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  • Rails: The Law of Demeter [duplicate]

    - by user2158382
    This question already has an answer here: Rails: Law of Demeter Confusion 4 answers I am reading a book called Rails AntiPatterns and they talk about using delegation to to avoid breaking the Law of Demeter. Here is their prime example: They believe that calling something like this in the controller is bad (and I agree) @street = @invoice.customer.address.street Their proposed solution is to do the following: class Customer has_one :address belongs_to :invoice def street address.street end end class Invoice has_one :customer def customer_street customer.street end end @street = @invoice.customer_street They are stating that since you only use one dot, you are not breaking the Law of Demeter here. I think this is incorrect, because you are still going through customer to go through address to get the invoice's street. I primarily got this idea from a blog post I read: http://www.dan-manges.com/blog/37 In the blog post the prime example is class Wallet attr_accessor :cash end class Customer has_one :wallet # attribute delegation def cash @wallet.cash end end class Paperboy def collect_money(customer, due_amount) if customer.cash < due_ammount raise InsufficientFundsError else customer.cash -= due_amount @collected_amount += due_amount end end end The blog post states that although there is only one dot customer.cash instead of customer.wallet.cash, this code still violates the Law of Demeter. Now in the Paperboy collect_money method, we don't have two dots, we just have one in "customer.cash". Has this delegation solved our problem? Not at all. If we look at the behavior, a paperboy is still reaching directly into a customer's wallet to get cash out. EDIT I completely understand and agree that this is still a violation and I need to create a method in Wallet called withdraw that handles the payment for me and that I should call that method inside the Customer class. What I don't get is that according to this process, my first example still violates the Law of Demeter because Invoice is still reaching directly into Customer to get the street. Can somebody help me clear the confusion. I have been searching for the past 2 days trying to let this topic sink in, but it is still confusing.

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  • Dual-Boot Problem

    - by user171379
    I have a HP laptop that originally had Windows 7 OS on it, I partioned the drive and allocated 100gb (est.) for the ubuntu install. the install went fine i have ubuntu and windows 7 still on the computer. But I can not get the OS boot screen to show ubuntu as an OS. I can while start up pull up the start menu screen via ESC. Key and press F9 for Boot Device Options and get the boot manager screen and it lists... OS boot manager, Ubuntu (Hitachi HTS 543232A7A384), boot from EFI file, and Notebook Hard Drive... I can boot Ubuntu from this screen by selecting Ubuntu. But i would like to make it easier to access. The computer boot is not for myself otherwise it would not be a problem i would remove windows altogether. I would like to make it basically "User Friendly" if that's at all possible and make the OS boot screen show Ubuntu as a bootable OS as well as Windows 7. on the boot selection screen. Any help on this issue would be greatly appreciated, I've looked to see if i could find the answer and maybe i've overlooked something so here I am. Like i said i need it to be as user friendly as possible and force the user to choose windows 7 or ubuntu not send them into one or the other without them being allowed to choose. I can get any information you might need if necessary but i dont know exactly what you'll need other than what i've given. Ubuntu version is the 13.04 just so you know.

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  • Are short abbreviated method/function names that don't use full words bad practice or a matter of style?

    - by Alb
    Is there nowadays any case for brevity over clarity with method names? Tonight I came across the Python method repr() which seems like a bad name for a method to me. It's not an English word. It apparently is an abbreviation of 'representation' and even if you can deduce that, it still doesn't tell you what the method does. A good method name is subjective to a certain degree, but I had assumed that modern best practices agreed that names should be at least full words and descriptive enough to reveal enough about the method that you would easily find one when looking for it. Method names made from words help let your code read like English. repr() seems to have no advantages as a name other than being short and IDE auto-complete makes this a non-issue. An additional reason given in an answer is that python names are brief so that you can do many things on one line. Surely the better way is to just extract the many things to their own function, and repeat until lines are not too long. Are these just a hangover from the unix way of doing things? Commands with names like ls, rm, ps and du (if you could call those names) were hard to find and hard to remember. I know that the everyday usage of commands such as these is different than methods in code so the matter of whether those are bad names is a different matter.

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  • Does LINQ require significantly more processing cycles and memory than lower-level data iteration techniques?

    - by Matthew Patrick Cashatt
    Background I am recently in the process of enduring grueling tech interviews for positions that use the .NET stack, some of which include silly questions like this one, and some questions that are more valid. I recently came across an issue that may be valid but I want to check with the community here to be sure. When asked by an interviewer how I would count the frequency of words in a text document and rank the results, I answered that I would Use a stream object put the text file in memory as a string. Split the string into an array on spaces while ignoring punctuation. Use LINQ against the array to .GroupBy() and .Count(), then OrderBy() said count. I got this answer wrong for two reasons: Streaming an entire text file into memory could be disasterous. What if it was an entire encyclopedia? Instead I should stream one block at a time and begin building a hash table. LINQ is too expensive and requires too many processing cycles. I should have built a hash table instead and, for each iteration, only added a word to the hash table if it didn't otherwise exist and then increment it's count. The first reason seems, well, reasonable. But the second gives me more pause. I thought that one of the selling points of LINQ is that it simply abstracts away lower-level operations like hash tables but that, under the veil, it is still the same implementation. Question Aside from a few additional processing cycles to call any abstracted methods, does LINQ require significantly more processing cycles to accomplish a given data iteration task than a lower-level task (such as building a hash table) would?

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  • Oracle OpenWorld 2012 Hands-on Lab: “Leading Your Everyday Application Integration Projects with Enterprise SOA”

    - by Lionel Dubreuil
    Sharpen your Oracle skill sets and master Oracle technology in Oracle OpenWorld Hands-on Labs.In self-paced, practical learning sessions covering everything from business applications to middleware, database, storage, and enterprise management solutions, you'll discover new ways to derive maximum benefits from your Oracle hardware and software solutionsOracle experts will be available in person to answer questions and guide you through each lab.Hands-on Labs fill up early, and seats are limited, so don’t be late.This  HOL10093 - Leading Your Everyday Application Integration Projects with Enterprise SOA is scheduled for: Date: Monday, Oct 1 Time: 10:45 AM - 11:45 AM Location: Marriott Marquis - Salon 5/6 In this Hands-on Lab, Experience firsthand how Oracle Enterprise Repository, Oracle Application Integration Architecture (AIA) Foundation Pack, and Oracle SOA Suite work together to help you drive your enterprisewide integration projects.From asset management, discovery, and management in Oracle Enterprise Repository to integration of content in Oracle AIA Foundation Pack operating on the Oracle SOA Suite platform, discover how you can develop integrations to support business agility.Take advantage of Oracle-delivered integration assets and validate your services for compliance, within Oracle JDeveloper. You will get your hands on the tools and talk with Oracle experts in this hands-on lab.Objectives for this session are to: Use Oracle Enterprise Repository to manage application interfaces, composite applications, and business processes See how Oracle Enterprise Repository can benefit every service-based application integration project Learn how to govern services through the software lifecycle and validate your services for compliance

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  • Oracle OpenWorld 2012 Hands-on Lab: “Leading Your Everyday Application Integration Projects with Enterprise SOA”

    - by Lionel Dubreuil
    Sharpen your Oracle skill sets and master Oracle technology in Oracle OpenWorld Hands-on Labs.In self-paced, practical learning sessions covering everything from business applications to middleware, database, storage, and enterprise management solutions, you'll discover new ways to derive maximum benefits from your Oracle hardware and software solutionsOracle experts will be available in person to answer questions and guide you through each lab.Hands-on Labs fill up early, and seats are limited, so don’t be late.This  HOL10093 - Leading Your Everyday Application Integration Projects with Enterprise SOA is scheduled for: Date: Monday, Oct 1 Time: 10:45 AM - 11:45 AM Location: Marriott Marquis - Salon 5/6 In this Hands-on Lab, Experience firsthand how Oracle Enterprise Repository, Oracle Application Integration Architecture (AIA) Foundation Pack, and Oracle SOA Suite work together to help you drive your enterprisewide integration projects.From asset management, discovery, and management in Oracle Enterprise Repository to integration of content in Oracle AIA Foundation Pack operating on the Oracle SOA Suite platform, discover how you can develop integrations to support business agility.Take advantage of Oracle-delivered integration assets and validate your services for compliance, within Oracle JDeveloper. You will get your hands on the tools and talk with Oracle experts in this hands-on lab.Objectives for this session are to: Use Oracle Enterprise Repository to manage application interfaces, composite applications, and business processes See how Oracle Enterprise Repository can benefit every service-based application integration project Learn how to govern services through the software lifecycle and validate your services for compliance

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  • Adding files and folders to a Root Folder (inode/directory)

    - by xBaldwin
    Ok so I'm fairly new to Ubuntu and wasn't even the one who put it one this computer(my friend did while I was storing it at his house because I was in the middle of transitioning between houses), but It's on here so I need to learn what I can so I can use it more effectively. My question at the moment is "Would it be safe to add files/folders to a folder (inode/directory) that requires Root access?" I continue to be informed by the system that the directory I am using is running low on space which I found odd seeing how I should have a lot more room on this computer. That's when I started looking at the directories and found that there are two with a bunch of un-used space on them. One says it has 46.9 GB of free space and the other has 24.9 GB of free space. Seems like a complete waste to not use that space and yet they both say they require Root access to add to them. I know that Root folders and files are normally all system folders and files. I also know that changing or deleting them can mess up the computer which right now I cant afford to do. I just don't know if it would mess anything up to add something to those folders. Thank you in advance to anyone who takes the time to reply and try to teach me about how all that works. I really do appreciate it and will do the same if by some crazy (completely unlikely) reason I have an answer to your question. :-)`

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  • How to boot from toshiba recovery partition after installing ubuntu 14.04.1? [duplicate]

    - by Hunter Dotson
    This question already has an answer here: How to remove Ubuntu and put Windows back on? 14 answers Im new here and have not found a post even close to this so here it is: i installed ubuntu 14.04.1 over my Windows 7 Home Premium installation. didn't loose any important data.skip to when the install is done i tried out ubuntu and got sick of it after a while.(the try ubuntu option was greyed out) i got sick of ubuntu after about an hour and i tried to boot into my recovery partition. That's where im running into trouble: you are supposed to hold down the numerical "0" while turning on the power. but it just proceeds to load grub/ubuntu and does not even try to boot into the recovery partition. "000000000000" is all i get from holding it down I know the recovery partition is intact,but i cant access it,even when setting a boot flag on it. i am stumped and i really need answers thanks in advance! specs Toshiba satellite l775 intel core i3 dual core processor original os:windows 7 home premium 64 bit sp1 let me know if you need more info!

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  • Installing 10.04 server on HP xw9400 Workstation with RAID 5

    - by Dave Long
    I have a workstation that was given to me that is a friggen powerhouse, so I figured I would set it up as my development and demo server. This is my first experience installing Ubuntu onto a RAID array and so far it has not been a fun one. I have been following the Advanced Installation guide for installing Ubuntu 10.04 server, and it says that there will be an option on the Partition Disks screen to manually create the partitions, but the only options I have are: Configure iSCSI volumes Undo changes to partitions Finish partitioning and write changes to disk Just before I got to that screen I got a message that said: One or more drives containing Serial ATA RAID configurations have been found. Do you wish to activate these RAID devices? It doesn't matter whether I answer yes or no to that, I still get the same Partition Disks screen. When I try to select Finish partitioning and write changes to disk I just get the No root file system error. Has anyone else experienced this, and how do I get past it? Can I not run Ubuntu on this machine?

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  • Architecture of a "website generator" web application

    - by Resorath
    What is the most maintainable and efficient way to architect a web application who's purpose is to host and generate websites which can be customized to a certain degree? There are a lot of these style of applications in the wild that generate all kinds of sites, from sites that host World of Warcraft guilds like guildlaunch to other sites like my wedding for wedding site hosting. My question is, what is the basic architecture that these sites operate on? I imagine there are two ways of thinking about this. A central set of code that all sites on the host run against, and it acts differently based on which site was visited. In this manner, when the base code is updated all sites are updated simultaneously. Or, the code for an individual site exists in a silo, and is simply replicated to a new directory each time a site is created. When an update needs to be applied, the code is pushed out to each site silo. In my case, I am working in PHP with the CodeIgniter framework, however the answer need not be limited to this case. Which method (if any) creates a more maintainable and efficient architecture to manage this style of web application?

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  • How can I get the best performance for playing games?

    - by Oli
    I've been playing a couple of Wine-games today and decided to switch to metacity to see what the performance difference was like. If you've never done it before, you just run metacity --replace but don't do that if you use Unity! Anyway, surprise surprise it was like playing on a dedicated Windows gaming machine. Playing under metacity today was bliss. Much higher framerates and just a fluidity that you'd expect from a native game. I'm not sure I can go back. Switching to metacity is no hardship but I wonder if there's anything else in the WM landscape that I should try out. I'm essentially looking for suggestions for the best way to play games. Mix up WMs, dedicated X sessions, whatever... As long as it makes Wine games run faster. Small print One process per answer (eg: New X session + OpenBox) We should probably land on a benchmark so we can show percentage improvement over a stock Compiz desktop. I'm open to suggestions in the comments. If people could test it and submit their how much it improves things for them in the comments, that would give others a good idea of if it's worth the pain.

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  • Thoughts on Technical Opinions

    - by Joe Mayo
    Nearly every day, people send email from the C# Station contact form with feedback on the tutorial.  The overwhelming majority is positive and “Thank You” notes.  Some feedback identifies problems such as typos, grammatical errors, or a constructive explanation of an item that was confusing.  It’s pretty rare, but I even get emails that are not very nice at all – no big deal because it comes with the territory and is sometimes humorous.  Sometimes I get questions related to the content that is more of a general nature, referring to best practices or approaches. It’s these more general questions that are sometimes interesting because there’s often no right or wrong answer. There was a time when I was more opinionated about these general scenarios, but not so much anymore. Sure, people who are learning are wanting to know the “right” way to do something and general guidance is good to help them get started.  However, just because a certain practice is the way you or your clique does things, doesn’t mean that another approach is wrong.  These days, I think that a more open-minded approach when providing technical guidance is more constructive. By the way, to all the people who consistently send kind emails each day:  You’re very welcome. :) @JoeMayo

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  • Can org.freedesktop.Notifications.CloseNotification(uint id) be triggered and invoked via DBus?

    - by george rowell
    ref: Close button on notify-osd? Bookmark: Can org.freedesktop.Notifications.CloseNotification(uint id) be triggered and invoked via DBus? Currently, this script dbus-monitor "interface='org.freedesktop.Notifications'" | \ grep --line-buffered "member=Notify" | \ sed -u -e 's/.*/killall notify-osd/g' | \ bash will kill all pending notifications. It would be better to finesse the specific target OSD notification to cancel, by using org.freedesktop.Notifications.CloseNotification(uint id). Is there an interface method that can put this on (in?) the DBus to fire when a particular notify event occurs? The method will need to get the notify PID to use as the argument for CloseNotification(uint id). Alternatively, qdbus org.freedesktop.Notifications \ /org/freedesktop/Notifications \ org.freedesktop.Notifications.CloseNotification(uint id) could be used from the shell, if the (uint id) argument could be determined. The actual command syntax would use an integer in place of (uint id). Perhaps a better question to ask first might be "How is the DBus address for a notification found?". In hindsight the previous question "How is the (uint id) for a notification found?" is rhetorical! This previous answer: http://askubuntu.com/a/186311/89468 provided details so either method below can be used: gdbus call --session --dest org.freedesktop.DBus \ --object-path / \ --method org.freedesktop.DBus.GetConnectionUnixProcessID :1.16 returning: (uint32 8957,) or qdbus --literal --session org.freedesktop.DBus / \ org.freedesktop.DBus.GetConnectionUnixProcessID :1.16 returning: 8957

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  • In what fields do programming and Business Sciences intersect? [on hold]

    - by Alainus
    One note of clarification: I'm getting a lot of comments saying that this question is too personal, too relative, subjective, and that career-path questions get quickly deleted. This is not a question about me or my career. This question is just what the title says: What fields exist that converge programming and business. Now the question: I read this answer regarding off-topic questions, and I was afraid this might be, so I'll try to keep it general and helpful for others. Also, this one has a similar background but formulates a different question from it. I have a Business Administration degree, but I've programmed since I can remember, and it's been my only job for years. However, my problem is the same that the majority of "amateuressional" programmers have: - Incomplete knowledge of the fundamentals. - Anxiety to keep up. - Feeling of not making anything useful of "the other degree". - Afraid of finally becoming a jack of all trades (master of none). Which further studies (specific degrees or fields) exist that allow a person with a BS degree converge into a programming career, without having to sacrifice coding, allowing to further expand the knowledge of C.S. fundamentals, and also without completely sacrificing the first?

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  • Will you choose JavaFX for Development?

    - by javafx4you
    A few weeks ago, a poll on the home page of java.net caught my eyes, because it was related to JavaFX. Its title: Will you use JavaFX for development once it's fully ported to Mac and Linux platforms? Usually, the results for this type of polls are published on the editor's Daily Blog soon after the poll closes. For some reason, this didn't happen for the JavaFX poll, so I'll take a shot at interpreting the results.  The results found on java.net look pretty close to the following: Although this way to look at the results already gives us an idea of how much traction JavaFX is getting, there are just too many type of answers that make it hard to read. The answers "maybe" and "I don't know" are awfully similar, so I'm tempted to collapse these together. Then there is "No, I don't do that type of development" that just doesn't belong here, as obviously developers who ave chosen this answer don't develop Rich Internet Apps, and therefore I will adapt the % results accordingly. Finally, I've been tempted to combine the top three categories just t simplify the results. This gives me the following chart:  Whether you prefer the original graph, or my simplified take on it, one thing is sure:  less than 10% of developers who have taken this poll plan to stick to another toolkit (presumably Swing or SWT), while the vast majority is inclined to use JavaFX. When you take into account that JavaFX 2.0 is pretty much a "new" API (no more JavaFX Script), I think these are some pretty good results, 6 months after the official release of JavaFX 2.0.

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  • What are the most necessary non-language specific things a programmer needs to know?

    - by Josh
    I've been thinking about this a lot lately. Right now I work at a little web company, am almost done with school, and have written an iPhone app, but I'm not sure what else I need to focus my learning energies on. I've decided I want to do software programming, so I've been actively reading everything I can get my hands on that deals with Objective-C / C++ (Cocoa, OpenGL, etc). But those are not the things I'm talking about. I know I need to "master" a language or two. What I'm talking about are the other "things". Things such as learning and using source control, design patterns, etc. What thing (or things, just one per response), would you say I should concurrently be focusing on? You can consider in your answer that I'm wanting to do the aforementioned career path, but you don't have to. I just want a nice list of things to research, and actually use in my career. Also, can someone help me with tagging this? I'm not sure what exactly would be a good tag for such a question.

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  • Name of the Countdown Numbers round problem - and algorithmic solutions?

    - by Dai
    For the non-Brits in the audience, there's a segment of a daytime game-show where contestants have a set of 6 numbers and a randomly generated target number. They have to reach the target number using any (but not necessarily all) of the 6 numbers using only arithmetic operators. All calculations must result in positive integers. An example: Youtube: Countdown - The Most Extraordinary Numbers Game Ever? A detailed description is given on Wikipedia: Countdown (Game Show) For example: The contentant selects 6 numbers - two large (possibilities include 25, 50, 75, 100) and four small (numbers 1 .. 10, each included twice in the pool). The numbers picked are 75, 50, 2, 3, 8, 7 are given with a target number of 812. One attempt is (75 + 50 - 8) * 7 - (3 * 2) = 813 (This scores 7 points for a solution within 5 of the target) An exact answer would be (50 + 8) * 7 * 2 = 812 (This would have scored 10 points exactly matching the target). Obviously this problem has existed before the advent of TV, but the Wikipedia article doesn't give it a name. I've also saw this game at a primary school I attended where the game was called "Crypto" as an inter-class competition - but searching for it now reveals nothing. I took part in it a few times and my dad wrote an Excel spreadsheet that attempted to brute-force the problem, I don't remember how it worked (only that it didn't work, what with Excel's 65535 row limit), but surely there must be an algorithmic solution for the problem. Maybe there's a solution that works the way human cognition does (e.g. in-parallel to find numbers 'close enough', then taking candidates and performing 'smaller' operations).

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  • How to cut the line between quality and time?

    - by m3th0dman
    On one hand, I have been taught by various software engineering books ([1] as example) that my job as a programmer is to make the best possible software: great design, flexibility, to be easily maintained etc. One the other hand although I realize that I actually write software for money and not for entertainment, although is very nice to write good code and plan ahead and refactor after writing and ... I wonder if it is always best for the business (after all we should be responsible). Is the business always benefiting from a best code? Maybe I'm over-engineering something, and it's not always useful? So how should I know when to stop in the process to achieving the best possible code? I am sure that experience is something that makes a difference here, but I believe this cannot be the only answer. [1] Uncle Bob's in Clean Code says at page 6 about the fact that: They [managers] may defend the schedule and requirements with passion; but that’s their job. It’s your job to defend the code with equal passion.

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  • 301 redirect: Is this good or bad for 2 domains?

    - by Tim
    Since i couldn't find any appropriate answer to my specific question, I wanted to ask you. I've read alot of things about the 301-redirect for moving pages and so on. A customer of mine has booked a new domain last year for better search results (he included his main keyword into the domain. Before he had only a domain with his business name, which had nothing to say about what he does). I told him, that he should do a 301-redirect so he doesn't loose his position in Google and to redirect all new customers coming from the old domain to the new domain. After about one year where his site hat a good amount of traffic the search results of Google for his keywords are getting more worse. Since he didn't maintain his website (no new content, bad content on all pages and so on) I assumed this would be the problem. He gave his website to another company which also makes websites. They told him, that this 301-redirection is very bad for his website. They removed it, and also updated his content and the template so now he has the same meta keywords on every page (instead of the specific ones I put there before). He also removed the canonical-tag which I placed there to ensure no duplicate content. What I am now afraid of is, that without this redirect Google now will find duplicate content and therefore kick him out of the index, which would be a nightmare, since most of his customers come over his website. I need verification of the fact, that the 301 isn't bad but in fact the correct way of working with 2 domains. If possible with good sources I can point out to him since he don't wants to hear anything about this. If someone also has a few words about the keywords and the canonical-tag I would really appreciate it! Thank you very much!

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  • Interesting Blog Stats&ndash;What Sells

    - by Tim Murphy
    Just out of curiosity I decided to find out what the most frequently post were on my blog.  I knew what number one would be just from checking daily stats from time to time.  The main theme that I found in the data is that either pain or humor can really bring people to find your posts.  My most viewed post is on turning off Toshiba Flashcards at over 54K views (I think Toshiba should take notice of this massive fail).  The second highest is on Interesting Blog titles.  This was nothing more than a post that I had put up on a whim of humorous blog titles I had run across.  This post earned over 26K views.  Going down from there the theme stays the same either people looking for something humorous or people with a problem that you have an answer for are the posts that are most likely to get attention.  Remember that blogging can be a great service to your readers.  Keep it interesting and they will come. del.icio.us Tags: Blogging,Blog Topics,Blog Stats

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  • About C# objects and the possibilties it has

    - by user527825
    As a novice programmer and I always wonder about c# capabilities. I know it is still early to judge that but all i want to know is can c# do complex stuffs or something outside windows OS. I think C# is a proprietary language (I don't know if I said that right) meaning you can't do it outside Visual Studio or Windows. Also you can't create your own controller (called object right?) like you are forced to use these available in toolbox and their properties and methods. Can C# be used with OpenGL API or DirectX API Finally it always bothers me when I think I start doing things in Visual Studio, I know it sounds arrogant to say but sometimes I feel that I don't like to be forced to use something even if its helpful, like I feel (do I have the right to feel?) that I want to do all things by myself? Don't laugh I just feel that this will give me a better understanding. Is Visual C# like using MaxScript inside 3ds max in that C# is exclusive to do Windows and Forms and Components that are Windows related and maxscript is only for 3d editing and manipulation for various things in the software. If it is too difficult for a beginner I hope you don't answer the fourth question as I don't have enough motivation and I want to keep the little I have. Note: Sorry for my English, I am self taught and never used the language with native speakers so expect so errors. I have a lot of questions regarding many things, what is the daily ratio you think for asking (number of questions) that would not bother the admins of the site and the members here. Thank you for your time.

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  • Computer becomes unreachable on lan after some time

    - by Ashfame
    I work on my laptop and ssh into my desktop. I use a lot of key based authentication for many servers for work but recently I couldn't login because ssh would pick up and try all the keys and it stops trying before ultimately falling back to password based login. So right now I am using this command: ssh -X -o PubkeyAuthentication=no [email protected] #deskto The issue is after sometime the desktop would just become unreachable from laptop. I won't be able to open its localhost through IP and today I tried ping'in it and found a weird thing. Instead of 192.168.1.4, it tries to ping 192.168.1.3 which I am sure is the root cause as it just can't reach 192.168.1.4 when its actually trying for 192.168.1.3 Ping command output: ashfame@ashfame-xps:~$ ping 192.168.1.4 PING 192.168.1.4 (192.168.1.4) 56(84) bytes of data. From 192.168.1.3 icmp_seq=1 Destination Host Unreachable From 192.168.1.3 icmp_seq=2 Destination Host Unreachable From 192.168.1.3 icmp_seq=3 Destination Host Unreachable From 192.168.1.3 icmp_seq=4 Destination Host Unreachable From 192.168.1.3 icmp_seq=5 Destination Host Unreachable From 192.168.1.3 icmp_seq=6 Destination Host Unreachable From 192.168.1.3 icmp_seq=7 Destination Host Unreachable From 192.168.1.3 icmp_seq=8 Destination Host Unreachable From 192.168.1.3 icmp_seq=9 Destination Host Unreachable ^C --- 192.168.1.4 ping statistics --- 10 packets transmitted, 0 received, +9 errors, 100% packet loss, time 9047ms pipe 3 Also the ping command message comes in multiple and not one by one. (izx answer's the weirdness I thought there was in ping command.) I did check for desktop, its local IP is still the same, so something is going on in my laptop. Any ideas? P.S. - Laptop runs Ubuntu 12.04 & Desktop runs Ubuntu 11.10 Laptop is connected through wifi to router and Desktop is connected through LAN to router. Update: Even after setting up static IP leases in router settings, I again ran into this issue.

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  • C#.NET: How to update multiple .NET pages when a particular event occurs in one .Net page? In another words how to use Observer pattern(Publish and subscribe to events)

    Problem: Suppose you have a scenario in which you have to update multiple pages when an event occurs in main page. For example imagine you have a main page where you are dispalying a tab control. This tab control has 3 tab pages where you are loading 3 different user controls. On click of an update button in main page imagine if you have do something in all the 3 tab panels. In other words an event in main page has to be handled in many other pages. An event in main page which contains the tab control has to be handled in all the tab panels(user controls) Answer: Use Observer pattern Define a base page for the page that contains the tab control. Main page which contains the tab: Baseline_Baseline Basepage for the above main page: BaselineBasePage User control that has to be udpated for an event in main page: Baseline_PriorNonDeloitte Source Code: public class BaselineBasePage : System.Web.UI.Page { IList lstControls = new List(); public void Add(IObserver userControl) { lstControls.Add(userControl); } public void Remove(IObserver userControl) { lstControls.Remove(userControl); } public void RemoveAllUserControls() { lstControls.Clear(); } public void Update(SaveEventArgs e) { foreach (IObserver LobjControl in lstControls) { LobjControl.Save(e); } } } public interface IObserver { void Update(SaveEventArgs e); } public partial class Baseline_Baseline : BaselineBasePage { . . . this.Add(_ucPI); this.Add(_ucPI1); protected void abActionBar_saveClicked(object sender, EventArgs e) { SaveEventArgs se = new SaveEventArgs(); se.TabType = (BaselineTabType)tcBaseline.ActiveTabIndex; this.Update(se); } } Public class Baseline_PriorNonDeloitte : System.Web.UI.UserControl,IObserver { public void Update(SaveEventArgs e) { } } More info at: http://www.dofactory.com/Patterns/PatternObserver.aspx span.fullpost {display:none;}

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  • ISA Proxy server

    - by user59931
    Have a proxy at work that runs Microsoft ISA. i used to be able to connect using 11.10 with firefox no problem at all. i could either put the settings in firefox or the settings in ubuntu network proxy settings. this would give me a connection no problem ( slow due to the work network being really lame) since i upgraded with 12.10 firefox just crashes if i have any proxy settings (manual added the proxy settings). if i connect to a diffrent network without the proxy settings it works fine and doesn't crash i tried chrome to see if that would work... simular problem. chrome doesn't crash but is so slow it just times out all the time and can take 10min for a page to load.... not really sure where to go with this? i have tried a clean install of 12.04 on 2 diffrent computers and also both tried just upgrading from 11.10. Only answer i can see at the moment is role back to 11.10 :( i have tried all sorts like turning of IPv6 to see if that would make any diffrence but no joy... really am lost now. whats weird is the repositys are also really really slow through 12.04. 50 megs took an hour to download (ISA server has Ubuntu rep servers enables without authenication). really am lost

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  • Antenna Aligner part 1: In the beginning.

    - by Chris George
    Picture the scene, it's 9pm, I'm in my caravan (yes I know, I've heard all the jokes!) with my family and I'm trying to tune the tv by moving the aerial, retuning, moving the aerial again, retuning... 45 mins and much cursing later I succeed. Surely there must be an easier way than this? Aha, an app; there must be an app for that? So I search in the AppStore for such an app, but curiously drew a blank. Then the seeds of the idea started to grow. I can code, I work in a software house with lots of very clever people, surely I can make an app that points to the nearest digital tv transmitter! Not having looked into app development before, I investigated how one goes about making an iPhone app and was quickly greeted by a now familiar answer "Buy a mac!". That was not an option for many reasons, mostly wife related! My dreams were starting to fade until one of my colleagues pointed out that within Red Gate, the very company I work for, there was on-going development on a piece of software that would allow me to write an app using Visual Studio on a Windows machine, Nomad! Once I signed up for the beta program I got to work learning the Jquery mobile / Phonegap framework. Within a couple of hours I had written (in Visual Studio), built in the cloud (using Nomad) and published (via TestFlight) my first iPhone app onto my iPhone ! It didn't do much, but it was a step in the right direction. To be continued...

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