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• Help identify the pattern for reacting on updates

  - by Mike

  There's an entity that gets updated from external sources. Update events are at random intervals. And the entity has to be processed once updated. Multiple updates may be multiplexed. In other words there's a need for the most current state of entity to be processed. There's a point of no-return during processing where the current state (and the state is consistent i.e. no partial update is made) of entity is saved somewhere else and processing goes on independently of any arriving updates. Every consequent set of updates has to trigger processing i.e. system should not forget about updates. And for each entity there should be no more than one running processing (before the point of no-return) i.e. the entity state should not be processed more than once. So what I'm looking for is a pattern to cancel current processing before the point of no return or abandon processing results if an update arrives. The main challenge is to minimize race conditions and maintain integrity. The entity sits mainly in database with some files on disk. And the system is in .NET with web-services and message queues. What comes to my mind is a database queue-like table. An arriving update inserts row in that table and the processing is launched. The processing gathers necessary data before the point of no-return and once it reaches this barrier it looks into the queue table and checks whether there're more recent updates for the entity. If there are new updates the processing simply shuts down and its data is discarded. Otherwise the processing data is persisted and it goes beyond the point of no-return. Though it looks like a solution to me it is not quite elegant and I believe this scenario may be supported by some sort of middleware. If I would use message queues for this then there's a need to access the queue API in the point of no-return to check for the existence of new messages. And this approach also lacks elegance. Is there a name for this pattern and an existing solution?

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• Experimenting with other search engines

  - by Bill Graziano

  I’ve been a Google user so long I can hardly remember what I used before it.  Alta Vista maybe?  Or Yahoo.  I’ve tried Bing off and on but it never really stuck.  I probably care more about search engines than your average user because of their impact on SQLTeam.com.  Lately I’ve been trying two other search engines and actually switched to one of them. I’ve played with Blekko a little in the past.  They have some interesting ways to “slice up” your results.  For example, searching on “SQL Server /blogs /date” should just search all the recently updated blogs.  Those two extra words on the search are slashtags.  The full list of slashtags runs from /forums to just see forums to /twitter to /nikon to /reviews and on and on and on.  I laughed when I saw they had slashtags for both liberal and conservative.  I’d hate to find any search results that don’t match my existing worldview :)  You can also create your own slashtags.  I created a mini-search engine for the SQL Server blogs that I read.  You can search it for “backup” at http://blekko.com/ws/backup+/billgraziano/sql-sites.  I uploaded my OPML and it limited the search to just those sites.  It seems like the site is focusing more on curating results and less on algorithms.  This is an interesting site for those power searchers.  There are some great ways to curate results using slashtags.  For 99% of my searches (type words, click on one of the first few links) slashtags are overkill.  They do have some good information on page and site ranking though so I’ll probably send some time looking through that. Blekko recently got my attention again when they said they were banning “content farms” - and that includes eHow and experts-exchange.  I always feel used when I click on a link to EE and find myself scrolling all the way to the bottom to see if I can find the answer.  Sometimes it’s there but sometimes it tells me I need to pay first.  I’ve longed for a way to always exclude certain sites.  Blekko might be taking a hammer to a problem that needs a scalpel but it’s an interesting choice.  (And some of the comments in the TechCrunch link are interesting if you’re a search nerd.) DuckDuckGo is an odd name for a search engine.  Their big hook is that they don’t have search history.  If you wade through your Google account you can probably find the page where it stores your search history.  It was pretty enlightening to find mine.  It was easy to disable but that got me started looking at other search engines.  DDG (or DukGo) just feels like Google used to in the old days.  The results are good enough and the site is fast. Searches will return a snippet from WikiPedia or other site (like StackOverflow) at the top.  I think the idea is to answer the question without needing to visit the site.  I’m not sure that’s a good thing for SQLTeam.com. The only thing I really miss is image search.  You can add a “!i” at the end of any search and it will search the images on Bing.  Bing doesn’t have a great image search but it works for most of what I need.  They call these exclamation marks “!bangs” and they are kinda, sorta like slashtags.  I’ve been using DuckDuckGo now for a few weeks and I’m pretty happy with it.  I use Chrome for my browser and it was an easy switch to make.  It’s still a little surprising seeing my search results come up in a different format.  I’m starting to get used to it though.

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• What arguments can I use to "sell" the BDD concept to a team reluctant to adopt it?

  - by S.Robins

  I am a bit of a vocal proponent of the BDD methodology. I've been applying BDD for a couple of years now, and have adopted StoryQ as my framework of choice when developing DotNet applications. Even though I have been unit testing for many years, and had previously shifted to a test-first approach, I've found that I get much more value out of using a BDD framework, because my tests capture the intent of the requirements in relatively clear English within my code, and because my tests can execute multiple assertions without ending the test halfway through - meaning I can see which specific assertions pass/fail at a glance without debugging to prove it. This has really been the tip of the iceberg for me, as I've also noticed that I am able to debug both test and implementation code in a more targeted manner, with the result that my productivity has grown significantly, and that I can more easily determine where a failure occurs if a problem happens to make it all the way to the integration build due to the output that makes its way into the build logs. Further, the StoryQ api has a lovely fluent syntax that is easy to learn and which can be applied in an extraordinary number of ways, requiring no external dependencies in order to use it. So with all of these benefits, you would think it an easy to introduce the concept to the rest of the team. Unfortunately, the other team members are reluctant to even look at StoryQ to evaluate it properly (let alone entertain the idea of applying BDD), and have convinced each other to try and remove a number of StoryQ elements from our own core testing framework, even though they originally supported the use of StoryQ, and that it doesn't impact on any other part of our testing system. Doing so would end up increasing my workload significantly overall and really goes against the grain, as I am convinced through practical experience that it is a better way to work in a test-first manner in our particular working environment, and can only lead to greater improvements in the quality of our software, given I've found it easier to stick with test first using BDD. So the question really comes down to the following: What arguments can I use to really drive the point home that it would be better to use StoryQ, or at the very least apply the BDD methodology? Can you point me to any anecdotal evidence that I can use to support my argument to adopt BDD as our standard method of choice? What counter arguments can you think of that could suggest that my wish to convert the team efforts to BDD might be in error? Yes, I'm happy to be proven wrong provided the argument is a sound one. NOTE: I am not advocating that we rewrite our tests in their entirety, but rather to simply start working in a different manner for all future testing work.

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• how to keep display tick rate steady when using continuous collision detection?

  - by nas Ns

  (I've just found about this forum). I hope it is ok to repost my question again here. I posted this question at stackoverflow, but it looks like I might get better help here. Here is the question: I've implemented basic particles motion simulation with continuous collision detection. But there is small issue in display. Assume simple case of circles moving inside square. All elastic collisions. no firction. All motion is constant speed. No forces are involved, no gravity. So when a particle is moving, it is always moving at constant speed (in between collisions) What I do now is this: Let the simulation time step be 1 second (for example). This is the time step simulation is advanced before displaying the new state (unless there is a collision sooner than this). At start of each time step, time for the next collision between any particles or a particle with a wall is determined. Call this the TOC time; let’s say TOC was .5 seconds in this case. Since TOC is smaller than the standard time step, then the system is moved by TOC and the new system is displayed so that the new display shows any collisions as just taking place (say 2 circles just touched each other’s, or a circle just touched a wall) Next, the collision(s) are resolved (i.e. speeds updated, changed directions etc..). A new step is started. The same thing happens. Now assume there is no collision detected within the next 1 second (those 2 circles above will not be in collision any more, even though they are still touching, due to their speeds showing they are moving apart now), Hence, simulation time is advanced now by the full one second, the standard time step, and particles are moved on the screen using 1 second simulation time and new display is shown. You see what has just happened: One frame ran for .5 seconds, but the next frame runs for 1 second, may be the 3rd frame is displayed after 2 seconds, may be the 4th frame is displayed after 2.8 seconds (because TOC was .8 seconds then) and so on. What happens is that the motion of a particle on the screen appears to speed up or slow down, even though it is moving at constant speed and was not even involved in a collision. i.e. Looking at one particle on its own, I see it suddenly speeding up or slowing down, becuase another particle had hit a wall. This is because the display tick is not uniform. i.e. the frame rate update is changing, giving the false illusion that a particle is moving at non-constant speed while in fact it is moving at constant speed. The motion on the screen is not smooth, since the screen is not updating at constant rate. I am not able to figure how to fix this. If I want to show 2 particles at the moment of the collision, I must draw the screen at different times. Drawing the screen always at the same tick interval, results in seeing 2 particles before the collision, and then after the collision, and not just when they colliding, which looked bad when I tried it. So, how do real games handle this issue? How to display things in order to show collisions when it happen, yet keep the display tick constant? These 2 requirements seem to contradict each other’s.

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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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• There are 2 jobs available - which one sounds better all round [closed]

  - by Steve Gates

  I am currently employed at a company where we scrape by each year breaking even, sometimes having a little profit. The development environment is very relaxed and we have a laugh. My colleagues are not interested in improving their knowledge unless they have to, so trying to get them to adopt things like TDD is a non-starter. My development manager is stuck in .Net 2 land and refuses to use things like LINQ. He over complicates architecture and writes very unreadable code, heres an example SortedList<int,<SortedList<int,SortedList<int, MyClass>>>> The MD of the company has no drive and lets the one sales guy bring in the contracts. We are not busy all the time and this allows me time to look at new technology and learn. In terms of using things like TDD, my development manager has no problem with it and can kind of see the purpose of it, he just wont use it himself. This means I am alone in learning new things and am often resorting to StackOverflow to make sure I get things right. The company has a lot of flexibility, I can work from home if needs be and when my daughter was born they let me work from home 1 day a week however they expect this flexibility in return often asking me to travel occasionally on a Friday afternoon for the following week. Sometimes its abroad. We are also pretty much on call 24/5 as we have engineers in various countries. Also we have no testers so most of the testing is done by us developers and some testing by engineers. Either way no-one likes testing! I have been offered a role at a company I worked at 5 years ago. They were quite Victorian in their working practices but it appears to have relaxed now although I suspect still reasonably formal. There is a new team of developers I don't know and they are about to move to new offices. The team lead is a guy that was there when I was and I get the impression he takes his role seriously and likes his formal procedures and documentation. I think some of the Victorian practices may have rubbed off on him. However he did say if things crop up then as long as I can trust the person they can work at home although he prefers people in the office. The team uses SCRUM, TDD and SOLID design principles so they are quite up to date in technology. They are reasonably Microsoft focused. It appears the Technical Director might be the R&D man and research new technology on his own not allowing developers to play with new technology. He possibly might be a super developer and makes all the decisions that no can argue with. They are currently moving to Entity Framework away from NHibernate based on issues that their queries seem to fail sometimes and they feel NHibernate is stagnant. They have analysts and a QA team. The MD is focused and they are an expanding company making profit each year. I'm not sure what the team morale is and whether they have a laugh. When I had a tour around the office they were there in dead silence. I'm really unsure which role is the best for me and going with my gut instinct is useless as I'm not sure what my gut is telling me. Based on the information above which role would you choose and why?

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• Should accessible members of an internal class be internal too?

  - by Jeff Mercado

  I'm designing a set of APIs for some applications I'm working on. I want to keep the code style consistent in all the classes I write but I've found that there are a few inconsistencies that I'm introducing and I don't know what the best way to resolve them is. My example here is specific to C# but this would apply to any language with similar mechanisms. There are a few classes that I need for implementation purposes that I don't necessarily want to expose in the API so I make them internal whereever needed. Generally what I would do is design the class as I normally would (e.g., make members public/protected/private where necessary) and change the visibility level of the class itself to internal. So I might have a few classes that look like this: internal interface IMyItem { ItemSet AddTo(ItemSet set); } internal class _SmallItem : IMyItem { private readonly /* parameters */; public _SmallItem(/* small item parameters */) { /* ... */ } public ItemSet AddTo(ItemSet set) { /* ... */ } } internal abstract class _CompositeItem: IMyItem { private readonly /* parameters */; public _CompositeItem(/* composite item parameters */) { /* ... */ } public abstract object UsefulInformation { get; } protected void HelperMethod(/* parameters */) { /* ... */ } } internal class _BigItem : _CompositeItem { private readonly /* parameters */; public _BigItem(/* big item parameters */) { /* ... */ } public override object UsefulInformation { get { /* ... */ } } public ItemSet AddTo(ItemSet set) { /* ... */ } } In another generated class (part of a parser/scanner), there is a structure that contains fields for all possible values it can represent. The class generated is internal too but I have control over the visibility of the members and decided to make them internal as well. internal partial struct ValueType { internal string String; internal ItemSet ItemSet; internal IMyItem MyItem; } internal class TokenValue { internal static int EQ(ItemSetScanner scanner) { /* ... */ } internal static int NAME(ItemSetScanner scanner, string value) { /* ... */ } internal static int VALUE(ItemSetScanner scanner, string value) { /* ... */ } //... } To me, this feels odd because the first set of classes, I didn't necessarily have to make some members public, they very well could have been made internal. internal members of an internal type can only be accessed internally anyway so why make them public? I just don't like the idea that the way I write my classes has to change drastically (i.e., change all uses of public to internal) just because the class is internal. Any thoughts on what I should do here? It makes sense to me that I might want to make some members of a class declared public, internal. But it's less clear to me when the class is declared internal.

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• MVC Communication Pattern

  - by Kedu

  This is kind of a follow up question to this http://stackoverflow.com/questions/23743285/model-view-controller-and-callbacks, but I wanted to post it separately, because its kind of a different topic. I'm working on a multiplayer cardgame for the Android platform. I split the project into MVC which fits the needs pretty good, but I'm currently stuck because I can't figure out a good way to communicate between the different parts. I have everything setup and working with the controller being a big state machine, which is called over and over from the gameloop, and calls getter methods from the GUI and the android/network part to get the input. The input itself in the GUI and network is set by inputlisteners that set a local variable which I read in the getter method. So far so good, this is working. But my problem is, the controller has to check every input separately,so if I want to add an input I have to check in which states its valid and call the getter method from all these states. This is not good, and lets the code look pretty ugly, makes additions uncomfortable and adds redundance. So what I've got from the question I mentioned above is that some kind of command or event pattern will fit my needs. What I want to do is to create a shared and threadsafe queue in the controller and instead of calling all these getter methods, I just check the queue for new input and proceed it. On the other side, the GUI and network don't have all these getters, but instead create an event or command and send it to the controller through, for example, observer/observable. Now my problem: I can't figure out a way, for these commands/events to fit a common interface (which the queue can store) and still transport different kind of data (button clicks, cards that are played, the player id the command comes from, synchronization data etc.). If I design the communication as command pattern, I have to stick all the information that is needed to execute the command into it when its created, that's impossible because the GUI or network has no knowledge of all the things the controller needs to execute stuff that needs to be done when for example a card is played. I thought about getting this stuff into the command when executing it. But over all the different commands I have, I would need all the information the controller has, and thus give the command a reference to the controller which would make everything in it public, which is real bad design I guess. So, I could try some kind of event pattern. I have to transport data in the event. So, like the command, I would have an interface, which all events have in common, and can be stored in the shared queue. I could create a big enum with all the different events that a are possible, save one of these enums in the actual event, and build a big switch case for the events, to proceed different stuff for different events. The problem here: I have different data for all the events. But I need a common interface, to store the events in a queue. How do I get the specific data, if I can only access the event through the interface? Even if that wouldn't be a problem, I'm creating another big switch case, which looks ugly, and when i want to add a new event, I have to create the event itself, the case, the enum, and the method that's called with the data. I could of course check the event with the enum and cast it to its type, so I can call event type specific methods that give me the data I need, but that looks like bad design too.

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• LINQ to Twitter v2.1.09 Released

  - by Joe Mayo

  Originally posted on: http://geekswithblogs.net/WinAZ/archive/2013/10/15/linq-to-twitter-v2.1.09-released.aspxToday, I released LINQ to Twitter v2.1.09. Here are important new changes. Bug Fixes This is primarily a bug fix release. Most notably, there were authentication problems in WinRT apps. This is now fixed. New Features One new feature is the addition of ApplicationOnlyAuthentication for WinRT. It is fully async.  Here’s how it works: var auth = new WinRtApplicationOnlyAuthorizer { Credentials = new InMemoryCredentials { ConsumerKey = "", ConsumerSecret = "" } }; if (auth == null || !auth.IsAuthorized) { await auth.AuthorizeAsync(); } var twitterCtx = new TwitterContext(auth); (from search in twitterCtx.Search where search.Type == SearchType.Search && search.Query == SearchTextBox.Text select search) .MaterializedAsyncCallback( async response => await Dispatcher.RunAsync( CoreDispatcherPriority.Normal, async () => { Search searchResponse = response.State.Single(); string message = string.Format( "Search returned {0} statuses", searchResponse.Statuses.Count); await new MessageDialog(message, "Search Complete").ShowAsync(); })); It’s called the WinRtApplicationOnlyAuthorizer. You only need two tokens, ConsumerKey and ConsumerSecret, which come from your Twitter API application settings page. Note: You need a Twitter Application, which you can create at https://dev.twitter.com/. The MaterializedAsyncCallback materializes your query and handles the response. I put everything together in a lambda for demonstration purposes, but you can always replace the callback with a handler of type Action<TwitterAsyncResponse<IEnumerable<T>>>, where T is Search for this example. On the Horizon The next version of LINQ to Twitter is in development. I discussed it at LINQ to Twitter Async. This isn’t complete, but you can download the source code at the LINQ to Twitter site on CodePlex. I’ve competed all the spikes for what I thought would be the hard parts and now have prototypes of queries and commands working. This would be a good time to provide feedback if there are features in the current version that you think could be improved. The current driving forces for the next version will be async and PCL.   @JoeMayo

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• How to snap a 2D Quad to the mouse cursor using OpenGL 3.0/WIN32?

  - by NoobScratcher

  I've been having issues trying to snap a 2D Quad to the mouse cursor position I'm able : 1.) To get values into posX, posY, posZ 2.) Translate with the values from those 3 variables But the quad positioning I'm not able to do correctly in such a way that the 2D Quad is near the mouse cursor using those values from those 3 variables eg."posX, posY, posZ" I need the mouse cursor in the center of the 2D Quad. I'm hoping someone can help me achieve this. I've tried searching around with no avail. Heres the function that is ment to do the snapping but instead creates weird flicker or shows nothing at all only the 3d models show up : void display() { glClearColor(0.0,0.0,0.0,1.0); glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); for(std::vector<GLuint>::iterator I = cube.begin(); I != cube.end(); ++I) { glCallList(*I); } if(DrawArea == true) { glReadPixels(winX, winY, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ); cerr << winZ << endl; glGetDoublev(GL_MODELVIEW_MATRIX, modelview); glGetDoublev(GL_PROJECTION_MATRIX, projection); glGetIntegerv(GL_VIEWPORT, viewport); gluUnProject(winX, winY, winZ , modelview, projection, viewport, &posX, &posY, & posZ); glBindTexture(GL_TEXTURE_2D, DrawAreaTexture); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB, DrawAreaSurface->w, DrawAreaSurface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, DrawAreaSurface->pixels); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, DrawAreaTexture); glTranslatef(posX , posY, posZ); glBegin(GL_QUADS); glTexCoord2f (0.0, 0.0); glVertex3f(0.5, 0.5, 0); glTexCoord2f (1.0, 0.0); glVertex3f(0, 0.5, 0); glTexCoord2f (1.0, 1.0); glVertex3f(0, 0, 0); glTexCoord2f (0.0, 1.0); glVertex3f(0.5, 0, 0); glEnd(); } SwapBuffers(hDC); } I'm using : OpenGL 3.0 WIN32 API C++ GLSL if you really want the full source here it is - http://pastebin.com/1Ncm9HNf , Its pretty messy.

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• PCI Encryption Key Management

  - by Unicorn Bob

  (Full disclosure: I'm already an active participant here and at StackOverflow, but for reasons that should hopefully be obvious, I'm choosing to ask this particular question anonymously). I currently work for a small software shop that produces software that's sold commercially to manage small- to mid-size business in a couple of fairly specialized industries. Because these industries are customer-facing, a large portion of the software is related to storing and managing customer information. In particular, the storage (and securing) of customer credit card information. With that, of course, comes PCI compliance. To make a long story short, I'm left with a couple of questions about why certain things were done the way they were, and I'm unfortunately without much of a resource at the moment. This is a very small shop (I report directly to the owner, as does the only other full-time employee), and the owner doesn't have an answer to these questions, and the previous developer is...err...unavailable. Issue 1: Periodic Re-encryption As of now, the software prompts the user to do a wholesale re-encryption of all of the sensitive information in the database (basically credit card numbers and user passwords) if either of these conditions is true: There are any NON-encrypted pieces of sensitive information in the database (added through a manual database statement instead of through the business object, for example). This should not happen during the ordinary use of the software. The current key has been in use for more than a particular period of time. I believe it's 12 months, but I'm not certain of that. The point here is that the key "expires". This is my first foray into commercial solution development that deals with PCI, so I am unfortunately uneducated on the practices involved. Is there some aspect of PCI compliance that mandates (or even just strongly recommends) periodic key updating? This isn't a huge issue for me other than I don't currently have a good explanation to give to end users if they ask why they are being prompted to run it. Question 1: Is the concept of key expiration standard, and, if so, is that simply industry-standard or an element of PCI? Issue 2: Key Storage Here's my real issue...the encryption key is stored in the database, just obfuscated. The key is padded on the left and right with a few garbage bytes and some bits are twiddled, but fundamentally there's nothing stopping an enterprising person from examining our (dotfuscated) code, determining the pattern used to turn the stored key into the real key, then using that key to run amok. This seems like a horrible practice to me, but I want to make sure that this isn't just one of those "grin and bear it" practices that people in this industry have taken to. I have developed an alternative approach that would prevent such an attack, but I'm just looking for a sanity check here. Question 2: Is this method of key storage--namely storing the key in the database using an obfuscation method that exists in client code--normal or crazy? Believe me, I know that free advice is worth every penny that I've paid for it, nobody here is an attorney (or at least isn't offering legal advice), caveat emptor, etc. etc., but I'm looking for any input that you all can provide. Thank you in advance!

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• Understanding exceptional cases

  - by Justin

  I've been studying the use of exceptions in various php projects (such as Doctrine and Zend Framework). Exceptions seem to be thrown when unordinary input/state occurs. A perfect example is Doctrine throwing an exception when you try to use a invalid query string. I think the creators of the doctrine api understood that first, you can't query data by using an invalid DQL statement, and a developer should immediately be warned that an error has occurred, rather then letting execution continue with the possibility of an error code going un-checked. I also bet that this simplifies reading the code. I can't think of a situation where you would want to use an invalid DQL statement, except unit testing. Since this is true, it's better to avoid plaguing a bunch of code with null/error checks and use exceptions. I've read in books that exceptions shouldn't be thrown when validating dating user input. I've seen examples where of where the guideline is broken. One example is the Zend framework. If supplying an invalid controller or action name, an exception is thrown. Unlike doctrine, the user has more direct control over this sort of input. I know you can configure an error controller and set up a 404 message or what have you, but I'm curious why they have used an exception in this scenario? I guess you can argue the Zend Framework does not know how to continue processing the quest. One last example Is I wrote a function to return some html based on a given resource type. This resource type is hard-coded and sent when a user interacts with a web site (such as clicking a button to display the form to input data). I don't expect users to be mucking around with the request type. Under normal operating conditions, the resource type should be valid. To clean up some logic, I was going to throw an exception if a particular form wasn't found. This is mainly to find the correct form associated with a resource type so proper validation can occur. Does this sound like a valid use case for an exception? Right now it's pretty trivial, but I do plan to implement a restful consumer and re-using a function to map resources to their validation services would be very useful. I can then catch the exception and based on the consumer, return an error message suitable for the request type...

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• What will be the better way for data retrieval on application that needs to handle limited amount of data.?

  - by Milanix

  This is not really a coding question since, I am not adding any code in here. Since, adding my code snippets itself would make this question really long. Instead, I am pretty interested in knowing a better ways for data retrieval on application that needs to handle limited amount of data which isn't updated regularly. Let's take this example: I am writing an application which gets a schedule as an XML from server. I have written a logic in order to parse XML version and update database only if the version is newer than the local version. Although the update is checked automatically/manually on daily basis based on user preference, the actual version update happens only once per few months or so. Since, this is done by some other authority which doesn't provide API but, rather inform publicly on their changes. The actual XML contains a "(n number of groups)(days in a week) (n number of schedule)" . The group is usually 6 and the number of schedule is usually 2. So basically there would usually be only around 100 strings. Now although I have used SQLite at the moment. I want to know how to make update on database. Should I show progress dialog that the application is updating and exit the app when it's done? Since, my updates are infrequent i don't think this will really harm user experience but, is there any better ways to do it? Because I don't want update to be made when user is searching which is done using database. This will cause an database already open exception. Atleast I have faced this problem before. Is it better to rather parse XML every time when user wants to view certain things or to use SQLite? Since, I make lots of use of adapter in my app to create lists, will that degrade the performance? It would really be a great help if anyone can give me better overview about it. Or may be counter argument against each. Many thanks!

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• How best to look up objects by label?

  - by dsollen

  I am writing the server backed by a pre-written API. I'm going to get a number of strings representing ports, signals, paths, etc etc etc. I need to look up the object associated with a given label, these objects are all in memory (no sql magic to do this for me). My question is, how best do I associate a given unique label with the mutable object it represents? I have enough objects that looking through every signal or every port to find the one that matches is possible, but may be slightly too slow. To be honest the direct 'look at every object' method is probably good enough for so small a body of objects and anything else is premature optimization, but I still am curious what the proper solution would be if I thought my signals were going to grow a bit larger. As I see it there are two options available. First would be to to create a 'store' that is a simple map between object and label. I could have it so that every time I call addObject the object is automatically saved into a hashmap or the like. This works, but relies on my properly adding and deleting each object so the map doesn't grow indefinitely. The biggest issue to me is that this involves having some hidden static map in my ModelObject class that just feels...wrong somehow. The other option is to have some method that can interpret the labels. All of these labels are derived from the underlying objects. So I can look at the signal label, for instance, and say "these 20 characters are the port" to figure out what port I need. This would allow me to quickly figure out what I need. However, if the label method is changed the translateLabelToObject method needs to be updated as well or everything breaks. Which solution is cleaner, or possibly a cleaner solution than either of above? For the record I'm working with sufficient number of variables to make direct comparison a little slow, but not enough to be concerned about memory overhead, written in java. All objects that have labels I need to look up extend the same parent class.

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• Asus X202e VivoBook, dual boot. How to get around UEFI and have Win8 & Ubuntu?

  - by Nukeface

  I've gotten my hands on an Asus Vivobook X202e. I like it, handy to use, small, etc etc. Oh, it's the i3 core version. For school I still need Windows * sigh * for the .NET development. (I know, possible in Ubuntu, this n that, but for ease atm wanting to keep it with Win8). So. How to install both on this little thing? I've found a way into the BIOS (before splash screen, mash F2. Works only after reboot, not cold boot). But the whole boot loading setup is different than from what I know, and I must've messed up something because it's been "Attempting Repairs", "Analyzing hard disk", and a bunch of other things for the past 15 minutes. (All I've done is selected "disabled" on secure boot, picky as ** Microsoft). Keeping the original Windows installation is of no concern. Found the product key already and have a clean install waiting. BTW, not trying to leech knowledge, even though first question and no answers. I'm more and more active on Stackoverflow. But, especially due to secure boot and windows 8, I'm going over to Ubuntu. Well, more and more anyway, I like my Windows based games as well ;) UPDATE Managed to do a clean install of Windows 8 Pro. After disabling Secure Boot, also had to disable fast boot, and enable Launch CSM, leaving the option which appeared (Launch PXE OpROM) disabled. Then I rebooted, with the USB Boot drive I created using the Windows 7 USB DVD Download Tool (scroll down for download link), provided by Microsoft. During the installation, I chose to install a clean version, therefor deleted the partitions containing current windows files. I left the Recovery partition (you never know...). Of course, the new Windows Installation dit not like this. Apparantly Windows cannot be installed on a GPT hard disk. Remember I hadn't changed the partition table, was still factory default! Minus a few partitions, granted. So deleted ALL partittions, did a format of the disk, created a new partition. Et voila, Windows installation started. FINALLY! WONDROUS After the installation, Windows still had background images located in C:/Users/ ME /AppData/Local/Microsoft/Themes/RoamedThemeFiles/DesktopBackground/ that I had in the previous installation. Before doing: format, delete partition, cascade partitions, create new partition of different size, format partition, install Windows. It managed to keep the images through all that. Anyone got an idea on that one? It also remembered the settings for the Windows Aero theme... UPDATED QUESTION: After all this you'd think I'd have the rest figured out. Wrong. Ubuntu 12.10, 64 bit installation can't read the partitioning of the hdd during the installation. Any ideas on how to fix this so the install for a dual-boot system can proceed? (Preferably without starting anew with Windows as well ;) )

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• How to snap a 2D Quad to the mouse cursor using OpenGL 3.0?

  - by NoobScratcher

  I've been having issues trying to snap a 2D Quad to the mouse cursor position I'm able : 1.) To get values into posX, posY, posZ 2.) Translate with the values from those 3 variables But the quad positioning I'm not able to do correctly in such a way that the 2D Quad is near the mouse cursor using those values from those 3 variables eg."posX, posY, posZ" I need the mouse cursor in the center of the 2D Quad. I'm hoping someone can help me achieve this. I've tried searching around with no avail. Heres the function that is ment to do the snapping but instead creates weird flicker or shows nothing at all only the 3d models show up : void display() { glClearColor(0.0,0.0,0.0,1.0); glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); for(std::vector<GLuint>::iterator I = cube.begin(); I != cube.end(); ++I) { glCallList(*I); } if(DrawArea == true) { glReadPixels(winX, winY, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ); cerr << winZ << endl; glGetDoublev(GL_MODELVIEW_MATRIX, modelview); glGetDoublev(GL_PROJECTION_MATRIX, projection); glGetIntegerv(GL_VIEWPORT, viewport); gluUnProject(winX, winY, winZ , modelview, projection, viewport, &posX, &posY, & posZ); glBindTexture(GL_TEXTURE_2D, DrawAreaTexture); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB, DrawAreaSurface->w, DrawAreaSurface->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, DrawAreaSurface->pixels); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, DrawAreaTexture); glTranslatef(posX , posY, posZ); glBegin(GL_QUADS); glTexCoord2f (0.0, 0.0); glVertex3f(0.5, 0.5, 0); glTexCoord2f (1.0, 0.0); glVertex3f(0, 0.5, 0); glTexCoord2f (1.0, 1.0); glVertex3f(0, 0, 0); glTexCoord2f (0.0, 1.0); glVertex3f(0.5, 0, 0); glEnd(); } SwapBuffers(hDC); } I'm using : OpenGL 3.0 WIN32 API C++ GLSL if you really want the full source here it is - http://pastebin.com/1Ncm9HNf , Its pretty messy.

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• Development Approach: User Interface In or Domain Model Out?

  - by Berin Loritsch

  While I've never delivered anything using Smalltalk, my brief time playing with it has definitely left its mark. The only way to describe the experience is MVC the way it was meant to be. Essentially, all the heavy lifting for your application is done in the business objects (or domain model if you are so inclined). The standard controls are bound to the business objects in some way. For example, a text box is mapped to an object's field (the field itself is an object so it's easy to do). A button would mapped to a method. This is all done with a very simple and natural API. We don't have to think about binding objects, etc. It just works. Yet, in many newer languages and APIs you are forced to think from the outside in. First with C++ and MFC, and now with C# and WPF, Microsoft has gotten it's developer world hooked on GUI builders where you build your application by implementing event handlers. Java Swing development isn't so different, only you are writing the code to instantiate the controls on the form yourself. For some projects, there may never even be a domain model--just event handlers. I've been in and around this model for most of my carreer. Each way forces you to think differently. With the Smalltalk approach, your domain is smart while your GUI is dumb. With the default VisualStudio approach, your GUI is smart while your domain model (if it exists) is rather anemic. Many developers that I work with see value in the Smalltalk approach, and try to shoehorn that approach into the VisualStudio environment. WPF has some dynamic binding features that makes it possible; but there are limitations. Inevitably some code that belongs in the domain model ends up in the GUI classes. So, which way do you design/develop your code? Why? GUI first. User interaction is paramount. Domain first. I need to make sure the system is correct before we put a UI on it. There's pros and cons for either approach. Domain model fits in there with crystal cathedrals and pie in the sky. GUI fits in there with quick and dirty (sometimes really dirty). And for an added bonus: How do you make sure the code is maintainable?

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• Java EE 6?????????????? &quot;?&quot;????? ?????????????|WebLogic Channel|??????

  - by ???02

  ?Oracle WebLogic Server 12c??????????????????????Java EE?????Java EE 6??????????????????????????????Java EE 6?????????WebLogic Server 12c??????????Java????????????????????? 1?25????????Oracle WebLogic Server 12c Forum - ????????Java??????????? -?????WebLogic Server 12c??????? Java EE 6?? ~Java EE 6???????????????????~????????·???????????????????????????Java?????????????Java EE 6?WebLogic Server??????????????2??????????(???)??1????????Java EE????????????·?????????2????　???·??????????????·???Java?????????????????Java EE 5?????????????UFJ???????????????IT??????? ????????????????????????WebLogic Server???????????????????????????????????·??????????????????????????IT???????????·?????Publickey??????????????3????????????????????????????　??WebLogic Server?Java EE??????????????????????????????2??????2011?9???????????????Java EE?????????????????????????Java EE?????????????????????????????????Java EE??????????????????????????????????????????Java EE??????????????·????????????????????????????????????????????????¦?????WebLogic & Java EE???????????????　?????????Java EE?????????????　?????????·?????????????????2011?10???????????????????JavaOne 2011?????????????Publickey???????Java EE???????·????????????????????????????????????????????????Java EE?????????????????????????　JavaOne 2011???????????(??????)?????Java???????????????????????Java??????????????????????????????????Java EE 6????????? ????????　??????·?????????????????????????????????Java EE 6????????????WebLogic Server 12c??????Java EE?????Java EE 6??????????????????Java????????????????????????????????Java??????????????????????????　??????????????????Java EE 6??Java EE?????????????????????????　?J2EE 1.4???Java EE???????????????????????????????????????Java EE 5?????????Java EE 6???????????????????????????????????????????????????Struts?Spring????????????????????????????????????????????????????(???)　????????????????????????????JavaServer Faces(JSF)??????????????????????????????????????????????Java EE 6?????JSF 2.0?????????????????????????????????·?????????????????JSR-299:Context and Dependency Injection for Java EE Platform(CDI)????????????????????·??????????????????Java EE 6?????????1???????????????????????????　????????Java EE 6??????????4????????????????????????????????????????????????????????????????????????????????(IDE)?????????????????　1?????????????????????????????????????????????Java EE 7??8????????????Java EE 6????????????????????????????????????????????????　?????????????????????????????????????????????????????????Java EE?????????????????????????(???)??????????????　3??????????????????????????????????????????JAX-RS???WS-I Basic Profile????JAX-WS??????????????????　???4???IDE???????????NetBeans???????????????????Java EE 6?NetBeans?GlassFish??????????????????????Eclipse????IDE??????????????????????????????　????????????Java EE 6???????????????·??????????????????????????????????????????????????????????????????????　?Java EE 5???????????·?????3??(???)????????????????????????????????????????3????????????????????????????????Java EE 6???????????????????????CDI?????API???????????????????????Ruby on Rails?????????????????????????????????????????????????????????????(???)　???J2EE 1.4?????????????Java EE 6?????????????????????????????????????????????????Java EE 6????????????????????????????????????????????????????·????????WAR??????????????????????Java EE 6????????????????????????????????????J2EE 1.4??????10??1????????????????????????????Java EE???Java EE 6???????????????????　??????????????·???????????Java EE??????????J2EE 1.4?????????????????????"????Java EE??"???????????????Java EE 6???????????????????????????????　?????J2EE 1.4???????Java EE 6???????????????????????????????????????????Java EE?????????????????????????????????????????????????　??????????UFJ???????????????????????????Java EE 5????????????????????????????????????????????????????????????????????????　??Java EE 5????????J2EE 1.4??????????????POJO???????????????????????????????????????????????????????Java EE 5???????????????????????????????????????????????????????????　???J2EE 1.4????????????????Java EE 6????????????????????Dependency Injection(DI)?Aspect Oriented Programming(AOP)??????????????????????????(???)¦??????UFJ??????????????????????·?????WebLogic Server????????――????? ?????? ????? 2011?????　?????????????????????????????????????????????????????Java EE 6??????????????????????????(????????·???????????????????)???????????Java EE 6???????????　?????J2EE 1.4??Java EE 6????????????????????????????????J2EE 1.4+???????????????????????????????????????????????????????????????　????Spring????????????????????????????????????????"???"??????Java EE 6??????????????????????????????????????????　?Spring???????????????????????????????????????????????Java EE 6???????????????????EJB 3????????????????????????????EJB 3????????Java EE 6??????????????????????EJB?????????????????????????EJB????????????????(???)　????????JSF 2.0?Facelet???????????????????????????????????????????????????Struts?????????????JSF 2.0+Facelet???????????? "???????????"??"????????"?????????????????????????????????????????　?????????????????????????????????Java EE?????????Java EE 6????????????????????Java EE??????????????"??"?"???????"????????????????????????????????????????Java EE 6???????"?????????"????????????????????????????????????????????Java EE 6??????1???????Java EE?????????????????????????????　???????Java EE??????.NET??????????????????????Web????/????????·???????????????????????????????.NET????????????????????????????????Spring?Ruby on Rails???????????????Java EE 6??????????????????????????????????!???????????????????　????????????????????????Java EE?????????????????????????? Java EE????????????? WebLogic Server??????――??????·???????????????????????????????????????3?(?????)???

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• JEditorPane Code Completion (Part 2)

  - by Geertjan

  Figured it out! No need to create a fake Java file, unlike what I said in part 1, no need to depend on all the Java Editor modules, if you use DialogBinding.bindComponentToDocument, instead of DialogBinding.bindComponentToFile: public final class CountryEditorTopComponent extends TopComponent {     public CountryEditorTopComponent() {         initComponents();         setName(Bundle.CTL_CountryEditorTopComponent());         setToolTipText(Bundle.HINT_CountryEditorTopComponent());         EditorKit kit = CloneableEditorSupport.getEditorKit("text/plain");         jEditorPane1.setEditorKit(kit);         DialogBinding.bindComponentToDocument(jEditorPane1.getDocument(), 0, 0, jEditorPane1);         jEditorPane1.setText("Egypt");     } The above requires a dependency on Editor Library 2, which is where DialogBinding is found. Aside from that, you need all the dependencies required by the Code Completion API, as described in the Code Completion tutorial on the NetBeans Platform Learning Trail. Once you've done that, go to the Project Properties dialog of the application and then in the "ide" cluster, include "Plain Editor" and "Plain Editor Library". I.e., two additional JARs only. These two are needed because you've set the MIME type to "text/plain", which is needed because DialogBinding expects the JEditorPane to have a MIME type. And now everything works. Press Ctrl-Space in your JEditorPane and, because your CompletionProvider is registered in "text/x-dialog-binding" (via the annotation on CompletionProvider), your completion items are displayed. (The only MIME type for binding a document to a component, by default, is "text/x-dialog-binding", which means the next step is for someone to figure out how to support multiple different of such MIME types, since each JEditorPane in your application is likely to require its own specific code completion support.) I think this is a really workable solution for real scenarios where JEditorPanes in NetBeans Platform applications require code completion.

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• ??????!?Java??????????

  - by rika.tokumichi

  Text by ?? ??(?????????? Fusion Middleware?????? - ???????????) IT??????????????????????????? ????????? ???????????? ???????????????????????????1??????????????????????????????????????????????? ???:?????????? Oracle Direct Seminar ?Java ?????????????????????????(2009?) ?????????????????·???????????????????????????????????????????????????????????????????????????????????????????????????????????? ???????????????????????????? ??????????????Java???????????????????? ???????????Java??????? ??????????????????????Java???????????????? ¦Apache Struts Java ?Web?????????????????????????????????????????????????? ???????????????????????????????????????????????? >????? ¦Spring Framework Dependency Injection(DI; ??????)?????????????????????????? DI???????????????????????????????????????????????Java????????????????????????????????????????? >????? >Oracle and Spring(??) ¦Apache log4j ?????????????????? ??????(???????)????????????????????????????????Apache log4j????????????????????????????????????????? ???Microsoft .Net(log4Net)?C++(log4cxx)?PHP(log4php)??Java??????????????????????????? >????? ¦JUnit JUnit?Java????????????????????????????????????????????????????????? Eclipse?NetBeans?JDeveloper??????????????????????????????????????????????????????????? >????? ?????????Java??????? ??????????????Java?????????????????? ¦Oracle TopLink ?????????Java???????????????????????????????????????????????????????????????????????????????????????? ??????????????????????O/R(Object/Relational)?????·?????????Oracle TopLink???????? O/R???????????Java Persistence API(JPA)???Java?????????????????Oracle TopLink????????????????????????????????????????? >????:Oracle TopLink >??????? ¦Oracle Application Development Framework(ADF) Web??????/?????????????????(???????)?????????????????????????????????? ?????????????????????????????????????????????????? Oracle ADF????????????·????????????????????????????Oracle TopLink?Apache Struts?EJB?JavaServer Faces???????????????????????????????????????????????? >????:Oracle Application Development Framework >??????? >Oracle ADF Overview Demo(??) ¦Oracle ADF Faces Oracle ADF Faces??JavaServer Faces(JSF)?????????·???????????????????????????? Ajax????????150???UI????????ADF Faces Rich Client??????????·?????????ADF Data Visualization Components???????????????? >????:Oracle ADF Faces Rich Client Components >??????? >Oracle ADF Faces Components Hosted Demo >Oracle JDeveloper 11g??????? ¦Oracle WebCenter Framework Oracle ADF?????????·????????Enterprise 2.0???????????????????Oracle WebCenter Framework??? ????????????????????????????????????????????????????????????????????????????? >????:Oracle WebCenter Suite >??????? ??????????????WebLogic Server?????

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• ????·???????! ?WebLogic Scripting Tool????WebLogic Server???/???????|WebLogic Channel|??????

  - by ???02

  Web???????????/?????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????WebLogic Server?????????????????WebLogic Scripting Tool??????????2011?11????????Oracle DAB & Developers Days 2011?????????????????????????!WebLogic Scripting Tool?????WLS???·????????????WebLogic Scripting Tool?????????????????(???)?WebLogic Server???/????????WebLogic Scripting Tool　WebLogic Scripting Tool(WLST)??????????????WebLogic Server???????????????????????????????????????????????????????????????????????????WLST???????????????????????????????????????????????????????????????????????????WebLogic Server?????????????????????　WLST??Java?Python?????Jython?????????????WebLogic Server?MBean?????????????????????MBean???"????(Managed)Bean"??????WebLogic Server??????????????Java??????????????JDBC????·???????????MBean??JMS(Java Message Service)????????MBean????????MBean???????????MBean???????????????????????????????WLST????UNIX??????????cd???ls?????????????????????????????MBean???　MBean??????MBean?????????????MBean??2?????????????????????MBean?????????????????????????????????????????????????????????????????????????MBean?????·?????????????????????????????????????　???WebLogic Server?MBean??????(MBean???)????????????????????MBean?????????????????MBean?????????????????????MBean????????????????????????????????????????MBean???????　????????MBean?????????????????????????????????????MBean????????????????WLST?????????　WebLogic Server?????????MBean?WLST??????????????Java???????????????????????????????????????????????????????????????????·??????????WLST???????????????????????????????????????????????????????????????????/????????????　WLST????????????????????????2??????????????????????????????????[????????]java weblogic.WLST[???????????]java weblogic.WLST XXXX.py　?????????i??????????????????????????????????????????[????????????????]java weblogic.WLST -i XXX.py　???WLST???????????????·???????????·????????????????????·????????????????????????MBean??????????MBean???????????MBean??????????????????????·????????????????????????????????????????????????????????????????????????????????????????????·?????????　???????????????????WebLogic Server???????????????????????????????????????????????WebLogic Server???????????????????WLST ???????????????????????WLST????????????????????????????????????Java????????????Python??????????????????　???????????????????????????cmo???????????????????MBean???????????????????????????????????WLST??????????serverRuntime()??????????????????????MBean??????????????cmo????????????????????????MBean???API???????????????????????????????　??1?????????????????????????????????????????????????????????????????????????????????????????????????????????????WLST????????????????????????????????????????MBean????　??????WLST????????????????MBean?????????????????????? ?????????????????????????????????????????????MBean???????????????WLST?MBean?????????????????????????MBean?????????????????????????????????　???MBean?????????????????????????????????????????Java????????????????????????????????????????????????·?????????????????????????????????????????MBean??????????????????　?????????MBean?????????????????MBean????????????????????????????Java???????????JVM Runtime MBean???Heap Free Current????????????????????????????Read Only??????????long????????????????　?????MBean?????????????????RuntimeMBean??????????????????JVMRuntimeMBean??????RuntimeMBean???????????????MBean?????????????????????????MBean?????????WLST??????????????????????????????Java???????????[???????????????]wls:/mydomain/serverConfig> serverRuntime()???????serverRuntime???????????????ServerRuntimeMBean???????????????????[find() ????? MBean ?????????]wls:/mydomain/serverRuntime> find('JVMRuntime')Finding 'JVMRuntime' in all registered MBean instances .../ JVMRuntimecom.bea:ServerRuntime=AdminServer,Name=AdminServer,Type=JVMRuntime ?[getPath() ???????????????]wls:/mydomain/serverRuntime> getPath('com.bea:ServerRuntime=AdminServer,Name=AdminServer,Type=JVMRuntime')'JVMRuntime/AdminServer'[cd() ???????????]wls:/mydomain/serverRuntime> cd('JVMRuntime/AdminServer')wls:/mydomain/serverRuntime/JVMRuntime/AdminServer>[get() ????? ls() ????? MBean ?????? ]wls:/mydomain/serverRuntime/JVMRuntime/AdminServer> get('HeapFreeCurrent')152358560Lwls:/mydomain/serverRuntime/JVMRuntime/AdminServer> ls()-r-- HeapFreeCurrent 152358560-r-- HeapFreePercent 79-r-- HeapSizeCurrent 259588096-r-- HeapSizeMax 518979584-r-- Type JVMRuntime...　??????????????????????????????from java.lang.Thread import *connect('username','password','t3://localhost:7001')serverRuntime()cd('JVMRuntime/AdminServer')print('---- HeapFreeCurrent ---')while(1):　　 print(get('HeapFreeCurrent'))　　 Thread.sleep(60000)　??????????3?????????????????????MBean????????????????????????While???Heap Free Current??????????Java?????sleep??????????????????????????WLST?2?????　????????????·?????????WLST?2????????????　1????????????????????????????????????????????????????????????WLST???????????????????????????????????????????WebLogic Server?????????????????????????????????????????????????????????????????????　???2???????????????????????????????????????????????????????????????????????????????　????????????????????????HTTP???????????????????????????????????????????????????????????????????????????????????????????????????????????HTTP???????????????????????????????????????????????????????????　????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????WLST????????????????　???2??????????·?????????????????PDF????????????????????????????????????????????Oracle Technology Network:?????????????! WebLogic Scripting Tool?????WLS???·?????···????·????????????????????

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• ???????Java EE??????WebLogic Server 12c??????3???????Oracle WebLogic Server 12c Forum?????|WebLogic Channel|??????

  - by ???02

  ???????2012?2?7??Java EE??????????·???????Oracle WebLogic Server 12c?????????????????????1?25????????????Oracle WebLogic Server 12c Forum - ????????Java??????????? -????Java EE 6?Java SE 7???????Java???????WebLogic Server 12c?????????????????·?????????????????????3??????????????????????(???)?Java EE 6?Java SE 7??????200????????????WebLogic Server 12c　???????????Oracle Corporation?WebLogic Server???????Fusion Middleware?????????·??????????????·???????????·????????????????????·???????????/????????Oracle Fusion Middleware??????WebLogic Server??????????????????????　?Fusion Middleware?????WebLogic Server?Coherence?Tuxedo??????????·??????????????????????????????????????????????Traffic Director?Virtual Assembly Builder???????Cloud Application Foundation??????????Cloud Application Foundation??Fusion Middleware?Fusion Application??????·???????????·????????????????????(?????)　?????????????1???????????WebLogic Server 12c??Java EE 6?Java SE 7???????Java?????????????????????????????????????200??????????????????　???????????????????????Java EE 6??????????????????????????????????????????????????????????????????????????5??????　????????·??????????????????Java EE 6?Java SE 7?????????????????????????????????????Oracle Real Application Clusters(RAC)?????????????????????????????????????????????????????????????　????????????????SPECjEnterprise2010????????????????????????????????????????????·????(Engineered Systems)?????????Oracle Exalogic Elastic Cloud????????????????????????　???????????????????????????????Oracle Enterprise Manager Cloud Control 12c???????????????????????·??????????????????????????????????????????????????????????　????WebLogic Server????????GlassFish?????????????????JBoss?WebSphere?????????/???????????·?????WebLogic Server 12c????????????????????????????·????????????　???????IDC?????????????WebLogic Server????????????????????????????????????????????????????????·???????????????????WebLogic Server 12c??????????????????·??????????????????????WebLogic Server 12c???????????????????????????(?????)¦????????????! ??????????????????WebLogic Server 12c??????WebLogic Server 12c??????3?????　???????????????????????Fusion Middleware???????????????????????????????WebLogic Server 12c??????3???????????????????????WebLogic Server 12c???????????????WebLogic Server 12c???????1――???Java?????????????　????WebLogic Server 12c???????????Java EE 6?Java SE 7????????????????????????????????Java EE??????????????????????????????????????Java EE????????????????????????????Java EE?????????????1??????????????????????????????????????????????????(???????·?????????????????)?????????????????????????????????????????　?Java EE 6????Java EE?????????1???????????Java?????????????????????????????????????????????????????????·??????(OSS)???????????????????????????????????????Java EE 6?Java SE 7??????Java???????????????????????????????????????????????????(???) ???????????????????????Fusion Middleware???????????????????????????????WebLogic Server 12c??????3???????????????????????WebLogic Server 12c???????????????WebLogic Server 12c???????1?????Java????????????? ????WebLogic Server 12c???????????Java EE 6?Java SE 7????????????????????????????????Java EE??????????????????????????????????????Java EE????????????????????????????Java EE?????????????1??????????????????????????????????????????????????(???????·?????????????????)????????????????????????????????????????? ?Java EE 6????Java EE?????????1???????????Java?????????????????????????????????????????????????????????·??????(OSS)???????????????????????????????????????Java EE 6?Java SE 7??????Java???????????????????????????????????????????????????(???)--WebLogic Server 12c???????2:??????????????????(??????????????????)　???WebLogic Server 12c?????2????????????????????????????????????1????????????????OSS??????????????????????????OSS????????????????????????????????????????????????????????????????????????????????????????????OSS?????????????????????????????????????????????????????????????? "???"????????????????　???WebLogic Server 12c?????Java EE 6???JavaServer Faces 2.1?Java Servlet 3.0?EJB 3.1?Java Persistence API 2.0????????????Java EE??????????????????????????????????????????????OSS?????????????????????????????????????????????????????????????????????????Java EE??????????????????????????????·???·?????????????/??????????????????????????????????????????????????????????????????¦?????WebLogic & Java EE???????????　?????????????Java EE?????????????WebLogic Server 12c???????3:?????·???????????????　3?????????????·?????????????????????????????????Oracle RAC????????????Active GridLink for RAC???????WebLogic Server????????1?????????　Active GridLink for RAC ??WebLogic Server???????????WebLogic Suite???????1????WebLogic Server 12c???Web?????·???????????????????????????????HTTP?????????????Oracle RAC?1?????????????????????????·?????????????????????????????????????Oracle RAC??????????????????????Web?????·????????????????????3??1??????????????　???Active GridLink for RAC??????????????????????????????????????????????TCP/IP??????????????????????????·??????????????????????????????????????????????????Oracle RAC????????????????????????????????????????????????????????????·????????????????????????????????????????????????¦????WebLogic?RAC????????????――Active GridLink for RAC????RAC???????????????????????????????????????4????　????????·??????(GC)?????????????????????????????JRockit Real Time?????????????????????????????????????????????????JRockit Flight Recorder????2??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????·??????·????????????????????WebLogic Server?????????????12c??????????????　?Oracle Database????????GC????????????????????????????????????????????·????????????????????WebLogic Server????????????????12c?????????????????????????????????????????????????????????????????????????·?????????????????????????????????????????????????WebLogic Server 12c???????????(???)¦??????????????????????????WebLogic Server????????·??????????――?????·??????·???????????WebLogic??????????????????????????TCO?――????????????????WebLogic???????　???????????????????Cloud Application Foundation???????????WebLogic Server 12c???????????????????????????????????????????????????????????????????????????????????????·??????·????????????????????????????????????????????????????????WebLogic Server 12c??????????????????????????¦WebLogic Server 12c??????·???Oracle Fusion Middleware 11g ??????·??????Oracle OpenWorld Tokyo 2012??????ENGINEERED FOR INNOVATION ??????????????????????????????????????????????????????????????????????????????????WebLogic Server???????????????????????![???????????:4324]??:2012?4?4?(?)~6?(?)??:???? ????? ??????????????49????????????:????Oracle OpenWorld Tokyo 2012???? ~??????~(PDF)Oracle OpenWorld Tokyo 2012????????2?(?????)???

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• Ext JS Tab Panel - Dynamic Tabs - Tab Exists Not Working

  - by Joey Ezekiel

  Hi Would appreciate if somebody could help me on this. I have a Tree Panel whose nodes when clicked load a tab into a tab panel. The tabs are loading alright, but my problem is duplication. I need to check if a tab exists before adding it to the tab panel. I cant seem to have this resolved and it is eating my brains. This is pretty simple and I have checked stackoverflow and the EXT JS Forums for solutions but they dont seem to work for me or I'm being blind. This is my code for the tree: var opstree = new Ext.tree.TreePanel({ renderTo: 'opstree', border:false, width: 250, height: 'auto', useArrows: false, animate: true, autoScroll: true, dataUrl: 'libs/tree-data.json', root: { nodeType: 'async', text: 'Tool Actions' }, listeners: { render: function() { this.getRootNode().expand(); } } }) opstree.on('click', function(n){ var sn = this.selModel.selNode || {}; // selNode is null on initial selection renderPage(n.id); }); function renderPage(tabId) { var TabPanel = Ext.getCmp('content-tab-panel'); var tab = TabPanel.getItem(tabId); //Ext.MessageBox.alert('TabGet',tab); if(tab){ TabPanel.setActiveTab(tabId); } else{ TabPanel.add({ title: tabId, html: 'Tab Body ' + (tabId) + '', closable:true }).show(); TabPanel.doLayout(); } } }); and this is the code for the Tab Panel new Ext.TabPanel({ id:'content-tab-panel', region: 'center', deferredRender: false, enableTabScroll:true, activeTab: 0, items: [{ contentEl: 'about', title: 'About the Billing Ops Application', closable: true, autoScroll: true, margins: '0 0 0 0' },{ contentEl: 'welcomescreen', title: 'PBRT Application Home', closable: false, autoScroll: true, margins: '0 0 0 0' }] }) Can somebody please help?

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• How to mock an SqlDataReader using Moq - Update

  - by Simon G

  Hi, I'm new to moq and setting up mocks so i could do with a little help. Title says it all really - how do I mock up an SqlDataReader using Moq? Thanks Update After further testing this is what I have so far: private IDataReader MockIDataReader() { var moq = new Mock<IDataReader>(); moq.Setup( x => x.Read() ).Returns( true ); moq.Setup( x => x.Read() ).Returns( false ); moq.SetupGet<object>( x => x["Char"] ).Returns( 'C' ); return moq.Object; } private class TestData { public char ValidChar { get; set; } } private TestData GetTestData() { var testData = new TestData(); using ( var reader = MockIDataReader() ) { while ( reader.Read() ) { testData = new TestData { ValidChar = reader.GetChar( "Char" ).Value }; } } return testData; } The issue you is when I do reader.Read in my GetTestData() method its always empty. I need to know how to do something like reader.Stub( x => x.Read() ).Repeat.Once().Return( true ) as per the rhino mock example: http://stackoverflow.com/questions/1792984/mocking-a-datareader-and-getting-a-rhino-mocks-exceptions-expectationviolationexc

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• How do I remedy "Error: Cannot find module 'child-process-close'"?

  - by Tyler Sloan

  I was going about business as usual and about to checkout generator-angular-fullstack. I got no red errors but a message a the end saying Error: Cannot find module 'child-process-close'. I tried many a-thing–uninstalling node, reinstalling, manually getting rid of files and directories in local and/or global paths and tried to make sure Homebrew was the one who installed everything and somehow I've made things worse. (Also, I initially saw errors regarding karma. Everything looked right but it doesn't seem I did any good by throwing commands at it.) I am at a loss. All the stackoverflow questions have been clicked and I'm afraid I've probably tried too many of the suggestions. I cannot install any Yeoman generator. I cannot install anything with npm. When inside the project directory when I run npm install it throws the error. I really have no clue. Is there a way I can basically start over all together? A simple uninstall and install isn't cutting it. Something in the system needs to change but I don't know what. Any ideas?

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