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• Multiple sites with the same codebase in Python

  - by Jimmy

  I am trying to run a large amount of sites which share about 90% of their code. They are simply designed to query an API and return the results. They will have a common userbase / database but will be configured slightly different and will have different CSS (perhaps even different templating). My initial idea was to run them as separate applications with a common library but I have read about the sites framework which would allow them to run from a single instance of Django which may help to reduce memory usage. https://docs.djangoproject.com/en/dev/ref/contrib/sites/ Is the site framework the right approach to a problem like this, and does it have real benefits over running separate applications? Initially I thought it was, but now I think otherwise. I have heard the following: Your SITE_ID is set in settings.py, so in order to have multiple sites, you need multiple settings.py configurations, which means multiple distinct processes/instances. You can of course share the code base between them, but each site will need a dedicated worker / WSGIDaemon to serve the site. This effectively removes any benefit of running multiple sites under one hood, if each site needs a UWSGI instance running. Alternative ideas of systems: https://github.com/iivvoo/django_layers https://github.com/shestera/django-multisite I don't know what route to be taking with this.

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• Do you know when to send a done email in Scrum?

  - by Martin Hinshelwood

  At SSW we have always sent done emails to the owner/requestor to let them know that it is done. Others who are dependent on that tasks are CC’ed so they know they can proceed. But how does that fit into Scrum?   Update 14th April 2010 Rule added to Rules to better Scrum with TFS If you are working on a task: When you complete a Task that is part of a User Story you need to send a done email to the Owner of that Story. You only need to add the Task #, Summary and link to the item in WIWA. Remember that all your tasks should be under 4 hours, do spending lots of time on a Done Email for a Task would be counter productive. Add more information if required, for example you may have completed the task a different way than previously discussed.  Make sure that every User Story has an Owner as per the rules. If you are the owner of a story: When you complete a story you should send a comprehensive done email as per the rules when the story had been completed. Make sure you add a list of all of the Tasks that were completed as part of the story and the Done criteria that you completed. If your done criteria says: Built Successfully 30% Code Coverage All tests passed Then add an illustration to show this. Figure: Show that you have met your Done criteria where possible.   This is all designed to help you Scrum Team members (Product Owner, ScrumMaster and Team) validate the quality of the work that has been completed. Remember that you are not DONE until your team says you are done.   Technorati Tags: SSW,Scrum,SSW Rules

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• Exclusive use of a Jini server during long-running call

  - by Matthew Flint

  I'm trying to use Jini, in a "Masters/Workers" arrangement, but the Worker jobs may be long running. In addition, each worker needs to have exclusive access to a singleton resource on that machine. As it stands, if a Worker receives another request while a previous request is running, then the new request is accepted and executed in a second thread. Are there any best-practices to ensure that a Worker accepts no further jobs until the current job is complete? Things I've considered: synchronize the job on the server, with a lock on the singleton resource. This would work, but is far from ideal. A call from a Master would block until the current Worker thread completes, even if other Workers become free in the meantime unregister the Worker from the registry while the job is running, then re-register when it completes. Might work OK, but something doesn't smell right with this idea... Of course, I'm quite happy to be told that there are more appropriate technologies than Jini... but I wouldn't want anything too heavyweight, like rolling out EJB containers all over the place.

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• Is Movable Type among the most secure PHP blogs? How secure are the various PHP blog applications?

  - by user6025

  Basically I'm trying to find a blog for a website, and security is the highest priority in our case. We don't need any features that I would imagine are special. Wordpress was our first idea, but its reputation precedes it, and though it may have cleaned up its act lately, I'm not seeing much solid evidence. I get the impression that Movable Type (at least the Perl version) has a much better reputation for security than Wordpress (historically at least). I'm not sure I want to take a chance with Wordpress at this point, but is there some objective source I can got to to back up (or counter) the notion that MT is at least among the best? Secunia doesn't recommend using their stats for comparisons, and securityfocus.com doesn't have stats at all that I can see. Searching here http://web.nvd.nist.gov makes MT look way better than WP (at least in 2007), but this site was referenced by MT's own page boasting about their security, so I don't know how relevant it is or how seriously people take it. Any suggestions on sites where I could/should make a somewhat objective comparison?

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• Re-enabling audio on an iMac

  - by Warren Seine

  Hello guys, I know Super User is not a 'tech support' forum, so I will try to make it short: my computer's sound does not work anymore. I have asked for support on the Apple board but I feel a bit on my own. To summarize, the Sound Panel of my iMac does not display any outgoing channel (headphones or internal speakers). It does not work on Windows either. Contrary to what it may seem, I have the feeling that it is not a hardware issue (and that GarageBand is somehow interfering). If you have an idea to solve the problem, please share. Making it work again is a lost cause without sending it back to Apple, so the question I'm asking is: What is the best workaround (cheap Firewire sound card?) for getting my sound back? Thanks.

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• Non-Profit Technololgy for Non-Profits?

  - by TomJ

  I've been looking around for a way to give back to the community, but I haven't found my right fit yet, so an idea came to mind: A non-profit technology "company" that targets non-profits. Do these exist? I've been doing some google searches and can only find software that is targeted for non-profits that is created by for-profit companies or that charges what I believe to be an outrages amount, conferences directed towards non-profits and technology they may use -- or articles complaining about the digital divide and how non-profits view technology as key but dont have the funds or the knowledge to employ it. Pseudo "Business Model" An open source 501(3)(c) organization that targets directly targets non-profits to fill the "digital divide." Most services would be free and consulting fees would be charged for customization. Donations would be accepted and government grants would be sought after. This would enable non-profits to keep pace with the for-profits in the technology sector, but at little to no cost. Perhaps the first "industry" to be targeted would be those that fill key social needs like unemployment, or food banks.

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• Create a bootable Ghost CD from a HDD

  - by r0ca

  Hi all, I have a little issue and it may be quite simple to fix. I need to Ghost some computers (locally) and now, it seems to be really hard to have several computers to boot from floppy. Sometimes the floppy is not detected (Old PC) and doesn't boot from it. So I need to create a Ghost image from a HDD. I use Disk to Disk when ghosting from an IDE HDD but I'd like to change it to Disk from Image. My issue is it's a linux, IDE HDD, and I have a laptop with Windows 7. I also have a USB adaptor for IDE HDD. I'm trying to find a way to create a Bootable CD from the HDD connected on my laptop with the USB adaptor. Is it possible to do this? What would be the best way to do that?

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• windows service application run fine on windows XP but crashes on windows7

  - by Abbas Siddiqui

  I am sorry If my question asked before, I search extensively but didn't found. If present please post the link of that question. I have developed windows service that works fine on windows xp , when I installed it on windows7 it installed and works fine for few minutes, after that is crashes and gives the following error message. has stopped working windows is checking for the solution to the problem. the log entry is as follows Fault bucket 1155193276, type 5 Event Name: CLR20r3 Response: Not available Cab Id: 0 Problem signature: P1: windowsserviceapp.exe P2: 1.0.0.0 P3: 4bf29a85 P4: System.Windows.Forms P5: 2.0.0.0 P6: 4a275ebd P7: 16cf P8: 159 P9: System.ComponentModel.Win32 P10: Attached files: C:\Users\DELL\AppData\Local\Temp\WERF98D.tmp.WERInternalMetadata.xml These files may be available here: C:\Users\DELL\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_windowsserviceap_89ea5da5168ff1535681aa613b5f7bf2b1636dc_111d24f1 Analysis symbol: Rechecking for solution: 0 Report Id: 24dc8c83-62a1-11df-b1ee-00271352d813

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• Efficient mapping layout in 2D side-scroller, and collisions between character and the world

  - by Jack

  I haven't touched Visual Studio for a couple months now, but I was playing a game from the '90s toady and had an epiphany: I was looking for something what i didn't need, and I wasn't using what I knew correctly. One of those realizations was collision, so let me tell you a bit about my project that I was working on. The project's graphics looks like Mario or Dangerous Dave, etc., you get the idea - old-school pixels. So anyway I remember trying to think of something else than AABB for character form, but I couldn't think of anything. Perhaps I could get a suggestion for this? Another thing is the world - I don't want it to be just linear world, I want mountains, etc.. My idea is to use triangles, and no idea yet what to do if I want just part of the cube, say 3/4 or 2/4 or whatever. Hard-coding such things seems inefficient. P.S. I am not looking at the precision level offered by Box2D. Actually I remember trying to implement it at first, but I failed as my understanding of C++ wasn't advanced enough, as it'll be mentioned below. P.P.S. I am programming in C++, and I haven't done it for a couple months now. I have no means of testing it either, as my PC is broken down, and this one can barely run games from late '90s, not to speak about a compiler or a program with inefficient resource management... I am also not an expert (obviously), I don't even know if I can consider myself an average programmer. In short, I am simply curious about my thoughts and my past experience when programming the game. I may come back to it when my PC is fixed, I'm already filling a note about these things.

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• responsibility for storage

  - by Stefano Borini

  A colleague and I were brainstorming about where to put the responsibility of an object to store itself on the disk in our own file format. There are basically two choices: object.store(file) fileformatWriter.store(object) The first one gives the responsibility of serialization on the disk to the object itself. This is similar to the approach used by python pickle. The second groups the representation responsibility on a file format writer object. The data object is just a plain data container (eventually with additional methods not relevant for storage). We agreed on the second methodology, because it centralizes the writing logic from generic data. We also have cases of objects implementing complex logic that need to store info while the logic is in progress. For these cases, the fileformatwriter object can be passed and used as a delegate, calling storage operations on it. With the first pattern, the complex logic object would instead accept the raw file, and implement the writing logic itself. The first method, however, has the advantage that the object knows how to write and read itself from any file containing it, which may also be convenient. I would like to hear your opinion before starting a rather complex refactoring.

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• session management: verifying a user's log-in state

  - by good_computer

  I am storing sessions in my database. Everytime a user logs in, I create a new row corresponding to the new session, generate a new session id and send it as a cookie to the browser. My session data looks something like this: { 'user_id': 1234 'user_name': 'Sam' ... } When a request comes, I check whether a cookie with a session id is sent. If it is, I fetch session data from my database (or memcache) corresponding to that session id. When the user logs out, I remove the session data from my database (and memcache), and delete the cookie from the user's browser too. Notice that in my session data, I don't have something like logged_in: true. This is because if I find a session record in the database (or memcache) I deduce that the user is logged in, and if there is no session record found, the user is not logged in. My question is: is this the right approach? Should I have a logged_in key in my session data? Is there any possibility that a session record may be present on the server where the corresponding user is actually NOT logged in? Are there any security implications in having or not having such a key?

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• Why are my at jobs running immediately on OS X?

  - by Gabe

  I want to schedule events for exact times in Mac OS X. It seems like the 'at' command is the simplest way to do this. I have enabled atrun using the command: launchctl load -w /System/Library/LaunchDaemons/com.apple.atrun.plist To test at, I'm using the following one-line BASH script: echo 'foo' path/to/log.txt | at now + 2 minutes When I run the script, I get output like: job 17 at Sat May 15 12:57:00 2010 where '12:57:00' is indeed 2 minutes in the future. But the echo command executes immediately: the line 'foo' is added to log.txt right away. How can I make at work for me?

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• Variant Management– Which Approach fits for my Product?

  - by C. Chadwick

  Jürgen Kunz – Director Product Development – Oracle ORACLE Deutschland B.V. & Co. KG Introduction In a difficult economic environment, it is important for companies to understand the customer requirements in detail and to address them in their products. Customer specific products, however, usually cause increased costs. Variant management helps to find the best combination of standard components and custom components which balances customer’s product requirements and product costs. Depending on the type of product, different approaches to variant management will be applied. For example the automotive product “car” or electronic/high-tech products like a “computer”, with a pre-defined set of options to be combined in the individual configuration (so called “Assembled to Order” products), require a different approach to products in heavy machinery, which are (at least partially) engineered in a customer specific way (so-called “Engineered-to Order” products). This article discusses different approaches to variant management. Starting with the simple Bill of Material (BOM), this article presents three different approaches to variant management, which are provided by Agile PLM. Single level BOM and Variant BOM The single level BOM is the basic form of the BOM. The product structure is defined using assemblies and single parts. A particular product is thus represented by a fixed product structure. As soon as you have to manage product variants, the single level BOM is no longer sufficient. A variant BOM will be needed to manage product variants. The variant BOM is sometimes referred to as 150% BOM, since a variant BOM contains more parts and assemblies than actually needed to assemble the (final) product – just 150% of the parts You can evolve the variant BOM from the single level BOM by replacing single nodes with a placeholder node. The placeholder in this case represents the possible variants of a part or assembly. Product structure nodes, which are part of any product, are so-called “Must-Have” parts. “Optional” parts can be omitted in the final product. Additional attributes allow limiting the quantity of parts/assemblies which can be assigned at a certain position in the Variant BOM. Figure 1 shows the variant BOM of Agile PLM. Figure 1 Variant BOM in Agile PLM During the instantiation of the Variant BOM, the placeholders get replaced by specific variants of the parts and assemblies. The selection of the desired or appropriate variants is either done step by step by the user or by applying pre-defined configuration rules. As a result of the instantiation, an independent BOM will be created (Figure 2). Figure 2 Instantiated BOM in Agile PLM This kind of Variant BOM  can be used for „Assembled –To-Order“ type products as well as for „Engineered-to-Order“-type products. In case of “Assembled –To-Order” type products, typically the instantiation is done automatically with pre-defined configuration rules. For „Engineered- to-Order“-type products at least part of the product is selected manually to make use of customized parts/assemblies, that have been engineered according to the specific custom requirements. Template BOM The Template BOM is used for „Engineered-to-Order“-type products. It is another type of variant BOM. The engineer works in a flexible environment which allows him to build the most creative solutions. At the same time the engineer shall be guided to re-use existing solutions and it shall be assured that product variants of the same product family share the same base structure. The template BOM defines the basic structure of products belonging to the same product family. Let’s take a gearbox as an example. The customer specific configuration of the gearbox is influenced by several parameters (e.g. rpm range, transmitted torque), which are defined in the customer’s requirement document.  Figure 3 shows part of a Template BOM (yellow) and its relation to the product family hierarchy (blue).  Figure 3 Template BOM Every component of the Template BOM has links to the variants that have been engineeried so far for the component (depending on the level in the Template BOM, they are product variants, Assembly Variant or single part variants). This library of solutions, the so-called solution space, can be used by the engineers to build new product variants. In the best case, the engineer selects an existing solution variant, such as the gearbox shown in figure 3. When the existing variants do not fulfill the specific requirements, a new variant will be engineered. This new variant must be compliant with the given Template BOM. If we look at the gearbox in figure 3  it must consist of a transmission housing, a Connecting Plate, a set of Gears and a Planetary transmission – pre-assumed that all components are must have components. The new variant will enhance the solution space and is automatically available for re-use in future variants. The result of the instantiation of the Template BOM is a stand-alone BOM which represents the customer specific product variant. Modular BOM The concept of the modular BOM was invented in the automotive industry. Passenger cars are so-called „Assembled-to-Order“-products. The customer first selects the specific equipment of the car (so-called specifications) – for instance engine, audio equipment, rims, color. Based on this information the required parts will be determined and the customer specific car will be assembled. Certain combinations of specification are not available for the customer, because they are not feasible from technical perspective (e.g. a convertible with sun roof) or because the combination will not be offered for marketing reasons (e.g. steel rims with a sports line car). The modular BOM (yellow structure in figure 4) is defined in the context of a specific product family (in the sample it is product family „Speedstar“). It is the same modular BOM for the different types of cars of the product family (e.g. sedan, station wagon). The assembly or single parts of the car (blue nodes in figure 4) are assigned at the leaf level of the modular BOM. The assignment of assembly and parts to the modular BOM is enriched with a configuration rule (purple elements in figure 4). The configuration rule defines the conditions to use a specific assembly or single part. The configuration rule is valid in the context of a type of car (green elements in figure 4). Color specific parts are assigned to the color independent parts via additional configuration rules (grey elements in figure 4). The configuration rules use Boolean operators to connect the specifications. Additional consistency rules (constraints) may be used to define invalid combinations of specification (so-called exclusions). Furthermore consistency rules may be used to add specifications to the set of specifications. For instance it is important that a car with diesel engine always is build using the high capacity battery.  Figure 4 Modular BOM The calculation of the car configuration consists of several steps. First the consistency rules (constraints) are applied. Resulting from that specification might be added automatically. The second step will determine the assemblies and single parts for the complete structure of the modular BOM, by evaluating the configuration rules in the context of the current type of car. The evaluation of the rules for one component in the modular BOM might result in several rules being fulfilled. In this case the most specific rule (typically the longest rule) will win. Thanks to this approach, it is possible to add a specific variant to the modular BOM without the need to change any other configuration rules.  As a result the whole set of configuration rules is easy to maintain. Finally the color specific assemblies respective parts will be determined and the configuration is completed. Figure 5 Calculated Car Configuration The result of the car configuration is shown in figure 5. It shows the list of assemblies respective single parts (blue components in figure 5), which are required to build the customer specific car. Summary There are different approaches to variant management. Three different approaches have been presented in this article. At the end of the day, it is the type of the product which decides about the best approach.  For „Assembled to Order“-type products it is very likely that you can define the configuration rules and calculate the product variant automatically. Products of type „Engineered-to-Order“ ,however, need to be engineered. Nevertheless in the majority of cases, part of the product structure can be generated automatically in a similar way to „Assembled to Order“-tape products.  That said it is important first to analyze the product portfolio, in order to define the best approach to variant management.

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• MATLAB: Best fitness vs mean fitness, initial range

  - by Sa Ta

  Based on the example of Rastrigin's function. At the plot function, if I chose 'best fitness', on the same graph 'mean fitness' will also be plotted. I understand well about 'best fitness' whereby it plots the best function value in each generation versus iteration number. It will reach value zero after some times. I don't understand about 'mean fitness'in the graph plotted. What do those 'mean fitness' values mean? How does the 'mean fitness' graph help to understand Rastrigin's function? What are the meaning of the term initial population, initial score and initial range? I wish to have a better understanding of these terms. The default value for initial range is [0,1]. Does it mean that 0 is the lower bound (lb) and 1 is the upper bound (ub)? Do these values interfere with the lb and ub values I set in the constraints? I try to better understand about lb and ub. If my lb is 0 and ub is 5, does it mean that my final point values will be within 0 and 5? If I know the lb and ub for my problem is between 0 and 5, do I just set the initial range as [0,5] at all times and may I assume that this is the best option for initial range, and I need not try it with any other values?

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• Portable scripting language for a multi-server admin?

  - by Aaron

  Please Note: Portable as in portableapps.com, not the traditional definition. Originally posted on stackoverflow.com, asking here at another user's suggestion. I'm a DBA and sysadmin, mostly for Windows machines running SQL Server. I'm looking for a programming/scripting language for Windows that doesn't require Admin access or an installer, needing no install process other than expanding it into a folder. My intent is to have a language for automation on which I can standardize. Up to this point, I've been using a combination of batch files and Unix shell, using sh.exe from UnxUtils but it's far from a perfect solution. I've evaluated a handful of options, all of them have at least one serious shortcoming or another. I have a strong preference for something open source or dual license, but I'm more interested in finding the right tool than anything else. Not interested that anything that relies on Cygwin or Java, but at this point I'd be fine with something that needs .NET. Requirements: Manageable footprint (1-100 files, under 30 MB installed) Run on Windows XP and Server (2003+) No installer (exe, msi) Works with external pipes, processes, and files Support for MS SQL Server or ODBC connections Bonus Points: Open Source FFI for calling functions in native DLLs GUI support (native or gtk, wx, fltk, etc) Linux, AIX, and/or OS X support Dynamic, object oriented and/or functional, interpreted or bytecode compiled; interactive development Able to package or compile scripts into executables So far I've tried: Ruby: 148 MB on disk, 23000 files Portable Python: 54 MB on disk, 2800 files Strawberry Perl: 123 MB on disk, 3600 files REBOL: Great, except closed source and no MSSQL or ODBC in free version Squeak Smalltalk: Great, except poor support for scripting ---- cut: points of clarification ---- Why all the limitations? I realize some of my criteria seem arbitrarily confining. It's primarily a product my environment. I work as a SQL Server DBA and backup Unix admin at a division of a large company. In addition to near a hundred boxes running some version or another of SQL Server on Windows, I also support the SQL Server Express Edition installs on over a thousand machines in the field. Because of our security policies, I don't login rights on every machine. Often enough, an issue comes up and I'm given local Admin for some period of time. Often enough, it's some box I've never touched and don't have my own environment setup yet. I may have temporary admin rights on the box, but I'm not the admin for the machine- I'm just the DBA. I've no interest in stepping on the toes of the Windows admins, nor do I want to take over any of their duties. If I bring up "installing" something, suddenly it becomes a matter of interest for Production Control and the Windows admins; if I'm copying up a script, no one minds. The distinction may not mean much to the readers, but if someone gets the wrong idea I've suddenly got a long wait and significant overhead before I can get the tool installed and get the problem solved. That's why I want something that can be copied and run in the manner of a portable app. What about the small footprint? My company has three divisions, each in a different geographical location, and one of them is a new acquisition. We have different production control/security policies in each division. I support our MSSQL databases in all three divisions. The field machines are spread around the US, sometimes connecting to the VPN over very slow links. Installing Ruby \using psexec has taken a long time over these connections. In these instances, the bigger time waster seems to be archives with thousands and thousands of files rather than their sheer size. You could say I'm spoiled by Unix, where the admins usually have at least some modern scripting language installed; I'd use PowerShell, but I don't know it well and more importantly it isn't everywhere I need to work. It's a regular occurrence that I need to write, deploy and execute some script on short notice on some machine I've never on which logged in. Since having Ruby or something similar installed on every machine I'll ever need to touch is effectively impossible because of the approvals, time and and Windows admin labor needed I makes more sense find a solution that allows me to work on my own terms.

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• Stable MSN messenger for mac?

  - by Console

  I use Adium in my mac as a client for MSN messenger. (I have also tried the "official" live messenger for mac for a while but it had even worse issues than what I am experiencing with Adium). Everything works fine for the first 5-10 minutes, perhaps until the first automatic "away", then suddenly any message I send is followed by a dozen or so messages saying: "Message could not be sent because a connection error occurred:" and Message may have not been sent because a timeout occurred: If I send a few messages, they usually eventually arrive (all at once) after a long delay. Windows machines on the same network running live messenger work fine. Any ideas why this might be, or suggestions for a client that might work when both Adium and Microsofts own messenger for mac seem to disconnect?

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• Determining Performance Limits

  - by JeffV

  I have a number of windows processes that pass messages between them hat a high rate using tcp to local host. Aside from testing on actual hardware how can I assess what my hardware limit will be. These applications are not doing CPU intensive work, mostly decomposing and combining messages, scanning over them for special flag in the data etc.. The message size is typically 3k and the rate is typically ~10k messages per second. ~30MB per second between processing stages. There may be 10 or more stages depending. For this type of application, what should I look to for assessing performance? What do I look for in a server performance wise? I am currently running an XEON L5408 with 32 GB ram. But I am assuming cache is more important than actual ram size as I am barely touching the ram.

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• Page Titles - Including gender of a fashion product in page titles?

  - by Cedric

  I need a bit of help to decide whether it is worth including gender in page titles. In the webmaster tools: I looked at our search queries that include "women", and they account for 9% of our total search queries for the site. I am wondering if it is the right way assess the benefit of including "woman" or "men" in page titles, looking at it with existing results pointing to us already? Is there another tool that I can check the actual queries that may not include us in search results? Like google insights maybe? http://www.google.com/insights/search/#q=shoes%2Cshoes%20for%20women&cmpt=q So it looks like 1.1% of searches for "shoes" are also "shoes for women" is that correct? As a direct comparison, doing the same analysis on our own search queries, I get 1.8% when comparing "shoes for women" to "shoes" Implementing this automation would probably affect 99% of our site if not more, splitting it in 2 segments (one portion of page titles including "women" and the other including "men") Will doing so create a massively repetitive keyword throughout the site, hurting SEO? http://support.google.com/webmasters/bin/answer.py?hl=en&answer=35624 (see "Avoid repeated or boilerplate titles.")

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• Where is a good place to start to learn about custom caching in .Net

  - by John

  I'm looking to make some performance enhancements to our site, but I'm not sure exactly where to begin. We have some custom object caching, but I think that we can do better. Our Business We aggregate news stories on a news type of web site. We get approximately 500-1000 new stories per week. We have index pages that show various lists of the items and details pages that show the individual stories. Our Current Use case: Getting an Individual Story User makes a request The Data Access Layer(DAL) checks to see if the item is in cache and if item is fresh (15 minutes). If the item is not in cache or is not fresh, retrieve the item from SQL Server, save to cache and return to user. Problems with this approach The pull nature of caching means that users have to pay the waiting cost every time that the cache is refreshed. Once a story is published, it changes infrequently and I think that we should replace the pull model with something better. My initial thoughts My initial thought is that stories should ALL be stored locally in some type of dictionary. (Cache or is there another, better way?). If the story is not found, then make a trip to the database, update the local dictionary and send the item back. Since there may be occasional updates to stories, this should be an entirely process from the user. I watched a video by Brent Ozar, How StackOverflow Scales SQL Server, in which Brent states "the fastest database query is the one that you don't make". Where do I start? At this point, I don't know exactly what the solution is. Is it caching? Is there a better way of using local storage? Do I use a Dictionary, OrderedDictionary, List ? It seems daunting and I'm just looking for some good starting points to learn more about how to do this type of optimization.

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• Best of OTN - Week of August 17th

  - by CassandraClark-OTN

  Architect CommunityThe Top 3 most popular OTN ArchBeat video interviews of all time: Oracle Coherence Community on Java.net | Brian Oliver and Randy Stafford [October 24, 2013] Brian Oliver (Senior Principal Solutions Architect, Oracle Coherence) and Randy Stafford (Architect At-Large, Oracle Coherence Product Development) discuss the evolution of the Oracle Coherence Community on Java.net and how developers can actively participate in product development through Coherence Community open projects. Visit the Coherence Community at: https://java.net/projects/coherence. The Raspberry Pi Java Carputer and Other Wonders | Simon Ritter [February 13, 2014] Oracle lead Java evangelist Simon Ritter talks about his Raspberry Pi-based Java Carputer IoT project and other topics he presented at QCon London 2014. Hot Features in Oracle APEX 5.0 | Joel Kallman [May 14, 2014] Joel Kallman (Director, Software Development, Oracle) shares key points from his Great Lakes Oracle Conference 2014 session on new features in Oracle APEX 5.0. Friday Funny from OTN Architect Community Manager Bob Rhubart: Comedy legend Steve Martin entertains dogs in this 1976 clip from the Carol Burnette show. Database Community OTN Database Community Home Page - See all tech articles, downloads etc. related to Oracle Database for DBA's and Developers. Java Community JavaOne Blog - JRuby and JVM Languages at JavaOne!  In this video interview, Charles shared the JRuby features he presented at the JVM Language Summit. He'll be at JavaOne read the blog to see all the sessions. Java Source Blog - IoT: Wearables! Wearables are a subset of the Internet of Things that has gained a lot of attention. Learn More. I love Java FaceBook - Java Advanced Management Console demo - Watch as Jim Weaver, Java Technology Ambassador at Oracle, walks through a demonstration of the new Java Advanced Management Console (AMC) tool. Systems Community OTN Garage Blog - Why Wouldn't Root Be Able to Change a Zone's IP Address in Oracle Solaris 11? - Read and learn the answer. OTN Garage FaceBook - Securing Your Cloud-Based Data Center with Oracle Solaris 11 - Overview of the security precautions a sysadmin needs to take to secure data in a cloud infrastructure, and how to implement them with the security features in Oracle Solaris 11.

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• How do you cope with change in open source frameworks that you use for your projects?

  - by Amy

  It may be a personal quirk of mine, but I like keeping code in living projects up to date - including the libraries/frameworks that they use. Part of it is that I believe a web app is more secure if it is fully patched and up to date. Part of it is just a touch of obsessive compulsiveness on my part. Over the past seven months, we have done a major rewrite of our software. We dropped the Xaraya framework, which was slow and essentially dead as a product, and converted to Cake PHP. (We chose Cake because it gave us the chance to do a very rapid rewrite of our software, and enough of a performance boost over Xaraya to make it worth our while.) We implemented unit testing with SimpleTest, and followed all the file and database naming conventions, etc. Cake is now being updated to 2.0. And, there doesn't seem to be a viable migration path for an upgrade. The naming conventions for files have radically changed, and they dropped SimpleTest in favor of PHPUnit. This is pretty much going to force us to stay on the 1.3 branch because, unless there is some sort of conversion tool, it's not going to be possible to update Cake and then gradually improve our legacy code to reap the benefits of the new Cake framework. So, as usual, we are going to end up with an old framework in our Subversion repository and just patch it ourselves as needed. And this is what gets me every time. So many open source products don't make it easy enough to keep projects based on them up to date. When the devs start playing with a new shiny toy, a few critical patches will be done to older branches, but most of their focus is going to be on the new code base. How do you deal with radical changes in the open source projects that you use? And, if you are developing an open source product, do you keep upgrade paths in mind when you develop new versions?

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• Why isn't DSM for unstructured memory done today?

  - by sinned

  Ages ago, Djikstra invented IPC through mutexes which then somehow led to shared memory (SHM) in multics (which afaik had the necessary mmap first). Then computer networks came up and DSM (distributed SHM) was invented for IPC between computers. So DSM is basically a not prestructured memory region (like a SHM) that magically get's synchronized between computers without the applications programmer taking action. Implementations include Treadmarks (inofficially dead now) and CRL. But then someone thought this is not the right way to do it and invented Linda & tuplespaces. Current implementations include JavaSpaces and GigaSpaces. Here, you have to structure your data into tuples. Other ways to achieve similar effects may be the use of a relational database or a key-value-store like RIAK. Although someone might argue, I don't consider them as DSM since there is no coherent memory region where you can put data structures in as you like but have to structure your data which can be hard if it is continuous and administration like locking can not be done for hard coded parts (=tuples, ...). Why is there no DSM implementation today or am I just unable to find one?

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• Google authorship verification issue

  - by Fraser

  I'm trying to get my blog content author verified so my face gets into the Google search results. I managed to achieve this a few weeks back - When testing my content in the Google authorship testing tool it reported that I had been verified and I could see my mug in the results. All I had to do was wait a couple of weeks before I started popping up in the search results (I think(?)). However, I seem to have thrown a spanner in the works. I set up Google apps for my domain and merged my old Google+ profile into my google apps account. This seemed to reset my Google+ profile (no biggy, since it was a new profile and only had 1 connection). I re-set up my G+ account and tied it all in to my blog and it's content. I am now seeing some very strange behaviour. If you take a look at one of my blog posts through the snippet testing tool: http://www.google.com/webmasters/tools/richsnippets?url=http%3A%2F%2Fblog.fraser-hart.co.uk%2Fjquery-fullscreen-background-slideshow%2F&html= You will see that it is not recognising me as an author. However, when you enter my profile URL (https://plus.google.com/108765138229426105004) into the "Authorship verification by email" input, you will see that it does in fact recognise it as verified. Now, if you try and verify the same page again, it reverts back to unverified. I thought I may have to just wait it out but this has been over a week now and previously (before I merged my profile) it happened instantaneously. Has anyone experienced this bizarre behaviour before? What is happening here? More importantly, is there anything I can do to resolve it? (Apologies for the long and boring question). Cheers!

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• Does anyone use a Dual, Triple, or Quad HP Monitor Display Setup?

  - by jasondavis

  I have been searching google and all over the web for weeks now to find some photo's of people using 2 or more of the widescreen HP monitors with no luck yet. They are pretty much the nicest monitor I have seen at all the electron stores in the past 2 years so I know a lot of people have to be using these however I cannot find any photos of triple and quad setups using thee monitors. Do you have any photos of such a setup or know where I may find some? Here are some photos of the monitors I am speaking of...

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• Error starting Hyper-V VM

  - by Peter Bernier

  I'm trying to start a VM on a new Hyper-V installation and I'm receiving the following error: The virtual machine could not be started because the hypervisor is not running. The following actions may help you resolve the problem: 1) Verify that the processor of the physical computer has a supported version of hardware-assisted virtualization. 2) Verify that hardware-assisted virtualization and hardware-assisted data execution protection are enabled in the BIOS of the physical computer. (If you edit the BIOS to enable either setting, you must turn off the power to the physical computer and then turn it back on. Resetting the physical computer is not sufficient.) 3) If you have made changes to the Boot Configuration Data store, review these changes to ensure that the hypervisor is configured to launch automatically. My machine supports virtualization at the hardware level and it is enabled in BIOS. Why am I receiving this error?

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