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• Learning PHP OOP

  - by Ryan Murphy

  I have been coding PHP for about 2 years now and I THINK that I have a very good grasps of the fundamental parts of PHP, i.e. Functions foreach/IF statements sessions/cookies POST/GET Amongst a few others. I want to move on to learning OOP PHP now, so learning how to use classes and making it a really valuable skill. I have 1 requirement, the source must be a respected source that doesn't teach developers bad habits. I have the book: PHP and MySQL Web Development However, as useful as that is I would like an online source. I would like to know from people with experience in OOP PHP, how and where did they learn OOP PHP. Obviously by doing, but I would really appreciate some great resources which help me along the way.

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• What technology or skillset should I learn today in order to be able to charge $250+ / hr in 2-3 years? [closed]

  - by Ryan Waggoner

  I've been doing PHP freelance development for the last 4-5 years and I'm starting to max out my hourly rate. So in 2010 I decided to transition to a new language. I played with Python and Ruby, but ended up settling on iOS, for three reasons: I'm enjoying the challenge of working on a completely different type of development, instead of another flavor of web development The demand seems higher right now than for Ruby or Python I see iOS developers charging $150 - 250 / hr Whether these reasons are right or wrong, I've been learning iOS for the last year and I'm starting to get more work in that field. I feel confident that in six months (barring any major shifts in the ecosystem), I can be billing iOS work at $150 / hr or more. However, I'm feeling that I should have done this earlier, that I've missed the boat, and that iOS development is going to dry up or get much more commoditized. Whether this is true or not isn't really my question (though feel free to comment). What I want to know is: what should I start learning right now so that I can be ahead of the curve in a couple years when the demand is far outstripping supply? What technologies or skillsets are going to be so heavily in demand in 2-3 years that you'll be able to charge $250 / hr or more and stay busy? These don't have to be new technologies either...the answer could be iOS or COBOL or whatever.

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• Fresh Ubuntu Install - Grub not loading

  - by Ryan Sharp

  System Ubuntu 12.04 64-bit Windows 7 SP1 Samsung 64GB SSD - OS' Samsung 1TB HDD - Games, /Home, Swap WD 300'ishGB HDD - Backup Okay, so I'm very frustrated, so please excuse me if I miss anything out as my head is clouded by anger and impatience, etc. I'll try me best, though. First of all, I'll explain how I got to my predicament. I finally got my new SSD. I firstly installed Windows, which completed without a hitch. Afterwards, I tried to install Ubuntu, which failed several times due to problems irrelevant to this question, but I mention this to explain my frustrations, sorry. Anyway, I finally installed Ubuntu. However, I chose the 'bootloader' to be installed on the same partition as where I was installing the Ubuntu Root partition, as that was what I believed to be the best choice. It was of my thinking that it was supposed to go on the same partition and on the SSD, which is my OS drive, though with my problem, it apparently was wrong. So I tried to fix it by checking guides and following their directions, but seemed to have messed it up even more. Here is what I receive after I use the fdisk -l command: (I also added explanations for which I used each partition for) Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders, total 125045424 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x324971d1 Device Boot Start End Blocks Id System /dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda2 208896 48957439 24374272 7 HPFS/NTFS/exFAT /dev/sda3 48959486 125044735 38042625 5 Extended /dev/sda5 48959488 125044735 38042624 83 Linux sda1 --/ Windows Recovery sda2 --/ Windows 7 sda3/5 --/ Ubuntu root [ / ] Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc0ee6a69 Device Boot Start End Blocks Id System /dev/sdb1 1024208894 1953523711 464657409 5 Extended /dev/sdb3 * 2048 1024206847 512102400 7 HPFS/NTFS/exFAT /dev/sdb5 1024208896 1939851263 457821184 83 Linux /dev/sdb6 1939853312 1953523711 6835200 82 Linux swap / Solaris sdb3 --/ Partition for Steam games, etc. sdb5 --/ Ubuntu Home [ /home ] sdb6 --/ Ubuntu Swap Partition table entries are not in disk order Disk /dev/sdc: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x292eee23 Device Boot Start End Blocks Id System /dev/sdc1 2048 625141759 312569856 7 HPFS/NTFS/exFAT sdc1 --/ Generic backup I also used a Boot Script that other users suggested, so that I can give more details on my partitions and also where Grub is located... ============================= Boot Info Summary: =============================== => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos5)/boot/grub on this drive. => Grub2 (v1.99) is installed in the MBR of /dev/sdb and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos5)/boot/grub on this drive. => Windows is installed in the MBR of /dev/sdc. Now that is weird... Why would Grub2 be installed on both my SSD and HDD? Even weirder is why is Windows on the MBR of my backup hard drive? Nothing I did should have done that... Anyway, here is the entire Output from that script... PASTEBIN So, to summarize what I need: How can I fix my setup so grub loads on startup? How can I clean my partitions to remove unnecessary grubs? What did I do wrong so that I don't do something so daft again? Thank you so much for reading, and I hope you can help me. I've been trying to have a successful setup since Friday, and I'm almost at the point that I'm really tempted to throw my computer out the window due to my frustration.

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• How to Access Boot Options 12.04 Live USB

  - by Ryan Kampmeier

  I'm attempting to install 12.04 on my computer but booting from my USB drive results in a blank screen. This has happened since 10.04 and has always been fixed by putting nomodeset in the boot command, but now I can't access the boot options with F6 for some reason. How can I access the boot options? I booted into the live image on a different computer and it worked fine. I'm sure it's because of my Nvidia graphics. When I boot into the live image it shows a small gray box in the lower left corner of the screen and that's it. I can't edit the boot options or do anything else. Thanks in advance.

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• Need help installing Wine onto Ubuntu 12.10x64

  - by user106241

  I have tried to install wine through the software center and terminal and I get this error. chris@ubuntu:~$ sudo apt-get install wine1.5 [sudo] password for chris: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: wine1.5 : Depends: wine1.5-i386 (= 1.5.16-0ubuntu1) but it is not installable Recommends: gnome-exe-thumbnailer but it is not going to be installed or kde-runtime but it is not going to be installed Recommends: ttf-droid Recommends: ttf-mscorefonts-installer but it is not going to be installed Recommends: ttf-umefont but it is not going to be installed Recommends: ttf-unfonts-core but it is not going to be installed Recommends: winbind but it is not going to be installed Recommends: winetricks but it is not going to be installed E: Unable to correct problems, you have held broken packages.

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• Exchange 2010, Exchange 2003 Mail Flow issue

  - by Ryan Roussel

  While performing the initial Exchange 2010 deployment for a customer migrating from Exchange 2003, I ran into an issue with mail flow between the two environments.  The Exchange 2003 mailboxes could send to Exchange 2010, as well as to and from the internet.  Exchange 2010 mailboxes could send and receive to the internet, however they could not send to Exchange 2003 mailboxes.   After scouring the internet for a solution, it seemed quite a few people were experiencing this issue with no resolution to be found, or at least not easily.  After many attempts of manually deleting and recreating the routing group connectors,  I finally lucked onto the answer in an obscure comment left to another blogger.   If inheritable permissions are not allowed on the Exchange 2003 object in the Active Directory schema, exchange server authentication cannot be achieved between the servers.   It seems when Blackberry Enterprise Server gets added to 2003 environments, a lot of Admins get tricky and add the BES Admin user explicitly to the server object  to allow  inheritance down from there to all mailboxes.  The problem is they also coincidently turn off inheritance to the server object itself from its parent containers.  You can re-establish inheritance without overwriting the existing ACL however so that the BES Admin can remain in the server object ACL.   By re-establishing inheritance to the 2003 server object, mail flow was instantly restored between the servers.    To re-establish inheritance: 1. Open ASDIedit by adding the snap-in to a MMC (should be included on your 2008 server where Exchange 2010 is installed) 2. Navigate to Configuration > Services > Microsoft Exchange > Exchange Organization > Administrative Groups > First Administrative Group > Servers 3. In the right pane, right click on the CN=Server Name of your Exchange 2003 Server, select properties 4. Navigate to the Security tab, hit advanced toward the bottom. 5. Check the checkbox that reads “include inheritable permissions” toward the bottom of the dialogue box.

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• I know how to program, and how to learn how to program, but how/where do you learn how to make systems properly?

  - by Ryan

  There are many things that need to be considered when making a system, let's take for example a web based system where users log in and interact with each other, creating and editing content. Now I have to think about security, validation (I don't even think I am 100% sure what that entails), "making sure users don't step on each others feet" (term for this?), preventing errors in many cases, making sure database data doesn't become problematic through unexpected... situations? All these things I don't know how or where to learn, is there a book on this kind of stuff? Like I said there seems to be a huge difference between writing code and actually writing the right code, know what I mean? I feel like my current programming work lacks much of what I have described and I can see the problems it causes later, and then the problems are much harder to solve because data exists and people are using it. So can anyone point me to books or resources or the proper subset of programming(?) for this type of learning? PS: feel free to correct my tags, I don't know what I am talking about. Edit: I assume some of the examples I wrote apply to other types of systems too, I just don't know any other good examples because I've been mostly involved in web work.

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• Presenting in the UK 8-13 Sep 2012!

  - by andyleonard

  I will be in London delivering SSIS training ( Learning SQL Server 2012 Integration Services - 12-14 Sep). Whle there, I will be making other presentations! I am honored to present Designing an SSIS Framework at SQL Saturday #162 in Cambridge, UK on 8 Sep 2012! But that’s not all – that’s just the beginning of my tour of UK user groups. Monday 10 Sep, I am presenting at SQL South West in Exeter. Tuesday 11 Sep, Chris Webb and I are presenting at the SQL London User Group . Thursday 13 Sep, Chris...(read more)

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• Algorithmic Forecasting and Pattern Recognition

  - by Ryan King

  Say a user could enter project data into my software. Each project has 2 variables "size" and "work" and they're related but the relationship is not known. Is there a way to programmatically determine the relationship between the variables based on previous data and forecast the amount of work provided if only given the size of the project in the future? For Example, say the user had manually entered the following projects. Project 1 - Size:1, Work: 4 Project 2 - Size:2, Work: 7 Project 3 - Size:3, Work: 10 Project 4 - Size:4, Work: x What should I look into to be able to programmatically determine, that Work = Size*3+1 and therefor be able to say that x=13?

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• Developing a computer system based on Nand2Tetris [on hold]

  - by Ryan

  I recently finished a book called Nand2Tetris (nand2tetris.org) where I built my own computer system from scratch with its own machine language, assembly code, and a high level language called Jack that's translated to Hack binary. However, I feel like the "computer" I built throughout the course of this book (called the Hack computer) is a bit too simple for various reasons: 1) There are only two registers (D and A), whereas most computers have much more 2) Peripheral devices like mouse and keyboard have to be directly implemented 3) Peripheral devices use a pre-planned shared memory map to communicate with the CPU instead of using interrupts (which aren't covered at all) 4) Jack (the high level language) code doesn't compile to Assembly code directly, instead it compiles to an intermediate language, which in turn gets translated to Assembly. 5) There is no ROM or permanent storage device, everything is stored in RAM 6) No support for colored monitor, networking or sound I would like to build a more complicated computer system now based on what I've learned from Nand2Tetris. Does anyone know of any good resources or books to get started on this? (BTW by computer system I mean software that can emulate the hardware of a virtual computer with its own unique instruction set)

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• What browser do you build in? [closed]

  - by Ryan

  Lately I have been using Chrome, but I am starting to think I should use FF. What are the advantages and disadvantages of the various mainstream browsers (with an emphasis on Chrome and FF) when doing web development? Is it easier to start with clean code for a relatively conforming browser, and later add hacks/workarounds for acceptable display with less conforming browsers, or is it easier to work with a variety of browsers from the beginning, so we never have a page that's completely unacceptable with, for example, IE 6?

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• Ubuntu 12.04 Freezes at Bootup

  - by Ryan Yu

  I have an Acer Aspire One Model AO722, that has a dual-boot configuration with Windows 7 Home Premium and Ubuntu 12.04. Processor: AMD C-50, 1.00GHz 2.00GB ram, 64-bit, AMD Radeon HD 6250 Graphics. I installed Ubuntu two days ago, and since then, loading it has been sporadic. Windows 7 still loads just fine, but Ubuntu will sometimes freeze. First time I booted Ubuntu up, it ran no problem. Worked with it for half an hour, then shut down the computer. The second time I booted it up, it froze after ten minutes when I was trying to set up Thunderbird. Third time, same thing. Fourth time, it froze about 5 minutes after bootup when I was trying to connect to my wifi. Fifth time, it ran no problems for about 5~ hours. Then, three consecutive times I've restarted (what is it, the 6th, 7th, and 8th times?) it has gotten to the login screen, I've entered my password, all the text on the page disappears as if its going to load my desktop, and it freezes. A minute ago when I booted Ubuntu up for the 9th time, it loaded the desktop fine. Who knows if it'll crash soon; probably, though. Any ideas?

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• What kind of position matches my skills, experience and interests? [closed]

  - by Ryan

  I work in a large firm and my current job covers a variety of different duties. Due to several factors I am seriously considering finding a new job (hours, pay-cut, limited career growth). I have worked for the company nearly 4 years and almost 2 years ago I transitioned into more of a business analyst role (previously I was working in a client facing role for our audit group). In this role I have overseen all aspects of the development of a large scale re-platforming of our firm's key tool in analyzing investment portfolios. I gathered requirements, wrote specs, designed the UI and functionality, worked closely with developers (onshore and offshore) to see to it the implementation was correct, managed schedules and was the lead tester. This is a large scale system used by thousands of people around the world. I've also written Excel macros, reports in SQL, given trainings, written technical manuals, interfaced with senior managers and partners, etc. I've been on a couple interviews sporadically, most of which were for positions aimed at higher management consulting type positions, dealing with strategy, overall process management, project management, etc. What really interests me is the technical stuff and overseeing a project from beginning to end (although I would rather not have to do so many of the tasks on my own). I genuinely like a lot of what I do, but the company culture and attitude towards overworking people combined with my recent pay-cut (my overtime was cut due to a promotion to a higher level) has lead me to want to seek work elsewhere. The problem is - what type of work could I realistically do? I feel like traditional business analysis is too much business and not enough tech stuff, and I've really taken a shine lately to beefing up my programming abilities and creating small programs to automate things around work. I also feel that because my actual years of experience as a business analyst (figure 1.5 years realistically) puts me at a junior level doing a lot of grunt requirements gathering, when the work that I have been doing with my current company is more in line with what a Program Manager does (depending on your definition I guess). So in reality, when I'm job hunting I get a bit perplexed because I feel like the traditional BA stuff wouldn't really suit me, and even if it did it's usually something along the lines of 5-10 years experience for the type of work that is similar to what I've done (and I've also found most BA jobs to be contract only which at the moment I'm not too keen on). Program Manager is something that interests me, but again I feel like the experience is lacking because that's a much more senior position. Am I in some kind of career no-man's land? Any idea what would best suit me given my experience and abilities, as well as my interests? I plan to keep learning programming on the side, but don't expect to get a job being a straight programmer given my relative inexperience with programming.

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• Am I deluding myself? Business analyst transition to programmer

  - by Ryan

  Current job: Working as the lead business analyst for a Big 4 firm, leading a team of developers and testers working on a large scale re-platforming project (4 onshore dev, 4 offshore devs, several onshore/offshore testers). Also work in a similar capacity on other smaller scale projects. Extent of my role: Gathering/writing out requirements, creating functional specifications, designing the UI (basically mapping out all front-end aspects of the system), working closely with devs to communicate/clarify requirements and come up with solutions when we hit roadblocks, writing test cases (and doing much of the testing), working with senior management and key stakeholders, managing beta testers, creating user guides and leading training sessions, providing key technical support. I also write quite a few macros in Excel using VBA (several of my macros are now used across the entire firm, so there are maybe around 1000 people using them) and use SQL on a daily basis, both on the SQL compact files the program relies on, our SQL Server data and any Access databases I create. The developers feel that I am quite good in this role because I understand a lot about programming, inherent system limitations, structure of the databases, etc so it's easier for me to communicate ideas and come up with suggestions when we face problems. What really interests me is developing software. I do a fair amount of programming in VBA and have been wanting to learn C# for awhile (the dev team uses C# - I review code occasionally for my own sake but have not had any practical experience using it). I'm interested in not just the business process but also the technical side of things, so the traditional BA role doesn't really whet my appetite for the kind of stuff I want to do. Right now I have a few small projects that managers have given me and I'm finding new ways to do them (like building custom Access applications), so there's a bit here and there to keep me interested. My question is this: what I would like to do is create custom Excel or Access applications for small businesses as a freelance business (working as a one-man shop; maybe having an occasional contractor depending on a project's complexity). This would obviously start out as a part-time venture while I have a day job, but eventually become a full-time job. Am I deluding myself to thinking I can go from BA/part-time VBA programmer to making a full-time go of a freelance business (where I would be starting out just writing custom Excel/Access apps in VBA)? Or is this type of thing not usually attempted until someone gains years of full-time programming experience? And is there even a market for these types of applications amongst small businesses (and maybe medium-sized) businesses?

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• Contract / Project / Line-Item hierarchy design considerations

  - by Ryan

  We currently have an application that allows users to create a Contract. A contract can have 1 or more Project. A project can have 0 or more sub-projects (which can have their own sub-projects, and so on) as well as 1 or more Line. Lines can have any number of sub-lines (which can have their own sub-lines, and so on). Currently, our design contains circular references, and I'd like to get away from that. Currently, it looks a bit like this: public class Contract { public List<Project> Projects { get; set; } } public class Project { public Contract OwningContract { get; set; } public Project ParentProject { get; set; } public List<Project> SubProjects { get; set; } public List<Line> Lines { get; set; } } public class Line { public Project OwningProject { get; set; } public List ParentLine { get; set; } public List<Line> SubLines { get; set; } } We're using the M-V-VM "pattern" and use these Models (and their associated view models) to populate a large "edit" screen where users can modify their contracts and the properties on all of the objects. Where things start to get confusing for me is when we add, for example, a Cost property to the Line. The issue is reflecting at the highest level (the contract) changes made to the lowest level. Looking for some thoughts as to how to change this design to remove the circular references. One thought I had was that the contract would have a Dictionary<Guid, Project> which would contain ALL projects (regardless of their level in hierarchy). The Project would then have a Guid property called "Parent" which could be used to search the contract's dictionary for the parent object. THe same logic could be applied at the Line level. Thanks! Any help is appreciated.

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• Why does the HUD jump around as I type or move my mouse?

  - by Ryan McClure

  I use the Unity Revamped package for my Unity interface. I have noticed that, however, this behavior exists for any account on my computer, even guest, on BOTH the Revamped and the Canonical release of Unity. Here is a link to what it looks like, because it is hard to describe it. I don't know of anyone else who has this issue. I am running Unity 5.16 on Ubuntu 12.04. As an aside, I also have noticed this behavior with a fresh install of 12.10 Beta 1 on a separate partition.

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• Best way to redirect users back to the pretty URL who land on the _escaped_fragment_ one?

  - by Ryan

  I am working on an AJAX site and have successfully implemented Google's AJAX recommendation by creating _escape_fragment_ versions of each page for it to index. Thus each page has 2 URLs: pretty: example.com#!blog ugly: example.com?_escaped_fragment_=blog However, I have noticed in my analytics that some users are arriving on the site via the "ugly" URL and am looking for a clean way to redirect them to the pretty URL without impacting Google's ability to index the site. I have considered using a 301 redirect in the head but fear that Googlebot might try to follow it and end up in an endless loop. I have also considered using a JavaScript redirect that Googlebot wouldn't execute but fear that Google may interpret this as cloaking and penalize the website. Is there a good, clean, acceptable way to redirect real users away from the ugly URL if for some reason or another they end up arriving at the site that way?

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• Could someone explain in detail simplex /or perlin noise?

  - by Ryan Szemplinski

  I am really interested in perlin/simplex noise but I am having a difficult time understanding it. I am not very good at math but I am willing to learn because it interests me greatly. If someone is willing to dedicate there time into this I would be immensely appreciative of this. To be more concise, an explanation of functions and some calculation inside the functions would be nice to understand. Thanks in advance!

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• Is it best to try to work at a company where your software directly makes the company money?

  - by Ryan Hayes

  I was told once that the best place to work as a developer is a company where the software you write is what makes the company money, whether it be software production or software services like consulting. This is opposed to a company where the software you write is just to support some other part of the business that makes the money, like manufacturing or finance. I know there are always exceptions, but in general, are employees treated better if they are on the front lines of profit generation, as opposed to being just another cost center? cost center (n.) - A cost center is part of an organization that does not produce direct profit and adds to the cost of running a company. Examples of cost centers include research and development departments, marketing departments, help desks and customer service/contact centers.

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• Adsense ads are not a good fit for my site

  - by Ryan Grush

  I run an academic network for college students to communicate at particular universities and we run Google Adsense. The site pulls in a decent amount for a side project but our CTR is horrible <0.2% and our RPM is equally low. The problem lies in the fact that Google pegs us as an education site (which we are) but shows our users ads for U of Phoenix, Devry U and other for-profit universities. All of our users are students of the more higher-caliber institutions and therefore have no use for these ads. I've known about this problem for some time but I don't know what to do to show more relevant ads instead (i.e. Spring Break, school apparel, poker, sports, etc). What would be the best way to change this?

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• How can I find which "command" corresponds to opening a gnome-panel menu, for use in a keyboard shortcut?

  - by Ryan Jendoubi

  There are many questions and answers here and around the web on setting basic keyboard shortcuts in GNOME. Most of them are either for launching applications, or Compiz settings, or for changing defaults for other things for which Ubuntu provides defaults shortcuts. What I want to know though is how to refer to a gnome-panel menu item in a custom keyboard shortcut. I'm using Ubuntu 11.10 with GNOME Classic, and the old GNOME 2 / Ubuntu 10.04 keyboard shortcuts for the main menus (Alt-F1) and the "Me Menu" (Super+S) don't seem to work. So my question is two-fold. Primarily I'd like to know how to set those shortcuts. But a second-order question is how I could have found this out myself: is there some program I can use to see what signals or commands are fired off when I click on various things, in this case gnome-panel menu items? I'm interested in the broader question because I've sometimes wanted to set shortcuts for specific menus or menu items in GNOME 2, so a way to find out what command I need there would be useful. Give a man a rod, as they say :-) I've had a look at a good lot of keyboard shortcut and menu related items here to no avail. One somewhat relevant question is this one, but it's just a "how do I do it" question, and applies to Unity, not GNOME, although it would be great if whatever investigatory method answers this question might also apply under different desktops, like Unity. The answer to this question is essentially how I was doing it in 10.04 / GNOME 2, although the questioner's query isn't exactly addressed - how to get directly to "Broadcast" with a key combination. Again, it would be great if an answer delving into how such menus work and how they interact with the rest of the system would be applicable to pinpoint menu items.

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• Keyring no longer prompts for password when SSH-ing

  - by Lie Ryan

  I remember that I used to be able to do ssh [email protected] and have a prompt asks me for a password to unlock the keyring for the whole GNOME session so subsequent ssh wouldn't need to enter the keyring password any longer (not quite sure if this is in Ubuntu or other distro). But nowadays doing ssh [email protected] would ask me, in the terminal, my keyring password every single time; which defeats the purpose of using SSH keys. I checked $ cat /etc/pam.d/lightdm | grep keyring auth optional pam_gnome_keyring.so session optional pam_gnome_keyring.so auto_start which looks fine, and $ pgrep keyring 1784 gnome-keyring-d so the keyring daemon is alive. I finally found that SSH_AUTH_SOCK variable (and GNOME_KEYRING_CONTROL and GPG_AGENT_INFO and GNOME_KEYRING_PID) are not being set properly. What is the proper way to set this variable and why aren't they being set in my environment (i.e. shouldn't they be set in default install)? I guess I can set it in .bashrc, but then the variables would only be defined in bash session, while that is fine for ssh, I believe the other environment variables are necessary for GUI apps to use keyring.

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• Java is very slow on my laptop

  - by Ryan McClure

  I have 1.6.0_30 JRE on my 11.10 install. I have 3 GB of RAM and an Intel Core2 Duo CPU T6600 @ 2.20GHz × 2. Whenever I use my Java to play a game, the Java runs at about 4-5 FPS. When I used Windows, I found that I could get around 40 FPS. I'm not too terribly worried about this, but are there settings that I can tweak that I don't know about? If not, why is it that JRE Java can't do as much on Ubuntu as it can on Windows? Also, this may be related but I'm not too sure--My fan runs very fast when running a Java application. Is there a correlation?

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• I am trying to figure out the best way to understand how to cache domain objects

  - by Brett Ryan

  I've always done this wrong, I'm sure a lot of others have too, hold a reference via a map and write through to DB etc.. I need to do this right, and I just don't know how to go about it. I know how I want my objects to be cached but not sure on how to achieve it. What complicates things is that I need to do this for a legacy system where the DB can change without notice to my application. So in the context of a web application, let's say I have a WidgetService which has several methods: Widget getWidget(); Collection<Widget> getAllWidgets(); Collection<Widget> getWidgetsByCategory(String categoryCode); Collection<Widget> getWidgetsByContainer(Integer parentContainer); Collection<Widget> getWidgetsByStatus(String status); Given this, I could decide to cache by method signature, i.e. getWidgetsByCategory("AA") would have a single cache entry, or I could cache widgets individually, which would be difficult I believe; OR, a call to any method would then first cache ALL widgets with a call to getAllWidgets() but getAllWidgets() would produce caches that match all the keys for the other method invocations. For example, take the following untested theoretical code. Collection<Widget> getAllWidgets() { Entity entity = cache.get("ALL_WIDGETS"); Collection<Widget> res; if (entity == null) { res = loadCache(); } else { res = (Collection<Widget>) entity.getValue(); } return res } Collection<Widget> loadCache() { // Get widgets from underlying DB Collection<Widget> res = db.getAllWidgets(); cache.put("ALL_WIDGETS", res); Map<String, List<Widget>> byCat = new HashMap<>(); for (Widget w : res) { // cache by different types of method calls, i.e. by category if (!byCat.containsKey(widget.getCategory()) { byCat.put(widget.getCategory(), new ArrayList<Widget>); } byCat.get(widget.getCatgory(), widget); } cacheCategories(byCat); return res; } Collection<Widget> getWidgetsByCategory(String categoryCode) { CategoryCacheKey key = new CategoryCacheKey(categoryCode); Entity ent = cache.get(key); if (entity == null) { loadCache(); } ent = cache.get(key); return ent == null ? Collections.emptyList() : (Collection<Widget>)ent.getValue(); } NOTE: I have not worked with a cache manager, the above code illustrates cache as some object that may hold caches by key/value pairs, though it's not modelled on any specific implementation. Using this I have the benefit of being able to cache all objects in the different ways they will be called with only single objects on the heap, whereas if I were to cache the method call invocation via say Spring It would (I believe) cache multiple copies of the objects. I really wish to try and understand the best ways to cache domain objects before I go down the wrong path and make it harder for myself later. I have read the documentation on the Ehcache website and found various articles of interest, but nothing to give a good solid technique. Since I'm working with an ERP system, some DB calls are very complicated, not that the DB is slow, but the business representation of the domain objects makes it very clumsy, coupled with the fact that there are actually 11 different DB's where information can be contained that this application is consolidating in a single view, this makes caching quite important.

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• What's the best way to compare blocks in a matching game that can be multiple colors?

  - by Ryan Detzel

  I have a match 3-4 game and the blocks can be one of 7 colors. There are an addition 7 blocks that are a mix of the original 7 colors so for example there is a red and blue block and there is also a red/blue block which can be matched with either the red or the blue. My original thought is just to use binary operations so. int red = 0x000000001; int blue = 0x000000010; int redblue = 0x000000011; Then just do an & operation so see if they match. Does this sound like a decent plan or am I over complicating it? edit: Better yet so it's more readable. int red = 1; int blue = 2; int red_blue = 3; int yellow = 4; int red_yellow = 5; maybe as defines or static vars?

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