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• SOA Community Newsletter November 2012

  - by JuergenKress

  Dear SOA partner community member Too many different product from Oracle, no idea how do they fit together? Get a copy of the Oracle catalog, an excellent overview of the Oracle middleware portfolio. BPM is a key solution to this portfolio. To position BPM to your customers you can find many use case ideas in the paper BPM 11g Patterns and industry specific value propositions for Financial Services & Insurance & Retail. Many more Process Accelerators (11.1.1.6.2) have become available. It is an excellent demo and starting point for BPM projects. Our SOA Suite team published the most important OOW presentation at the OTN website. The Oracle SOA proactive support team is running a series of blog posts about SOA and JMS Introductory. To become an expert in SOA, Bob highlighted the latest list of SOA books. For OSB projects we recommend the EAIESB OSB poster. Thanks to all the experts who contributed and shared their SOA & BPM knowledge this month again. Please feel free to send us the link to your blog post via twitter @soacommunity: Undeploy multiple SOA composites with WLST or ANT by Danilo Schmiedel Fault Handling Slides and Q&A by Vennester Installing Oracle Event Processing 11g by Antoney Reynolds Expanding the Oracle Enterprise Repository with functional documentation by Marc Kuijpers Build Mobile App for E-Business Suite Using SOA Suite and ADF Mobile By Michelle Kimihira A brief note for customers running SOA Suite on AIX platforms By Christian ACM - Adaptive Case Management by Peter Paul BPM 11g - Dynamic Task Assignment with Multi-level Organization Units By Mark Foster Oracle Real User Experience Insight: Oracle's Approach to User Experience Hope to see you at the Middleware Day at UK Oracle User Group Conference 2012 in Birmingham. Jürgen Kress Oracle SOA & BPM Partner Adoption EMEA To read the newsletter please visit http://tinyurl.com/soanewsNovember2012 (OPN Account required) To become a member of the SOA Partner Community please register at http://www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: SOA Community newsletter,SOA Community,Oracle SOA,Oracle BPM,BPM Community,OPN,Jürgen Kress

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• Little mysterious RowMatch

  - by kishore.kondepudi(at)oracle.com

  Incidentally this was the first piece of code i ever wrote in ADF.The requirement was we have tax rates which are read from a table.And there can be different type of tax rates called certificates or exceptions based on the rate_type column in the tax rates table.The simplest design i chose was to create an EO on the tax rates table and create two VO's called CertificateVO and ExceptionVO based on the same EO.So far so good.I wrote all the business logic in the EO and completed the model project.The CertificateVO has the query as select * from tax_rates TaxRateEO where rate_type='CERTIFICATE' and similary the ExceptionVO is also built.The UI is pretty simple and it has two tabs called Certificates and Exceptions and each table has a button to create a tax rate.The certificate tab is driven by CertificateVO and exception tab is driven by ExceptionVO.The CertificateVO has default value of rate_type set to 'CERTIFICATE' and ExceptionVO has default value of rate_type to 'EXCEPTION' to default values for new records.So far so good.But on running the UI i noticed a strange thing,When i create a new row in Certificate i see the same row in Exception too and vice-versa.i.e; what ever row i create in one VO it also appears in the second one although it shouldn't be.I couldn't understand the reason for behavior even though an explicit where clause is present.Digging through documentation i found that ADF doesnt apply the where clause to new rows instead it applies something called as RowMatch to them.RowMatch in simple terms is a where condition applied to the VO rows at runtime.Since we had both VO's based on the same EO we have the same entity cache.The filter factor for new rows to be shown in VO at runtime is actually RowMatch than the where clause defined in the VO.The default RowMatch is empty as a result any new row appears in both the VO's since its from same entity cache.The solution to this problem is to use polymorphic view objects which can do the row filter based on configuration or override the getRowMatch() method in the VOImpl and pass the custom where filter instead of default RowMatch.Eg:@Overridepublic RowMatch getRowMatch(){    return new RowMatch("rate_type='CERTIFICATE'");}similarly for ExceptionVO too.With proper RowMatch in place new rows will route themselves to appropriate VO.PS: The behavior(Same row pushed to both VO's from entity cache) is also called as ViewLink Consistency.Try it out!

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• How to safely backup MySQL using VSS-based backup solutions

  - by Rhyven

  One of my clients is running MySQL on a Windows Server 2008 system. Their regular backups are performed using StorageCraft's ShadowCopy, which uses the VSS service to perform backups of open files. Some investigation indicates that MySQL is not entirely VSS-aware, and that the tables need to be locked prior to the shadow operation, then unlocked afterwards. There is a post at http://forum.storagecraft.com/Community/forums/p/548/2702.aspx which indicates the steps that need to be performed, however the user had some difficulty in performing them and no follow up solution was ever posted. Specifically, they succeeded in writing a batch file to lock the database, however once the batch file returns from MySQL it drops the connection and thus relinquishes the lock. I'm looking for a method that I can send the MySQL command FLUSH TABLES WITH READ LOCK, then perform the backup, then send UNLOCK TABLES when the backup is complete. Alternatively, I can exclude the MySQL data storage folder from backup, and schedule a mysqldump backup into a folder that will then be backed up by VSS. Can I have some recommendations please?

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• Server not sending a SYN/ACK packet in response to a SYN packet

  - by jeff

  Using iptraf, tcpdump and wireshark I can see a SYN packet coming in but only the ACK FLAG is set in reply packet. I'm running Debian 5 with kernel 2.6.36 I've turned off window_scaling and tcp_timestamps, tcp_tw_recycle and tcp_tw_reuse: cat /etc/sysctl.conf net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_tw_reuse = 0 net.ipv4.tcp_window_scaling = 0 net.ipv4.tcp_timestamps = 0 I've attached an image of the wireshark output. http://imgur.com/pECG0.png Output to netstat netstat -natu | grep '72.23.130.104' tcp 0 0 97.107.134.212:18000 72.23.130.104:42905 SYN_RECV I've been doing everything possible to find a solution and have yet to figure out the problem, so any help/suggestions are much appreciated. UPDATE 1: I've set tcp_syncookies = 0 and noticed I am now replying with 1 SYN+ACK for every 50 SYN requests. The host trying to connect is sending a SYN request about once every second. PCAP FILE

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• bash disable line wrap without truncation

  - by Eric Huang

  I am using a template heavy library in c++ and need to understand the template errors. Reading line wrapped template errors is a serious pain. Is there a way to disable line wrapping in bash without also truncating the output. Additionally, is there a way to do horizontal scrolling on the output. I have seen this answer, how to make bash not to wrap output?, but the output is truncated. The solution doesn't have to be bash targeted, if there is method for this using another shell, tmux, piping make output to another program, compiling from within vim, etc, I'll use it. (Except for copy-pasting into gedit)

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• Do you know the minimum builds to create on any branch?

  - by Martin Hinshelwood

  You should always have three builds on your team project. These should be setup and tested using an empty solution before you write any code at all. Figure: Three builds named in the format [TeamProject].[AreaPath]_[Branch].[Gate|CI|Nightly] for every branch.   These builds should use the same XAML build workflow; however you may set them up to run a different set of tests depending on the time it takes to run a full build. Gate – Only needs to run the smallest set of tests, but should run most if not all of the Unit Test. This is run before developers are allowed to check-in CI – This should run all Unit Tests and all of the automated UI tests. It is run after a developer check-in. Nightly – The Nightly build should run all of the Unit Tests, all of the Automated UI tests and all of the Load and Performance tests. The nightly build is time consuming and will run but once a night. Packaging of your Product for testing the next day may be done at this stage as well. Figure: You can control what tests are run and what data is collected while they are running. Note: We do not run all the tests every time because of the time consuming nature of running some tests, but ALL tests should be run overnight. Note: If you had a really large project with thousands of tests including long running Load tests you may need to add a Weekly build to the mix.     Figure: Bad example, you can’t tell what these builds do if they are in a larger list   Figure: Good example, you know exactly what project, branch and type of build these are for.   Technorati Tags: SSW,SSW Rules,VS2010,VS ALM,Team Build 2010,Team Build

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• Can't install Parallels Tools on Debian 7.2.0

  - by jfm429

  (Parallels Desktop 9, latest version) As per instructions, I switch to root: $ su - root $ whoami root $ echo $EUID 0 and then execute the installer: $ cd /media/cdrom0 $ ./install and I get this error: sudo: unable to execute ./install: Permission denied What? I'm root! What's with this? I double check to make sure the execute bit is set: $ ls -lA | grep install$ -r-xr-xr-x 1 root root 17284 Oct 25 09:22 install Yep. People online are saying that you need to drag the install script to the terminal after typing sudo. So I do that, and this command is what's formed: $ sudo '/media/cdrom0/install' sudo: unable to execute /media/cdrom0/install: Permission denied What's the solution here?

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• Meta key in Terminal.app vs national characters

  - by yacoob

  I'm using Terminal.app, and I'd like to use emacs running inside - either locally, or after sshing to remote server. Problem is, I can't get working Meta modifier. Namely, if I enable 'Use option as meta key', Option key works like proper Meta, but I lose ability to enter Polish diacritics (aelósznzc), that are entered with right Option. If I disable 'Use option as meta key', my Meta is gone, but I can again use Polish characters. In this state they appear only with right Option modifier, so I guess it's Terminal.app's fault that it doesn't make a difference between left and right Option key, when the relevant preference is selected. What are my options then? Is there a good solution for my problem? I can always use ESC as a poor man's Meta replacement, but I don't like that idea.

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• Why does text look so Horrible in my HD monitor???

  - by Laura

  I just bought a 1080p 22" Samsung HD monitor (connected via HDMI) and the picture and video quality is great but the text quality is absolutely horrible. Even as I type now all the text in this text box as well as in the browser toolbar and start menu, etc looks weird - like it all has a white outline around it that makes it jagged and hard to read. It hurts my eyes just to look at it. I am running my PC in the suggested native resolution of 1920 by 1080, so what's the problem? Is this one of the unavoidable downsides of using a HD monitor? Is there a solution to the problem?

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• Renting linux server just to make backups of my personnal data ?

  - by Matthieu

  Hi all, I would like to be able to backup ALL my computers data on a Linux server. For now, I have a home server, but soon I will be travelling, without home (so no home server). I was thinking of renting a dedicated linux webserver, but this is expensive, and I don't need a fast machine "web-oriented" with mysql server and all, I just need a full SSH access (full control, and then I install my programs). Does "backup servers" exist ? Am I doing it wrong (maybe that is not a good solution) ? Note : I run Mac OS, Windows and Linux, I backup through rsync, I want full control on my backup, not an automated "magic" backup like MobileMe or anything like that. Edit : I need around 500Gb storage

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• Outlook receives winmail.txt attachment instead of Excel, PowerPoint or Word attachments from Lotus

  - by Philippe

  Ok so the title pretty much says it all. We are offering a Hosted Exchange solution for our customer. Everything is working fine except for one customer complaining that he is receiving winmail.dat or winmail.txt attachments instead of the actual Word Excel or PowerPoint attachments he should be receiving, only when these messages come from a specific European senders, that is using Lotus Notes. I know that usually the problem is coming from Outlook senders to other mail clients, but this is not the first they inform me of this but I can't find anything on the matter so far. Has anyone ever gotten and solved this problem? If not, does anyone have any idea regarding this? I had solved this problem a few months ago, by upgrading Outlook to SP2 and then uninstalling it using the Service Pack removing tool of Microsoft. It seems that only the latest SP1 version could work but not the SP2. The problem is that now nothing is working at all. Thank you for your help, Philippe

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• Load-balance with LAN and Wi-Fi

  - by Synox

  I have a Mac, which runs Mac OS X 10.6 or Ubuntu 9.10 or Windows XP (Multiboot). Solution can be for any of the systems, whatever works better. I have two ISPs, one can be accessed via Wi-Fi, one can be accessed via LAN. In Mac OS X I can define the priority, which network to choose first. But what I wish to do is to load-balance with both networks. I don't want to buy extra hardware. I have some unused Wi-Fi routers if this would help. Compiling and configuring programms in Linux is no problem for me.

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• Subscription based eCommerce Site selling Physical Goods

  - by Kash

  I want to implement a system where customers can buy physical products as subscription with recurring billing. Customers will come to my site, visit product page and buy stuff. They need to register an account before purchasing. After registration they will be forwarded to payment processor for payment and after successful payment they will be returned back to my site. Requirement: I dont want to use Paypal as a payment processor. It will be recurring payment on monthly, quarterly, bi-annual or annual basis. Customers can login to my site in order to view their Order History, Profile Management and can edit their Billing and/or Shipping details. Customers can cancel their Subscription any time after login to their account on my site. Plan: Currently I am using wordpress with WooCommerce plugin for eCommerce functionality. I am planning to use Amazon as a payment processor. I have searched WooCommerce Extension Drectory and found WC Subscription extension that can be used for my site. But I just confirmed from the Support WC Subscription only support recurring payment with Paypal and Stripe, no other payment processor is supported at the moment. Questions: According to my need, what will be the best solution? I am open to switch the platform from Wordpress to something else that can fulfill my requirement.

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• Using ctrl-arrow keys with PuTTY and screen

  - by kbosak

  I searched and couldn't find a solution for this anywhere. I'm using PuTTY from Windows to connect to various servers where I run bash and screen. It seems bash works fine with ctrl-arrow keys to jump word-to-word on the command line but within screen it's not working. Not in screen, ctrl-left sends "^[OC and ctrl-right is "^[OD". Within screen I instead get "^[[C" and "^[[D", which appears to be the codes for just the left/right arrow keys. Is there any way to get screen to recognize ctrl-arrow keys when using PuTTY? (FYI, I don't remember having this problem when using gnu-terminal in linux instead of PuTTY).

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• Github Project Wiki: separate page filename from page title

  - by Marko Apfel

  Starting Point In a former version of a project wiki on Github was a separation between the page filename and page title. So we build up our Wiki in a manner, that some well defined prefixes in the filename describe the overall context of the particular page. Sample: At the page themselves we used a title-tag on top of the page to get the title in the rendered HTML-page. Here “= Tabelle: Anhänge bzw. Attachments” for the page with filename “data+table+Attachment”. This was rendered as We see: there is a file “data+table+Attachment” and a title-tag “= Tabelle: Anhänge bzw. Attachments” as well as a rendering with the title “Tabelle: Anhänge bzw. Attachments”. This was fine. Problem Now the Github-Wiki uses the title of the page as the filename and vice versa. This ends up in a cluttered file system and also in suppressing titles in the page themselves. So this page renders to As we could see: the title tag “= Organisation: IT-Infrastruktur” is not more rendered. Instead the filename “organisation+IT Infrastructure” is choosen as the title for the page. That sucks. Solution I reported this by Github again and hope for a fix.

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• Non-Registry Fix for Secondary Mailboxes Sent Items

  - by Jai Kang

  There is a known issue with Outlook and Exchange where "secondary" mailboxes which are mounted in the same profile, e.g. "John Doe" + CorpMailbox1, CorpMailbox2, CorpMailbox3 will place "sent items" from the secondary mailboxes (e.g. CorpMailbox1) in the user's (e.g. "John Doe") Sent Items folder. There is a registry value (something like DelegateSentItems) to semi-fix this, but I'm looking for an Exchange-side solution. It seems like, at some point, an admin made CC rules to fix this, and for the mailboxes where I see a BCC rule: any item sent to [address] BCC to [address]. The behavior "fixes" the issue, but when I duplicate this work-around for new shared mailboxes, the email ends up in the Inbox and not the Sent Items for the shared mailbox. I don't believe there is any outlook/client-side shenanigans going on, as the intended behavior for the older mailboxes works for new PCs/Users (new imagse) without any Outlook Mailbox Rules.

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• How to create a fully functional server of own? [closed]

  - by Saransh Sharma

  Hi i am looking for various companies for cloud hosting and servers dedicated one but i am not pleased with service being provided in our country and don't wanna opt to other country rather then India,well and also looking in cost factor too....so what i am looking is to create our own server which we can manage basically its like we would create a server or a machine or a pc and make it online and will use it as a server Problem is we need fully managed solution and we are not getting it anywhere and we are a startup looking to save and create something new in server so guys is it possible to create a server a webserver with home/dedsktop pc PLease help Saransh sharma

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• traffic shaping for certain (local) users

  - by JMW

  Hello, i'm using ubuntu 10.10 i've a local backup user called "backup". :) i would like to give this user just a bandwidth of 1Mbit. No matter which software wants to connect to the network. this solution doesn't work: iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner 1001 -j MARK --set-mark 12 iptables -t mangle -A POSTROUTING -p tcp -m owner --uid-owner 1001 -j MARK --set-mark 12 tc qdisc del dev eth0 root tc qdisc add dev eth0 root handle 2 htb default 1 tc filter add dev eth0 parent 2: protocol ip pref 2 handle 50 fw classid 2:6 tc class add dev eth0 parent 2: classid 2:6 htb rate 10Kbit ceil 1Mbit tc qdisc show dev eth0 tc class show dev eth0 tc filter show dev eth0 does anyone know how to do it? thanks a lot in advance

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• Is there a SUPPORTED way to run .NET 4.0 applications natively on a Mac?

  - by Dan

  What, if any, are the Microsoft supported options for running C#/.NET 4.0 code natively on the Mac? Yes, I know about Mono, but among other things, it lags Microsoft. And Silverlight only works in a web browser. A VMWare-type solution won't cut it either. Here's the subjective part (and might get this closed): is there any semi-authoritative answer to why Microsoft just doesn't support .NET on the Mac itself? It would seem like they could Silverlight and/or buy Mono and quickly be there. No need for native Visual Studio; cross-compiling and remote debugging is fine. The reason is that where I work there is a growing amount of Uncertainty about the future which is causing a lot more development to be done in C++ instead of C#; brand new projects are chosing to use C++. Nobody wants to tell management 18–24 months from now "sorry" should the Mac (or iPad) become a requirement. C++ is seen as the safer option, even if it (arguably) means a loss in productivity today.

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• Is there a SUPPORTED way to run .NET 4.0 applications natively on a Mac?

  - by Dan

  What, if any, are the (Microsoft) supported options for running C#/.NET 4.0 code natively on the Mac? Yes, I know about Mono, but among other things, it lags Microsoft. And Silverlight only works in a web browser. A VMWare-type solution won't cut it either. Here's the subjective part (and might get this closed): is there any semi-authoritative answer to why Microsoft just doesn't support .NET on the Mac itself? It would seem like they could Silverlight and/or buy Mono and quickly be there. No need for native Visual Studio; cross-compiling and remote debugging is fine. The reason is that where I work there is a growing amount of Uncertainty about the future which is causing a lot more development to be done in C++ instead of C#; brand new projects are chosing to use C++. Nobody wants to tell management 18–24 months from now "sorry" should the Mac (or iPad) become a requirement. C++ is seen as the safer option, even if it (arguably) means a loss in productivity today.

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• Caveat utilitor - Can I run two versions of Microsoft Project side-by-side?

  - by Martin Hinshelwood

  A number of out customers have asked if there are any problems in installing and running multiple versions of Microsoft Project on a single client. Although this is a case of Caveat utilitor (Let the user beware), as long as the user understands and accepts the issues that can occur then they can do this. Although Microsoft provide the ability to leave old versions of Office products (except Outlook) on your client when you are installing a new version of the product they certainly do not endorse doing so. Figure: For Project you can choose to keep the old stuff   That being the case I would have preferred that they put a “(NOT RECOMMENDED)” after the options to impart that knowledge to the rest of us, but they did not. The default and recommended behaviour is for the newer version installer to remove the older versions. Of course this does not apply in the revers. There are no forward compatibility packs for Office. There are a number of negative behaviours (or bugs) that can occur in this configuration: There is only one MS Project In Windows a file extension can only be associated with a single program.  In this case, MPP files can be associated with only one version of winproj.exe.  The executables are in different folders so if a user double-clicks a Project file on the desktop, file explorer, or Outlook email, Windows will launch the winproj.exe associated with MPP and then load the MPP file.  There are problems associated with this situation and in some cases workarounds. The user double-clicks on a Project 2010 file, Project 2007 launches but is unable to open the file because it is a newer version.  The workaround is for the user to launch Project 2010 from the Start menu then open the file.  If the file is attached to an email they will need to first drag the file to the desktop. All your linked MS Project files need to be of the same version There are a number of problems that occur when people use on Microsoft’s Object Linking and Embedding (OLE) technology.  The three common uses of OLE are: for inserted projects where a Master project contains sub-projects and each sub-project resides in its own MPP file shared resource pools where multiple MPP files share a common resource pool kept in a single MPP file cross-project links where a task or milestone in one MPP file has a  predecessor/successor relationship with a task or milestone in a different MPP file What I’ve seen happen before is that if you are running in a version of Project that is not associated with the MPP extension and then try and activate an OLE link then Project tries to launch the other version of Project.  Things start getting very confused since different MPP files are being controlled by different versions of Project running at the same time.  I haven’t tried this in awhile so I can’t give you exact symptoms but I suspect that if Project 2010 is involved the symptoms will be different then in a Project 2003/2007 scenario.  I’ve noticed that Project 2010 gives different error messages for the exact same problem when it occurs in Project 2003 or 2007.  -Anonymous The recommendation would be either not to use this feature if you have to have multiple versions of Project installed or to use only a single version of Project. You may get unexpected negative behaviours if you are using shared resource pools or resource pools even when you are not running multiple versions as I have found that they can get broken very easily. If you need these thing then it is probably best to use Project Server as it was created to solve many of these specific issues. Note: I would not even allow multiple people to access a network copy of a Project file because of the way Windows locks files in write mode. This can cause write-locks that get so bad a server restart is required I’ve seen user’s files get write-locked to the point where the only resolution is to reboot the server. Changing the default version to run for an extension So what if you want to change the default association from Project 2007 to Project 2010?   Figure: “Control Panel | Folder Options | Change the file associated with a file extension” Windows normally only lists the last version installed for a particular extension. You can select a specific version by selecting the program you want to change and clicking “Change program… | Browse…” and then selecting the .exe you want to use on the file system. Figure: You will need to select the exact version of “winproj.exe” that you want to run Conclusion Although it is possible to run multiple versions of Project on one system in the main it does not really make sense.

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• Sane(r) way to get character-encoding of CLI?

  - by danyowdee

  Hi all! I was writing a CLI-Tool for Mac OS X (10.5+) that has to deal with command-line arguments which are very likely to contain non-ASCII characters. For further processing, I convert these arguments using +[NSString stringWithCString:encoding:]. My problem is, that I couldn't find good information on how to determine the character-encoding used by the shell in which said cli-tool is running in. What I came up with as a solution is the following: NSDictionary *environment = [[NSProcessInfo processInfo] environment]; NSString *ianaName = [[environment objectForKey:@"LANG"] pathExtension]; NSStringEncoding encoding = CFStringConvertEncodingToNSStringEncoding( CFStringConvertIANACharSetNameToEncoding( (CFStringRef)ianaName ) ); NSString *someArgument = [NSString stringWithCString:argv[someIndex] encoding:encoding]; I find that a little crude, however -- which makes me think that I missed out something obvious...but what? Is there a saner/cleaner way of achieving essentially the same? Thanks in advance D

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• Domain forwarding to a IE "trusted site" opens a blank page

  - by Michael Jasper

  My employer, a University, regularly hosts conferences and other events. While websites for these sites are hosted on our domain, they frequently request customized .com urls. We then forward these domains to the specific site. Recently, we discovered a problem, where a page will not load if the following conditions are met(using a current example): website is created on our CMS for a conference http://continue.weber.edu/nulc a domain is created http://www.nulc2012.com and forwarded to http://continue.weber.edu/nulc The user enters http://www.nulc2012.com into their address bar using IE7 or IE8 The user has *.weber.edu listed as a "trusted site" in IE security settings (the case for nearly all on-campus computers) When this happens, their browser will correctly transfer to the page http://continue.weber.edu/nulc/index.php, however the page is blank, returning only: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=windows-1252" http-equiv=Content-Type></HEAD> <BODY></BODY></HTML> Is there any know solution to this problem? Or am I missing something completely? Note: Tested websites do load correctly in Chrome, Firefox, and Safari

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• 2D platformers: why make the physics dependent on the framerate?

  - by Archagon

  "Super Meat Boy" is a difficult platformer that recently came out for PC, requiring exceptional control and pixel-perfect jumping. The physics code in the game is dependent on the framerate, which is locked to 60fps; this means that if your computer can't run the game at full speed, the physics will go insane, causing (among other things) your character to run slower and fall through the ground. Furthermore, if vsync is off, the game runs extremely fast. Could those experienced with 2D game programming help explain why the game was coded this way? Wouldn't a physics loop running at a constant rate be a better solution? (Actually, I think a physics loop is used for parts of the game, since some of the entities continue to move normally regardless of the framerate. Your character, on the other hand, runs exactly [fps/60] as fast.) What bothers me about this implementation is the loss of abstraction between the game engine and the graphics rendering, which depends on system-specific things like the monitor, graphics card, and CPU. If, for whatever reason, your computer can't handle vsync, or can't run the game at exactly 60fps, it'll break spectacularly. Why should the rendering step in any way influence the physics calculations? (Most games nowadays would either slow down the game or skip frames.) On the other hand, I understand that old-school platformers on the NES and SNES depended on a fixed framerate for much of their control and physics. Why is this, and would it be possible to create a patformer in that vein without having the framerate dependency? Is there necessarily a loss of precision if you separate the graphics rendering from the rest of the engine? Thank you, and sorry if the question was confusing.

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• Single Responsibility Principle - How Can I Avoid Code Fragmentation?

  - by Dean Chalk

  I'm working on a team where the team leader is a virulent advocate of SOLID development principles. However, he lacks a lot of experience in getting complex software out of the door. We have a situation where he has applied SRP to what was already quite a complex code base, which has now become very highly fragmented and difficult to understand and debug. We now have a problem not only with code fragmentation, but also encapsulation, as methods within a class that may have been private or protected have been judged to represent a 'reason to change' and have been extracted to public or internal classes and interfaces which is not in keeping with the encapsulation goals of the application. We have some class constructors which take over 20 interface parameters, so our IoC registration and resolution is becoming a monster in its own right. I want to know if there is any 'refactor away from SRP' approach we could use to help fix some of these issues. I have read that it doesn't violate SOLID if I create a number of empty courser-grained classes that 'wrap' a number of closely related classes to provide a single-point of access to the sum of their functionality (i.e. mimicking a less overly SRP'd class implementation). Apart from that, I cannot think of a solution which will allow us to pragmatically continue with our development efforts, while keeping everyone happy. Any suggestions ?

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