religion?  Microsoft does, in the form of its new PowerPivot product.  I expect the technology in PowerPivot to become strategic to the full-blown SQL Server Analysis Services product and the entire Microsoft BI stack.  I sure don’t blame SAP for jumping on the in-memory bandwagon, if indeed the Sybase acquisition is, at least in part, motivated by that. It will be interesting to watch and see what SAP does with Sybase’s product line-up (assuming the acquisition closes), including the core database, the mobile platform, IQ, and even tools like PowerBuilder.  It is also fascinating to watch columnar’s encroachment on relational.  Perhaps this acquisition will be columnar’s tipping point and people will no longer see it as a fad.  Are you listening Larry Ellison?

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  • To File Share or to not File Share, that is the Question.

    To file share or to not file share, that is the question. The concept of the internet was developed in the 1960’s as a revolutionary idea to share information and data amongst a group of computers. The original concept was to allow universities and the United States Military share data for research and field operations. This network of computers was designed to provide redundant data storage and communications in case one or more locations were destroyed. Since the inception of the internet, people have attempted to use it for sharing data. As the Internet has evolved so did the users and the information they wanted to share. In today’s modern internet people can share information through various avenues, for example: websites, social networks, email, documents, executable files, data files and much more.  Unfortunately, as the internet and its users have grown, some industries have not paid attention. Currently, there are several industries that have really fallen behind in keeping up with current trends, and are severely paying the price for their lack of action. A current example of this is with the Recording Industry Association of America (RIAA) and file sharing. RIAA contends that customers who purchase music can only listen to the music and cannot share it with others. This can be seen when the RIAA sued Napster for distributing copyrighted music through a technology called file sharing. File sharing as defined by the Media Awareness Network is downloadable software that permits users to share music, video, image or book files directly with peers. Users of file sharing networks simply had to extract the music from a CD into a music compatible format. Typically most music files at that time where saved as MPEG file format. Once the users got music in this format it was very easy share their music with others. The big question now is who actually owns the music, does the music industry still retain the rights of the music regarding who has access to listen to it, or is it up to the owner of the music CD.  According to the First – Sale Doctrine, it is the right of the purchaser of the CD to decide who can access the information on the CD. In addition, the original owner looses all rights to the music once it has been sold.  The importance of defining who actually owns the music has a great impact on the future of the industry. If the industry is determined to be the actual owner of the music then anyone who has shared at least 1 fine with another is guilty of violating the copyright. However, if the owners of the CD are determined to be the owners of the music then the music industry will have to figure out some other way to protect their music so that it is more lucrative for them or they will go out of business. References: http://www.walthowe.com/navnet/history.html http://www.media-awareness.ca/english/resources/special_initiatives/wa_resources/wa_shared/backgrounders/internet_glossary.cfm#F

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  • Music before bells and whistles

    - by Tony Davis
    Why is it that Windows has so much difficulty in finding content on its file system? This is not an insurmountable technical problem; on my laptop, I have a database within which I can instantly find text or names within millions of records, within 300 milliseconds. I have a copy of Google Desktop that can find phrases within emails or documents, almost as quickly. It is an important, though mundane, part of an operating system to be able to find files. The first thing I notice within Windows is that the facility to find files or text within files is called 'search' rather than 'find'. Hmm. This doesn’t bode well. What’s this? It does a brute-force search for file names? Here we are in an age when we can breed mice that glow in the dark, and manufacture computers that fit in our shirt pockets, and we find an operating system that is still entirely innocent of managing and indexing content in hierarchical data. I can actually read the files of my PC into a database, mimic the directory/folder hierarchies and then find files in a flash; but when I do the same with Windows Vista, we are suddenly back in a 1960s time warp. Finding files based on their name is bad enough, but finding files based on the content that they contain is more or less asking for an opportunity to wait 20 minutes in order to see a "file not found" message. Sadly, with Windows 7, Microsoft seems to have fallen into the familiar trap of adding bells and whistles before finishing the song. It's certainly true that Microsoft has added new features and a certain polish to Windows Search 4.0, the latest incarnation. It works more like a web search and offers a new search syntax, called Advanced Query Syntax, which allows you to search on file author, file size, date ranges (e.g. date:=7/4/09still does not work reliably. I've experienced first-hand its stubborn refusal, despite a full index, to acknowledge the existence of a file I know exists, based on a search for a specific term within that file that I know is in there somewhere; a file that Google Desktop search, or old wingrep, finds in seconds. When users hark back to the halcyon days of Windows XP search, you know something is seriously amiss. Shouldn't applications get the functionality right before applying animated menus and Teletubby graphics, or is advancing age making me grumpy? I’d be pleased to hear your views, as always. Cheers, Tony.

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  • Au revoir, Python?

    - by GuySmiley
    I'm an ex-C++ programmer who's recently discovered (and fallen head-over-heels with) Python. I've taken some time to become reasonably fluent in Python, but I've encountered some troubling realities that may lead me to drop it as my language of choice, at least for the time being. I'm writing this in the hopes that someone out there can talk me out of it by convincing me that my concerns are easily circumvented within the bounds of the python universe. I picked up python while looking for a single flexible language that will allow me to build end-to-end working systems quickly on a variety of platforms. These include: - web services - mobile apps - cross-platform client apps for PC Development speed is more of a priority at the time-being than execution speed. However, in order to improve performance over time without requiring major re-writes or architectural changes I think it's imperative to be able to interface easily with Java. That way, I can use Java to optimize specific components as the application scales, without throwing away any code. As far as I can tell, my requirement for an enterprise-capable, platform-independent, fast language with a large developer base means it would have to be Java. .NET or C++ would not cut it due to their respective limitations. Also Java is clearly de rigeur for most mobile platforms. Unfortunately, tragically, there doesn't seem to be a good way to meet all these demands. Jython seems to be what I'm looking for in principle, except that it appears to be practically dead, with no one developing, supporting, or using it to any great degree. And also Jython seems too married to the Java libraries, as you can't use many of the CPython standard libraries with it, which has a major impact on the code you end up writing. The only other option that I can see is to use JPype wrapped in marshalling classes, which may work although it seems like a pain and I wonder if it would be worth it in the long run. On the other hand, everything I'm looking for seems to be readily available by using JRuby, which seems to be much better supported. As things stand, I think this is my best option. I'm sad about this because I absolutely love everything about Python, including the syntax. The perl-like constructs in Ruby just feel like such a step backwards to me in terms of readability, but at the end of the day most of the benefits of python are available in Ruby as well. So I ask you - am I missing something here? Much of what I've said is based on what I've read, so is this summary of the current landscape accurate, or is there some magical solution to the Python-Java divide that will snuff these concerns and allow me to comfortably stay in my happy Python place?

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  • Oracle's Cloud Strategie nach der OOW 2012

    - by Manuel Hossfeld
    Auf der diesjährigen Oracle Open World war „die Cloud“ nicht nur ein vielbenutztes Buzzword, sondern auch Anlass für einige interessante Ankündigungen. Wer keine Zeit oder Muße hatte, sich die entsprechenden Keynotes von Larry Ellison und Thomas Kurian anzuhören, erfährt in diesem Artikel die wesentlichen Änderungen. Die erste Neuerung: Oracle wird in Zukunft alle drei „Sorten“ bzw. „Ebenen“ von Cloud Computing anbieten: SaaS (Software as a Service) – die Bereitstellung von kompletten Fachanwendungen z.B. aus der eBusiness Suite in Form eines Mietmodells - gab es schon länger. Abgesehen von der Tatsache, dass hier zusätzliche/neuere Komponenten und Module der durch die letzten Zukäufe von Oracle noch breiter gewordenen Palette angeboten werden, ändert sich am Prinzip nichts. Bei PaaS (Plattform as a Service) sind vor allem die beiden bereits letztes Jahr angekündigten Dienste „Database Service“ (basierend auf APEX) und „Java Service“ (basierend auf Weblogic) zu nennen, für die nun auch konkrete Pakete und Preise (ca.175$ bis 2000$/Monat) sowie die Möglichkeit zur Anmeldung auf http://cloud.oracle.com vorliegen. Interessanterweise gehört auch ein sog. „Social Service“ in diese Schicht, mit der Oracle Kunden ihre Anwendungen in Zukunft auf standardisierte Weise durch Social Networking Funktionalität wie z.B. Microblogging erweitern können.Ebenso neu angekündigt wurde ein "Developer Service", welcher z.B. Sourcecode-Verwaltung durch GIT Repositories sowie Wikis und Issue Tracking bereit stellen soll. Die dort mittels JDeveloper, Netbeans oder Eclipse erstellten Applikationen können dann nahtlos innerhalb kürzester Zeit in den Java Service deployed werden. Komplett neu und für einige sicher überraschend ist hingegen der Bereich IaaS (Infrastructure as a Service) – Hier geht es um die Bereitstellung von Basis-Infrastrukturkomponenten wie Storage, Rechenleistung (letztlich also Betriebssysteme / VMs) und Messaging / Queueing. Genaue Details oder Preise zu den IaaS Angeboten sind noch nicht bekannt, aber zumindest zu den Storage- und Messaging Services können grundlegende Daten bereits auf http://cloud.oracle.com eingesehen werden Die zweite Neuerung: Kunden können in Zukunft als Alternative zum Betrieb der o.g. „Oracle Cloud“, diese auch komplett hinter ihrer eigenen Firewall aufbauen lassen. Mit anderen Worten: Oracle baut und betreibt bei diesem als „Oracle Private Cloud“ bezeichneten Angebot alle Komponenten selbst – die Daten verlassen aber niemals das Gebäude des Kunden. Letzteres ist gerade bei uns im Datenschutz-sensiblen Deutschland ein wichtiger Aspekt. Da die verwendeten Komponenten in beiden Fällen die gleichen sind, ist auch ein „Umziehen“ oder Erweitern der Private Cloud in die Public Cloud (oder zurück) ohne Änderungen an den Anwendungen möglich. Der Möglichkeit einer "Hybrid Cloud", bei der Teile einer Anwendung hinter der eigenen Firewall, andere Teile aber in der Oracle Cloud laufen, wird damit Realität.

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  • Managing accounts on a private website for a real-life community

    - by Smudge
    Hey Pro Webmasters, I'm looking at setting-up a walled-in website for a real-life community of people, and I was wondering if anyone has any experience with managing member accounts for this kind of thing. Some conditions that must be met: This community has a set list of real-life members, each of whom would be eligible for one account on the website. We don't expect or require that they all sign-up. It is purely opt-in, but we anticipate that many of them would be interested in the services we are setting up. Some of the community members emails are known, but some of them have fallen off the grid over the years, so ideally there would be a way for them to get back in touch with us through the public-facing side of the site. (And we'd want to manually verify the identity of anyone who does so). Their names are known, and for similar projects in the past we have assigned usernames derived from their real-life names. This time, however, we are open to other approaches, such as letting them specify their own username or getting rid of usernames entirely. The specific web technology we will use (e.g. Drupal, Joomla, etc) is not really our concern right now -- I am more interested in how this can be approached in the abstract. Our database already includes the full member roster, so we can email many of them generated links to a page where they can create an account. (And internally we can require that these accounts be paired with a known member). Should we have them specify their own usernames, or are we fine letting them use their registered email address to log-in? Are there any paradigms for walled-in community portals that help address security issues if, for example, one of their email accounts is compromised? We don't anticipate attempted break-ins being much of a threat, because nothing about this community is high-profile, but we do want to address security concerns. In addition, we want to make the sign-up process as painless for the members as possible, especially given the fact that we can't just make sign-ups open to anyone. I'm interested to hear your thoughts and suggestions! Thanks!

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  • Managing accounts on a private website for a real-life community

    - by Smudge
    I'm looking at setting-up a walled-in website for a real-life community of people, and I was wondering if anyone has any experience with managing member accounts for this kind of thing. Some conditions that must be met: This community has a set list of real-life members, each of whom would be eligible for one account on the website. We don't expect or require that they all sign-up. It is purely opt-in, but we anticipate that many of them would be interested in the services we are setting up. Some of the community members emails are known, but some of them have fallen off the grid over the years, so ideally there would be a way for them to get back in touch with us through the public-facing side of the site. (And we'd want to manually verify the identity of anyone who does so). Their names are known, and for similar projects in the past we have assigned usernames derived from their real-life names. This time, however, we are open to other approaches, such as letting them specify their own username or getting rid of usernames entirely. The specific web technology we will use (e.g. Drupal, Joomla, etc) is not really our concern right now -- I am more interested in how this can be approached in the abstract. Our database already includes the full member roster, so we can email many of them generated links to a page where they can create an account. (And internally we can require that these accounts be paired with a known member). Should we have them specify their own usernames, or are we fine letting them use their registered email address to log-in? Are there any paradigms for walled-in community portals that help address security issues if, for example, one of their email accounts is compromised? We don't anticipate attempted break-ins being much of a threat, because nothing about this community is high-profile, but we do want to address security concerns. In addition, we want to make the sign-up process as painless for the members as possible, especially given the fact that we can't just make sign-ups open to anyone. I'm interested to hear your thoughts and suggestions! Thanks!

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  • POST and PUT requests – is it just the convention?

    - by bckpwrld
    I've read quite a few articles on the difference between POST and PUT and in when the two should be used. But there are still few things confusing me ( hopefully questions will make some sense ): 1) We should use PUT to create resources when we want clients to specify the URI of the newly created resources and we should use POST to create resources when we let service generate the URI of the newly created resources. a) Is it just by convention that POST create request doesn't contain an URI of the newly created resource or POST create request actually can't contain the URI of the newly created resource? b) PUT has idempotent semantics and thus can be safely used for absolute updates ( ie we send entire state of the resource to the server ), but not also for relative updates ( ie we send just changes to the resource state ), since that would violate its semantics. But I assume it's still possible for PUT to send relative updates to the server, it's just that in that case the PUT update won't be idempotent? 2) I've read somewhere that we should "use POST to append a resource to a collection identified by a service-generated URI". a) What exactly does that mean? That if URIs for the resources were generated by a server ( thus the resources were created via POST ), then ALL subsequent resources should also be created via POST? Thus, in such situation no resource should be created via PUT? b) If my assumption under a) is correct, could you elaborate why we shouldn't create some resources via POST and some via PUT ( assuming server already contains a collection of resources created via POST )? REPLY: 1) Please correct me if I'm wrong, but from your post and from the link you've posted, it seems: a) The Request-URI in POST is interpreted by server as the URI of the service. Thus, it could just as easily be interpreted as an URI of a newly created resource, if server code was written to recognize Request-URI as such b) Similarly, PUT is able to send relative updates, it's just that service code is usually written such that it will complain if PUT updates are relative. 2) Usually, create has fallen into the POST camp, because of the idea of "appending to a collection." It's become the way to append a resource to a list of resources. I don't quite understand the reasoning behind the idea of "appending to a collection" and why this idea prefers POST for create. Namely, if we create 10 resources via PUT, then server will contain a collection of 10 resources and if we then create another resource, then server will append this resource to that collection ( which will now contain 11 resources )?! Uh, this is kinda confusing thank you

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  • Response: Agile's Second Chasm

    - by Malcolm Anderson
    William Pietri over at Agile Focus has written an interesting article entitled, "Agile’s Second Chasm (and how we fell in)" in which he talks about how agile development has fallen into a common trap where large companies are now spending a lot of money hiring agile (Scrum) consultants just so that they can say they are agile, but all the while avoiding any change that is required by Scrum.   It echoes the questions that I've been asking for a while, "Can a fortune 500 company actually do agile development?"  I'm starting to think that the answer is "usually not"   William ask 3 questions at the end of his article that I will answer here.   1) Have I seen agile development brought in and then preemptively customized (read: made into ScrummerFall)?   Yes, Scrum is hard and disruptive.  It's a spotlight on company dysfunction.  In a low trust environment like most fortune 500 companies Scrum will be subverted by anyone who has ever seen "transparency" translate into someone being laid off.   2) If I had to do it all over again, would I change anything?  No, this is a natural progression, but the agile principles are powerful enough, that the companies that don't adopt them will no longer be competitive and will start to fail.   3) Is this situation solvable?  I think it is.  I think that one of the issues is that you often see companies implementing Scrum, but avoiding the agile engineering practices.  I believe that you cannot do one without the other.  Scrum keeps the ship sailing in smooth deep waters.  The agile engineering practices keep the engine running smoothly and cleanly.  If you implement agile engineering practices without Scrum, you run the risk of ending up with a great running piece of software that is useful to no one.  On the other hand, implementing cargo-cult Scrum without the agile engineering practices and you end up (especially in a fortune 500 company) being steered in the right direction, but with your development practices coming to a dead halt because you have code that can not keep up with the changes in requirements.   If you are trying to do Scrum, make sure that you hire some agile engineering coaches, or else you may find your deveolpment engines grinding to a dead halt in the middle of the open ocean.

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  • Why have trackballs almost disappeared? [closed]

    - by Gary M. Mugford
    One of the movement sensors in my Microsoft Trackball Explorer has failed and right now I am using a mouse. Ugggh! I'll got steal one of the various Logitech trackballs spread around the house, but they all have issues. The Trackman has a horrible placement for the scroll wheel. Others have marbles for the thumb rather than a big ball for the fingers and at least one trackball is working around here without having a scroll wheel at all! (The one at the dinner table, for when I dine alone). My question is, why have trackballs fallen into disfavour? Seems to me that trackballs are great for crowded desktops (you know, the one with keyboards, notes, pens and coffee cups), and for laptops with those hated overly-sensitive touchpads. But right now, it seems to be a choice between that Logitech Trackman and some Kensington models that lack scroll wheels. All I want is a nice big ball to manipulate with the fingers and two buttons on the thumb side with the scroil wheel between them. Placement of other buttons is completely optional. Is that asking too much?

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  • Cheap desktop computer in 19" rack-mountable form-factor?

    - by Alex Basson
    I'm a high school teacher at a small private school. As of this year, we have SMARTBoards in every classroom (though I've had one in the class I share for two years now). The classrooms themselves don't have computers in them, so we teachers bring our laptops to class and connect them to the boards. This has several disadvantages: This takes a few minutes while we wait for the board to boot up and then orient the board to our individual laptop -- we have to do this every time b/c different teachers have different laptops requiring different orientations. This isn't ideal because when you only have 43 minutes per class period, waiting five minutes just to get started is a real waste. Carrying your laptop to class doesn't sound so bad until you consider that we're also carrying textbooks and piles of student papers, and we're carrying it all through crowded high school hallways. More than one laptop has fallen THUNK to the floor, with dire consequences. We feel we could eliminate the need to use our laptops with the SMARTBoards if we had a dedicated computer in each classroom hooked up to the board at all times. Each board set-up is connected to a podium with a standard 19" rack in it, currently housing a power supply and DVD player. There're plenty of rack spaces available. So I'm thinking: maybe we could get some inexpensive computers in a 19" rack-mountable form factor, install them in the podiums, and connect them to the boards on a permanent basis. Any suggestions?

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  • KVM virtual machine unable to access internet

    - by peachykeen
    I have KVM set up to run a virtual machine (Windows Home Server 2011 acting as a build agent) on a dedicated server (CentOS 6.3). Recently, I ran updates on the host, and the virtual machine is now unable to connect to the internet. The virtual network is running through NAT, the host has an interface (eth0:0) set up with a static IP (virt-manager shows the network and its IP correctly), and all connections to that IP should be sent to the guest. The host and guest can ping one another, but the guest cannot ping anything above the host, nor can I ping the guest from anywhere else (I can ping the host). Results from the guest to another server under my control and from an external system to the guest both return "Destination port unreachable". Running tcpdump on the host and destination shows the host replying to the ping, but the destination never sees it (it doesn't even look like the host is bothering to send it on at all, which leads me to suspect iptables). The ping output matches that, listing replies from 192.168.100.1. The guest can resolve DNS, however, which I find rather odd. The guest's network settings (connection TCP/IPv4 properties) are set up with a static local IP (192.168.100.128), mask of 255.255.255.0, and gateway and DNS at 192.168.100.1. When originally setting up the vm/net, I had set up some iptables rules to enable bridging, but after my hosting company complained about the bridge, I set up a new virtual net using NAT and believe I removed all the rules. The VM's network was working perfectly fine for the last few months, until yesterday. I haven't heard anything from the hosting company, didn't change anything on the guest, so as far as I know, nothing else has changed (unfortunately the list of packages updated has since fallen off scrollback and I didn't note it down).

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  • Disable all the idiot-checking in Mac OS X

    - by Fake Name
    I am a Windows/Linux user, who is learning Mac OS X out of interest in doing dev-work for the iPad which I recently purchased. However, OS X is driving me nuts by trying to protect all it's system files, hiding all of the important OS components I want to tweak, and generally making it impossible to do any modification to the OS in general to make it more usable. Therefore, is there a way to turn off all the idiot-checking in Finder? On XP, I can disable "Hide Protected Operating system files" and set "Show Hidden Files". On linux, there really aren't many hidden files, and changing the configuration for .files is easy enough in Gnome and XFCE. How can I set up OS X in a similar way. I am not new to computers, and I am fully aware that deleting system files can damage or even irreparably disable a OS install. Therefore, If I intentionally try to delete a file, or move something, it's probably intentional, and I am willing to accept the consequences in any case. At this point, I have fallen back to doing everything through the command line (which takes forever), because Finder is practically unusable. (As for what I am attempting to do, I also asked about GUI changes here.)

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  • Stuck due to "knowing too much"

    - by Ran Biron
    Note more discussion at http://news.ycombinator.com/item?id=4037794 Welcome Hacker News Visitors! While HN is a fine forum for discussion and debate, Programmers - Stack Exchange is not. From the FAQ: If your motivation for asking the question is “I would like to participate in a discussion about ____”, then you should not be asking here. However, if your motivation is “I would like others to explain ____ to me”, then you are probably OK. (Discussions are of course welcome in our real time web chat.) Currently, this question is viewed by the membership of Programmers.SE as more likely to provoke unproductive discussion than constructive answers; while debates on its form and future are conducted, it will be locked to prevent arguments and vandalism. -- Shog9 I have a relatively simple development task, but every time I try to attack it, I end up spiraling in deep thoughts - how could it extending the future, what are the 2nd generation clients going to need, how does it affect "non functional" aspects (e.g. Performance, authorization...), how would it best be architectured to allow change... I remember myself a while ago, younger and, perhaps, more eager. The "me" I was then wouldn't have given a thought about all that - he would've gone ahead and wrote something, then rewrote it, then rewrote it again (and again...). The "me" today is more hesitant, more careful. I find it much easier today to sit and plan and instruct other people on how to do things than to actually go ahead and do them myself - not because I don't like to code - the opposite, I love to! - but because every time I sit at the keyboard, I end up in that same annoying place. Is this wrong? Is this a natural evolution, or did I drive myself into a rut? Fair disclosure - in the past I was a developer, today my job title is a "system architect". Good luck figuring what it means - but that's the title. Wow. I honestly didn't expect this question to generate that many responses. I'll try to sum it up. Reasons: Analysis paralysis / Over engineering / gold plating / (any other "too much thinking up-front can hurt you"). Too much experience for the given task. Not focusing on what's important. Not enough experience (and realizing that). Solutions (not matched to reasons): Testing first. Start coding (+ for fun) One to throw away (+ one API to throw away). Set time constraints. Strip away the fluff, stay with the stuff. Make flexible code (kinda opposite to "one to throw away", no?). Thanks to everyone - I think the major benefit here was to realize that I'm not alone in this experience. I have, actually, already started coding and some of the too-big things have fallen off, naturally. Since this question is closed, I'll accept the answer with most votes as of today. When/if it changes - I'll try to follow.

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  • Are there too many qualified software development engineers chasing too few jobs?

    - by T Gregory
    I am trying to write this question in a non-argumentative way, but it is quite emotionally charged for some, so please bear with me. In the U.S., we hear constantly from CEOs that they cannot find enough qualified software engineers. In fact, it is the position of the U.S. government that demand for software engineering talent outpaces supply. This position can be clearly seen in the granting of tens of thousands of H1B visas, but also in the following excerpt from the official 2010-11 Bureau of Labor Statistics Occupational Outlook Handbook: Employment of computer software engineers is expected to increase by 32 percent from 2008-2018, which is much faster than the average for all occupations. In addition, this occupation will see a large number of new jobs, with more than 295,000 created between 2008 and 2018. Demand for computer software engineers will increase as computer networking continues to grow. For example, expanding Internet technologies have spurred demand for computer software engineers who can develop Internet, intranet, and World Wide Web applications. Likewise, electronic data-processing systems in business, telecommunications, healthcare, government, and other settings continue to become more sophisticated and complex. Implementing, safeguarding, and updating computer systems and resolving problems will fuel the demand for growing numbers of systems software engineers. New growth areas will also continue to arise from rapidly evolving technologies. The increasing uses of the Internet, the proliferation of Web sites, and mobile technology such as the wireless Internet have created a demand for a wide variety of new products. As more software is offered over the Internet, and as businesses demand customized software to meet their specific needs, applications and systems software engineers will be needed in greater numbers. In addition, the growing use of handheld computers will create demand for new mobile applications and software systems. As these devices become a larger part of the business environment, it will be necessary to integrate current computer systems with this new, more mobile technology. However, from the the employee side of the equation, we often hear the opposite. Many of the stories of SDEs with graduate degrees and decades of experience on the unemployment line, or the big tech interview war stories, are anecdotal, for sure. But, there is one piece of data that is neither anecdotal nor transitory, and that is the aggregate decisions of millions of undergraduates of what degree to pursue. Here, a different picture emerges from the data, and that picture is not good for the software profession. According the most recent Taulbee Survey from Computer Research Association, undergrad degree production in CS and CE has fallen nearly 60% since 2004. (Undergrad enrollments have ticked up in the past two years, but only modestly). Here we see that a basic disconnect between what corporate CEOs and the US government are saying and what potential employees really think about job prospects in software engineering. So my questions are these. Who are we to believe? Is there an acute talent shortage, or is there a long-term structural oversupply in the SDE labor market? Can anyone provide reliable data on long-term unemployment among SDEs? How many are leaving the profession due to lack of work? Real data is most helpful. Thanks.

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  • Sneak Peak: Social Developer Program at JavaOne

    - by Mike Stiles
    By guest blogger Roland Smart We're just days away from what is gunning to be the most exciting installment of OpenWorld to date, so how about an exciting sneak peak at the very first Social Developer Program? If your first thought is, "What's a social developer?" you're not alone. It’s an emerging term and one we think will gain prominence as social experiences become more prevalent in enterprise applications. For those who keep an eye on the ever-evolving Facebook platform, you'll recall that they recently rebranded their PDC (preferred developer consultant) group as the PMD (preferred marketing developer), signaling the importance of development resources inside the marketing organization to unlock the potential of social. The marketing developer they're referring to could be considered a social developer in a broader context. While it's true social has really blossomed in the marketing context and CMOs are winning more and more technical resources, social is starting to work its way more deeply into the enterprise with the help of developers that work outside marketing. Developers, like the rest of us, have fallen in "like" with social functionality and are starting to imagine how social can transform enterprise applications in the way it has consumer-facing experiences. The thesis of my presentation is that social developers will take many pages from the marketing playbook as they apply social inside the enterprise. To support this argument, lets walk through a range of enterprise applications and explore how consumer-facing social experiences might be interpreted in this context. Here's one example of how a social experience could be integrated into a sales enablement application. As a marketer, I spend a great deal of time collaborating with my sales colleagues, so I have good insight into their working process. While at Involver, we grew our sales team quickly, and it became evident some of our processes broke with scale. For example, we used to have weekly team meetings at which we'd discuss what was working and what wasn't from a messaging perspective. One aspect of these sessions focused on "objections" and "responses," where the salespeople would walk through common objections to purchasing and share appropriate responses. We tried to map each context to best answers and we'd capture these on a wiki page. As our team grew, however, participation at scale just wasn't tenable, and our wiki pages quickly lost their freshness. Imagine giving salespeople a place where they could submit common objections and responses for their colleagues to see, sort, comment on, and vote on. What you'd get is an up-to-date and relevant repository of information. And, if you supported an application like this with a social graph, it would be possible to make good recommendations to individual sales people about the objections they'd likely hear based on vertical, product, region or other graph data. Taking it even further, you could build in a badging/game element to reward those salespeople who participate the most. Both these examples are based on proven models at work inside consumer-facing applications. If you want to learn about how HR, Operations, Product Development and Customer Support can leverage social experiences, you’re welcome to join us at JavaOne or join our Social Developer Community to find some of the presentations after OpenWorld.

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  • Is This a Valid Way to Use Blocks in Objective-C?

    - by Carter
    I've been building a HTTP client that uses web services to synchronize information between the client and server. I've been using Blocks and NSURLConnection to achieve this on the client side, but I'm getting frequent EXC_BAD_ACCESS crashes in objc_msgSend(). From what I understand, this usually means that a stored block that has fallen off the stack has been called. I think I've coded things correctly to avoid this, but I'm still stuck. Here is conceptually what my code is doing. It starts by calling "synchronizeWithWebServer". That method invokes "listRootObjectsOnServerWithBlock:" which takes in a block to be called when the method returns. "listRootObjectsOnServersWithBlock:" initiates a NSURLConnection to the web server asynchronously. It to expects a block to be called when it returns. Inside that block I want to be able to execute the original Block (so aptly named 'block'). This is only a simplified version of my code. The real synchronization process is more complex but it's mostly more of the same as what you see below. Sometimes the code works perfectly, but about 80% of the time it crashes very early on in the routine. It seems to be more vulnerable to crashing when my data set gets larger. - (void)synchronizeWithWebServer { [self listRootObjectsOnServerWithBlock:^(NSArray *results, NSError *error) { //Iterate over result objects and perform some other similar routines. }]; } - (void)listRootObjectsOnServerWithBlock:(void (^)(NSArray *results, NSError *error))block { //Create NSURLRequest Here //Create connection asynchronously. block = [block copy]; [NSURLConnection sendAsynchronousRequest:urlRequest queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){ //Parse response from web server (stored in NSData *data) NSArray *results = ..... //Call 'block' block(results, error); [block release]; }]; }

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  • Probably an easy one - PHP/CodeIgniter 'Undefined Variable'

    - by Jack W-H
    Morning y'all This is probably an easy one but I barely got any sleep last night and am struggling to comprehend anything. I've got a CodeIgniter library I've made called Points.php. Here's the contents of Points: <?php if (!defined('BASEPATH')) exit('No direct script access allowed'); class Points { function __construct() { $this->ci =& get_instance(); $this->ci->load->database(); } function getpoints($params) { echo $userid; } } /* End of file Points.php */ /* Location: ./application/libraries/Points.php */ ?> As you can see, I'm building it up slowly and it's being kept simple. In one of my views, I want it to display the number of 'points' (which for the time being is simply the third segment of the URI). I call it like this: <p>Points: <?php $params['user_id']=$this->uri->segment(3,1); echo $this->points->getpoints($params); ?></p> The warning I get back in the view is this: A PHP Error was encountered Severity: Notice Message: Undefined variable: userid Filename: libraries/Points.php Yes I know it's such a simple problem but I've tried lots of things. Some variations include echoing in Points.php $params['userid']; etc. But I don't see what I'm doing wrong? This is my first CodeIgniter class and I've fallen at the first step, haha...

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  • Bash and regex problem : check for tokens entered into a Coke vending machine

    - by Michael Mao
    Hi all: Here is a "challenge question" I've got from Linux system programming lecture. Any of the following strings will give you a Coke if you kick: L = { aaaa, aab, aba, baa, bb, aaaa"a", aaaa"b", aab"a", … ab"b"a, ba"b"a, ab"bbbbbb"a, ... } The letters shown in wrapped double quotes indicate coins that would have fallen through (but those strings are still part of the language in this example). Exercise (a bit hard) show this is the language of a regular expression And this is what I've got so far : #!/usr/bin/bash echo "A bottle of Coke costs you 40 cents" echo -e "Please enter tokens (a = 10 cents, b = 20 cents) in a sequence like 'abba' :\c" read tokens #if [ $tokens = aaaa ]||[ $tokens = aab ]||[ $tokens = bb ] #then # echo "Good! now a coke is yours!" #else echo "Thanks for your money, byebye!" if [[ $token =~ 'aaaa|aab|bb' ]] then echo "Good! now a coke is yours!" else echo "Thanks for your money, byebye!" fi Sadly it doesn't work... always outputs "Thanks for your money, byebye!" I believe something is wrong with syntax... We didn't provided with any good reference book and the only instruction from the professor was to consult "anything you find useful online" and "research the problem yourself" :( I know how could I do it in any programming language such as Java, but get it done with bash script + regex seems not "a bit hard" but in fact "too hard" for anyone with little knowledge on something advanced as "lookahead"(is this the terminology ?) I don't know if there is a way to express the following concept in the language of regex: Valid entry would consist of exactly one of the three components : aaaa, aab and bb, regardless of order, followed by an arbitrary sequence of a or b's So this is what is should be like : (a{4}Ua{2}bUb{2})(aUb)* where the content in first braces is order irrelevant. Thanks a lot in advance for any hints and/or tips :)

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