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• Inheriting projects - General Rules?

  - by pspahn

  This is an area of discussion I have long been curious about, but overall, I generally lack the experience to give myself an answer that I would fully trust. We've all been there, a new client shows up with a half-complete project they are looking to finish and launch. For whatever reason, they fired their previous developer, and it's now up to you to save the day. I am just finishing up a code review for a new client, and in my estimation is would be better to scrap what the previous developers built since and start from scratch. There's a ton of reasons why I am leaning toward this way, but it still makes me nervous since the client isn't going to want to hear "those last guys built you a big turd, and I can either polish it, or throw it in the trash". What are your general rules for accepting these projects? How do you determine whether it will be better to start from scratch or continue with the existing code base? What other extra steps might you take to help control client expectations, since the previous developer may have inflated those expectations beyond a reasonable level? Any other general advice?

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• How to keep your third party libraries up to date?

  - by Joonas Pulakka

  Let's say that I have a project that depends on 10 libraries, and within my project's trunk I'm free to use any versions of those libraries. So I start with the most recent versions. Then, each of those libraries gets an update once a month (on average). Now, keeping my trunk completely up to date would require updating a library reference every three days. This is obviously too much. Even though usually version 1.2.3 is a drop-in replacement for version 1.2.2, you never know without testing. Unit tests aren't enough; if it's a DB / file engine, you have to ensure that it works properly with files that were created with older versions, and maybe vice versa. If it has something to do with GUI, you have to visually inspect everything. And so on. How do you handle this? Some possible approaches: If it ain't broke, don't fix it. Stay with your current version of the library as long as you don't notice anything wrong with it when used in your application, no matter how often the library vendor publishes updates. Small incremental changes are just waste. Update frequently in order to keep change small. Since you'll have to update some day in any case, it's better to update often so that you notice any problems early when they're easy to fix, instead of jumping over several versions and letting potential problems to accumulate. Something in between. Is there a sweet spot?

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• Transform coordinates from 3d to 2d without matrix or built in methods

  - by Thomas

  Not to long ago i started to create a small 3D engine in javascript to combine this with an html5 canvas. One of the issues I run into is how can you transform 3d to 2d coords. Since I cannot use matrices or built in transformation methods I need another way. I've tried implementing the next explanation + pseudo code: http://freespace.virgin.net/hugo.elias/routines/3d_to_2d.htm Unfortunately no luck there. I've replace all the input variables with data from my own camera and object classes. I have the following data: An object with a rotation, position vector and an array of 4 3d coords (its just a plane) a camera with a position and rotation vector the viewport - a square 600 x 600 surface. The example uses a zoom factor which I've set as 1 Most hits on google use either matrix calculations or don't implement camera rotation. Basic transformation should be like this: screen.x = x / z * zoom screen.y = y / z * zoom Can anyone point me in the right direction or explain to me howto achieve this? edit: Thanks for all your posts, I haven't been able to apply all this to my project yet but I hope to do this soon.

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• no way to use opendns on pppoe connection?

  - by magisterludi

  I have an old speedtouch usb modem (revision 0) and on my desktop with xubuntu 12.04 I've configured a pppoe connection. I can connect and my ISP assign an IP address and the DNS but the primary DNS address is not reachable by ping, the secondary yes but no address is resolved then I can't surf the web. Then I want to set the open DNS but there is bo way, if I change manually /etc/resolv.conf it is rewrited by some script (there is the flag usepeerdns on the configuration script, if I exclude it there is no way to assign any DNS server because resolv.conf is not read) also if I set not writable the file changing the default permission. I changed dhclient.conf with the code prepend domain-name-servers 208.67.222.222,208.67.220.220; and now if I connect by a wifi connection to my router I'm using openDNS server but ppp does not use this script as long as I can see and the DNS server is always setted by my ISP. How can I use set DNS manually to a PPP connection? Is there any way to change it after the connection? Why NetworkManager is not able to manage my dsl connection, it seems not able to manage the dsl usb cable modem. If I use pppoeconf NetworkManager doesn't start and I have to manually delete the lines added to /etc/network/interfaces because the system is not able to start with full configuration of network If I connect a modem-router to the same line I can surf with the DNS server assigned by my ISP, I can't figure why. Some suggestion? Thanks to all

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• UPS - Two computers - How to get them to both shutdown when battery is low?

  - by hamlin11

  Short Version: How do I get 2 computers to shutdown when a UPS battery gets low? Long Version: I have an APC UPS, the RS 1500. It has a USB cord that goes into my main dev computer. My dev computer will shutdown when the battery gets low. However, in addition, I have now hooked up a database server to the same UPS. How can I have that database server also know that it needs to shut down when the battery gets low?

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• Anyone tried dd'ing Raidmembers?

  - by DusteD

  I want replace all disks in a 10 disk raid6 (linux software raid). I could do this by pulling a disk, let the array rebuild, rinse, repeat. But this would take a very long time, and cause 10 rebuilds, which would most likely stress all 10 disks much more than simply reading each disk through once. My question is thus: Could I just shut down the array, and dd each old disk to a new disk and then start the array with the 10 new disks? In an ideal world, I would build another server and just copy the data via network, but this is not an ideal world.

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• FTP error 425 failed to establish connection

  - by cKK

  Getting "ftp error 425 failed to establish connection" when trying to connect to ftp server. Tried 2 ftp clients on 3 machines on same network and none work. However FTP works from home / mobile broadband. No ip blocks on ftp sever. Other ftp servers(differrent ip/hosts) work okay. firewall setup correct, no ports blocked. Is it possible to use a proxy for ftp a i think it's something with the ISP but taking too long to fix?

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• [Dear Recruiter] I developed in Mo'Fusion

  - by refuctored

  Forward: Sometimes I really feel like technology recruiters have no experience or knowledge of the field they are recruting for.  A warning to those companies hiring technical recruiters -- ensure that the technical recruiters you hire to fill a position are actually technical.  Here's proof below, where I make up completely ridiculous technologies, but still have interest from the recruiter for an interview. Letter to me: Hello - Your name came up as a possible match for a long term contract Cold Fusion Developer role I have in Bothell, WA.  This role requires you to be onsite in Bothell, WA. This is  a tough role to fill so I was hoping you might have someone you can recommend? Unfortunately no telecommute. Thank you! Sincerly, Mindy Recruiter My response: Mindy -- Wow I'm super-excited that you took the time to contact me about this position!  Let me tell you, you won't be disappointed with my skill set! Firstly, I've been developing in ColdFusion since 1993 before it was owned by Adobe and it was operating under code name, "Hot-Jack".  Recently I started developing under the Domain-View-Driven-Domain-Model (DVDDM), integrating client-side CF on Moobuntu.  Not only do I have a boat load of ColdFusion EXP,  I also have a ton of experience in the open source communities lesser known derivative of CF, Mo'Fusion (MF).  I've also invested thousands of hours of my time learning esoteric programming languages. Look forward to working with you! George And her response: Hi George – just left you a message. Give me a call at your convenience.  The role does require someone to be onsite here.. are you able to relocate yourself? Mindy [Sigh]

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• good free OCR with GUI for correcting errors (for Windows)

  - by Hugh Allen

  I've used SimpleOCR, which has a nice GUI for correcting errors. Unfortunately it makes a lot of errors! (and suffers other bugs and limitations) On the other hand Tesseract is more accurate but has no GUI at all. Is there a free OCR program for Windows which has a nice GUI and a low error rate? I want it to highlight suspect words (by OCR uncertainty, not just spell checking) and show the original (bitmap) word while I'm editing the OCRed word similar to what SimpleOCR does: Open-source would be best, followed by freeware, then trial / crippleware a long way behind.

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• How many cron jobs are too many?

  - by guitar-

  I have a couple of cron jobs for basic maintenance which aren't very resource-intensive. I also have custom task scheduling (which is just calling a .php file and passing information via GET, ie: cronjob.php?param1=param ...). These can add up pretty quickly. These just call system commands and run external programs (Nmap is one of them). They usually don't take long either. Anyway, can anyone tell me, roughly what point is too many? I know it's hard to say since it depends on what job is being run and how often, but at what point does the crontab program start "struggling"? Anyone have any idea? Thanks.

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• Preparing Automatic Repair appears out of nowhere & takes forever?

  - by Jörg B.

  I shutdown my work machine (Windows 8.1 Pro) without any errors appearing (and without installing any new software and especially no new drivers the last couple days) yesterday evening, turned it on this morning and it automatically started into 'Preparing Automatic Repair' mode. 1st of - is there any way to get more information WHY this is appearing out of the blue and.. 2ndly, how long is this usually supposed to take? This is a rather beefy machine (Intel 3770k / 4 core 3.9ghz, Intel SSDs only and 32 gb of ram) but this screen has been 'loading' for almost 1.5 hours now. Is there any sort of debug/verbose mode that would give me ANY indication what's going on?

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• What the Hekaton?

  - by Tony Davis

  Hekaton, the power behind SQL Server 2014′s In-Memory OLTP technology, is intended to make data operations run orders of magnitude faster on SQL Server. This works its magic partly by serving database workloads entirely from main memory, using memory-optimized table structures. It replaces the relational engine’s standard locking model with an optimistic concurrency model based on time-stamped row versions. Deeper down the Hekaton engine uses new, ‘latch free’ data structures. So far, so good, but performance improvements on this scale require a compromise, and the compromise is that these aren’t tables as we understand them. For the database developer, these differences are painful because they involve sacrificing some very important bits of the relational model. Most importantly, Hekaton tables don’t currently support FOREIGN KEY constraints or CHECK constraints, and you can’t put the checks in triggers because there aren’t any DML triggers either. Constraints allow a relational designer to enforce relational integrity and data integrity. Without them, of course, ‘bad data’ can get into our Hekaton tables. There is no easy way of preventing it. For several classes of database and data, this is a show-stopper. One may regard all these restrictions regretfully, seeing limited opportunity to try out Hekaton with current databases, but perhaps there is also a sudden glow of recognition. Isn’t this how we all originally imagined table variables were going to be, back in SQL 2005? And they have much the same restrictions. Maybe, instead of pretending that a currently-designed database can be ‘Hekatonized’ with a few mouse clicks, we should redesign databases for SQL 2014 to replace table variables with Hekaton tables, exploiting this technology for fast intermediate processing, and for the most part forget, for now, the idea of trying to convert our base relational tables into Hekaton tables. Few database developers would be averse to having their working tables running an order of magnitude faster, as long as it didn’t compromise the integrity of the data in the base tables.

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• ASP.NET High CPU Bringing Servers to their Knees

  - by user880954

  Ok, our new build is having 100% cpu spikes on each server at random intervals. For long durations it make the site totally unresponsive - this will be at peak times as people in different countries log on to the site etc. We've looked at perfmom, memory profilers, CLR profiler, sql profilers, Red gate ants profiler, tried load testing in UAT - but cannot even reproduce the problem. This could mean only thousands of users hitting the live site causes it to happen. One pattern we did notice was that the new code - the broken build - actually uses noticably less threads. We are also using spring for IOC - does this have a bed reputation? To make things worse, we cannot deploy to live due to the business impact - so cannot narrow the problem down to subset of the new features we've added. We truly are destroyed - has anyone got any battle scars that may save us a few lives?

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• Win XP Virtual Machine APP that won't START as a terminal services client

  - by Daniel

  I have a Win XP Virtual Machine APP that won't START as a terminal services client..... but if i disable terminal services inside the virtual machine, start the app then start terminal services... the APP runs fine (so long as terminal services are disabled when it starts.....!) My question is... is it possible to script things somehow so as to allow this app to be accessed directly from win 7 (with out having to manually run XP virtual machine)... I.E as I can not run it this way as it won't START with terminal services running.... I.e is it somehow possible to script things so the APP starts and terminal services is delayed then kicks in after a time delay.... (I know this may not be possible but I'm getting sick of all the mucking around...)

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• Pre game loading time vs. in game loading time

  - by Keeper

  I'm developing a game in which a random maze is included. There are some AI creatures, lurking the maze. And I want them to go in some path according to the mazes shape. Now there are two possibilities for me to implement that, the first way (which I used) is by calculating several wanted lurking paths once the maze is created. The second, is by calculating a path once needed to be calculated, when a creature starts lurking it. My main concern is loading times. If I calculate many paths at the creating of the maze, the pre loading time is a bit long, so I thought about calculating them when needed. At the moment the game is not 'heavy' so calculating paths in mid game is not noticeable, but I'm afraid it will once it will get more complicated. Any suggestions, comments, opinions, will be of help. Edit: As for now, let p be the number of pre-calculated paths, a creatures has the probability of 1/p to take a new path (which means a path calculation) instead of an existing one. A creature does not start its patrol until the path is fully calculated of course, so no need to worry about him getting killed in the process.

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• Is it customary to write Java domain objects / data transfer objects with public member variables on mobile platforms?

  - by Sean Mickey

  We performed a code review recently of mobile application Java code that was developed by an outside contractor and noticed that all of the domain objects / data transfer objects are written in this style: public class Category { public String name; public int id; public String description; public int parentId; } public class EmergencyContact { public long id; public RelationshipType relationshipType; public String medicalProviderType; public Contact contact; public String otherPhone; public String notes; public PersonName personName; } Of course, these members are then accessed directly everywhere else in the code. When we asked about this, the developers told us that this is a customary performance enhancement design pattern that is used on mobile platforms, because mobile devices are resource-limited environments. It doesn't seem to make sense; accessing private members via public getters/setters doesn't seem like it could add much overhead. And the added benefits of encapsulation seem to outweigh the benefits of this coding style. Is this generally true? Is this something that is normally done on mobile platforms for the reasons given above? All feedback welcome and appreciated -

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• Inheriting projects - General Rules? [closed]

  - by pspahn

  Possible Duplicate: When is a BIG Rewrite the answer? Software rewriting alternatives Are there any actual case studies on rewrites of software success/failure rates? When should you rewrite? We're not a software company. Is a complete re-write still a bad idea? Have you ever been involved in a BIG Rewrite? This is an area of discussion I have long been curious about, but overall, I generally lack the experience to give myself an answer that I would fully trust. We've all been there, a new client shows up with a half-complete project they are looking to finish and launch. For whatever reason, they fired their previous developer, and it's now up to you to save the day. I am just finishing up a code review for a new client, and in my estimation is would be better to scrap what the previous developers built since and start from scratch. There's a ton of reasons why I am leaning toward this way, but it still makes me nervous since the client isn't going to want to hear "those last guys built you a big turd, and I can either polish it, or throw it in the trash". What are your general rules for accepting these projects? How do you determine whether it will be better to start from scratch or continue with the existing code base? What other extra steps might you take to help control client expectations, since the previous developer may have inflated those expectations beyond a reasonable level? Any other general advice?

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• What are functional-programming ways of implementing Conway's Game of Life

  - by George Mauer

  I recently implemented for fun Conway's Game of Life in Javascript (actually coffeescript but same thing). Since javascript can be used as a functional language I was trying to stay to that end of the spectrum. I was not happy with my results. I am a fairly good OO programmer and my solution smacked of same-old-same-old. So long question short: what is the (pseudocode) functional style of doing it? Here is Pseudocode for my attempt: class Node update: (board) -> get number_of_alive_neighbors from board get this_is_alive from board if this_is_alive and number_of_alive_neighbors < 2 then die if this_is_alive and number_of_alive_neighbors > 3 then die if not this_is_alive and number_of_alive_neighbors == 3 then alive class NodeLocations at: (x, y) -> return node value at x,y of: (node) -> return x,y of node class Board getNeighbors: (node) -> use node_locations to check 8 neighbors around node and return count nodes = for 1..100 new Node state = new NodeState(nodes) locations = new NodeLocations(nodes) board = new Board(locations, state) executeRound: state = clone state accumulated_changes = for n in nodes n.update(board) apply accumulated_changes to state board = new Board(locations, state)

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• RSync to WebDAV mounted volume very slow

  - by AlexC

  I have a mounted WebDAV store, which I am playing around with to try and put together my own pseudo-DropBox set up. However, it seems very slow to upload larger files (my bandwidth graph goes ok for a little bit, then just stops dead for long periods of time). Has anyone tried this? I'm wondering if the way it gets mounted makes rsync think it's a local drive or something and so may be chattier than it would be if it knew it was a mounted network drive? (I'm new to rsync so may be all wrong here!) I'm syncing using rsync -rv /source/directory/ /mounted/webdav/directory/ This is running using MacOS 10.6, and WebDAV is mounted using the native mounting mechanism.

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• What Firefox UI customisations can be used to improve productivity?

  - by Umber Ferrule

  Most desk jobs these days involve the frequent use of a web browser. What Firefox UI customisations increase your productivity and make your working life easier? Not necessarily add-ons (although no reason why not as long as they're UI-related), but I'm thinking more along the lines of toolbar removal/placement, icon/menu removal/placement, tweaks to userChrome.css etc. to make things more pleasant and optimal. Screenshots welcome. I realise some people feel UI customisation makes switching between machines harder. Whilst I agree to some extent, if you mainly use one machine, and it helps your productivity - why not?

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• Creating a newspaper that effects the game's economy?

  - by zardon

  I am writing a game in Objective C/cocos2d where a newspaper is a central part of what controls or rather effects the game's world economy as well as what a city might do (such as increase X, reduce Y) The newspaper is a bit like a "Chance card" in Monopoly, it has an effect on something. My question is, what is the best way to do write a newspaper that has both a random and specific effect within the game. Would the best strategy be to write out all the things a newspaper can affect, a PLIST of headlines (with placeholders). I think Tiny Tower uses a PLIST of events and it randomly picks an event, but I'm not sure how it actually parses it because certain events do different things. But then how do I parse all the scenarios that a newspaper can deliver? A big switch statement seems very long and complicated to do. I am wondering if there is a simpler way to handle this kind of thing. Related to this is that there might be no news that day and I'm not sure what the newspaper should display, should it just display the last headline? So, in summary. 1) A newspaper generates a headline, it affects different things, such as the world economy, prices, how city reacts 2) I need the newspaper to generate headlines (although there may be days when there are no headlines at all), but I am not sure how to parse it without using a big-ass switch statement. Thanks in advance.

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• Oracle and Cavium to work together on Java SE 8 on 64-bit ARMv8

  - by Henrik Stahl

  We have been working for some time on a standard Oracle JDK 8 port to the upcoming introduction of 64-bit servers based on the new ARMv8 micro architecture. At ARM TechCon 2013 in Santa Clara, California, we announced a roadmap with an expected GA in 2015. This project is going very well and is ahead of schedule. We will soon be at the point where we will make binaries available outside of Oracle - first in a managed beta program with select customers/partners, and sometime during the fall of 2014 as a public early access program. Unless something changes, we are looking at a early 2015 GA. We should be able to share a detailed ramp down and GA plan by JavaOne 2014. One of the things we (obviously) need to produce a high-quality port is hardware for development and QA. We are therefore happy to announce that we will be collaborating with Cavium on this project. Cavium has been a supporter of the Java ecosystem for a long time and we have numerous joint customers running various Java versions on Cavium MIPS and ARM-based hardware. Cavium has now agreed to provide us with development hardware and engineering resources so that we can certify and optimize the initial Oracle JDK 8 release on Cavium's ThunderX hardware. This is expected to improve quality and performance of JDK 8 on ARMv8 in general, as well as on Cavium's hardware. For more information: Cavium announcement on the ThunderX product family Cavium announcement on Oracle collaboration As a reminder, we plan to release the Oracle JDK 8 port to 64-bit ARMv8 under the royalty-free (for general purpose servers etc) Binary Code License, but we have no current plans to open source it.

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• Bookmark Sentry Scans Your Chrome Bookmarks File For Bad Links and Dupes

  - by Jason Fitzpatrick

  Chrome: Bookmark Sentry, a free Chrome extension, takes the hard work out of checking your bookmark file for bad links and duplicates. Install it, forget about it, and get scheduled reports on the state of your bookmarks file. It’s that simple. Once you install the extension, open the options to toggle some basic settings to your liking (like the frequency of the scan, how long you want it to wait for a response, and whether you want it to look for bad links and/or duplicates). Once it finishes scanning you’ll get a report indicating the status of the links (why they are marked as missing or duped) and the ability to selectively or mass delete them. The only caveat we’d share is that it will tell you links behind any sort of security are unavailable. If you bookmark pages that you use for work, behind your corporate firewall for example, if the scanner runs when you’re not authenticated then it won’t be able to reach them. Other than that, it works like a charm. Bookmark Sentry is free, Google Chrome only. Bookmark Sentry [via Addictive Tips] How to Own Your Own Website (Even If You Can’t Build One) Pt 1 What’s the Difference Between Sleep and Hibernate in Windows? Screenshot Tour: XBMC 11 Eden Rocks Improved iOS Support, AirPlay, and Even a Custom XBMC OS

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• What is the proper step-by-step procedure to install any application in Ubuntu?

  - by Mr-Right

  I have just installed Ubuntu for the first time on PC, I have done some googling to get an idea about installing any application in Ubuntu but yet not clear about the proper procedure !! Most of the time when I try to install any application. Example: Opera, I downloaded the Opera installable package from http://www.opera.com/. Ran the downloaded file but the installer hangs up. <<OR If I try to install any installation package from Ubuntu Software Center/Software Source. Initially, it starts downloading but takes too long to process and fails almost in middle of 100%. Question: Is there any reliable, proper and easy step-by-step procedure?

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• Ubuntu - Create a link to a specified directory so I can easily change to that directory

  - by Denby

  Is it possible to create a symlink to a directory, like /var/lib/tomcat6/webapps/MyWar that I can access from everywhere? I want to be able to say cd myapp from anywhere in the directory tree and go to that directory. Is it only possible in the directory where I create the symlink? Do I have to update my ~/.bashrc file to include an alias like: alias myapp="cd /var/lib/tomcat6/webapps/MyWar" and then just type myapp from anywhere? What is the best way to handle this situation so I don't always have to type in the long directory? I also want to be able to use that parameter in say a copy command, so the alias wouldn't help in that situation. Hopefully I can do something similar where ~ maps to the home directory in any command.

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