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  • Distributed cache and improvement

    - by philipl
    Have this question from interview: Web Service function given x static HashMap map (singleton created) if (!map.containsKey(x)) { perform some function to retrieve result y map.put(x, y); } return y; The interviewer asked general question such as what is wrong with this distributed cache implementation. Then asked how to improve on it, due to distributed servers will have different cached key pairs in the map. There are simple mistakes to be pointed out about synchronization and key object, but what really startled me was that this guy thinks that moving to database implementation solves the problem that different servers will have different map content, i.e., the situation when value x is not on server A but on server B, therefore redundant data has to be retrieved in server A. Does his thinking make any sense? (As I understand this is the basic cons for distributed cache against database model, seems he does not understand it at all) What is the typical solution for the cache growth issue (weak reference?) and sync issue (do not know which server has the key already cached - use load balancing)? Thanks

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  • Are Promises/A a good event design pattern to implement even in synchronous languages like PHP?

    - by Xeoncross
    I have always kept an eye out for event systems when writing code in scripting languages. Web applications have a history of allowing the user to add plugins and modules whenever needed. In most PHP systems you have a global/singleton event object which all interested parties tie into and wait to be alerted to changes. Event::on('event_name', $callback); Recently more patterns like the observer have been used for things like jQuery. $(el).on('event', callback); Even PHP now has built in classes for it. class Blog extends SplSubject { public function save() { $this->notify(); } } Anyway, the Promises/A proposal has caught my eye. It is designed for asynchronous systems, but I'm wondering if it is also a good design to implement now that even synchronous languages like PHP are changing. Combining Dependency Injection with Promises/A seems it might be the best combination for handling events currently.

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  • iOS NSError with global handler

    - by Sebastian Dressler
    I am in the beginning of programming an iOS app. Having read the Apple guides on how to deal with errors, I got the following most important points: Exceptions are for programmers Use NSError for the user Now, NSError is usually passed as out-argument which can then be used inside and has to be checked by the caller. However, I'm asking myself whether it is a good idea to use a global error handler, say a singleton which wraps around NSError and could be used to trigger errors and error handling from within the called function. Is there anything against that method or would it be a bad practice?

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  • How to properly code in Unity? [on hold]

    - by Vincent B.
    I'm fairly new to Unity (yet I touched it and made a few proto with it) and I'd like to know how I'm supposed to work with it. I'm student in programming so I'm used to C/C++ with SDL/SFML, writing code and only using Input/Graphics/Network libs. I followed a few Unity guides and it was way more around drag & drop on scenes and a bit of scripting to activate it all, which disturbed me. So I fond a way to only use one GameObject and use a Singleton to launch code and display stuff (for 2d games at least). At the end of the day I make games not using "Instantiate" or such at all. Is it the right way ? Am I supposed to do this ? How much are your scenes populated (in a professional environment) ? When should I stop coding and start using the editor ?

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  • What is meant by namespaced content and what advantages does it have?

    - by Geek
    I was reading this blog by James Bennett regarding HTML vs XHTML . He writes : I don’t have any need for namespaced content; I’m not displaying any complex mathematical notation here and don’t plan to, and I don’t use SVG for any images. So that’s one advantage of XHTML out the window. I also don’t have any need for XML tools; all the processing I need to do can be handled by HTML-parsing libraries like BeautifulSoup. That’s the other advantage gone. What does he mean by namespaced content and what advantage does it provide us ?

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  • BeansBinding Across Modules in a NetBeans Platform Application

    - by Geertjan
    Here's two TopComponents, each in a different NetBeans module. Let's use BeansBinding to synchronize the JTextField in TC2TopComponent with the data published by TC1TopComponent and received in TC2TopComponent by listening to the Lookup. The key to getting to the solution is to have the following in TC2TopComponent, which implements LookupListener: private BindingGroup bindingGroup = null; private AutoBinding binding = null; @Override public void resultChanged(LookupEvent le) { if (bindingGroup != null && binding != null) { bindingGroup.getBinding("customerNameBinding").unbind(); } if (!result.allInstances().isEmpty()){ Customer c = result.allInstances().iterator().next(); // put the customer into the lookup of this topcomponent, // so that it will remain in the lookup when focus changes // to this topcomponent: ic.set(Collections.singleton(c), null); bindingGroup = new BindingGroup(); binding = Bindings.createAutoBinding( // a two-way binding, i.e., a change in // one will cause a change in the other: AutoBinding.UpdateStrategy.READ_WRITE, // source: c, BeanProperty.create("name"), // target: jTextField1, BeanProperty.create("text"), // binding name: "customerNameBinding"); bindingGroup.addBinding(binding); bindingGroup.bind(); } } I must say that this solution is preferable over what I've been doing prior to getting to this solution: I would get the customer from the resultChanged, set a class-level field to that customer, add a document listener (or action listener, which is invoked when Enter is pressed) on the text field and, when a change is detected, set the new value on the customer. All that is not needed with the above bit of code. Then, in the node, make sure to use canRename, setName, and getDisplayName, so that when the user presses F2 on a node, the display name can be changed. In other words, when the user types something different in the node display name after pressing F2, the underlying customer name is changed, which happens, in the first place, because the customer name is bound to the text field's value, so that the text field's value will also change once enter is pressed on the changed node display name. Also set a PropertyChangeListener on the node (which implies you need to add property change support to the customer object), so that when the customer object changes (which happens, in the second place, via a change in the value of the text field, as defined in the binding defined above), the node display name is updated. In other words, there's still a bit of plumbing you need to include. But less than before and the nasty class-level field for storing the customer in the TC2TopComponent is no longer needed. And a listener on the text field, with a property change listener implented on the TC2TopComponent, isn't needed either. On the other hand, it's more code than I was using before and I've had to include the BeansBinding JAR, which adds a bit of overhead to my application, without much additional functionality over what I was doing originally. I'd lean towards not doing things this way. Seems quite expensive for essentially replacing a listener on a text field and a property change listener implemented on the TC2TopComponent for being notified of changes to the customer so that the text field can be updated. On the other other hand, it's kind of nice that all this listening-related code is centralized in one place now. So, here's a nice improvement over the above. Instead of listening for a customer, listen for a node, from which the customer can be obtained. Then, bind the node display name to the text field's value, so that when the user types in the text field, the node display name is updated. That saves you from having to listen in the node for changes to the customer's name. In addition to that binding, keep the previous binding, because the previous binding connects the customer name to the text field, so that when the customer display name is changed via F2 on the node, the text field will be updated. private BindingGroup bindingGroup = null; private AutoBinding nodeUpdateBinding; private AutoBinding textFieldUpdateBinding; @Override public void resultChanged(LookupEvent le) { if (bindingGroup != null && textFieldUpdateBinding != null) { bindingGroup.getBinding("textFieldUpdateBinding").unbind(); } if (bindingGroup != null && nodeUpdateBinding != null) { bindingGroup.getBinding("nodeUpdateBinding").unbind(); } if (!result.allInstances().isEmpty()) { Node n = result.allInstances().iterator().next(); Customer c = n.getLookup().lookup(Customer.class); ic.set(Collections.singleton(n), null); bindingGroup = new BindingGroup(); nodeUpdateBinding = Bindings.createAutoBinding( AutoBinding.UpdateStrategy.READ_WRITE, n, BeanProperty.create("name"), jTextField1, BeanProperty.create("text"), "nodeUpdateBinding"); bindingGroup.addBinding(nodeUpdateBinding); textFieldUpdateBinding = Bindings.createAutoBinding( AutoBinding.UpdateStrategy.READ_WRITE, c, BeanProperty.create("name"), jTextField1, BeanProperty.create("text"), "textFieldUpdateBinding"); bindingGroup.addBinding(textFieldUpdateBinding); bindingGroup.bind(); } } Now my node has no property change listener, while the customer has no property change support. As in the first bit of code, the text field doesn't have a listener either. All that listening is taken care of by the BeansBinding code.  Thanks to Toni for help with this, though he can't be blamed for anything that is wrong with it, only thanked for anything that is right with it. 

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  • Using PDO for Data Management

    - by edorahg
    This question is more a design oriented question than a code specific question. I am new to PHP and I am planning to use PDO as a data access layer. Say for instance I have a class called CITY. Now if I need to create an instance of this class, what is the best technique. Should have a singleton DB access class which is used to write and read data from the db layer. OR should I delegate it to the individual class object. For example if I invoke city.save() (city is a class), then the city class will handle the saving of that city object's data into the database. Excuse my ignorance but i have a java background and therefore trying to understand what is the best design principle for data management when using php.

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  • Read a text file and transfer contents to mysql database

    - by Jack Brown
    I need a php script to read a .txt file. The content of the text file are like this: data.txt 145|Joe Blogs|17/03/1954 986|Jim Smith|12/01/1976 234|Paul Jones|19/07/1923 098|James Smith|12/09/1998 234|Carl Jones|01/01/1925 These would then get stored into a database like this DataID |Name |DOB 234 |Carl Jones|01/01/1925 I would be so grateful if someone could give me script to achieve this.

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  • Using Structuremap to manage ObjectContext Lifetime in ASP.NET MVC

    - by Diego Correa
    Hi, what I want to know If there is a way or an good article on how to manage the objectcontext life cycle through structuremap (I saw an example with ninject). Since I'm new to the methods and possibilities of SM I really don't know How/If possible to make it. In the first moment I wanted to make a singleton of the objectcontext per httpcontext. Thanks for any advice.

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  • jQuery animate callback - doesn't complete, no callback?

    - by Mark
    This jsbin demonstrates my problem: http://jsbin.com/aqute4/edit I'm using jQuery animate to kick down some non-css properties ala: http://james.padolsey.com/javascript/fun-with-jquerys-animate/ However, the animate gets very close to the final number, but never actually reaches it! The callback doesn't happen. I need the callback to run. Thanks in advance!

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  • Anchor tag not centered on page after clicking

    - by jennyjune
    I am creating a website that scrolls down to different divs by the use of anchors. However, when I click on a link, that anchored div is not centered on the page. I positioned my divs absolutely but I have no idea if that is affecting it? Anyone have any clue how to get the divs centered using anchors? Please help! <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Jean and James</title> <script src="js/jquery.js" type="text/javascript"></script> <script src="js/jquery.anchor.js" type="text/javascript"></script> <link href="jj_css.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="navigation" align="center"> <a href="#jeanandjames" class="anchorLink">JEAN AND JAMES</a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href="#feature" class="anchorLink">FEATURE PRODUCT</a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href="#contact" class="anchorLink">CONTACT</a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href="#work" class="anchorLink">WORK</a> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </div> <div id="logo"> <img src="logo.gif" /> </div> <a name="jeanandjames" id="jeanandjames"> <div id="jeanandjames" align="center"> <img src="jeanandjames.jpg" /><br /> A boutique design firm specializing in hand crafted products and graphic print work. </div> </a> <a name="feature" id="feature"> <div id="feature"> <img src="baby_bowtie.gif" /> </div> </a> <a name="contact" id="contact"> <div id="contact"> Jean & James Chicago, IL<br /><br /> Donec faucibus nunc eget quam pretium vel porttitor diam venenatis. Nullam egestas, quam et congue rutrum, diam mauris tempus urna, eget mattis quam quam ac erat. Vivamus lobortis nunc quis arcu lobortis vel euismod felis tincidunt. Etiam facilisis, metus et mattis tempor, erat ipsum tincidunt diam, nec aliquam velit risus a lacus. Duis tempor bibendum felis, adipiscing mattis lorem eleifend fermentum. Nulla adipiscing consequat enim id sagittis. Suspendisse venenatis scelerisque orci, sed sollicitudin erat egestas in. Nunc orci leo, adipiscing vel consectetur sit amet, rutrum vitae nulla. Mauris ut mi nunc, non condimentum risus. Donec varius consequat quam vel lacinia. Etiam et eros nec quam egestas pellentesque sit amet ac nunc. </div> </a> </body> </html> And here is my css: #navigation A:link {text-decoration: none; color: #FFFFFF;} #navigation A:visited {text-decoration: none; color: #FFFFFF;} #navigation A:active {text-decoration: none; color: #FFFFFF;} #navigation A:hover {text-decoration: none; color: #CC9;} #navigation { position: fixed; top: -1px; left: -1px; width: 100%; height: 20px; padding: 10px; z-index: 10; font-family: Arial, Helvetica, sans-serif; font-size: 12px; background-color: #000; color: #FFF; } #logo { position: fixed; top: 150px; left: 50px; } #jeanandjames { position: absolute; top: 230px; left: 200px; font-family: Arial, Helvetica, sans-serif; font-size: 12px; } #feature { position: absolute; top: 600px; left: 200px; } #contact { position: absolute; top: 1200px; left: 200px; width: 500px; font-family: Arial, Helvetica, sans-serif; font-size: 12px; }

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  • transformation of UML Diagrams to specification Z using xsl transformation

    - by Mona
    hi. I'm trying to transform some uml diagrams (of singleton , AbstractFactory ...) to Z specification , first i transformed my uml diagram to an xml file using starUML then i used an xsl program and saxon to transform my xml file to .tex( for Z ) , but it didnt work . if someone has an idea about how the xsl program should be written (just maybe the steps) that will be great. thanks

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  • what idea is behind Zend Framework Frontcontroller/dispatcher

    - by simple
    Zend Framework FrontController implements Singleton and plus it has some kind a plugin "paradigm" , - what is the idea behind its architecture , maybe it implements some well known paradigm ? and if so then if u could give some links directions where I can find information about reasons that brought up that particular paradigm ?

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  • Problem with memory leaks

    - by user191723
    Sorry, having difficulty formattin code to appear correct here??? I am trying to understand the readings I get from running instruments on my app which are telling me I am leaking memory. There are a number, quite a few in fact, that get reported from inside the Foundation, AVFoundation CoreGraphics etc that I assume I have no control over and so should ignore such as: Malloc 32 bytes: 96 bytes, AVFoundation, prepareToRecordQueue or Malloc 128 bytes: 128 bytes, CoreGraphics, open_handle_to_dylib_path Am I correct in assuming these are something the system will resolve? But then there are leaks that are reported that I believe I am responsible for, such as: This call reports against this line leaks 2.31KB [self createAVAudioRecorder:frameAudioFile]; Immediately followed by this: -(NSError*) createAVAudioRecorder: (NSString *)fileName { // flush recorder to start afresh [audioRecorder release]; audioRecorder = nil; // delete existing file to ensure we have clean start [self deleteFile: fileName]; VariableStore *singleton = [VariableStore sharedInstance]; // get full path to target file to create NSString *destinationString = [singleton.docsPath stringByAppendingPathComponent: fileName]; NSURL *destinationURL = [NSURL fileURLWithPath: destinationString]; // configure the recording settings NSMutableDictionary *recordSettings = [[NSMutableDictionary alloc] initWithCapacity:6]; //****** LEAKING 384 BYTES [recordSettings setObject:[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey: AVFormatIDKey]; //***** LEAKING 32 BYTES float sampleRate = 44100.0; [recordSettings setObject:[NSNumber numberWithFloat: sampleRate] forKey: AVSampleRateKey]; //***** LEAKING 48 BYTES [recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey]; int bitDepth = 16; [recordSettings setObject: [NSNumber numberWithInt:bitDepth] forKey:AVLinearPCMBitDepthKey]; //***** LEAKING 48 BYTES [recordSettings setObject:[NSNumber numberWithBool:YES] forKey:AVLinearPCMIsBigEndianKey]; [recordSettings setObject:[NSNumber numberWithBool: NO]forKey:AVLinearPCMIsFloatKey]; NSError *recorderSetupError = nil; // create the new recorder with target file audioRecorder = [[AVAudioRecorder alloc] initWithURL: destinationURL settings: recordSettings error: &recorderSetupError]; //***** LEAKING 1.31KB [recordSettings release]; recordSettings = nil; // check for erros if (recorderSetupError) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Can't record" message: [recorderSetupError localizedDescription] delegate: nil cancelButtonTitle: @"OK" otherButtonTitles: nil]; [alert show]; [alert release]; alert = nil; return recorderSetupError; } [audioRecorder prepareToRecord]; //***** LEAKING 512 BYTES audioRecorder.delegate = self; return recorderSetupError; } I do not understand why there is a leak as I release audioRecorder at the start and set to nil and I release recordSettings and set to nil? Can anyone enlighten me please? Thanks

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  • scripts on Cshell

    - by lego69
    hello, I've got some problem, I have list of data in the file: 053-37878 03828008 Moskovitch James 500 052-34363 01234567 Mendelson Kippi 450 053-32322 03828008 Jameson Shula 350 054-39238 03333333 Merden Moshe 300 is it possible rewrite this list in the same file (without using temporary file) but without last number thanks in advance for any help (I'm talking about C-Shell scripts)

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  • How does WAS/IIS manage ServiceHost instances?

    - by foosnazzy
    It appears that WAS will call ServiceHostFactory.CreateHost() once per each service implementation. How does WAS manage the lifetime of the ServiceHost/ServiceHostFactory? We have a custom factory/host that is occasionally being re-initialized. I'm wondering if WAS is recycling itself or it has some other reason to re-create the ServiceHostFactory/ServiceHost. I'm guessing the ServiceHostFactory gets fired up for the AppDomain and is a singleton, can someone confirm?

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  • Entity Framework ObjectContext re-usage

    - by verror
    I'm learning EF now and have a question regarding the ObjectContext: Should I create instance of ObjectContext for every query (function) when I access the database? Or it's better to create it once (singleton) and reuse it? Before EF I was using enterprise library data access block and created instance of dataacess for DataAccess function...

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  • Create multiple modal windows with javascript (+jQuery), what is the best practice to indentify wind

    - by Kirzilla
    Hello, When creating every instance of Window object I should bind close button of each window to closing this window. But how should I identify windows? Should I create unique id for each Window instance or maybe another way? What is the best way to create such identifiers, maybe some kind of singleton object with id parameter which should be incremented each time when window is created? Thank you.

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  • Singletons in Cocoa Plugins

    - by David Beck
    How would I get a hold of a singleton in the main application from a SIMBL plugin? When I try to call something like [ProcessControl sharedInstance], I get an error that ProcessControl is undefined (even though it is declared in a header file).

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  • When should I use Dependency Injection and when utility methods?

    - by Roman
    I have a Java EE project with Spring IoC container. I've just found in Utils class static method sendMail(long list of params). I don't know why but I feel that it would look better if we had separate class (Spring bean with singleton scope) which will be responsible for sending email. But I can't find any arguments which can prove my position. So, are there any pros (or cons) in using DI in this (rather general) situation?

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  • initWithCoder works, but init seems to be overwriting my objects properties?

    - by Zigrivers
    Hi guys, I've been trying to teach myself how to use the Archiving/Unarchiving methods of NSCoder, but I'm stumped. I have a Singleton class that I have defined with 8 NSInteger properties. I am trying to save this object to disk and then load from disk as needed. I've got the save part down and I have the load part down as well (according to NSLogs), but after my "initWithCoder:" method loads the object's properties appropriately, the "init" method runs and resets my object's properties back to zero. I'm probably missing something basic here, but would appreciate any help! My class methods for the Singleton class: + (Actor *)shareActorState { static Actor *actorState; @synchronized(self) { if (!actorState) { actorState = [[Actor alloc] init]; } } return actorState; } -(id)init { if (self = [super init]) { NSLog(@"New Init for Actor started...\nStrength: %d", self.strength); } return self; } -(id)initWithCoder:(NSCoder *)coder { if (self = [super init]) { strength = [coder decodeIntegerForKey:@"strength"]; dexterity = [coder decodeIntegerForKey:@"dexterity"]; stamina = [coder decodeIntegerForKey:@"stamina"]; will = [coder decodeIntegerForKey:@"will"]; intelligence = [coder decodeIntegerForKey:@"intelligence"]; agility = [coder decodeIntegerForKey:@"agility"]; aura = [coder decodeIntegerForKey:@"aura"]; eyesight = [coder decodeIntegerForKey:@"eyesight"]; NSLog(@"InitWithCoder executed....\nStrength: %d\nDexterity: %d", self.strength, self.dexterity); [self retain]; } return self; } -(void) encodeWithCoder:(NSCoder *)encoder { [encoder encodeInteger:strength forKey:@"strength"]; [encoder encodeInteger:dexterity forKey:@"dexterity"]; [encoder encodeInteger:stamina forKey:@"stamina"]; [encoder encodeInteger:will forKey:@"will"]; [encoder encodeInteger:intelligence forKey:@"intelligence"]; [encoder encodeInteger:agility forKey:@"agility"]; [encoder encodeInteger:aura forKey:@"aura"]; [encoder encodeInteger:eyesight forKey:@"eyesight"]; NSLog(@"encodeWithCoder executed...."); } -(void)dealloc { //My dealloc stuff goes here [super dealloc]; } I'm a noob when it comes to this stuff and have been trying to teach myself for the last month, so forgive anything obvious. Thanks for the help!

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  • What's a good 2nd level cache for JEE applications?

    - by Hank
    Can anyone recommend a good 2nd level object caching solution for JEE 6 applications, and give background to your recommendation? I'm using JPA 2.0 as persistence provider. I am particularly worried about having to run the cache client as a single-thread / singleton bean. Is that the case? If so, is that an issue? I've good experience using memcached from a PHP webapp, but PHP is of course single-threaded, so that was never an issue...

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