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• What can I do to make sure my code gets maintained in a developer light environment?

  - by asjohnson

  I am a contract data analyst, so I bounce between jobs every 3-6 months, which I find to be a good fit for me, but it leads to some problems when it comes to coding. I mostly do statistics (I've asked a similar question on cross validated, but the answers there are not relevant here), but I have also found out that the business world loves excel and loves copying and pasting the same thing over and over again even more. This led me to learn how to write VBA scripts and then VB.NET programs to automate as many of these reports as I can. I am certain my programs are not the most elegant, but I put a good bit of effort into making sure they work under as many cases as I can test, I add in exceptions and try to code so the program can handle changes in the files that it processes, but there is a limit, if you remove a huge portion of the data, there is a good chance my program is going to trip up, which I accept will inevitably happen. Usually a pretty minor change in the code fixes the problem and I do try and comment my code and make it readable under the assumption that some other person will have to read it some day. My problem is that I generally get put on teams of folks with essentially no experience with programming (like VBA would be a huge stretch for anyone I work directly with). I am wondering what I should be doing as the person that wrote the code to do my best to keep it maintained. I have two approaches in mind (outlined next), but would be very happy to get any advice. Solution 1: Find the more tech savvy coworkers and run them through the programs and what basic changes can be made. Honestly automating excel is about as easy as it can get when it comes to programming, so I feel like I could teach someone the basics of maintaining it pretty quick. Solution 2: Get in touch with the IT department and show them what is going on and maybe they will be able to help. The problem here is that the IT department is constantly swamped (as I'm sure many of you know) and I feel like kind of a jerk for dumping more things on them. I do leave my personal email address with places and am willing to answer quick questions via email, but I view the need for more exhaustive maintenance as something of an inevitability and would like to make sure I do my due diligence to make sure it gets done. I imagine some combination of the two approaches outlined there, but is there any kind of heads up I should give IT? I feel like I would be annoyed if I started getting requests to fix a program that I had never seen from some random guy that is no longer there.

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• Default values - are they good or evil?

  - by Andrew

  The question about default values in general - default return function values, default parameter values, default logic for when something is missing, default logic for handling exceptions, default logic for handling the edge conditions etc. For a long time I considered default values to be a "pure evil" thing, something that "cloaks the catastrophe" and results in a very hard do find bugs. But recently I started to think about default values as some sort of a technical debt ... which is not a straight bad thing but something that could provide some "short term financing" get us to survive the project (how many of us could afford to buy a house without taking out the mortgage?). When I say a "short term" - I don't mean - "do something quickly first and do refactor it out later before it hits the production". No - I am talking about relying on a hardcoded default values in a production software. Granted - it could cause some issues, but what if it only going to cause a single trouble in a whole year. Again - I am talking about the "average" mainstream software here (not a software for a nuclear power station) - the average web site or a UI application for the accounting software, meaning that people lives are not at stake, nor millions of dollars. Again, from my experience, business users would rather live with the software which "works somehow", rather then wait for a perfect one. And the use of default values helps a lot if you develop a software in a RAD style. But again - the longest debug sessions I have spent were because of the bugs introduced by a default value which either stopped being "a default" along the way or because a small subsystem has recently been upgraded and as a result of this upgrade it does not handle the default correctly (e.g. empty list vs null, or null string vs empty string). So my question is - are the default values good or evil. And if they are a technical debt - how do measure up how much you can borrow so you can afford the repayments? Would really appreciate any input. Cheers. EDIT: If I am using the default values as a way to cut the corners during the development - and if the corners cutting results in a bugs and issues - what is the methodology to recover from these issues?

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• Subterranean IL: Exception handling 1

  - by Simon Cooper

  Today, I'll be starting a look at the Structured Exception Handling mechanism within the CLR. Exception handling is quite a complicated business, and, as a result, the rules governing exception handling clauses in IL are quite strict; you need to be careful when writing exception clauses in IL. Exception handlers Exception handlers are specified using a .try clause within a method definition. .try <TryStartLabel> to <TryEndLabel> <HandlerType> handler <HandlerStartLabel> to <HandlerEndLabel> As an example, a basic try/catch block would be specified like so: TryBlockStart: // ... leave.s CatchBlockEndTryBlockEnd:CatchBlockStart: // at the start of a catch block, the exception thrown is on the stack callvirt instance string [mscorlib]System.Object::ToString() call void [mscorlib]System.Console::WriteLine(string) leave.s CatchBlockEnd CatchBlockEnd: // method code continues... .try TryBlockStart to TryBlockEnd catch [mscorlib]System.Exception handler CatchBlockStart to CatchBlockEnd There are four different types of handler that can be specified: catch <TypeToken> This is the standard exception catch clause; you specify the object type that you want to catch (for example, [mscorlib]System.ArgumentException). Any object can be thrown as an exception, although Microsoft recommend that only classes derived from System.Exception are thrown as exceptions. filter <FilterLabel> A filter block allows you to provide custom logic to determine if a handler block should be run. This functionality is exposed in VB, but not in C#. finally A finally block executes when the try block exits, regardless of whether an exception was thrown or not. fault This is similar to a finally block, but a fault block executes only if an exception was thrown. This is not exposed in VB or C#. You can specify multiple catch or filter handling blocks in each .try, but fault and finally handlers must have their own .try clause. We'll look into why this is in later posts. Scoped exception handlers The .try syntax is quite tricky to use; it requires multiple labels, and you've got to be careful to keep separate the different exception handling sections. However, starting from .NET 2, IL allows you to use scope blocks to specify exception handlers instead. Using this syntax, the example above can be written like so: .try { // ... leave.s EndSEH}catch [mscorlib]System.Exception { callvirt instance string [mscorlib]System.Object::ToString() call void [mscorlib]System.Console::WriteLine(string) leave.s EndSEH}EndSEH:// method code continues... As you can see, this is much easier to write (and read!) than a stand-alone .try clause. Next time, I'll be looking at some of the restrictions imposed by SEH on control flow, and how the C# compiler generated exception handling clauses.

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• Impressions from VMworld - Clearing up Misconceptions

  - by Monica Kumar

  Gorgeous sunny weather…none of the usual summer fog…the Oracle Virtualization team has been busy at VMworld in San Francisco this week. From the time exhibits opened on Sunday, our booth staff was fully engaged with visitors. It was great to meet with customers and prospects, and there were many…most with promises to meet again in October at Oracle OpenWorld 2012. Interests and questions ran the gamut - from implementation details to consolidating applications to how does Oracle VM enable rapid application deployment to Oracle support and licensing. All good stuff! Some inquiries are poignant and really help us get at the customer pain points. Some are just based on misconceptions. We’d like to address a couple of common misconceptions that we heard: 1) Rapid deployment of enterprise applications is great but I don’t do this all the time. So why bother? While production applications don’t get updated or upgraded as often, development and QA staging environments are much more dynamic. Also, in today’s Cloud based computing environments, end users expect an entire solution, along with the virtual machine, to be provisioned instantly, on-demand, as and when they need to scale. Whether it’s adding a new feature to meet customer demands or updating applications to meet business/service compliance, these environments undergo change frequently. The ability to rapidly stand up an entire application stack with all the components such as database tier, mid-tier, OS, and applications tightly integrated, can offer significant value. Hand patching, installation of the OS, application and configurations to ensure the entire stack works well together can take days and weeks. Oracle VM Templates provide a much faster path to standing up a development, QA or production stack in a matter of hours or minutes. I see lots of eyes light up as we get to this point of the conversation. 2) Oracle Software licensing on VMware vSphere In the world of multi-vendor IT stacks, understanding license boundaries and terms and conditions for each product in the stack can be challenging.  Oracle’s licensing, though, is straightforward.  Oracle software is licensed per physical processor in the server or cluster where the Oracle software is installed and/or running.  The use of third party virtualization technologies such as VMware is not allowed as a means to change the way Oracle software is licensed.  Exceptions are spelled out in the licensing document labeled “Hard Partitioning". Here are some fun pictures! Visitors to our booth told us they loved the Oracle SUV courtesy shuttles that are helping attendees get to/from hotels. Also spotted were several taxicabs sporting an Oracle banner! Stay tuned for more highlights across desktop and server virtualization as we wrap up our participation at VMworld.

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• JGridView (Part 2)

  - by Geertjan

  The second sample in the JGrid download is a picture viewer that needs to be seen to be believed. Here it is, integrated into a NetBeans Platform application (click to enlarge it): When you mouse over the images, they change, showing several different images instantaneously. Here's the explorer view above, mainly making use of code from the sample: public class JGridView extends JScrollPane { @Override public void addNotify() { super.addNotify(); final ExplorerManager em = ExplorerManager.find(this); if (em != null) { final JGrid grid = new JGrid(); Node root = em.getRootContext(); final Node[] nodes = root.getChildren().getNodes(); final PicViewerObject[] pics = new PicViewerObject[nodes.length]; for (int i = 0; i < nodes.length; i++) { Node node = nodes[i]; pics[i] = node.getLookup().lookup(PicViewerObject.class); } grid.getCellRendererManager().setDefaultRenderer(new PicViewerRenderer()); grid.setModel(new DefaultListModel() { @Override public int getSize() { return pics.length; } @Override public Object getElementAt(int i) { return pics[i]; } }); grid.setFixedCellDimension(160); grid.addMouseMotionListener(new MouseAdapter() { int lastIndex = -1; @Override public void mouseMoved(MouseEvent e) { if (lastIndex >= 0) { Object o = grid.getModel().getElementAt(lastIndex); if (o instanceof PicViewerObject) { Rectangle r = grid.getCellBounds(lastIndex); if (r != null && !r.contains(e.getPoint())) { ((PicViewerObject) o).setMarker(false); grid.repaint(r); } } } int index = grid.getCellAt(e.getPoint()); if (index >= 0) { Object o = grid.getModel().getElementAt(index); if (o instanceof PicViewerObject) { Rectangle r = grid.getCellBounds(index); if (r != null) { ((PicViewerObject) o).setFraction(((float) e.getPoint().x - (float) r.x) / (float) r.width); ((PicViewerObject) o).setMarker(true); lastIndex = index; grid.repaint(r); } } } } }); grid.getSelectionModel().addListSelectionListener(new ListSelectionListener() { @Override public void valueChanged(ListSelectionEvent e) { //Somehow compare the selected item //with the list of books and find a matching book: int selectedIndex = grid.getSelectedIndex(); for (int i = 0; i < nodes.length; i++) { int picId = pics[i].getId(); if (selectedIndex == picId) { try { em.setSelectedNodes(new Node[]{nodes[i]}); } catch (PropertyVetoException ex) { Exceptions.printStackTrace(ex); } } } } }); setViewportView(grid); } } } The next step is to create a generic JGridView that will handle any kind of object automatically.

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• TechEd 2012: Recap

  - by Tim Murphy

  TechEd this week was a great experience and I wanted to wrap it up with a summary post. First let me say a thank you to John and Jeff from GWB for supplying power, connectivity and a place to work in between sessions.  The blogging hub was a great experience in itself.  Getting to talk with other bloggers and other conference goers turned into a series of interesting conversations.  And where else can you almost end up in the day 1 highlights video? The sessions at TechEd were a mixed bag of value.  The Keynotes rocked, both figuratively and literally and most of the sessions that I want to were a good experience and had gems of information to take away.  There were a few exceptions though.  A couple of the sessions turned out to be sales jobs.  Nothing turns me off more than that (there will be some really honest comments on those surveys). TechEd re-enforced for me that much of the value is not in the sessions, but in the networking opportunities. I got to talk with several Microsoft team members and MVPs as well as some of the vendor representative for companies like Inrule and ComponentOne. Also got to expand both my local and extended community with discussions at meal times and waiting for sessions to start. I think this is one of the benefits that a lot of people don’t take advantage of in these conferences that should be a bigger part of the advertising. Exposure to a wide variety of topics, many of which I had not been able to make time for up to this point was envigorating.  The list of topic includes: Office 365, Windows Server 2012, Windows 8, Metro, Azure.  I can’t wait to get back to work and dig into these subjects in more depth. The one complaint that I had and heard from other attendees was that there weren’t enough sessions that were actually about development.  I realize that TechEd started as an event for IT Pros, but there needs to be more value for the Devs.  It all went by too fast and it will take a couple more days to digest the material, but the batteries are and I’m ready to leverage what I’ve learned.  Hopefully we will do it again next year. del.icio.us Tags: TechEd,TechEd 2012

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• Updating an Entity through a Service

  - by GeorgeK

  I'm separating my software into three main layers (maybe tiers would be a better term): Presentation ('Views') Business logic ('Services' and 'Repositories') Data access ('Entities' (e.g. ActiveRecords)) What do I have now? In Presentation, I use read-only access to Entities, returned from Repositories or Services, to display data. $banks = $banksRegistryService->getBanksRepository()->getBanksByCity( $city ); $banksViewModel = new PaginatedList( $banks ); // some way to display banks; // example, not real code I find this approach quite efficient in terms of performance and code maintanability and still safe as long as all write operations (create, update, delete) are preformed through a Service: namespace Service\BankRegistry; use Service\AbstractDatabaseService; use Service\IBankRegistryService; use Model\BankRegistry\Bank; class Service extends AbstractDatabaseService implements IBankRegistryService { /** * Registers a new Bank * * @param string $name Bank's name * @param string $bik Bank's Identification Code * @param string $correspondent_account Bank's correspondent account * * @return Bank */ public function registerBank( $name, $bik, $correspondent_account ) { $bank = new Bank(); $bank -> setName( $name ) -> setBik( $bik ) -> setCorrespondentAccount( $correspondent_account ); if( null === $this->getBanksRepository()->getDefaultBank() ) $this->setDefaultBank( $bank ); $this->getEntityManager()->persist( $bank ); return $bank; } /** * Makes the $bank system's default bank * * @param Bank $bank * @return IBankRegistryService */ public function setDefaultBank( Bank $bank ) { $default_bank = $this->getBanksRepository()->getDefaultBank(); if( null !== $default_bank ) $default_bank->setDefault( false ); $bank->setDefault( true ); return $this; } } Where am I stuck? I'm struggling about how to update certain fields in Bank Entity. Bad solution #1: Making a series of setters in Service for each setter in Bank; - seems to be quite reduntant, increases Service interface complexity and proportionally decreases it's simplicity - something to avoid if you care about code maitainability. I try to follow KISS and DRY principles. Bad solution #2: Modifying Bank directly through it's native setters; - really bad. If you'll ever need to move modification into the Service, it will be pain. Business logic should remain in Business logic layer. Plus, there are plans on logging all of the actions and maybe even involve user permissions (perhaps, through decorators) in future, so all modifications should be made only through the Service. Possible good solution: Creating an updateBank( Bank $bank, $array_of_fields_to_update) method; - makes the interface as simple as possible, but there is a problem: one should not try to manually set isDefault flag on a Bank, this operation should be performed through setDefaultBank method. It gets even worse when you have relations that you don't want to be directly modified. Of course, you can just limit the fields that can be modified by this method, but how do you tell method's user what they can and cannot modify? Exceptions?

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• Why would I learn C++11, having known C and C++?

  - by Shahbaz

  I am a programmer in C and C++, although I don't stick to either language and write a mixture of the two. Sometimes having code in classes, possibly with operator overloading, or templates and the oh so great STL is obviously a better way. Sometimes use of a simple C function pointer is much much more readable and clear. So I find beauty and practicality in both languages. I don't want to get into the discussion of "If you mix them and compile with a C++ compiler, it's not a mix anymore, it's all C++" I think we all understand what I mean by mixing them. Also, I don't want to talk about C vs C++, this question is all about C++11. C++11 introduces what I think are significant changes to how C++ works, but it has introduced many special cases that change how different features behave in different circumstances, placing restrictions on multiple inheritance, adding lambda functions, etc. I know that at some point in the future, when you say C++ everyone would assume C++11. Much like when you say C nowadays, you most probably mean C99. That makes me consider learning C++11. After all, if I want to continue writing code in C++, I may at some point need to start using those features simply because my colleagues have. Take C for example. After so many years, there are still many people learning and writing code in C. Why? Because the language is good. What good means is that, it follows many of the rules to create a good programming language. So besides being powerful (which easy or hard, almost all programming languages are), C is regular and has few exceptions, if any. C++11 however, I don't think so. I'm not sure that the changes introduced in C++11 are making the language better. So the question is: Why would I learn C++11? Update: My original question in short was: "I like C++, but the new C++11 doesn't look good because of this and this and this. However, deep down something tells me I need to learn it. So, I asked this question here so that someone would help convince me to learn it." However, the zealous people here can't tolerate pointing out a flaw in their language and were not at all constructive in this manner. After the moderator edited the question, it became more like a "So, how about this new C++11?" which was not at all my question. Therefore, in a day or too I am going to delete this question if no one comes up with an actual convincing argument. P.S. If you are interested in knowing what flaws I was talking about, you can edit my question and see the previous edits.

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• NHibernate Session Load vs Get when using Table per Hierarchy. Always use ISession.Get&lt;T&gt; for TPH to work.

  - by Rohit Gupta

  Originally posted on: http://geekswithblogs.net/rgupta/archive/2014/06/01/nhibernate-session-load-vs-get-when-using-table-per-hierarchy.aspxNHibernate ISession has two methods on it : Load and Get. Load allows the entity to be loaded lazily, meaning the actual call to the database is made only when properties on the entity being loaded is first accessed. Additionally, if the entity has already been loaded into NHibernate Cache, then the entity is loaded directly from the cache instead of querying the underlying database. ISession.Get<T> instead makes the call to the database, every time it is invoked. With this background, it is obvious that we would prefer ISession.Load<T> over ISession.Get<T> most of the times for performance reasons to avoid making the expensive call to the database. let us consider the impact of using ISession.Load<T> when we are using the Table per Hierarchy implementation of NHibernate. Thus we have base class/ table Animal, there is a derived class named Snake with the Discriminator column being Type which in this case is “Snake”. If we load This Snake entity using the Repository for Animal, we would have a entity loaded, as shown below: public T GetByKey(object key, bool lazy = false) { if (lazy) return CurrentSession.Load<T>(key); return CurrentSession.Get<T>(key); } var tRepo = new NHibernateReadWriteRepository<TPHAnimal>(); var animal = tRepo.GetByKey(new Guid("602DAB56-D1BD-4ECC-B4BB-1C14BF87F47B"), true); var snake = animal as Snake; snake is null As you can see that the animal entity retrieved from the database cannot be cast to Snake even though the entity is actually a snake. The reason being ISession.Load prevents the entity to be cast to Snake and will throw the following exception: System.InvalidCastException :  Message=Unable to cast object of type 'TPHAnimalProxy' to type 'NHibernateChecker.Model.Snake'. Thus we can see that if we lazy load the entity using ISession.Load<TPHAnimal> then we get a TPHAnimalProxy and not a snake. =============================================================== However if do not lazy load the same cast works perfectly fine, this is since we are loading the entity from database and the entity being loaded is not a proxy. Thus the following code does not throw any exceptions, infact the snake variable is not null: var tRepo = new NHibernateReadWriteRepository<TPHAnimal>(); var animal = tRepo.GetByKey(new Guid("602DAB56-D1BD-4ECC-B4BB-1C14BF87F47B"), false); var snake = animal as Snake; if (snake == null) { var snake22 = (Snake) animal; }

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• Defining a service layer: the text-based adventure

  - by Stacy Vicknair

  Applications these days have more options than ever for a user interface, and it’s only going to grow. A successful product might require native applications for mobile devices, a regular web implementation, or even a gaming console. These systems often will be centralized and data driven. The solution is one that’s fairly solitary, a service layer! Simply put, take what’s shared and put it behind a physical or abstract layer that defines the boundary between the specific user interface and the shared content.   I know, I know, none of this is complicated. But some times it can be difficult to discern what belongs on which side of the line. For instance, say we’re creating a service that will provide content for both an ASP.NET MVC application and a WP7 application. Although the content served to each application is the same, there are different paradigms and patterns for displaying that data in the different environments. In ASP.NET MVC, you may create a model specific to a page that combines necessary information. In the WP7 application you might require different sets of data that you will connect via MVVM with the view. The general rule of thumb is that any shared content, business rules, or data should exist separately. Any element that is specific to the current UI implementation should be included in a separate library or with the UI implementation itself. The WP7 application doesn’t need my MVC specific model classes. My MVC application doesn’t require those INotifyPropertyChanged viewmodels that the WP7 application depends on. In both cases, there should be additional processing done above the service layer to massage the data to the application’s specific needs.   Service-ocalypse: the text based adventure What helps me the most about deciding whether or not something belongs coupled to the UI implementation or in the shared implementation is thinking of the simplest implementation you could have: a console application. You might have played a game like Peasant’s Quest: The console app is the text based adventure game version of your application. If you’re service was consumed in its simplest form, you would simply have a console based API for it that issues requests. Maybe those requests aren’t SWIM TO BOAT, but they might be CREATE USER JOHN. If I issue a request, I expect that request to be issued to the service. If the service has any exceptions or issues with my input, that business logic should be encapsulated in that service, not implemented in the UI. The service layer should be your functional application in its entirety, and anything above that layer should only assist with the display of that information.

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• Unintentional run-in with C# thread concurrency

  - by geekrutherford

  For the first time today we began conducting load testing on a ASP.NET application already in production. Obviously you would normally want to load test prior to releasing to a production environment, but that isn't the point here.   We ran a test which simulated 5 users hitting the application doing the same actions simultaneously. The first few pages visited seemed fine and then things just hung for a while before the test failed. While the test was running I was viewing the performance counters on the server noting that the CPU was consistently pegged at 100% until the testing tool gave up.   Fortunately the application logs all exceptions including those unhandled to the database (thanks to log4net). I checked the log and low and behold the error was:   System.ArgumentException: An item with the same key has already been added. (The rest of the stack trace intentionally omitted)   Since the code was running with debug on the line number where the exception occured was also provided. I began inspecting the code and almost immediately it hit me, the section of code responsible for the exception is trying to initialize a static class. My next question was how is this code being hit multiple times when I have a rudimentary check already in place to prevent this kind of thing (i.e. a check on a public variable of the static class before entering the initializing routine). The answer...the check fails because the value is not set before other threads have already made it through.   Not being one who consistently works with threading I wasn't quite sure how to handle this problem. Fortunately a co-worker recalled having to lock a section of code in the past but couldn't recall exactly how. After a quick search on Google the solution is as follows:   Object objLock = new Object(); lock(objLock) { //logic requiring lock }   The lock statement takes an object and tells the .NET runtime that the current thread has exclusive access while the code within brackets is executing. Once the code completes, the lock is released for another thread to utilize.   In my case, I only need to execute the inner code once to initialize my static class. So within the brackets I have a check on a public variable to prevent it from being initialized again.

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• MySQL Connector/Net 6.6.4 RC1 has been released

  - by fernando

  MySQL Connector/Net 6.6.4, a new version of the all-managed .NET driver  for MySQL has been released.  This is the Release Candidate intended to introduce users to the new features in the release.  This release is feature complete it should be stable enough for users to understand the new features and how we expect them to work.  As is the case with all non-GA releases, it should not be used in any production environment.  It is appropriate for use with MySQL server versions 5.0-5.6 It is now available in source and binary form from http://dev.mysql.com/downloads/connector/net/#downloads and mirror sites (note that not all mirror sites may be up to date at this point-if you can't find this version on some mirror, please try again later or choose another download site.) The 6.6 version of MySQL Connector/Net brings the following new features:   * Stored routine debugging   * Entity Framework 4.3 Code First support   * Pluggable authentication (now third parties can plug new authentications mechanisms into the driver).   * Full Visual Studio 2012 support: everything from Server Explorer to Intellisense&  the Stored Routine debugger. The following specific fixes are addressed in this version: - Fixed Entity Framework + mysql connector/net in partial trust throws exceptions (MySql bug #65036, Oracle bug #14668820). - Added support in Parser for Datetime and Time types with precision when using Server 5.6 (No bug Number). - Fix for bug TIMESTAMP values are mistakenly represented as DateTime with Kind = Local (Mysql bug #66964, Oracle bug #14740705). The release is available to download athttp://dev.mysql.com/downloads/connector/net/6.6.html Documentation ------------------------------------- You can view current Connector/Net documentation at http://dev.mysql.com/doc/refman/5.5/en/connector-net.html For specific topics: Stored Routine Debugger:http://dev.mysql.com/doc/refman/5.5/en/connector-net-visual-studio-debugger.html Authentication plugin:http://dev.mysql.com/doc/refman/5.5/en/connector-net-programming-authentication-user-plugin.html You can find our team blog at http://blogs.oracle.com/MySQLOnWindows. You can also post questions on our forums at http://forums.mysql.com/. Enjoy and thanks for the support!

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• What is the right way to group this project into classes?

  - by sigil

  I originally asked this on SO, where it was closed and recommended that I ask it here instead. I'm trying to figure out how to group all the functions necessary for my project into classes. The goal of the project is to execute the following process: Get the user's FTP credentials (username & password). Check to make sure the credentials establish a valid connection to the FTP server. Query several Sharepoint lists and join the results of those queries to create a list of items that need to have action taken on them. Each item in the list has a folder. For each item: Zip the contents of the folder. Upload the folder to the FTP server using SFTP Update the item's Sharepoint data. Email the user an Excel report showing, e.g., Items without folder paths Items that failed to zip or upload Steps 2-5 are performed on a periodic basis; if step 2 returns an invalid connection, the user is alerted and the process returns to step 1. If at any point the user presses a certain key, the process terminates. I've defined the following set of classes, each of which is in its own .cs file: SFTP: file transfer processes DataHandler: Sharepoint data retrieval/querying/updating processes. Also makes and uploads the zip files. Exceptions: Not just one class, this is the .cs file where I have all of my exception classes. Report: Builds and sends the report. Program: The main class for running the program. I recognize that the DataHandler class is a god object, but I don't have a good idea of how to refactor it. I feel like it should be more fine-grained than just breaking it into Sharepoint, Zip, and Upload, but maybe that's it. Also, I haven't yet worked out how to combine the periodic behavior with the "wait for user input at any point in the process" part; I think that involves threads, which means other classes to manage the threads... I'm not that well-versed in design patterns, but is there one that fits this project well? If this is too big of a topic to neatly explain in an SO answer, I'll also accept a link to a good tutorial on what I'm trying to do here.

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• Error installing TFS in Windows 8

  - by Davi Fiamenghi

  Trying to install TFS on my computer in order to make a demonstration. I can't figure out what else can I do to solve these errors: Information [ System Checks ] TF255142: Windows Firewall is not enabled. If you enable Windows Firewall after configuring Team Foundation Server, you must add exceptions for ports used by Team Foundation Server to Windows Firewall. Error [ Application Tier ] TF255120: Compatibility mode for Internet Information Services (IIS) 6.0 is not enabled. Team Foundation Server requires this on this operating system. Error [ Application Tier ] TF255456: You must configure Internet Information Services (IIS) to use the Static Content component. Team Foundation Server requires the Static Content component in IIS. Error [ Application Tier ] TF255397: Windows Authentication has not been configured as a role service in Internet Information Services (IIS). Team Foundation Server requires that Windows Authentication is installed as one of the role services in IIS. Error [ Application Tier ] TF255397: Windows Authentication has not been configured as a role service in Internet Information Services (IIS). Team Foundation Server requires that Windows Authentication is installed as one of the role services in IIS. Error [ Application Tier ] TF255397: Windows Authentication has not been configured as a role service in Internet Information Services (IIS). Team Foundation Server requires that Windows Authentication is installed as one of the role services in IIS. Here are my IIS features: (I installed and restarted the computer) Everything requested on the errors are installed, running on Windows 8 Consumer Preview Build 8250. IIS is working normally on http: //localhost:80 "Default Application" Please, Am I missing something?

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• SCCM 2012 - Windows 8 WSUS

  - by Owen

  We're using SCCM 2012 to deploy Windows Updates on our domain, and our Windows 8 clients have started failing with error 80240438 when they try to update. Windows 7 clients update fine, but Windows 8 clients refuse to do anything. I've done a search online and it seems to only reference Windows InTune. Has anyone seen any similar behavior on Windows 8 machines? If we don't get that error, we're getting 80244021 which seems to indicate that the server can't be found.... but they can resolve it just fine and our exceptions are defined on the proxy too. A bit stuck here! 2012-11-22 14:45:28:935 476 998 Agent ********* 2012-11-22 14:45:28:935 476 998 Agent ** END ** Agent: Finding updates [CallerId = AutomaticUpdates] 2012-11-22 14:45:28:935 476 998 Agent ************* 2012-11-22 14:45:28:935 476 998 Agent WARNING: WU client failed Searching for update with error 0x80240438 2012-11-22 14:45:28:935 476 c74 AU >>## RESUMED ## AU: Search for updates [CallId = {EAECB947-48AC-43BE-8F98-C44727E4A131} ServiceId = {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7}] 2012-11-22 14:45:28:935 476 c74 AU # WARNING: Search callback failed, result = 0x80240438 2012-11-22 14:45:28:935 476 c74 AU ######### 2012-11-22 14:45:28:935 476 c74 AU ## END ## AU: Search for updates [CallId = {EAECB947-48AC-43BE-8F98-C44727E4A131} ServiceId = {3DA21691-E39D-4DA6-8A4B-B43877BCB1B7}] 2012-11-22 14:45:28:935 476 c74 AU ############# 2012-11-22 14:45:28:935 476 c74 AU All AU searches complete. 2012-11-22 14:45:28:935 476 c74 AU # WARNING: Failed to find updates with error code 80240438 2012-11-22 14:45:28:935 476 c74 AU AU setting next detection timeout to 2012-11-22 04:12:23 2012-11-22 14:45:33:936 476 c9c Report REPORT EVENT: {EE35CD79-FD2A-472D-BFC9-0420F5D60C04} 2012-11-22 14:45:28:935+1300 1 148 [AGENT_DETECTION_FAILED] 101 {00000000-0000-0000-0000-000000000000} 0 80240438 AutomaticUpdates Failure Software Synchronization Windows Update Client failed to detect with error 0x80240438. 2012-11-22 14:45:33:938 476 c9c Report CWERReporter::HandleEvents - WER report upload completed with status 0x8 2012-11-22 14:45:33:938 476 c9c Report WER Report sent: 7.8.9200.16420 0x80240438 00000000-0000-0000-0000-000000000000 Scan 101 Managed 2012-11-22 14:45:33:938 476 c9c Report CWERReporter finishing event handling. (00000000) Thanks in advance

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• Watchguard Firewall WebBlocker Regular Expression for Multiple Domains?

  - by Eric

  I'm pretty sure this is really a regex question, so you can skip to REGEX QUESTION if you want to skip the background. Our primary firewall is a Watchguard X750e running Fireware XTM v11.2. We're using webblocker to block most of the categories, and I'm allowing needed sites as they arise. Some sites are simple to add as exceptions, like Pandora radio. That one is just a pattern matched exception with "padnora.com/" as the pattern. All traffic from anywhere on pandora.com is allowed. I'm running into trouble on more sophisticated domains that reference content off of their base domains. We'll take GrooveShark as a sample. If you go to http://grooveshark.com/ and view page source, you'll see hrefs referring to gs-cdn.net as well as grooveshar.com. So adding a WebBlocker exception to grooveshark.com/ is not effective, and I have to add a second rule allowing gs-cdn.net/ as well. I see that the WebBlocker allows regex rules, so what I'd like to do in situations like this is create a single regex rule that allows traffic to all the needed domains. REGEX QUESTION: I'd like to try a regex that matches grooveshark.com/ and gs-cdn.net/. If anybody can help me write that regex, I'd appreciate it. Here is what is in the WatchGuard documentation from that section: Regular expression Regular expression matches use a Perl-compatible regular expression to make a match. For example, .[onc][eor][gtm] matches .org, .net, .com, or any other three-letter combination of one letter from each bracket, in order. Be sure to drop the leading “http://” Supports wild cards used in shell script. For example, the expression “(www)?.watchguard.[com|org|net]” will match URL paths including www.watchguard.com, www.watchguard.net, and www.watchguard.org. Thanks all!

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• Can't Access TFS 2010 Beta 2 from Visual Studio 2010 Beta 2 when domain joined

  - by Brian Sullivan

  I'm experimenting with an installation of TFS 2010 Beta 2 on a virtual machine under VirtualBox running Windows Server 2008. When I've got the server in a workgroup, I can connect to it from Visual Studio just fine, as long as I provide credentials for a local user on the server machine when prompted by the "Connect to Team Foundation Server" dialog. The desktop I'm running Visual Studio on is joined to a domain. However, when I join the server to the domain, I can no longer connect to it from Visual Studio. I get a pretty generic error message: "TF31002 - Unable to connect to team foundation server". It gives me several different possible problems, including an incorrect address or an incorrect username and password. I've already added the domain Windows identity with which I'm logged on the the desktop to the TFS Admins group on the server, so I don't think it's a username/password problem. I've also tried putting the literal IP address of the server in the dialog address box instead of the machine name, but still no dice. I made sure that network discovery was enabled on the server, too, and can navigate to "\\webserver2008" in Windows Explorer without any problems. Shouldn't be a firewall problem, since the TFS install creates the appropriate exceptions in Windows Firewall. It's all a bit confusing, since it seems to work when the server is in a workgroup. Note: I'm a dev, not an admin, so there are many subtleties of server administration with which I'm not familiar. Please make no assumptions about what I may or may not have tried; what may be obvious to you may have never occurred to me. Thanks in advance!

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• Event ID: 861 - The Windows Firewall has detected an application listening for incoming traffic

  - by Chris Marisic

  Firstly, my machines aren't compromised any person suggesting such will be DV'd. The security logs on some of my networks client machines (all Windows Xp Sp3) get filled with these useless error messages. Security Failure Audit Detailed Tracking Event ID: 861 User: NT AUTHORITY\NETWORK SERVICE The Windows Firewall has detected an application listening for incoming traffic. Name: - Path: C:\WINDOWS\system32\svchost.exe Process identifier: 976 User account: NETWORK SERVICE User domain: NT AUTHORITY Service: Yes RPC server: No IP version: IPv4 IP protocol: UDP Port number: 55035 Allowed: No User notified: No It's always on various random ports of UDP so setting up a port exception isn't really an option. It's always from svchost or lsass both of which are running services from DLLs. One of the most offending processes seems to the be DnsCache. I have in my global policy under AT < Network < Network Connection < Widnows Firewall < Domain Profile (I haven't changed any standard profile options do both need configured? To allow remote administration and desktop exceptions and have a custom program exception list that has %SystemRoot%\system32\svchost.exe:*:enabled:svchost (Windows won't allow you to add this exception on a local machine but it let me have it on here in the global policy it just doesn't seem to do anything) %SystemRoot%\system32\lsass.exe:*enabled:lsass (I think this one ended all of my LSASS messages) %SystemRoot%\system32\dnsrslvr.dll:*:enabled:dnscache (I tried adding the dll itself to the exception list, this didn't seem to do anything) Is there really any other options left other than disabling the Windows Firewall entirely, disabling auditing entirely or just changing the event viewer to just auto overwrite when needed? I'd much rather fix the problem and get rid of these entries ever being created instead of just trying to cover up the problem.

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• How to ask memcached auth connection by sasl and pam?

  - by user199216

  I use memcached in a untrust network, so I try to use sasl and pam to auth connection to memcached. I installed sasl and pam module, compiled and installed memcached with sasl enabled. Also I created db and table for pam user. I run: $ sudo testsaslauthd -u tester -p abc123 -s /etc/pam.d/memcached 0: OK "Success." where the tester and abc123 is the authed user in db, which I inserted. But my python script cannot be authed, always authentication failed returned. It seems it dose not use pam to authentication, still use sasldb, because when I add user by: $ sudo saslpasswd2 -a memcached -c tester and input password: abc123, It can passed. Python script: client = bmemcached.Client(('localhost:11211'), 'tester', 'abc123') and error: bmemcached.exceptions.MemcachedException: Code: 32 Message: Auth failure. memcached log: authenticated() in cmd 0x21 is true mech: ``PLAIN'' with 14 bytes of data SASL (severity 2): Password verification failed sasl result code: -20 Unknown sasl response: -20 >30 Writing an error: Auth failure. >30 Writing bin response: no auth log found in: /var/log/auth.log Configurations: vi /etc/default/saslauthd MECHANISMS="pam" vi /etc/pam.d/memcached auth sufficient pam_mysql.so user=sasl passwd=abc123 host=localhost db=sasldb table=sasl_user usercolumn=user_name passwdcolumn=password crypt=0 sqllog=1 verbose=1 account required pam_mysql.so user=sasl passwd=abc123 host=localhost db=sasldb table=sasl_user usercolumn=user_name passwdcolumn=password crypt=0 sqllog=1 verbose=1 vi /etc/sasl2/memcached.conf pwcheck_method: saslauthd Do I make my question clear, english is not my native language, sorry! Any tips will be thankful!

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• Centos CMake Does Not Install Using gcc 4.7.2

  - by Devin Dixon

  A similar problem has been reported here with no solution:https://www.centos.org/modules/newbb/print.php?form=1&topic_id=42696&forum=56&order=ASC&start=0 I've added and upgraded gcc to centos cd /etc/yum.repos.d wget http://people.centos.org/tru/devtools-1.1/devtools-1.1.repo yum --enablerepo=testing-1.1-devtools-6 install devtoolset-1.1-gcc devtoolset-1.1-gcc-c++ scl enable devtoolset-1.1 bash The result is this for my gcc [root@hhvm-build-centos cmake-2.8.11.1]# gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/opt/centos/devtoolset-1.1/root/usr/libexec/gcc/x86_64-redhat-linux/4.7.2/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --prefix=/opt/centos/devtoolset-1.1/root/usr --mandir=/opt/centos/devtoolset-1.1/root/usr/share/man --infodir=/opt/centos/devtoolset-1.1/root/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --disable-build-with-cxx --disable-build-poststage1-with-cxx --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --enable-languages=c,c++,fortran,lto --enable-plugin --with-linker-hash-style=gnu --enable-initfini-array --disable-libgcj --with-ppl --with-cloog --with-mpc=/home/centos/rpm/BUILD/gcc-4.7.2-20121015/obj-x86_64-redhat-linux/mpc-install --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux Thread model: posix gcc version 4.7.2 20121015 (Red Hat 4.7.2-5) (GCC) And I tried to then install cmake through http://www.cmake.org/cmake/resources/software.html#latest But I keep running into this error: Linking CXX executable ../bin/ccmake /opt/centos/devtoolset-1.1/root/usr/libexec/gcc/x86_64-redhat-linux/4.7.2/ld: CMakeFiles/ccmake.dir/CursesDialog/cmCursesMainForm.cxx.o: undefined reference to symbol 'keypad' /opt/centos/devtoolset-1.1/root/usr/libexec/gcc/x86_64-redhat-linux/4.7.2/ld: note: 'keypad' is defined in DSO /lib64/libtinfo.so.5 so try adding it to the linker command line /lib64/libtinfo.so.5: could not read symbols: Invalid operation collect2: error: ld returned 1 exit status gmake[2]: *** [bin/ccmake] Error 1 gmake[1]: *** [Source/CMakeFiles/ccmake.dir/all] Error 2 gmake: *** [all] Error 2 The problem seems to come from the new gcc installed because it works with the default install. Is there a solution to this problem?

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• DirectAccess Server firewall rules blocking ports

  - by StormPooper

  I have configured DirectAccess on my Server 2012 Essentials box and most of it works great - I can remotely access the server via RDP and the default IIS website on port 80. However, I can't access anything that uses other ports. For this example, the Team Foundation Server website. The only way to access it is by accessing http://localhost:8080/tfs on the server directly - even when using http://servername:8080/tfs or http://192.168.1.100:8080/tfs won't work. I've tried adding the ports to the NAT exceptions using Set-NetNatTransitionConfiguration –IPv4AddressPortPool and while that has allowed some ports used internally (Deluge, for example) it hasn't allowed me access to the URL. I think I've narrowed it down to the "DirectAccess Server Settings" Group Policy that is created when configuring DirectAccess. When I disable the link for this GPO, the TFS site works again, but the default IIS site stops working (but RDP still works). I already have rules in the firewall on the server for TFS and before enabling this Group Policy (so before configuring DirectAccess) I could access both sites. Does anybody have any suggestions for things I can change to allow access to both? I've uploaded the full GPO report and my Remote Access Configuration Summary for more details.

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• backupexec 12.5 not following symlinks on linux agent

  - by Peter Carrero

  Ok, we are at a loss here trying to backup a linux box to a backupexec server... we got a backupexec 12.5 server and a "backupexec for windows servers linux agent" (sigh) running on one of our linux boxes. When a backup runs, we get exceptions reported for our symbolic links. it says something like: BACKUP- \\<servername>\[ROOT] File \\<servername>\[ROOT]/<foldername>/<symlink> is in the backup selection list but was not found. Looking at the selection list, the symlink shows as a 1k file on BUE. Tools-Options-Backup has Backup files and directories by following symbolic links/junction points selected. These same checkboxes are selected on the Job Setup-Job Properties-Edit Template-Advanced Additionally, all the checkboxes are checkeced on Tools-Options-Linux, Unix, and Macintosh and on the Job Set-Job Properties-Edit Template-Linux, Unix, and Macintosh. These checkboxes read: "Preserve change time", "Follow local mount points", "Follow remote mount points", "Backup contents of soft-linked directories" and "Lock remote files", but apparently changing those options produce the same result. Any help on how to get BUE to make a proper backup would be greatly appreciated. Thanks.

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• Is anyone using KVM in production?

  - by Andy Shellam

  I've been trying to set up a pair of servers utilising KVM on Ubuntu 9.10 to host 8 virtual machines between them and ended up with various issues from the VMs freezing, to not powering on. I had one virtual server set up and running and was setting up a second, when any operation involving OpenSSL would cause the VM to lock up in a weird way - all network traffic would cease, it wouldn't process logins on the console, but it wasn't taking any CPU time off the host. The first virtual server was identical and worked perfectly. Another VM I tried to setup had installed Ubuntu fine then refused to reboot, throwing kernel exceptions to do with XFS. I've now installed Citrix XenServer 5.5 on both hosts, and am now setting up my third VM with absolutely no issues. I also had the same experience when I tried VMware, but I preferred Xen as it appears to give more features on the free license. My question is am I just unlucky with KVM, or is KVM as unstable as it appears? Are you using, or planning on using, KVM in production, and how successful have you been?

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• Automate Windows 7's file sharing and firewall settings

  - by nhinkle

  I am working with my school to customize Windows 7 on some new laptops we are receiving. The laptops come with Windows 7 Professional already installed, and we do not need or want to reimage them. We would however like to customize the installation once it is in place, through a series of scripts. We will also be deploying these scripts to computers which have already been set up. Most of the settings we wish to change can be done easily from the command line or with a registry file. However, there is one thing we keep getting hung up on: networking options. Is there any unattended way to set the Windows 7 networking configuration? We would like to set the following things automatically, which are found under Control Panel > Network and Sharing Center > Advanced sharing settings > Home or Work network: Turn on network discovery Turn on printer and file sharing Turn off public folder sharing Turn on password protected sharing Use user accounts and passwords to connect to other computers We also need to configure the firewall to allow the following exceptions: File and printer sharing Remote assistance Remote desktop Remote scheduled tasks management Remote service management Windows remote management I've looked around, and can't find any way to change these things - I looked into netsh, registry settings, and even used RegMon to watch while I changed the values manually, all to no avail. Google hasn't offered up anything helpful so far. If anyone could provide some insight, I would very much appreciate it. I did find out that much of this is configurable with group policy, but because these computers are in a workgroup, not a domain, I don't know of any way to take advantage of that in an unattended manner.

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• Use icacls to make a directory read-only on Windows 7

  - by Dave G

  I'm attempting to test some filesystem exceptions in a Java based application. I need to find a way to create a directory that is located under %TMP% that is set to read-only. Essentially on UNIX/POSIX platforms, I can do a chmod -w and get this effect. Under Windows 7/NTFS this is of course a different story. I'm running into multiple issues on this. My user has "administrative" right (although this may not always be the case) and as such the directory is created with an ACL including: NT AUTHORITY\SYSTEM BUILTIN\Administrators <my current user> Is there a way using icacls to essentially get this directory into a state where it is read-only PERIOD, do my test, then restore the ACL for removal? EDIT With the information provided by @Ansgar Wiechers I was able to come up with a solution. I used the following: icacls dirname /deny %username%:(WD) In the page located here I found this in the remarks section: icacls preserves the canonical order of ACE entries as: * Explicit denials * Explicit grants * Inherited denials * Inherited grants By performing the above icalcs command, I was able to set the current user's ability to write or append files (WD) to the directory to deny. Then it was a question of returning it to a state post test: icacls dirname /reset /t /c Done

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