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• Everybody's Heard About the Bird: OTN ArchBeat Top Tweets for June 2013

  - by Bob Rhubart

  Your clicks count! Here at the Top 10 most popular tweets for June 2013 from @OTN ARchBeat on Twitter. Oracle #SOA Suite 11g Developers Cookbook Published | Antony Reynolds Jun 28, 2013 at 12:25 PM Notes on Oracle #BPM PS6 Adaptive Case Management | Graeme Colman Jun 24, 2013 at 11:55 AM Calling #ADF BC Web Service from #BPM Process | @AndrejusB Jun 24, 2013 at 12:12 PM ZDNet's @JoeMcKendrick interviews #SOA guru and author Thomas Erl (@soaschool). Jun 25, 2013 at 08:33 AM Two Weeks and counting: OTN Architect Day: Cloud Computing - July 9 - Redwood Shores, CA. Registration is free. Jun 25, 2013 at 06:00 PM Changing #WebLogic Server Deployment Order using #MBeans | @ArtofBI Jun 24, 2013 at 12:07 PM Getting Started with #WebCenter Portal — Content Contribution Project — Part 2 | Husain Dalal #fusionmiddleware Jun 24, 2013 at 09:58 AM Your next boss may not be the CIO, or any other IT manager for that matter | ZDNet Jun 25, 2013 at 02:00 PM Single Sign-On with Security Assertion Markup Language between Oracle and SAP | Ronaldo Fernandes Jun 26, 2013 at 04:08 PM RT @oracletechnet: It's Not TV, It's OTN: Top 10 Videos on the OTN YouTube Channel Jun 27, 2013 at 09:06 AM Thought for the Day "At some point you have to decide whether you're going to be a politician or an engineer. You cannot be both. To be a politician is to champion perception over reality. To be an engineer is to make perception subservient to reality. They are opposites. You can't do both simultaneously. " — H. W. Kenton Source: softwarequotes.com

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• Can you point me to a nontrivial strategy pattern implementation?

  - by Eugen Martynov

  We are faced implementing a registration workflow with many branches. There are three main flows which in some conditions lead to one another. Each flow has at least four different steps; some steps interact with the server, and every step adds more information to the state. Also the requirement is to have it persistent between sessions, so if the user closes the app (this is a mobile app), it will restore the process from the last completed step with the state from the previous session. I think this could benefit from the use of the strategy pattern, but I've never had to implement it for such a complex case. Does anyone know of any examples in open source or articles from which I could find inspiration? Preferably the examples would be from a live/working/stable application. I'm interested in Java implementation mostly; we are developing for Java mobile phones: android, blackberry and J2ME. We have an SDK which is quite well separated from platform specific implementations, but examples in C++, C#, Objective-C or Python would be acceptable.

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• Energy Firms Targetted for Sensitive Documents

  - by martin.abrahams

  Numerous multinational energy companies have been targeted by hackers who have been focusing on financial documents related to oil and gas field exploration, bidding contracts, and drilling rights, as well as proprietary industrial process documents, according to a new McAfee report. "It ... speaks to quite a sad state of our critical infrastructure security. These were not sophisticated attacks ... yet they were very successful in achieving their goals," said Dmitri Alperovitch, McAfee's vice president for threat research. Apparently, the attacks can be traced back over several years, creating a sustained security compromise that has provided access to highly sensitive information that is of huge financial value to competitors. The value of IRM as an additional layer of protection is clear. Whether your infrastructure security is in a sad state or is state of the art, breaches are always a possibility - and in any case, a lot of sensitive information is shared with third parties whose infrastructure security might not be as good as yours. IRM protects the individual information assets directly so that, even if infrastructure security is compromised, your critical information is enrypted and trackable and only accessible to authenticated, authorised, audited users. The full McAfee report is available here.

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• compile error in Ubuntu 10

  - by yozloy

  Hey guys I got a vps which run solusVM. I'm now trying to install ruby 1.9.2 in it. I follow this guide: after I run this command apt-get update apt-get -y install build-essential zlib1g zlib1g-dev libxml2 libxml2-dev libxslt-dev I got this error below root@makserver:/usr/local/src/ruby-1.9.2-p0# apt-get -f install Reading package lists... Done Building dependency tree... Done Correcting dependencies... Done The following extra packages will be installed: libc6 Suggested packages: glibc-doc The following packages will be upgraded: libc6 1 upgraded, 0 newly installed, 0 to remove and 80 not upgraded. Need to get 0B/4252kB of archives. After this operation, 4096B disk space will be freed. Do you want to continue [Y/n]? y debconf: apt-extracttemplates failed: Bad file descriptor (Reading database ... 21594 files and directories currently installed.) Preparing to replace libc6 2.11.1-0ubuntu7.2 (using .../libc6_2.11.1-0ubuntu7.8_amd64.deb) ... open2: fork failed: Cannot allocate memory at /usr/share/perl5/Debconf/ConfModule.pm line 59 dpkg: error processing /var/cache/apt/archives/libc6_2.11.1-0ubuntu7.8_amd64.deb (--unpack): subprocess new pre-installation script returned error exit status 12 Errors were encountered while processing: /var/cache/apt/archives/libc6_2.11.1-0ubuntu7.8_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) Anybody can tell me how can I correct this. Thanks

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• How do I enable a disabled Event Notification.

  - by Derick Mayberry

  I have a scenerio where I am using external notification to process documents being sent in from the entire navy fleet, normally I have no problems, but just a few days ago an administrator changed passwords and I my queue processing failed and I rolled back the transaction with this C# code: catch (Exception) { TransporterService.WriteEventToWindowsLog(AppName, "Rolling Back Transaction:", ERROR); broker.Tran.Rollback(); break; } after which my target queue would continue to fill up but nothing to the external activation queue. Does the Event Notification get disabled once a transaction is rolled back? Should I have done a broker.EndDialog here when catching my exception? Also, after my event notification is disabled(if that is actually whats happening) how do I re engage it? Do I have to drop it and recreate it? Thank in advance for any help, I love Service Broker and its workign wonderfully except for this bug that I hope to fix soon.

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• Cannot terminate proces: access is denied

  - by jao

  Skype and Spotify remain active after I close them. When I try to close them via Task Manager Details End Task, I get the following error: The operation could not be completed. Access is denied. So I have to reboot to get rid of these programs or to log in to Skype again. Also, running a CMD as administrator and executing taskkill /f /im skype.exe results in an Access is denied error. What is going on? (this is Windows 8 RTM x64) update I have to kill skype.exe because it crashed and when I restart skype, I get the following error: It says: Could not open Skype, you are already signed in on this computer. update 2 The process is owned by my own username.

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• Switch or a Dictionary when assigning to new object

  - by KChaloux

  Recently, I've come to prefer mapping 1-1 relationships using Dictionaries instead of Switch statements. I find it to be a little faster to write and easier to mentally process. Unfortunately, when mapping to a new instance of an object, I don't want to define it like this: var fooDict = new Dictionary<int, IBigObject>() { { 0, new Foo() }, // Creates an instance of Foo { 1, new Bar() }, // Creates an instance of Bar { 2, new Baz() } // Creates an instance of Baz } var quux = fooDict[0]; // quux references Foo Given that construct, I've wasted CPU cycles and memory creating 3 objects, doing whatever their constructors might contain, and only ended up using one of them. I also believe that mapping other objects to fooDict[0] in this case will cause them to reference the same thing, rather than creating a new instance of Foo as intended. A solution would be to use a lambda instead: var fooDict = new Dictionary<int, Func<IBigObject>>() { { 0, () => new Foo() }, // Returns a new instance of Foo when invoked { 1, () => new Bar() }, // Ditto Bar { 2, () => new Baz() } // Ditto Baz } var quux = fooDict[0](); // equivalent to saying 'var quux = new Foo();' Is this getting to a point where it's too confusing? It's easy to miss that () on the end. Or is mapping to a function/expression a fairly common practice? The alternative would be to use a switch: IBigObject quux; switch(someInt) { case 0: quux = new Foo(); break; case 1: quux = new Bar(); break; case 2: quux = new Baz(); break; } Which invocation is more acceptable? Dictionary, for faster lookups and fewer keywords (case and break) Switch: More commonly found in code, doesn't require the use of a Func< object for indirection.

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• ArchBeat Link-o-Rama for 10-19-2012

  - by Bob Rhubart

  One Week to Go: OTN Architect Day Los Angeles - Oct 25 Oracle Technology Network Architect Day in Los Angeles happens in one week. Register now to make sure you don't miss out on a rich schedule of expert technical sessions and peer interaction covering the use of Oracle technologies in cloud computing, SOA, and more. Even better: it's all free. Register now! When: October 25, 2012, 8:30am - 5:00pm. Where: Sofitel Los Angeles, 8555 Beverly Boulevard, Los Angeles, CA 90048. Moving your APEX app to the Oracle Cloud | Dimitri Gielis Oracle ACE Director (and OSN Developer Challenge co-winner) Dimitri Gielis shares the steps in the process as he moves his "DGTournament" application, along with all of its data, onto the Oracle Cloud. A brief note for customers running SOA Suite on AIX platforms | A-Team - SOA "When running Oracle SOA Suite with IBM JVMs on the AIX platform, we have seen performance slowdowns and/or memory leaks," says Christian, an architect on the Oracle Fusion Middleware A-Team. "On occasion, we have even encountered some OutOfMemoryError conditions and the concomittant Java coredump. If you are experiencing this issue, the resolution may be to configure -Dsun.reflect.inflationThreshold=0 in your JVM startup parameters." Introducing the New Face of Fusion Applications | Misha Vaughan Oracle ACE Directors Debra Lilly and Floyd Teter have already blogged about the the new face of Oracle Fusion Applications. Now Applications User Experience Architect Misha Vaughan shares a brief overview of how the Oracle Applications User Experience (UX) team developed the new look. ADF Essentials Security Implementation for Glassfish Deployment | Andrejus Baranovskis According to Oracle ACE Director Andrejus Baranovskis, Oracle ADF Essentials includes all the key ADF technologies, save one: ADF Security. In this post he illustrates a solution for filling that gap. Thought for the Day "Why are video games so much better designed than office software? Because people who design video games love to play video games. People who design office software look forward to doing something else on the weekend." — Ted Nelson Source: softwarequotes.com

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• local install of wp site brought down from host - home page is ok but other pages redirect to wamp config page

  - by jeff

  local install of wp site brought down from host - home page is ok but other pages redirect to wamp config page. I got all local files from host to www dir under local wamp. I got database from host and loaded to new local db and used this tool to adjust site_on_web.com to "localhost/site_on_local" now the home page works great and can login to admin page but when click on reservations page and others of site then site just goes to the wamp server config page even though the url shows correctly as localhost/site_on_local/reservations my htaccess file is this # BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule> # END WordPress and rewrite-module is checked in the php-apache-apache modules setting. now when I uncheck the rewrite-module is checked in the php-apache-apache modules setting or I clear out the whole htaccess file then the pages just goto Not Found The requested URL /ritas041214/about-ritas/ was not found on this server. Please help as I am unsure now about my process to move local site up and down and be able to make it work and without this I am lost...

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• Unattended install of IIS 6 with PHP / FastCGI

  - by Ciaran

  I'm trying to figure out the best method of installing PHP on IIS 6 unattended. I've figured that to install IIS 6 unattended I need to use sysocmgr and modify a registry key before hand to point at the correct sources folder to prevent being asked for an installation disc. The bit I'm caught up on at the moment is the process of installing FastCGI. The info I've read about installing FastCGI so far is that the installer unpacks 3 files and "registers" them with IIS. Question is, does anyone know what happens with these three files so I can handle it without using the installer? Also, if anyone has experience with the steps I need to take following the FastCGI install, I'd appreciate help.

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• Strategy for backwards compatibility of persistent storage

  - by Baqueta

  In my experience, trying to ensure that new versions of an application retain compatibility with data storage from previous versions can often be a painful process. What I currently do is to save a version number for each 'unit' of data (be it a file, database row/table, or whatever) and ensure that the version number gets updated each time the data changes in some way. I also create methods to convert from v1 to v2, v2 to v3, and so on. That way, if I'm at v7 and I encounter a v3 file, I can do v3-v4-v5-v6-v7. So far this approach seems to be working out well, but I haven't had to make use of it extensively yet so there may be unforseen problems. I'm also concerned that if the objects I'm loading change significantly, I'll either have to keep around old versions of the classes or face updating all my conversion methods to handle the new class definition. Is my approach sound? Are there other/better approaches I could be using? Are there any design patterns applicable to this problem?

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• On RouterOS, how will transparent proxying (with DNAT) affect reporting of netflows?

  - by Tim

  I have a box running Mikrotik RouterOS, which is set up to do transparent web proxying, as described here. In short, this means that I have a firewall rule for destination NAT causing any port 80 traffic to get redirected to port 8080 on the router, which is received by the Mikrotik local web proxy. The local web proxy then makes the web request on the client's behalf, in this case to a parent web proxy server (which in turn does the real web request). My question is, how will this two-part process get reported in the logging of traffic flow information (netflows)? Looking at the logged information, what I seem to be seeing is this: One flow recorded from client machine (private IP) to remote proxy (8080) Another flow recorded from router to remote proxy (8080) The original request that the client made to port 80 isn't recorded. I want to write code to analyse traffic usage, so I want to be sure I'm not losing information if I discard the latter of these.

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• Ubuntu doesn't boot due to GRUB-Problems

  - by Dave

  Users out there, I came here with the spark of a hope, that you could help me. I want to get rid of my old WinXP, because the Game-Support for it seems to slowly expire now... So I took a second drive, just an old empty one I had at hands (ATA-Maxtor 90648D3), plugged of the other drive with WinXP, so that it couldn't be harmed, and started the installationof Ubuntu 12.04. Everything went as it was supposed to, until the end. Normal shutdown after successful installation process. But when I tried to boot my new Ubuntu from the HDD, it said: error: out of disk. grub rescue> So, what to do now? I already tried a lot of things in the terminal, e.g. the update-grub as mentioned on http://opensource-sidh.blogspot.de/2011/06/recover-grub-live-ubuntu-cd-pendrive.html. Everything worked, he didn't complain about a missing data or anything, but at the end of the day he still wasn't able to boot! Next step was to change the etc/default/grub-file, so that it could load the ATA-drivers first, so that there is now problem with my drive. But even this didn't seem to have any effect, I'm still stuck with Ubuntu in the Live-CD-Mode... If there was anybody to help me out there, I would be very glad. Thanks for any support, Dave P.S.: I even tried to fix it with boot-repair, a small tool for Ubuntu, and it created a file with data that could probably help you to help me. You can find it on http://paste.ubuntu.com/1428022/

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• Legal issues regarding embedding a toolbar into a browser [closed]

  - by OmarOthman

  We are in the process of developing a software that provides service to internet users and we would like to ask about the legal liabilities of some issues. Of course, everything is to be done with the consent of the user of our software but our concern is about third party tools and services that may be invoked/used by our product. In particular, these are the concerns: (1) Embedding a toolbar to an existing browser. This screenshot is an example, where the words in the highlighted toolbar are passed to www.google.com for searching, and the contents of the window are the results of the search. I want to know if any consent should be obtained before such a toolbar can be embedded in a web browser, whether there are any legal requirements by the web browser; whether different web browsers have different requirements (at least for Internet Explorer, Firefox, Chrome, Opera and Safari). (2) Invoking a free website from that toolbar (like Google’s search page). The screenshot above demonstrates such an existing toolbar. (3) Full ownership and unrestricted access to the data entered to this toolbar. In the screenshot above, I want to take the words (translation english to spanish) and own them, i.e. storing them in my database and do some processing on them. (4) Ability to track the pages entered by the user starting from that free website. In the screenshot above, you can notice that the user opted only for the third result, whose URL is translate.google.com. I want to have access to this and all URLs clicked from this page for some processing as well. This is a commercial application, so I need a very concrete, precise and reference-supported answer.

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• How to manage drawing loop when changing render targets

  - by George Duckett

  I'm managing my game state by having a base GameScreen class with a Draw method. I then have (basically) a stack of GameScreens that I render. I render the bottom one first, as screens above might not completely cover the ones below. I now have a problem where one GameScreen changes render targets while doing its rendering. Anything the previous screens have drawn to the backbuffer is lost (as XNA emulates what happens on the xbox). I don't want to just set the backbuffer to preserve its contents as I want this to work on the xbox as well as PC. How should I manage this problem? A few ideas I've had: Render every GameScreen to its own render target, then render them all to the backbuffer. Create some kind of RenderAction queue where a game screen (and anything else I guess) could queue something to be rendered to the back buffer. They'd render whatever they wanted to any render target as normal, but if they wanted to render to the backbuffer they'd stick that in a queue which would get processed once all rendertarget rendering was done. Abstract away from render targets and backbuffers and have some way of representing the way graphics flows and transforms between render targets and have something manage/work out the correct rendering order (and render targets) given what rendering process needs as input and what it produces as output. I think each of my ideas have pros and cons and there are probably several other ways of approaching this general problem so I'm interested in finding out what solutions are out there.

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• What .NET objects should I use to create a cookie based session in MVC?

  - by makerofthings7

  I'm writing a custom password reset application that uses a validation technique that doesn't fit cleanly with ASP.NET Membership Provider's challenge questions. Namely I need to invoke a workflow and collect information from the end user (backup phone number, email address) after the user logs in using a custom form. The only way I know to create a cookie-based session (without too much "innovation" on my part) is to use WIF. What other standard objects can I use with ASP.NET MVC to create an authenticated session that works with non-windows user stores? Ideally I can store "role" or claim information in the session object such as "admin", "departmentXadmin", "normalUser", or "restrictedUser" The workflow would look like this: User logs in with username and password If the username and pw are correct a (stateless) cookie based session is created The user gets redirected to a HTML form that allows them to enter their backup phone number (for SMS dual factor), or validate it if already set. The user can then change their password using the form provided The "forgot password" would look like this User requests OTP code to be sent to the phone User logs in using username and OTP If the OTP is valid and not expired then create a cookie based session and redirect to a form that allows password reset Show password reset form, and process results.

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• Can I make ssh tell me which control file it would use for multiplexing?

  - by Ryan Thompson

  I am using the following options in my ~/.ssh/config in order to enable connection multiplexing: ControlMaster auto ControlPath ~/.ssh/control/master-%r@%h:%p However, this has the annoying problem that the first shell to connect to a particular server must be the last to disconnect, because it is the master connection that all the other connections are using. So if you log out of the master, it appears to just hang. To solve this, I would like to wrap ssh with a script that checks if the control master file exists, and if not, starts a master ssh process in the background. Then it would start a slave ssh session. In order to accomplish this, my script would have to determine the path to the control file that ssh would use. This would entail parsing the ssh command line options and config files and implementing the logic for determining the ControlPath. Is there any way to just ask ssh what path it would use, so I can check it?

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• Inspiring the method of teaching. Example- C++ :)

  - by Ashwin

  A year ago I graduated with a degree in Computer Science and Engineering. Considering C++ as the first choice of programming language I have been in the process of learning C++ in many ways. At first - five years back - I had many conceptions, most of which were so abstract to me. It started when I knew almost everything about Structs in C and nothing about Classes in C++. I went through a great time experimenting them all and learning a lot. I had a hard time evaluating Procedural programming vs Object-Oriented Programming. Deciding when to choose Procedural or Object-Oriented Programming took a great deal of patience for me. I knew that I cannot underestimate any of these Programming styles... Though Procedural programming is often a better choice than simple sequential unstructured programming, when solving problems with procedural programming, we usually divide one problem into several steps in order regarded as functions. Then we call these functions one by one to get the result of the problem. When solving problems with Object Oriented Priciples we divide one problem into several classes and form the interaction between them. Evaluating these two at the beginning (as a learner) required a lot of inspiration and thoughts. Instructing to think step by step. Relative concepts to understand deeply. Intensive interests to contrast both solving in both POP and OOP. If you were ever a mentor: What ideas/methods would you teach to students in which it will Inspire them to learn a programming language (in general, computer sciences)?

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• Limit disk I/O one program creates?

  - by Posipiet

  Hardware: one virtualization server. Dual Nehalem, 24GB RAM, 2 TB mirrored HD. Software: Debian, KVM, virt-manager on the server with several virtual machines that use Linux too. 2 TB Disk is a big LVM, each VM gets a logical volume and makes its own partitions in that. Problem: One of the programs that runs on one of the VMs creates huge disk load. This never was an issue, because the program never ran on such a powerful hardware. Now the CPUs are fast, and lots of I/O is the result. We cant do much against that at the moment, because the tool is a black box. On the other hand, the speedy computation is welcome. The program creates about 5 GB of temp files which get overwritten during the next iteration. Question: How can we limit the disk I/O for the process?

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• Very Cool &ndash; Miami 311 System for tracking citizen service requests (Windows Azure, Silverlight

  - by Jim Duffy

  Having grown up in South Florida this short, but very enlightening, video explaining how the City of Miami has implemented a 311 citizen service request system using Windows Azure, Silverlight and Bing Maps definitely caught my attention. Miami311 The Miami311 System is a Windows Azure/Silverlight-based solution which enables City of Miami citizens report and track issues reported to city management. The system uses Bing Maps to plot the location and relevant information about each issue reported. Citizens now have the ability to easily see the status of the issue without having to call the city office. What I found interesting were a couple of benefits that a metropolitan area such as Miami can take advantage of in Windows Azure cloud-based solution. For the city of Miami, both benefits center around the weather. Of course the threat of a hurricane is a real issue in South Florida and what better way to make sure your site stays up during a hurricane then to have the site hosted far away from the eye of the storm. Using a Windows Azure cloud-based architecture the City of Miami is able to host the application within the Microsoft data centers safely away from any hurricane passing through South Florida. The second benefit is the inherent scalability of a Windows Azure based solution. During a severe weather event like thunderstorms or even worse, a hurricane, downed trees and power lines are a commonly reported problem. Being able to quickly scale up the computing resources required to handle the spike in citizens reporting these types of problems on the site is a huge benefit. Once the weather event has passed and downed tree reports begin to subside they can quickly reverse the process and scale the system back down to pre-storm levels. It’s kind of day-to-day kind of stuff but very cool stuff nonetheless. Have a day. :-|

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• RHN Satellite / Spacewalk custom channels, best practice?

  - by tore-

  Hi, I'm currently setting up RHN Satellite, and all works well. I'm in the process of creating custom channels, since we have certain software which should be available for all nodes of satellite, e.g. puppet, facter, subversion, php (newer version than present in base). I've tried to find documentation on best practices on this. How should they be set up, how to handle different arch, how to handle noarch packages. How to sync updates to dependencies when updating a custom package in a custom channel (e.g. php is updated, how to fetch all updated dependencies). The channel management documentation from RHEL (http://www.redhat.com/docs/en-US/Red_Hat_Network_Satellite/5.3/Channel_Management_Guide/html/Channel_Management_Guide-Custom_Channel_and_Package_Management.html) doesn't provide me with enough information on how to solve any of theese issues. All tips, tricks and information regarding this would be great!

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• How to build the mainline kernel source package?

  - by Maxime R.

  Ubuntu kernel PPA only provides linux-headers*.deb and linux-image*.deb packages. How can I build the corresponding linux-source*.deb package ? Context: I'm currently running Ubuntu 11.10 with the mainline kernel (3.2 rc6 now) to get a better support for my sandybridge IGP (Dell E6420 laptop with intel i5-2520M CPU). Appears, i'd like to install this touchpad driver, ALPS touchpads being badly supported (see previous link bug report), while waiting for upstream support in kernel version 3.3. Problem is, DKMS keeps complaining about not finding the full kernel source: Module build for the currently running kernel was skipped since the kernel source for this kernel does not seem to be installed. Appears I may not need the full source but I'd still like to try having it installed to see if it solve my problem. What I tried : Uncompressing the kernel.org source archive in /usr/src/. DKMS still complaining. Manually updating the kernel source package with uupdate and the mainline source package like explained here. Did not succeed. Manually building the linux-source package following @roadmr and @elmicha instructions. I eventually succeeded to build it but DKMS still complained about the missing source. At last I noticed an error I did not catch in the first place while reinstalling the kernel headers. Appears the .deb I got may have been corrupted, downloading it again did the trick :) Alas, while DKMS agreed to compile the module i ran into the following error which appears to have already been reported. This issue isn't yet solved but I won't try to because of the following: in the end I decided to test the precise kernel version 3.2-rc6 through the xorg-edgers ppa which appears to be correctly patched: it works. Nevertheless, it might still be of some interest to know how to build the mainline linux-source package as the Ubuntu Kernel Team doesn't provide it. Not to mention that I learned a lot in the process ^^

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• Producer-consumer pattern with consumer restrictions

  - by Dan

  I have a processing problem that I am thinking is a classic producer-consumer problem with the two added wrinkles that there may be a variable number of producers and there is the restriction that no more than one item per producer may be consumed at any one time. I will generally have 50-100 producers and as many consumers as CPU cores on the server. I want to maximize the throughput of the consumers while ensuring that there are never more than one work item in process from any single producer. This is more complicated than the classic producer-consumer problem which I think assumes a single producer and no restriction on which work items may be in progress at any one time. I think the problem of multiple producers is relatively easily solved by enqueuing all work items on a single work queue protected by a critical section. I think the restriction on simultaneously processing work items from any single producer is harder because I cannot think of any solution that does not require each consumer to notify some kind of work dispatcher that a particular work item has been completed so as to lift the restriction on work items from that producer. In other words, if Consumer2 has just completed WorkItem42 from Producer53, there needs to be some kind of callback or notification from Consumer2 to a work dispatcher to allow the work dispatcher to release the next work item from Producer53 to the next available consumer (whether Consumer2 or otherwise). Am I overlooking something simple here? Is there a known pattern for this problem? I would appreciate any pointers.

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• The Simplicity of the Oracle Stack

  - by user801960

  For many retailers, technology is something they know they need to optimise business operations, but do they really understand it and how can they select the solutions they need from the many vendors on the market? Retail is a data heavy industry, with the average retailer managing thousands of SKUs and hundreds of categories through multiple channels. Add to this the exponential growth in data driven by social media and mobile activities, and the process can seem overwhelming. Handling data of this magnitude and analyzing it effectively to gain actionable insight is a huge task, and needs several IT components to work together harmoniously to make the best use of the data available and make smarter decisions. With this in mind, Oracle has produced a video to make it easier for businesses to understand its global data IT solutions and how they integrate seamlessly with Oracle’s other solutions to enable organisations to operate as effectively as possible. The video uses an orchestra as an analogy for IT solutions and clever illustration to demonstrate the value of the Oracle brand. This video can be viewed at http://medianetwork.oracle.com/video/player/1622148401001. To find out more about how Oracle’s products and services can help retailers to deliver better results, visit the Oracle Retail website.

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• Debian wheezy keyboard shortcut for both opening and closing a terminal

  - by Peter

  I recently installed tilda and I would like to open it and close with the same keyboard shortcut. I wrote little something in bash that closes tilda if it is open and opens tilda when there is no such a process in ps -ef. It looks like this: a=ps -ef | fgrep -i tilda | cut -d' ' -f4 | head -1;if [ $a ] ; then kill $a; else tilda; fi It seems to be working (at least partially) when I commit this in terminal, but when I assign this command to specific keyboard shortcut (for example alt+1) it does nothing. Any suggestions? btw. is it possible to assign this shortcut for button '`' like in Quake?

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