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• MVC design patterns

  - by insane-36

  I have an application and it does not use a very good structure. However it seems to me that I have tried to stick to mvc design pattern but a senior engineer claims that I have no design patterns and code are mesh. How I have structured the code : I have couple of nsmanagedobject model classes which represents model in my case and a reskit library which encapsulates the nsurlconnection and url request. I fetch the request from the view controller itself and then when the request get completed I create predicate and then populate it in tableview. Wherever I need custom view either I create it in nib or create in a custom subclass of UIView. I have use delegation pattern and notification to communication to view controller, views and block callback with restkit. But, the senior engineer is very new to ios. He has been doing it for 2 months now but he is a good java programmer. So, what is mvc pattern ? Is core data model not working as a model objects, view controller as controller and views. I dont seem to find any other places or any other cases to create my own model object since the most of the models are used as NSManagedObject subclass.

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• Java or Python? Career/Start-up advice needed [closed]

  - by vim

  I have a full-time PHP job and I've been working with PHP for 5 years. As you can guess after spending 5 years I'm not willing to stay within this technology stack any more. I also worked with Java for 2 year before, so for me it looks more obvious to switch back to Java. However during last 5 years I was thinking about starting my own project, and now I think I have a very good SAAS idea. I'm completely confused what technology should I use for my project. I don't want to do it in PHP, and after reading many articles about rapid prototype development it seems to me that Django/Ruby is the best option. I will continue to work full time for my current employer because I need to pay my bills and will work on my project in my free time. The concern I have is should I do my project in Java or Python? To be realistic there is always a risk when you are doing your own project/start-up. If I do it in Java in the worst case scenario I believe I will be able to find a full time Java position because I already have some experience in Java + recent experience in my project. With regards to Python it looks like it is not very popular in my area and salaries are much more lower then for Java. On the other hand I have a feeling that if I chose Java it will take me a way longer to finish my project. Guys I'm completely confused and I need your advice. P.S. I have moved to London 2 years ago from another country, local guys are very welcome to share their thoughts about London's job market.

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• My hard disk does't get recognized

  - by SteveL

  For a few days now I have a problem with my 500GB internal hard disk. I am on Linux Mint 13 but I have the same problem with my Windows installation. When running fdisk -l I can see my hard disk (same on BIOS) but I can't mount it even via the disk utility program. In Windows XP I can see it on the My Computer menu but when I click it, it say's: D:\ is not accessible The file or directory is corrupted and unreadable Is there a way to fix it? Or at least save some of my files and format it? Should I be thinking about the worst-case scenario e.g. my HDD is dead? Edit: The filesystem is NTFS.

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• Bacula configuration for clients that are turned on and off randomly

  - by Rastloser

  I'm evaluating Bacula as a centralized backup tool for a small network where users will turn machines on and off unpredictably. Some of the headless Linux boxes I need to back up are intended to be turned off by pressing the on/off-button on the case, without any way of telling the user to wait for a backup job to finish. So, we don't know when backup jobs may run (anacron might help with this, right?) and we don't know whether they'll be allowed to finish. Is Bacula a reasonable choice for such an environment?

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• Hard Disk recovery

  - by Shaihi

  I have 3 disks of the same type model and year of production. All the disks were used part of a generic solution of an IBM server solution. My problem is that all 3 disks suffered the same malfunction at the same exact time and are now dis-functional. I went to two different expert's laboratories and got the same answer: To recover the data they need another identical disk from which they can take spare parts. Can my case really be that clinical? Anyway, I am not sure if this question belongs to this forum, but I am looking to buy the following disk: IIBM ESERVER XSERIES IBM P/N 24P3707 IBM FRU 24P3708 146.8GB USCSI 10K RPM PART NOMBER 9V2005-027 I already bought a disk with the same part number, but the labs said that apparently I need a disk that was manufactured in the same factory. That means that all the numbers have to be exactly the same. If anybody know where I can purchase such a disk (the information on the lost disks is really important to me), please tell me the place.

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• Helping to Reduce Page Compression Failures Rate

  - by Vasil Dimov

  When InnoDB compresses a page it needs the result to fit into its predetermined compressed page size (specified with KEY_BLOCK_SIZE). When the result does not fit we call that a compression failure. In this case InnoDB needs to split up the page and try to compress again. That said, compression failures are bad for performance and should be minimized.Whether the result of the compression will fit largely depends on the data being compressed and some tables and/or indexes may contain more compressible data than others. And so it would be nice if the compression failure rate, along with other compression stats, could be monitored on a per table or even on a per index basis, wouldn't it?This is where the new INFORMATION_SCHEMA table in MySQL 5.6 kicks in. INFORMATION_SCHEMA.INNODB_CMP_PER_INDEX provides exactly this helpful information. It contains the following fields: +-----------------+--------------+------+ | Field | Type | Null | +-----------------+--------------+------+ | database_name | varchar(192) | NO | | table_name | varchar(192) | NO | | index_name | varchar(192) | NO | | compress_ops | int(11) | NO | | compress_ops_ok | int(11) | NO | | compress_time | int(11) | NO | | uncompress_ops | int(11) | NO | | uncompress_time | int(11) | NO | +-----------------+--------------+------+ similarly to INFORMATION_SCHEMA.INNODB_CMP, but this time the data is grouped by "database_name,table_name,index_name" instead of by "page_size".So a query like SELECT database_name, table_name, index_name, compress_ops - compress_ops_ok AS failures FROM information_schema.innodb_cmp_per_index ORDER BY failures DESC; would reveal the most problematic tables and indexes that have the highest compression failure rate.From there on the way to improving performance would be to try to increase the compressed page size or change the structure of the table/indexes or the data being stored and see if it will have a positive impact on performance.

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• Windows 7 install crashes

  - by Alan Whitelaw

  I have a strange case that I cannot install windows 7 or windows vista on my 3 year old PC. The machine is an MSI K9NGM, with an AMD AM2 processor. I have bought a new Samsung SATA drive to install Windows 7 on, so as to preserve my existing XP install which I intend to dual boot in the future. However about half way through either a vista or w7 install (just after the mouse is shown for the first time, after the first restart) the machine will crash with a blue screen. I have removed, reordered the memory in the machine, with no luck. Does anyone have any experience of why this would happen with BOTH vista and w7 when everything is fine with XP?

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• CSMA between APs in same channel & different SSID ?

  - by Ranganathan

  Would be great if someone clarifies this doubt. Lets assume two Wireless Access Points AP1 & AP2 with these conditions 1. both in the same 802.11 standard 2. same channel 3. using different SSIDs (just like in adjacent apartment houses). In this case, do these two Access points (and the clients associated to them) coordinate via CSMA/CA ? ie., if one of the AP's or a client station is about to transmit, does it wait & observe the other AP's & its clients' transmission before sending the frame in air ? Also, do the clients associated with these different APs coordinate via CSMA/CA ?

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• How to gun shots sounds right in game development?

  - by G3tinmybelly

  So I am now trying to find sounds for my guns but when I grab a gun sound effect and play it in my game a lot of the sounds are either terrible sounding or have this horrible echoing effect because as a gun shoots sometimes the previous sound is playing still. public void shoot(float x, float y, float direction){ if(empty){ PlayHUD.message = "No more bullets!"; return; } if(reloading){ return; } if(System.currentTimeMillis() - lastShot < fireRate){ //AssetsLoader.lmgSound.stop(); return; } float dx = (float) (-13 * Math.cos(direction) + 75 * Math.sin(direction)); float dy = (float) (-14 * -Math.sin(direction) + 75 * Math.cos(direction)); float dx1 = (float) (-13 * Math.cos(direction) + 75 * Math.sin(direction)); float dy1 = (float) (-14 * -Math.sin(direction) + 75 * Math.cos(direction)); PlayState.effects.add(new MuzzleFlashEffect(x + dx1, y + dy1, (float) Math.toDegrees(-direction))); PlayState.projectiles.add(new Bullet(this, x + dx, y + dy, (float) (direction + (Math.toRadians(MathUtils.random(-accuracy, accuracy)))))); if(OptionState.soundOn){ AssetsLoader.lmgSound.play(OptionState.volume); } bulletsInClip--; lastShot = System.currentTimeMillis(); } Here is the code for where the sound plays. Every time this method is called the sound is called but it happens so often in this case that there is this terrible echoing. Any idea on how to fix this?

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• Syncing Large Directories/Filesystems using USB Drive

  - by Alan Lue

  Does anyone have a solution for syncing large directories/filesystems using just a USB flash drive (and specifically without using a network connection)? The objective is simply to sync a user directory between two computers. The contents of the user directory could amount to a large quantity of data—say, a quantity larger than could be stored on any single USB drive—but the aggregate size of changes that must be propagated by a single sync could easily fit on a USB drive. As an example, suppose a user directory is already synchronized between a desktop and a laptop computer. Here's a use case: Some changes are made in the user directory on the desktop. We mount a USB drive onto the desktop and copy whatever changes need to be applied to the laptop user directory in order to synchronize the desktop and laptop user directories. We now mount the USB drive onto the laptop and apply the changes. The desktop and laptop user directories are now synchronized. Any ideas? Alan

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• Should I indicate that the user exists or was deleted on the error page?

  - by animuson

  On an ordinary public website, the user's profile is always publicly visible to all visitors (such as Stack Overflow), where they can limit certain pieces of information via privacy settings or just removing the information. Now the user has decided to delete their account (in my case deactivate) so that their account doesn't technically "exist" anymore. The way my system is set up, when their account is deactivated, their username for any content connected to them just becomes "Anonymous User" as if it were a guest that posted. I feel like this could cause some confusion for other users. I'm also concerned about what kind of error to display when someone attempts to view their profile page. My gut tells me to just display a standard 404 page to hide the fact that they ever existed, but then you also have to consider that, since usernames must be unique, anyone can go to the register page and type in the username to see if it really exists or not. I have a similar problem with another website, which gives users the ability to hide their profiles from the public and only allow registered users to view it. Again it's with the dilemma of what kind of error message to display when an unregistered users attempts to view their profile with invalid permissions. So, would it be acceptable to display basic errors such as "user has been deactivated" or "you must be logged in to view this profile" in order to give other visitors some idea of why the page can't be displayed, or should I attempt to cover the user's privacy a little and just display a standard 404 without indicating in any way that the user might exist? Are there any other issues that I'm not realizing about either route? To go back to the beginning, should I even bother changing the user's name to "Anonymous User" when their account is deactivated? Would it be acceptable to just display a non-linked version of their username in place of the normal linked display name?

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• AD Local Admins without password sharing

  - by Cocoabean

  My team is building out an Active Directory environment in a small grad school with support for general computer labs, and staff/faculty machine and account management. We have a team of student consultants that are hired to do general help desk work. As of now we have a local admin account on every machine. It has the same password and all of us know it. I know it's not best practice and I want to avoid this with the new setup. We want to have local admin accounts in case there are network issues that prevent AD authentication, but we do not want this account to be generic with a shared password. Is there a way we can get each machine to cache the necessary information to authenticate a group of local admins so that if AD is somehow inaccessible, student consultants can still login with their AD admin accounts?

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• How to input data into user defined variables into MySql query

  - by user292791

  Simple Shell script echo "Enter 1 for month of March" echo "Enter 2 for month of April" echo "Enter 3 for month of May" read Month case "$Month" in 1) echo "enter establishment name" read a; mysql -u root -p $a < "March.sql";; 2) echo "enter establishment name" read b; mysql -u root -p $b < "April.sql";; 3) echo "enter establishment name" read c; mysql -u root -p $c < "May.sql";; esac done In this i have three other query files March.sql, April.sql, May.sql. i'm linking this in shell script . Example of .sql file: SELECT DISTINCT substr( a.case_no, 3, 2 ), b.case_type, b.type_name, a.case_no into outfile '/tmp/April.csv' FIELDS TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '\r\n' FROM Civil_t AS a, Case_type_t AS b, disposal_proc AS c WHERE substr( a.case_no, 3, 2 ) = b.case_type AND a.date_of_decision BETWEEN '2014-04-01' AND '2014-04-30' AND a.case_no = c.case_no AND a.court_no =1; I have to alter the .sql script every time. Is there any method to read the variables from shell script and use it in mysql. For example:- echo "enter date" read a #input date Now i have read a "date" and i want to use it in March.sql query in where clause. Is there is any method of using this variable in .sql query.

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• How to force Windows XP to rename a file with a special character?

  - by codeLes

  I have a song that Windows can't play because there is a question mark in the name of the file. "Where Have All the Cowboys Gone?.ogg" // as an example So I try to rename it and Windows complains whether I try it in Explorer or from command prompt. Error I get when trying to copy, rename, or move is: The Filename, directory name, or volume label syntax is incorrect Is there a Windows way to force a rename in this case? Update I'll keep an eye on this question, but after 13 answers and many attempts (aside form 3rd party solutions) it seems that Windows can't do this (or at least my windows can't, no short names). So I'm accepting the answer which was my original solution anyway of using Linux. It would be nice to see Windows handle this somehow, so don't stop just because I've accepted this answer, the question still stands!

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• Group Policy dealing with IE zone assignment not sticking!

  - by Brandon

  I have a group policy (which ONLY deals with the zone assignment) -that is continually switching on and off with reboots. I thought it was a conflicting group policy but when I run group policy modeling report it doesn't show any descrepancies that I can see. I thought it may be an issue with one domain controller wasn't replicating my policy change to the other one, but this isn't the case. I checked both domain controllers and they show the same information. The assignment is on a user basis and is in: user configuration > administrative templates > windows components > internet explorer > internet control panel > security and is site to zone assignment.

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• I cannot change the grub Default item from OS-1, but I can from OS-2 (dual-boot 10.04 on both)

  - by fred.bear

  My 10.04 system (OS-1) got into a tangle the other day, so I installed a second, dual-boot 10.04 (OS-2), so that I could trouble-shoot the hung system... In case it is relevant to my question, I'll mention that since I got OS-1 working again, it has shown a few battle wounds from its ordeal (.. actually the ordeal was mine ... trying to figure it all out ;) ... I lost some custom settings, but not all. (For the curious: the hangup was caused by rsync writing 600 GB to OS-1's 320 GB drive.. The destination drive was unmounted at the time, and rsync dutifully wrote directly to /media/usb_back; filling it to capacity... I have since, ammended my script :) Because the dual-boot MBR was prepared by OS-2, it is first on the grub list.. However, I want OS-1 to be the default OS to boot... From OS-1, I tried two methods to change the grub-menu's defaule OS. eg. Directly editing /etc/default/grub (then update-grub) Running 'Startup Manager' (then update-grub) Neither of these methods had any effect... so I started OS-2, and tried method 1... It worked! Why can I not change the grub menu from OS-1? .. or if it can be done, How?

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• rsync synchronizing files only without creating folders on destination

  - by Vincent

  Is it possible with rsync to not create directories on destination? Imagine I have that source : a/ a/x.txt b/ b/y.txt And that I have this destination : a/ a/z.txt The wanted result of rsync source destination : a/ a/x.txt a/z.txt Of course my real situation involves thousand files/folders structure and I don't want solutions involving explicit list of synced folders, which I can do. I'm looking for a clean way just to prevent any folder creation on destination. By exclude or filtering... That could even be something outside rsync, like a hack with permissions if rsync can't do this... For information, this is really easy to get this kind of situations, in my case I have: A server with 2 disks, let's say A & B. And a local drive C. I usually use rsync to sync (and merge) remote A & B into local C. Then sometimes I just want to sync back some C files into A and B. (Just new Files... not non-existing folders on destination)

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• Auto create folders using Excel field entries

  - by prrao

  I need to generate folders containing certain Excel field entries: Additionally, I need to append a date to the folder name based on that entry So If I have the above Excel table, I'd need the following set of folders to be generated in the same directory: Is this possible using a macro? Also, in case I add another entry how would I generate another folder only for that entry; for example I add another project CWO-1106: Basically, I'd like to keep updating the Excel sheet and create folders only for the new entries Any help would be appreciated. Thanks!

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• Incremental search for un/accented characters

  - by user38983

  Does emacs have an incremental search mode, where searching for a character will search for itself and for any other versions of the character with accent marks, similar to how Google Chrome (at least v27) will do when searching in a page? Alternatively, is there an additional library or piece of elisp code that can put incremental search in such a mode? For example, incremental search for: 'manana', would find 'manana' or 'mañana' 'motley crue', would also find 'Mötley Crüe' (with case-sensitivity off). Even a solution that only covers a subset of these characters would be helpful.

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• Kloxo - Use third party nameserver

  - by LePhleg

  Here's my case: I got my domain from a registrar. I got my VPS up from a provider who also offers free DNS hosting, on their own server (separately from my VPS, IP:111.111.111.111). So I got these third-party nameservers, lets name them: ns1.provider.com ns2.provider.com and pointed my domain registrar to them. I let it propagate for 24 hours so I believe its ok. (if I ping my domain I get the IP for these nameservers - 111.111.111.111) Afterwards I headed to my providers cPanel (the one they gave me for the DNS hosting service) and changed the default A Record IP from 111.111.111.111 to the IP associated with my VPS (IP:222.222.222.222). The last step, as I see it, is to configure my VPS via Kloxo panel and add the domain. Can someone guide me how can I achieve that? Is it just enough to create a new DNS Template and add as Primary DNS "ns1.provider.com" and Secondary DNS "ns2.provider.com"? Every tutorial I found is using Kloxo to create local nameservers on the same VPS which is something I want to avoid to save resources..

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• Laptop using 14.04 won't get past login GUI

  - by Dave M G

  My laptop was working perfectly yesterday, and now today I can't log in. At first, I was only getting a black screen. However, after following instructions in some questions here on AskUbuntu, I first reinstalled lightdm, and then I had to change the ownership of the file ~/.Xauthority to be my user name. Now, I get the log in GUI screen. However, once I enter my username, it flickers and then comes back to the login GUI. It does not matter if I use Gnome, Unity, or Gnome-Flashback. I don't know why lightdm needed to be reconfigured, or how ~/.Xauthority got changed, but in any case, what is still standing in my way, preventing me from logging in? Update: I have tried deleting the .Xauthority file, and the .profile files in my home directory. It has not changed anything. Logging in as guest also fails to work. The following commands did not work: mv ~/.config ~/.config.BAK mv ~/.cache ~/.cache.BAK Inside .xsession-errors in my home directory, it says: Gdk-CRITICAL: gdk_x11_display_get_xdisplay: assertion 'GDK_IS_DISPLAY (display)' failed

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• Disqus cache of unposted posts

  - by user129107

  Some webpages implement Disqus and also have the rather bad policy of adding auto refresh to the page. This result in for example one writing a long answer in a debate and then a refresh comes along – and everything is gone. Is the comments, written, but not posted, cached somewhere? Is it possible to retrieve? I have experienced this on various pages. In the current case the debate page was reloaded and a rather lengthy post with a lot of references and long thought out sentences vanished. This page closes the debate during night time, and do a auto refresh of the page when one pass midnight – as such I'm not able to retrieve the debate for another 8 hours. Other pages implement for example an auto refresh after 20 minutes. Linux, Google Chrome.

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• Eclipse Juno Switch Editor in Order

  - by inspectorG4dget

  In case it matters: OS: Mac OS X Lion (10.7.4) Eclipse: Juno, Build id: 20120614-1722 I have several files open in my eclipse workspace as tabs. The default shortcuts for previous and next editors are ?F6 and ?shiftF6. I know how to change these shortcuts, that's not the issue. However, what I want to do, is switch between editors in the way in which they're ordered in the tab bar. Currently, the editors change in order of last used/viewed. So, if I had three files (A, B and C in order) open and I'm currently editing A and I edited B last, when I use the shortcut for "Previous Editor", it takes me to B instead of C (and vice versa). Is there any way for me to get this functionality out of eclipse (if so, how)? Thank you

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• Does a receiving mail server (the ultimate destination) see emails delivered directly to it vs. to an external relay which then forwards them to it?

  - by Matt

  Let's say my users have accounts on some mail server mail.example.com. I currently have my mx record set to mail.example.com and all is good. Now let's say I want to have mails initially delivered to an external service (e.g. Postini. Note that this is not a postini-specific question though). In the normal situation where my mx is set directly to my mail server mail.example.com, sending MTAs will of course look up my MX and send to mail.example.com. In my new situation I'd have my mx set to mx.othermailservice.com and emails would be received there. OtherEmailService.com will then relay the emails (while keeping the return-path header the same) to mail.example.com. Do the emails that are received at mail.example.com after be relayed from the other service "look" any different than emails that go directly to it as would be the case where the mx was set to mail.example.com?

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• Many user stories share the same technical tasks: what to do?

  - by d3prok

  A little introduction to my case: As part of a bigger product, my team is asked to realize a small IDE for a DSL. The user of this product will be able to make function calls in the code and we are also asked to provide some useful function libraries. The team, together with the PO, put on the wall a certain number of user stories regarding the various libraries for the IDE user. When estimating the first of those stories, the team decided that the function call mechanism would have been an engaging but not completely obvious task, so the estimate for that user story raised up from a simple 3 to a more dangerous 5. Coming to the problem: The team then moved to the user stories regarding the other libraries, actually 10 stories, and added those 2 points of "function call mechanism" thing to each of those user story. This immediately raised up the total points for the product of 20 points! Everyone in the team knows that each user story could be picked up by the PO for the next iteration at any time, so we shouldn't isolate that part in one user story, but those 20 points feel so awfully unrealistic! I've proposed a solution, but I'm absolutely not satisfied: We created a "Design story" and put those annoying 2 points over it. However when we came to realize and demonstrate it to our customers, we were unable to show something really valuable for them about that story! Here the problem is whether we should ignore the principle of having isolated user stories (without any dependency between them). What would you do, or even better what have you done, in situations like this? (a small foot-note: following a suggestion I've moved this question from stackoverflow)

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