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• How to debug a fatal system crash - [graphical loop DOTA2]?

  - by Huw

  Whilst playing DOTA2, I occasionally and apparently randomly seem to be experiencing a fatal crash where the display freezes fixed and the audio loops over approx the last .5 of a second. Now, I'm interested in resolving this - but my trouble is I don't know where to start. The error appears non-reproducible (I've tried returning to games and deploying the same combination of events in hopes of pinning to to a certain shader etc), and I don't know which part of 'the stack' it might be coming from. Variables that occur to me: I custom build this system, did I do something wrong - is my PSU not providing enough power to the graphics card? I am running Steam and DOTA under Linux, could this new software have a bug Might it be something to do with my ATI Catalyst graphics drivers Is some other background process interfering I'm usually mid game when this occurs, so i quickly kill the power and reboot (when i'm lucky i can get back in with only 1-2 mins lost!). So my question here relates to logs. Where should I start to look or how might I set up logs to help me pin down a fatal crash of this kind by recording moments up to / before a crash and is this likely to be something I should push Steam to do, or is there something at a system level? Then perhaps I can return with a more specific question and perhaps even a bug report :) Many thanks in advance.

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• The Increasing Focus on Architecture

  - by Bob Rhubart

  If you follow my updates on Twitter or on the OTN ArchBeat page on Facebook you have probably noticed that I'm a regular reader of Joe McKendrick's SOA blog on ZDNet. Usually I'm content to simply share a link on my social networks when I find one of McKendrick's posts interesting. But with a recent post, In the cloud era, let's start calling IT what it is: 'Innovation Team', McKendrick hit on a point that warrants more than a quick link: "IT is no longer just a department full of people who code, build and maintain systems. IT is the business partner that plans and strategizes what types of technology solutions the business needs to move forward." Of course, what McKendrick is describing is an increased focus on architecture. Assuming that McKendrick's assessment is correct — and I do — that expanding focus, from coding, building, and maintaining systems to planning and strategizing technology solutions that serve the business, isn't limited to the organizational level. The individual roles within the IT organization will also have to shift to a more broadly architectural mindset. McKendrick's post references Dr. Irving Wladawsky-Berger's assessment of cloud computing as a critical "third model" of computing to emerge in the 50-year history of Information Technology. As computing itself evolves, the underlying roles that make computing possible must evolve accordingly. That evolution will be defined by an increased focus on architecture.

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• Blog Rebranding

  I have been spending more and more time on learning as much as I can on Agile Development and also have been fairly immersed in rolling out TFS 2010 in our environment.  I feel like it is time to talk about some of my experiences.  With that, I am rebranding my blog to focus on these topics.  I am going to start with a bunch of blogs on the process I have gone through getting TFS 2010 configured for our development teams. Last week, Brian Harry was in our office and gave a great talk on the improved tools in TFS 2010 and how Microsoft uses the tools internally.  I followed that up with a high-level overview of the improved out of the box process templates and the process to customize them.  I am definitely very excited about the new features in 2010 and hopefully will keep up my motivation to blog about it.  I am writing my first post right now about the process I went through to build a task progress report based on the user story progress report in the MSF for Agile Development template.  Stay tunedDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Bring on the Cheer, Oracle’s Q3 is Here

  - by Kristin Rose

  November is long gone and December is near… this must mean OPN’s Q2 Winter Wrap-Up is here! Listed below are just a few of the highlights from Oracle’s past three months… Yet another successful Oracle OpenWorld 2012 and the launch of our first ever Oracle PartnerNetwork Exchange program! Get the recap. Our exciting Java Embedded @ JavaOne event. Get the low-down here! The debut of our new Oracle Cloud programs for partners, which have already created some awesome buzz in the Channel. Check out the CRN article, and don’t forget to watch the Cloud Programs Overview video and visit our OPN Cloud Knowledge Zone! On the product front, Oracle’s Sun ZFS Storage Appliance was awarded the 2012 Tech Innovator and Enterprise App Award by CRN. Read the full article. Oracle partner, Hitachi Consulting, reached OPN’s premier Diamond Level status. Read more. Was Oracle part of your September, October or November highlights? If so, leave us a comment below, we’d love to feature your story! Also, don’t forget to share the love by re-tweeting this post on Twitter or “liking” this post on Facebook! Stay Warm, The OPN Communications Team 

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• 25 years old and considering a career change...possible? practical?

  - by mq330

  Hi all, I'm new to this site and new to programming as well. I've spent some time going through an intro cs book that uses python as the language of choice. I find the exercises interesting and engaging and I generally have had a favorable experience programming so far. I've gone through some of the basics with python like writing simple programs, basics of GUIs, manipulating strings, lists, defining functions, etc. And I've always loved technology. Although I've never done any real hardcore programming yet, I was inclined to building websites from a very young age but I never really developed my skills. Now, the thing is I'm 25, I have my bacholors in environmental studies and two masters degrees in urban planning and landscape architecture respectively. I know, it would be quite a departure to pursue a career in programming at this point. Currently, I'm working as a geographic information systems intern. I've taken some GIS classes and have a lot of experience with making maps, doing spatial analysis etc. So what I'm thinking is maybe I can learn some solid programming skills and apply these skills in the field of GIS. From what I've seen, .net languages are the norm in this arena. Could you perhaps provide some guidance to me in terms of what languages I should focus on or courses I should take at this point? What about for building web mapping applications? Also, I was thinking about getting a certificate in programming from a university extension program. Do you think it would be worth it? And furthermore, do you think potential employers would be interested in hiring someone like me (once I get a couple of languages down pretty well) as an intern or in an entry level position? I'll be living in the bay area so I feel that there should be decent opportunities even though I don't have a b.s. in cs.

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• Where is the best place to teach myself a language, and which one?

  - by Lorinda

  Hello, I do not know any programming languages at all. I will self teach myself and need to know the best place to do so where I can learn from a most basic level. Where is a great place to begin learning a language? What language is best to learn first? Is it silly to learn Ruby first? Here, I came across someone saying that learning some of the higher languages can make you 'lazy' if you learn them first. Like Ruby amongst others. For my first language, my husband is advising me to learn Ruby (for his own personal interests). However, I need some independent advice of how to get started and what language I should learn first. I will eventually learn Ruby and then Rails. Four months ago, my husband ordered a text of objective C because he thought he would take it on. I flipped through and it was clearly starting at a place more advanced than where I am coming from. I have dabbled with a Ruby tutorial and I don't get it. I get what I am putting in is what I get, but I don't understand what is leading up to that. I need to know ALL the rules first. I then looked up computer languages and stared researching binary code which helped a lot, but not where I want to start. I don't have a lot of time right now in my life (with four kids) to go back that far. If I were going to school, that would be different. Any advice you could give is most welcomed.

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• How are certain analytics metrics (time on site, etc.) usually distributed?

  - by a barking spider

  I'm not sure if I've come to the right place to ask this question, but I'm gathering some information for a research project. We're trying to design an experiment that'll heavily involve web analytics, and I'm trying to figure out some sensible values of mean +/- standard deviation for the following visitor-level (i.e., visitor 1 spends 2 minutes on site, visitor 2 spends 1 minute -- mean 1.5 +/- 0.71...) metrics: time spent on site page views If time allowed, we would put up the sites and gather the information ourselves, but we have a grant deadline coming up. I realize that even though these the distributions of these quantities are probably going to be heavily skewed towards zero, we'll need some reasonable figures or estimates of these figures in order to do sample size calculations, etc. Anyway, I'm not sure where else I'd turn, and I certainly have had a difficult time finding these values in the prior literature. If someone could direct me to a paper with the right information, or if you have these figures on hand (perhaps taken directly from your logs!) -- that would be amazing, and I'd love to hear from you. Thanks in advance, and even though I'm not allowed to reveal too much, rest assured that this info'll be applied towards a good cause :)

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• what's a good approach to working with multiple databases?

  - by Riz

  I'm working on a project that has its own database call it InternalDb, but also it queries two other databases, call them ExternalDb1 and ExternalDb2. Both ExternalDb1 and ExternalDb2 are actually required by a few other projects. I'm wondering what the best approach for dealing with this is? Currently, I've just created a project for each of these external databases and then generated Edmx and entities using the entity-framework approach. My thought was that I could then include these projects in any of my solutions that require access to these databases. Also, I don't have any separate business layers. I just have a solution like below: Project.Domain ExternalDb1Project.Domain ExternalDb2Project.Domain Project.Web So my Domain projects contain the data access as well as the POCOs generated by Entity Framework and any business logic. But I'm not sure if this is a good approach. For example if I want to do Validation in my Project.Domain on the entities in the InternalDb, it's fine. But if I want to do Validation for entities from either of the ExternalDbs, then I wonder where it should go? To be more specific, I retrieve Employees from ExternalDb1Project.Domain. However, I want to make sure they are Active. Where should this Validation go? How to architect a project like this at a high level? Also, I want to make sure that I use IoC for my data contexts so I can create Fakes when writing tests. I wonder where the interfaces for these various data contexts would reside?

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• Can anyone point me to some open source directX rendering engines or frameworks? [on hold]

  - by Jim

  I'm completely new to graphics API programmming, but not at all new to the theory and principle operation of game engines and rendering engines. That being said, I want to do some experiments of rendering very dense geometry scenes in a basic rendering engine or game engine. I don't need a lot of bells and whistles. What I need is enough control that I can implement my own scene graph algorithms and control the rendering pipeline very specifically. My ideal candidate engine would be either a rendering engine or game engine with a modular design that might be ready to go out of the box but would be simple enough in case I need to rip out some of the guts in the rendering management and implement my own. It's a tough call because I'm right at the level where it's almost better to go from scratch, but there's no sense in having to build every single basic thing such as heirarchical transforms, etc. I just want to work with rendering optimization to push dense geometry for maximum FPS. Does anyone have a suggestion for an engine or basic framework to use? I requested DirectX in my title because I figured it would likely be better supported and less likely for me to run into some obscure less-documented problem. But OpenGL might be acceptable if the recommended framework was definitely better than my other options. EDIT: I should add that I really want GPU tessellation support (part of adding to the density of geometry detail).

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• Will Unity skills be interchangeable?

  - by Starkers

  I'm currently learning Unity and working my way through a video game maths primer text book. My goal is to create a racing game for WebGL (using Three.js and maybe Physic.js). I'm well aware that the Unity program shields you from a lot of what's going on and a lot of the grunt work attached to developing even a simple video game, but if I power through a bunch of Unity tutorials, will a lot of the skills I learn translate over to other frameworks/engines? I'm pretty proficient at level design with WebGL, and I'm a good 3D modeller. My weaknesses are definitely AI and Physics. While I am rapidly shoring up my math, and while Physics is undeniably interesting there's only so many hours in the day and there's a wealth of engines out there to take care of this sort of thing. AI does appeal to me a lot more, and is a lot more necessary. AI changes drastically from game to game, is tweaked heavily during development, and the physics is a lot more constant. Will leaning AI concepts in Unity allow me to transfer this knowledge pretty much anywhere? Or will I just be paddling up Unity creek with these skills?

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• PARTNER News: Tips and Guidelines from Avago (formerly LSI)

  - by Zeynep Koch

  In this blog write-up we would like to focus our attention to one of our IHV partners, Avago (formerly LSI) . Avago and Oracle have been collaborating at many levels for many years.  At the lowest level, Avago and Oracle engineer solutions to inbox advanced features in our I/O device drivers.  We collaborate to test, verify and optimize these drivers in Oracle Linux with Unbreakable Enterprise Kernel. Both LSI Nytro and Sun F-Series PCIe flash devices are supported inbox in Oracle Linux with Unbreakable Enterprise Kernel. By collaborating early in the engineering design cycle we can find and resolve issues sooner and deliver to the end-customer a fully optimized platform for I/O efficiency and data protection.  Hear more about the partnership and benefits in this podcast  LSI and Oracle Partnership. Avago had also been working on technical whitepaper and video whiteboard to explain some of the optimizations you can achieve by using smart flash cache with Oracle Linux.  Technical Paper: Improve Database Performance Using Sun Flash Accelerator Card, Database Smart Flash Cache and Oracle Linux Video: Improving DB Performance with Database Smart Flash Cache If you want more information about the partnership and product benefits, you can visit the LSI Oracle alliance page. 

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• &quot;The protocol 'net.msmq' is not supported.&quot;

  - by John Breakwell

  The “Lessons Learned” blog has an update covering the error message "The protocol 'net.msmq' is not supported." "The protocol 'net.msmq' is not supported." OMG, a new lesson! Will wonders never cease? So I ran into an interesting issue setting up a WCF service to consume an MSMQ queue. I won't bother you with the details of how to actually build a WCF/MSMQ service; there are plenty of tutorials on the subject. I want to share with you an interesting error that I ran into and the surprisingly simple fix. The error occurs when attempting to generate a Service Reference or even simply browsing to the WSDL of your WCF/MSMQ service in the form of a YSOD with the following error: "The protocol 'net.msmq' is not supported." After a lot of Googling on the subject turning up plenty of questions with the same error but no answers. So I went digging into some application level config files on a server that already had a WCF/MSMQ service successfully set up by the network admin, and the answer was amazingly simple: If you are hosting an MSMQ/WCF service in IIS, you have to tell IIS to allow net.msmq protocol. It's in the advanced settings for the application or site in which you are hosting the service. .... aaaand, that's it.

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• How do I list all the relation variables and debug them interactively?

  - by mfisch

  I'm writing a charm that requires a mysql database, I found from looking at other charms that this (below) is how I get the info about the database: user=`relation-get user` password=`relation-get password` mysqlhost=`relation-get private-address` But I just found that from reading the wordpress charm example, is there a way to show all the relation variables that I can use? Also, while debugging my db-relation-changed script, I wanted to ssh into my host and interactively run those commands, for example relation-get user, but it didn't work. I resorted to having to restart everything and use juju log to print them out. This wasted a lot of time. Is there a way to print out these relations, either from my dev box or from the instance running my charm? (Below is what happens when I tried to interactively run relation-get): ubuntu@mfisch-local-tracks-0:~$ relation-get user usage: relation-get [-h] [-o OUTPUT] [-s SOCKET] [--client-id CLIENT_ID] [--format FORMAT] [--log-file FILE] [--log-level CRITICAL|DEBUG|INFO|ERROR|WARNING] [-r RELATION ID] [settings_name] [unit_name] No JUJU_AGENT_SOCKET/-s option found I tried juju debug-hooks tracks/0 -e local, that dropped me into a shell and relation-get still failed.

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• Can I set up samba so it automatically allows all the local usernames and passwords?

  - by dialer

  I have set up samba like this (this is the complete smb.conf): [global] log file = /var/log/samba/log log level = 2 security = user [homes] browsable = false read only = no valid users = %S I'd like to enable every user on server to access their home directories, but for some unknown reason only my 'administrator' account can do so. (I have done that with ftp before, but now smb is also needed). When I try to smbclient -L localhost -U [user], I get NT_STATUS_LOGON_FAILURE, except with the administrator (which is the user created during the ubuntu installation, not root). The samba log file says NT_STATUS_NO_SUCH_USER: [2012/04/04 20:26:02.081454, 2] smbd/reply.c:554(reply_special) netbios connect: name1=LOCALHOST 0x20 name2=DIALER-X 0x0 [2012/04/04 20:26:02.081733, 2] smbd/reply.c:565(reply_special) netbios connect: local=localhost remote=dialer-x, name type = 0 [2012/04/04 20:26:02.087200, 2] auth/auth.c:314(check_ntlm_password) check_ntlm_password: Authentication for user [public] - [public] FAILED with error NT_STATUS_NO_SUCH_USER I suspect that I have to manually create samba users, but the man pages state that If the client has passed a username/password pair and that username/password pair is validated by the UNIX system's password programs, the connection is made as that username. To me that sounds like as long as the provided username/password is a valid login on the server, it should work. Am I missing something totally obvious? I don't want / can't afford to manually update the samba users and passwords to match the server's. 11.10

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• Java and .NET cost of use [on hold]

  - by 1110

  I work with .NET technology stack for about 4 years. I am learning and enjoy working with ASP MVC framework and I never did anything serious in other languages. This is not the question like what is better (I read all similar questions). What interest me is the cost of switching. For example: If you are about to start a start-up company today and you are in my situation not too much money, some good idea that you think others will use and have a knowledge of .NET. In my head I have a few questions that I can't answer and I know that somebody with experience can: 1) Java & .NET hosting. Suppose shared hosting is not good enough anymore, your site has grown and you need more resources. How much Java services is cheaper compared to .NET? 2) I didn't follow hype about ORACLE will kill java long time. Does oracle show interest in investing in java. I mean is is safe to bet on java as a technology when starting start-up (basically did oracle show some will to destroy java platform)? 3) I am not sure what I am asking here. When you use Java you can use JEEE stack or Java with third party stack (spring, hibernate, maven etc.). I saw a lot of project that work with second option if web application is not enterprise level but social networking site for example which stack is best pick? Summary of this question is is it safe to jump in to Java learn it and build product based on it. It's not too hard for me to learn it. But how much can I get from it.

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• Eclipse and NetBeans replacing embedded IDEs (part 2 and part 3)

  - by Geertjan

  After part 1, in Embedded Insights, the series Eclipse and NetBeans replacing embedded IDEs by principal analyst Robert Cravotta continues below. Many embedded tool developers are choosing to migrate their embedded development toolset to an open source IDE platform for a number of reasons. Maintaining an up-to-date IDE with the latest ideas, innovations, and features requires continuous effort from the tool development team. In contrast to maintaining a proprietary IDE, adopting an open source IDE platform enables the tool developers to leverage the ideas and effort of the community and take advantage of advances in IDE features much sooner and without incurring the full risk of experimenting with new features in their own toolsets. Both the Eclipse and NetBeans platforms deliver regular releases that enable tool developers to more easily take advantage of the newest features in the platform architecture.  Read more of part 2 here, in an article published Thursday, May 17th, 2012. Both the NetBeans and Eclipse projects began as development environments and both evolved into platforms that support a wider array of software products. Both platforms have been actively supported and evolving open source projects that have competed and coexisted together for the past decade and this has led to a level a parity between the two platforms. From the perspective of a tool developer, applications are built the same way on either platform – the difference is in the specific terminology and tools. Read more of part 3 here, in an article published Tuesday, June 12th, 2012. And, as a bonus in this blog entry, here's how to get started creating an IDE on the NetBeans Platform:  http://netbeans.dzone.com/how-to-create-commercial-quality-ide

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• OBIEE 10g premier support ends Mid 2013

  - by THE

  To give all OBIEE users a fair warning ahead of time. Please be aware that the Premier Support product lifecycle for Oracle Business Intelligence Enterprise Edition and Oracle Business Intelligence Publisher 10.1.3.4.x is ending in July 2013 as of the  lifetime Support policy. Oracle Business Intelligence Enterprise Edition and Oracle Business Intelligence Publisher 10.1.3.4.x will be in Sustaining Support phase. "Sustaining Support" does NOT include: New program updates, fixes, security alerts, and critical patch updates New tax, legal and regulatory updates New upgrade scripts Certification with new third party products/versions 24 hour commitment and response guidelines for Severity 1 service requests as defined in the Severity Level section in the Oracle Technical Support Policies document linked below. We are encouraging you to move to OBIEE 11gR1. For more details please see the following documents on My Oracle Support ( https://support.oracle.com):"Premier Support Ends Dec 31 2011 for Oracle Fusion Middleware 10g 10.1.2 & 10.1.4" (  Doc ID 1290974.1)

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• How do I find actors in an area on a poly-precise basis?

  - by Almo

  Ok, I've been asking various questions and getting some good answers, but I think I need to rethink my method, so I'll describe the problem. I have a player who has a big blue box in front of him. This box shows which KActors will be pushed when he pulls the trigger: Currently, the blue box spawns a descendant of Actor which checks collision to see which KActors are touching it: foreach Owner.TouchingActors(class'DynamicSMActor', DynamicActorItt) { // do stuff } The problem is, if you check for touching between Actors and KActors, it looks like it does a plain axis-aligned bounding-box collision. The power will push the box on the lower right, when it's clear it's not touching the blue box. How should I do this properly? I just need a way to find out which KActors are touching that area, on a poly-by-poly level. These collisions are only done with rectangular boxes and simple sphere collision; we are aware of the potential for performance issues with complex objects and poly-collision. I've tried making the collision checker a KActor, but it doesn't report any TouchingActors. This issue is causing us trouble in a lot of other places as well. So solving this problem is a core issue in our game.

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• Writing generic code when your target is a C compiler

  - by enobayram

  I need to write some algorithms for a PIC micro controller. AFAIK, the official tools support either assembler or a subset of C. My goal is to write the algorithms in a generic and reusable way without losing any runtime or memory performance. And if possible, I would like to do this without increasing the development time much and compromising the readability and maintainability much either. What I mean by generic and reusable is that I don't want to commit to types, array sizes, number of bits in a bit field etc. All these specifications, IMHO, point to C++ templates, but there's no compiler for it for my target. C macro metaprogramming is another option, but, again my opinion, that greatly reduces readability and increases development time. I believe what I'm looking for is a decent C++ to C translator, but I'd like to hear anything else that satisfies the above requirements. Maybe a translator from another high-level language to C that produces very efficient code, maybe something else. Please note that I have nothing against C, I just wish templates were available in it.

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• How to Disable Touchpad tap in Toshiba Tecra R850 in Oneiric - it is recognized as a PS/2 mouse

  - by Kibi

  I know there's a lot of similar questions, but nothing I have tried here works yet - perhaps I was doing it wrong. New Laptop - Toshiba Tecra R850 with an install of Oneiric 64 bit. Mostly things are working well, but I have a problem with the touchpad (or whatever it's called) - whenever I use it for moving the mouse pointer I accidentally tap on it - basically I am clicking all over the place by accident. So I want to disable the tap-as-click (after all, I have buttons for clicks too). I open up "Mouse and Touchpad" and on the Touchpad tab I check "Disable touchpad when typing" and UNcheck "Enable mouse clicks with touchpad". This does not achieve anything. Ditto Synaptiks and other similar tools. EDIT OK it turns out that this is a somewhat known problem - it seems the touchpad is not being recognized as a touchpad, it is seen as a PS/2 mouse. So any adjustments made with various settings programs to the "touchpad" don't affect it. I've been looking at solutions for getting the touchpad correctly recognized and not achieved it yet - seems there is a problem at the kernel level...I tried (foolishly) a suggestion to replace the psmouse.ko driver ...this screwed some stuff up and didn't solve my problem. So - anyone know an answer? Thanks Kibi

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• Purpose oriented user accounts on a single desktop?

  - by dd_dent

  Starting point: I currently do development for Dynamics Ax, Android and an occasional dabble with Wordpress and Python. Soon, I'll start a project involving setting up WP on Google Apps Engine. Everything is, and should continue to, run from the same PC (running Linux Mint). Issue: I'm afraid of botching/bogging down my setup due to tinkering/installing multiple runtimes/IDE's/SDK's/Services, so I was thinking of using multiple users, each purposed to handle the task at hand (web, Android etc) and making each user as inert as possible to one another. What I need to know is the following: Is this a good/feasible practice? The second closest thing to this using remote desktops connections, either to computers or to VM's, which I'd rather avoid. What about switching users? Can it be made seamless? Anything else I should know? Update and clarification regarding VM's and whatnot: The reason I wish to avoid resorting to VM's is that I dislike the performance impact and sluggishness associated with it. I also suspect it might add a layer of complexity I wish to avoid. This answer by Wyatt is interesting but I think it's only partly suited for requirements (web development for example). Also, in reference to the point made about system wide installs, there is a level compromise I should accept as experessed by this for example. This option suggested by 9000 is also enticing (more than VM's actually) and by no means do I intend to "Juggle" JVMs and whatnot, partly due to the reason mentioned before. Regarding complexity, I agree and would consider what was said, only from my experience I tend to pollute my work environment with SDKs and runtimes I tried and discarded, which would occasionally leave leftovers which cause issues throught the session. What I really want is a set of well defined, non virtualized sessions from which I can choose at my leisure and be mostly (to a reasonable extent) safe from affecting each session from the other. And what I'm really asking is if and how can this be done using user accounts.

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• What helped YOU learn C++? [on hold]

  - by Tips48

  So here's my attempt to not get this question closed for too subjective :P I'm a young programmer, specifically interested in Game Development. I've written my first couple games in Java, which I would consider my self intermediate-Advanced in. As I start to prepare myself for college and (hopefully) internships, I've noticed that learning C/C++ is essential to the industry. I've decided to start with C++, and so I read a couple of books that I saw were suggested. Anyway, now I have a decent understanding of the basics, but I really want to enhance my language knowledge. Instead of just asking for things to do, I was wondering what were some exercises that you did that really helped you understand the language? Preferably they would be near the beginner level. I understand that they obviously won't be directly related to Game Development, but it be nice if there were some things that I could transfer over eventually. (Specifically, I struggle with memory (pointers, etc) since there is no such concept in Java) Thanks! - Tips P.S.: Here's to hoping this isn't to subjective :P

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• Role based access to resources for a RESTful service

  - by mutex

  I'm still wrapping my head around REST, but I wonder if someone can help with any suggestions or approaches to role based access control for a RESTful service, particularly from the point of view of securing the data and how the URLs might look. It's probably best to consider an example: Say I have a REST service for Customers, and want to split the users of this REST service into Admin, Editor and Reader roles: Admins can change all attributes of a Customer resource Editors can change only some Readers can only view them. Access control rights are assigned to the Customers entities individually. So for example a user of the service might have admin rights to Customers 1,2 and 3 but Editor access to 4,5 and Reader access to 7,8,9. Now consider the user calling the service. What is a good way to seperate the list of Customers for the current User? GET /Customer - this might get a list of all customers that the current user has Admin\Editor\Reader access to. But then on each Customer the consumer would need an indication of what role they have. Or would it be "better" having something like GET /Customer/Admin - return all customers the current user has Admin access to. Just looking for some high level pointers or reading on a decent way to secure\filter the resources based on roles of the current user.

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• Query for server DefaultData & DefaultLog folders

  - by jamiet

  Do you ever need to query for the DefaultData & DefaultLog folders for your SQL Server instance? Well, I just did and the following script enabled me to do that: DECLARE @HkeyLocal NVARCHAR(18),@MSSqlServerRegPath NVARCHAR(31),@InstanceRegPath SYSNAME; SELECT @HkeyLocal=N'HKEY_LOCAL_MACHINE' SELECT @MSSqlServerRegPath=N'SOFTWARE\Microsoft\MSSQLServer' SELECT @InstanceRegPath=@MSSqlServerRegPath + N'\MSSQLServer' DECLARE @SmoDefaultFile NVARCHAR(512) EXEC MASTER.dbo.xp_instance_regread @HkeyLocal, @InstanceRegPath, N'DefaultData', @SmoDefaultFile OUTPUT DECLARE @SmoDefaultLog NVARCHAR(512) EXEC MASTER.dbo.xp_instance_regread @HkeyLocal, @InstanceRegPath, N'DefaultLog', @SmoDefaultLog OUTPUT SELECT ISNULL(@SmoDefaultFile,N'') AS [DefaultFile],ISNULL(@SmoDefaultLog,N'') AS [DefaultLog]' I haven’t done any rigorous testing or anything like that, all I can say is…it worked for me (on SQL Server 2012). Use as you see fit. Doubtless this information exists in a multitude of other places but nevertheless I’m putting it here so I know where to find it in the future. Just for fun I thought I’d try this out against SQL Azure Windows Azure SQL Database. Unsurprisingly it didn’t work there: Msg 40515, Level 15, State 1, Line 16 Reference to database and/or server name in 'MASTER.dbo.xp_instance_regread' is not supported in this version of SQL Server. @Jamiet

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• Structuring Access Control In Hierarchical Object Graph

  - by SB2055

  I have a Folder entity that can be Moderated by users. Folders can contain other folders. So I may have a structure like this: Folder 1 Folder 2 Folder 3 Folder 4 I have to decide how to implement Moderation for this entity. I've come up with two options: Option 1 When the user is given moderation privileges to Folder 1, define a moderator relationship between Folder 1 and User 1. No other relationships are added to the db. To determine if the user can moderate Folder 3, I check and see if User 1 is the moderator of any parent folders. This seems to alleviate some of the complexity of handling updates / moved entities / additions under Folder 1 after the relationship has been defined, and reverting the relationship means I only have to deal with one entity. Option 2 When the user is given moderation privileges to Folder 1, define a new relationship between User 1 and Folder 1, and all child entities down to the grandest of grandchildren when the relationship is created, and if it's ever removed, iterate back down the graph to remove the relationship. If I add something under Folder 2 after this relationship has been made, I just copy all Moderators into the new Entity. But when I need to show only the top-level Folders that a user is Moderating, I need to query all folders that have a parent folder that the user does not moderate, as opposed to option 1, where I just query any items that the user is moderating. Thoughts I think it comes down to determining if users will be querying for all parent items more than they'll be querying child items... if so, then option 1 seems better. But I'm not sure. Is either approach better than the other? Why? Or is there another approach that's better than both? I'm using Entity Framework in case it matters.

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