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  • Where does this concept of "favor composition over inheritance" come from?

    - by Mason Wheeler
    In the last few months, the mantra "favor composition over inheritance" seems to have sprung up out of nowhere and become almost some sort of meme within the programming community. And every time I see it, I'm a little bit mystified. It's like someone said "favor drills over hammers." In my experience, composition and inheritance are two different tools with different use cases, and treating them as if they were interchangeable and one was inherently superior to the other makes no sense. Also, I never see a real explanation for why inheritance is bad and composition is good, which just makes me more suspicious. Is it supposed to just be accepted on faith? Liskov substitution and polymorphism have well-known, clear-cut benefits, and IMO comprise the entire point of using object-oriented programming, and no one ever explains why they should be discarded in favor of composition. Does anyone know where this concept comes from, and what the rationale behind it is?

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  • Web Service - SOAP

    - by seth
    My experience with web services is slim and I'm trying to understand this a little bit more. I have done for instance a web service using visual studio. In order to use it, I add a web service reference in my projects and this creates a proxy and the use is pretty simple. Does this use SOAP? I ask this because i will be now facing a web service that i must communicate using SOAP with attachements and i'm trying to understand the concept behind this and the difference to what i have done so far. Will the proxy still be viable or do i need to create the XML by hand and post it to the web service? This concepts still confuse and so any help is appreciated. EDIT: I'm not developing the service, i will be just using it.

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  • Versioning Strategy for Service Interfaces JAR

    - by Colin Morelli
    I'm building a service oriented architecture composed (mostly) of Java-based services, each of which is a Maven project (in an individual repository) with two submodules: common, and server. The common module contains the service's interfaces that clients can include in their project to make service calls. The server submodule contains the code that actually powers the service. I'm now trying to figure out an appropriate versioning strategy for the interfaces, such that each interface change results in a new common jar, but changes to the server (so long as they don't impact the contract of the interfaces) receive the same common jar. I know this is pretty simple to do manually (simply increment the server version and don't touch the common one), but this project will be built and deployed by a CI server, and I'd like to come up with a strategy for automatically versioning these. The only thing I have been able to come up with so far is to have the CI server md5 the service interfaces.

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  • Fundamental programming book [closed]

    - by Luke Annison
    I'm a fairly new programmer and currently learning ruby on rails with the intention of developing a web application. I am currently going reading Agile Web Development with Rails 4th Edition and its working well for me, however I'm wondering if somebody can recommend a more general, almost classic book to read casually alongside to help cement the fundamentals in place. As I said, I'm for the most part a beginner and the only education I've had is this and briefly one other technical book, so I'm sure there must be some "must reads" out there that give me a more substantial context for the basics of either Ruby on Rails, Ruby, objective oriented programming, or programming in general. What books helped you grasp a deeper and more rounded understanding of your skills as a programmer? All suggestions are welcome and appreciated.

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  • Multiple Object Instantiation

    - by Ricky Baby
    I am trying to get my head around object oriented programming as it pertains to web development (more specifically PHP). I understand inheritance and abstraction etc, and know all the "buzz-words" like encapsulation and single purpose and why I should be doing all this. But my knowledge is falling short with actually creating objects that relate to the data I have in my database, creating a single object that a representative of a single entity makes sense, but what are the best practises when creating 100, 1,000 or 10,000 objects of the same type. for instance, when trying to display a list of the items, ideally I would like to be consistent with the objects I use, but where exactly should I run the query/get the data to populate the object(s) as running 10,000 queries seems wasteful. As an example, say I have a database of cats, and I want a list of all black cats, do I need to set up a FactoryObject which grabs the data needed for each cat from my database, then passes that data into each individual CatObject and returns the results in a array/object - or should I pass each CatObject it's identifier and let it populate itself in a separate query.

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  • Books or help on OO Analysis

    - by Pat
    I have this course where we learn about the domain model, use cases, contracts and eventually leap into class diagrams and sequence diagrams to define good software classes. I just had an exam and I got trashed, but part of the reason is we barely have any practical material, I spent at least two good months without drawing a single class diagram by myself from a case study. I'm not here to blame the system or the class I'm in, I'm just wondering if people have some exercise-style books that either provide domain models with glossaries, system sequence diagrams and ask you to use GRASP to make software classes? I could really use some alone-time practicing going from analysis to conception of software entities. I'm almost done with Larman's book called "Applying UML and Patterns An Introduction to Object-Oriented Analysis and Design and Iterative Development, Third Edition". It's a good book, but I'm not doing anything by myself since it doesn't come with exercises. Thanks.

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  • BizTalk 2009 - Service Instances: Last 100

    - by StuartBrierley
    Having previously talked about the lack of the traditional HAT in BizTalk 2009, the question then becomes how do you replicate some of the functionality that was previsouly relied on? I have already covered the Last 100 Messages Received, the Last 100 Messages Sent, and the Last 50 Suspended Messages queries so what about service instances? The BizTalk 2009 Group Hub allows you to search for suspended service instances and also running service instances, but not the two together. In BizTalk 2004 we had a query in HAT to return the last 100 service instances.  Lets create a direct replacement in the BizTalk 2009 Hatless environment. Basically we are creating a query to search for the last one hundred tracked service instances:

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  • How to make the transition to functional programming?

    - by tahatmat
    Lately, I have been very intrigued with F# which I have been working a bit with. Coming mostly from Java and C#, I like how concise and easily understandable it is. However, I believe that my background with these imperative languages disturb my way of thinking when programming in F#. I found a comparison of the imperative and functional approach, and I surely do recognize the "imperative way" of programming, but I also find it difficult to define problems to fit well with the functional approach. So my question is: How do I best make the transition from object-oriented programming to functional programming? Can you provide some tips or perhaps provide some literature that can help one to think "in functions" in general?

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  • Why are most GNU's software written in C

    - by BallroomProgrammer
    I am a Java developer, and I rarely write GUI program in C. However, I noticed that many GNU's projects, such as PSPP, R, Dia, etc., are written in C, instead of Java or C++. I personally don't mind this, but I am really curious why GNU favors C so much. My understanding is that C is the one that supports the least in object-oriented programming, and today's CS education really emphasizes OOP, as OOP really makes codes more reusable. In this case, why would so many developers choose to develop in C instead of C++ or Java. Does anyone know why GNU's software are so exclusively written in C? Do you think or GNU's software should be written in C++ or Java so that the source code could be more useful to people? Why or why not?

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  • Getting My Head Around Immutability

    - by Michael Mangold
    I'm new to object-oriented programming, and one concept that has been taking me a while to grasp is immutability. I think the light bulb went off last night but I want to verify: When I come across statements that an immutable object cannot be changed, I'm puzzled because I can, for instance, do the following: NSString *myName = @"Bob"; myName = @"Mike"; There, I just changed myName, of immutable type NSString. My problem is that the word, "object" can refer to the physical object in memory, or the abstraction, "myName." The former definition applies to the concept of immutability. As for the variable, a more clear (to me) definition of immutability is that the value of an immutable object can only be changed by also changing its location in memory, i.e. its reference (also known as its pointer). Is this correct, or am I still lost in the woods?

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  • Create an Asynchronous JAX-WS Web Service and call it from Oracle BPEL 11g

    - by Bob Webster
    This posting is the result of a simple requirement to take an existing JAX-WS Web service,convert it to be asynchronous and call it from Oracle BPEL 11g It turned out that this is not a trivial task... BPEL has some very specific expectations about the WSDL for an asynchronous process. One approach is to develop the service starting from a WSDL document that meets BPEL's requirements. This is possible but requires considerable WSDL authoring skills. The other approach is to modify the WSDL generated by Web Service Annotations in Java code (Bottom up development) and instruct JAX-WS to use that WSDL instead of dynamically generating one from annotations. This is the approach taken in this article. This posting details how to: Modify a JAX-WS Web Service developed using a "Bottom up " approach to have an asynchronous method and callback. Call the Asynchronous Service from Oracle BPEL 11g. Read the full posting here.

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  • Security settings for this service require 'Basic' Authentication

    - by Jake Rutherford
    Had an issue calling WCF service today. The following exception was being thrown when service was called:WebHost failed to process a request. Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/35320229 Exception: System.ServiceModel.ServiceActivationException: The service '/InteliChartVendorCommunication/VendorService.svc' cannot be activated due to an exception during compilation.  The exception message is: Security settings for this service require 'Basic' Authentication but it is not enabled for the IIS application that hosts this service..Ensured Basic authentication was indeed enabled in IIS before getting stumped on what actual issue could be. Turns out it was CustomErrors setting. Value was set to "off" vs "Off". Would have expected different exception from .NET (i.e. web.config parse exception) but it works now either way.

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  • Is OOP becoming easier or harder?

    - by tunmise fasipe
    When the concepts of Object Oriented Programming were introduced to programmers years back it looks interesting and programming was cleaner. OOP was like this Stock stock = new Stock(); stock.addItem(item); stock.removeItem(item); That was easier to understand with self-descriptive name. But now OOP, with pattern like Data Transfer Objects (or Value Objects), Repository, Dependency Injection etc, has become more complex. To achieve the above you may have to create several classes (e.g. abstract, factory, DAO etc) and Implement several interfaces Note: I am not against best practices that makes Collaboration, Testing and Integration easier

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  • Progressbar patterns (Eclipse)

    - by JesperE
    I've struggled quite a bit with Eclipse and progress-monitors to try to have good progressbars which report useful progress information to the user. Inevitably the code gets cluttered with lots of things like if (monitor.isCancelled()) return; ... lengthyMethodCall(monitor.newChild(10)); and all over the place I need to pass a IProgressMonitor as an argument to my methods. This is bad, for several reasons: The code gets cluttered with lots of code which is not relevant to what the function actually does. I need to manually guesstimate which parts of the code takes time, and which parts do not. It interacts badly with automated tests; where much of the information which goes into a progressbar instead should be logged for later inspection. Is there a way out of this? Are there tools which can help me out with one or more of these problems? Should I be looking at Aspect-Oriented Programming tools, or are there other alternatives?

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  • What makes C so popular in the age of OOP?

    - by GradGuy
    I code a lot both in C and C++ but did not expect C to be the second popular language, slightly behind Java! http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html I'm curious as why, in this age of OOP, C is still all that popular? Note that 4 out of top 5 popular languages are all "modern" object-oriented capable languages. Now I agree that you can do OOP in C to some extend, but that's sort of painful and not quite elegant! (well at least compared to C++ I guess) So what makes C this popular? efficiency? being low-level? or the vast majority of libraries that already exist? ... or something else?

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  • Is there an imperative language with a Haskell-like type system?

    - by Graham Kaemmer
    I've tried to learn Haskell a few times over the last few years, and, maybe because I know mainly scripting languages, the functional-ness of it has always bothered me (monads seem like a huge mess for doing lots of I/O). However, I think it's type system is perfect. Reading through a guide to Haskell's types and typeclasses (like this), I don't really see a reason why they would require a functional language, and furthermore, they seem like they would be perfect for an industry-grade object-oriented language (like Java). This all begs the question: has anyone ever taken Haskell's typing system and made a imperative, OOP language with it? If so, I want to use it.

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  • How to deal with OOP design problems in interviews?

    - by haps10
    This is a question where I seek guidance from fellow/senior developers to get into my dream company - it's a pioneer in OOP and Agile. I've already failed once to clear an interview. One part I feel most challenging is to come up with a proper Object Oriented design(classes, interfaces, methods, interactions etc.) in a very short time for certain situations like Pacman, Game Of Life and so on. As the problems are unprecedented ones - my approach is mostly to try different things and then make decisions - which they feel is not clear and not what they expect from a developer with 5+ years of experience. I've already studied a few books on patterns, OOP - it didn't help me much and I think it'll take a bit more than that. Could some one please guide on what specifically shall I practice so that I can do better at design problems as above. I want to refine my approach and have a better thought process.

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  • Consuming OData based Rest service in C# [en-US]

    - by ruimachado
    Nowadays comunication between applications is an active topic with daily usage and a large amount of pratical appliances. While developing an app in witch I had to consume an OData I found out that combining Linq with my code made this operation pretty easy.The algorithm to consume OData starts with adding a service reference to Visual Studio:After adding the service reference in wich you define the uri to the service, we start building our code.In your code the algorithm is the following:Define the Uri to your OData ServiceDefine the context of your odata, wich contains all entities exposed by the service.Query the context using LinqPrint the resultEasy and simple.Example code:01public static void Main(string[] args){02 03        Uri serviceUri= newUri("http://example.host.odataservice.net/service.svc", UriKind.Absolute);04        ODataService.ServiceEntities context = newODataService.ServiceEntities (serviceUri);05 06        context.Credentials = newSystem.Net.NetworkCredential(Username,Password);07 08         var query = from ServiceObject in context.YourEntity09                     select ServiceObject ;10 11        foreach (var myObject in query)12        {13            Console.WriteLine("\n Field1: {0} | Field2: {1}",14            myObject .Field1, myObject .Field2);15 16        }17}That’s it.Thank you,Rui Machadorpmachado.wordpress.com

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  • Why Deliver Customer Service in the Cloud?

    - by Charles Knapp
    In volatile, competitive markets, delivering exceptional service across channels is essential. But delivering world-class service on tight budgets, and deliving improvements quickly, is a tough challenge. That's why so many of the world's most successful organizations choose to deliver customer service in the cloud. Example: Michele Watson, VP of Global Customer Care at Match.com, says Oracle's service in the cloud "helps our customer receive the support they need in real time, our contact center agents be more productive and helpful, and our executive and product development teams receive detailed feedback to continue our improve our customers' experience." Learn more here about why you should consider delivering customer service in the cloud. 

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  • Service with intents not working. Help needed

    - by tristan202
    I need help in making my click intents work. I used to have them in my appwidgetprovider, but decided to move them into a service, but I am having trouble getting it to work. Below is the entire code from my intentservice: public class IntentService extends Service { static final String ACTION_UPDATE = "android.tristan.widget.digiclock.action.UPDATE_2"; private final static IntentFilter sIntentFilter; public int layoutID = R.layout.clock; int appWidgetIds = 0; static { sIntentFilter = new IntentFilter(); } @Override public IBinder onBind(Intent intent) { return null; } @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); } @Override public void onCreate() { super.onCreate(); registerReceiver(onClickTop, sIntentFilter); registerReceiver(onClickBottom, sIntentFilter); Log.d("DigiClock IntentService", "IntentService Started."); } @Override public void onDestroy() { super.onDestroy(); unregisterReceiver(onClickTop); unregisterReceiver(onClickBottom); } private final BroadcastReceiver onClickTop = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if(intent.getAction().equals("android.tristan.widget.digiclock.CLICK")) { PackageManager packageManager = context.getPackageManager(); Intent alarmClockIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER); String clockImpls[][] = { {"HTC Alarm Clock", "com.htc.android.worldclock", "com.htc.android.worldclock.WorldClockTabControl" }, {"Standar Alarm Clock", "com.android.deskclock", "com.android.deskclock.AlarmClock"}, {"Froyo Nexus Alarm Clock", "com.google.android.deskclock", "com.android.deskclock.DeskClock"}, {"Moto Blur Alarm Clock", "com.motorola.blur.alarmclock", "com.motorola.blur.alarmclock.AlarmClock"} }; boolean foundClockImpl = false; for(int i=0; i<clockImpls.length; i++) { String vendor = clockImpls[i][0]; String packageName = clockImpls[i][1]; String className = clockImpls[i][2]; try { ComponentName cn = new ComponentName(packageName, className); ActivityInfo aInfo = packageManager.getActivityInfo(cn, PackageManager.GET_META_DATA); alarmClockIntent.setComponent(cn); foundClockImpl = true; } catch (NameNotFoundException e) { Log.d("Error, ", vendor + " does not exist"); } } if (foundClockImpl) { Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE); vibrator.vibrate(50); final RemoteViews views = new RemoteViews(context.getPackageName(), layoutID); views.setOnClickPendingIntent(R.id.TopRow, PendingIntent.getActivity(context, 0, new Intent(context, DigiClock.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK), PendingIntent.FLAG_UPDATE_CURRENT)); AppWidgetManager.getInstance(context).updateAppWidget(intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS), views); alarmClockIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(alarmClockIntent); } } } }; private final BroadcastReceiver onClickBottom = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if(intent.getAction().equals("android.tristan.widget.digiclock.CLICK_2")) { PackageManager calendarManager = context.getPackageManager(); Intent calendarIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER); String calendarImpls[][] = { {"HTC Calendar", "com.htc.calendar", "com.htc.calendar.LaunchActivity" }, {"Standard Calendar", "com.android.calendar", "com.android.calendar.LaunchActivity"}, {"Moto Blur Calendar", "com.motorola.blur.calendar", "com.motorola.blur.calendar.LaunchActivity"} }; boolean foundCalendarImpl = false; for(int i=0; i<calendarImpls.length; i++) { String vendor = calendarImpls[i][0]; String packageName = calendarImpls[i][1]; String className = calendarImpls[i][2]; try { ComponentName cn = new ComponentName(packageName, className); ActivityInfo aInfo = calendarManager.getActivityInfo(cn, PackageManager.GET_META_DATA); calendarIntent.setComponent(cn); foundCalendarImpl = true; } catch (NameNotFoundException e) { Log.d("Error, ", vendor + " does not exist"); } } if (foundCalendarImpl) { Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE); vibrator.vibrate(50); final RemoteViews views2 = new RemoteViews(context.getPackageName(), layoutID); views2.setOnClickPendingIntent(R.id.BottomRow, PendingIntent.getActivity(context, 0, new Intent(context, DigiClock.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK), PendingIntent.FLAG_UPDATE_CURRENT)); AppWidgetManager.getInstance(context).updateAppWidget(intent.getIntArrayExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS), views2); calendarIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(calendarIntent); } } }; }; ;}; What am I doing wrong here?

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  • What is this service called in English?

    - by moomoochoo
    DETAILS I'm not familiar with server administration and am trying to find the name of a particular service offered by a Japanese website provider. The service is for a dedicated server. I have attached a picture detailing the service below. The left side of the picture shows the server without the service. The right side shows the server with the service. Once I know the name of the service I will Google it, but any additional information in regards to the pros and cons of such a service would be much appreciated. Thanks! QUESTION What is the name of the service in the picture. What are the pros and cons of this service?

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  • tab completion for service command on debian

    - by markus
    I have two systems with debian squeeze installed. On one system when I type: service <TAB> it shows me all available service (from /etc/init.d) on the other system it shows me all files from the current directory. Does anyone know which setting changes that behaviour ? UPDATE: The file /etc/bash_completion.d/service was missing. I copied it from the machine where it is working. If I type complete -p | grep service it shows me: complete -F _service service On the machine where it is not working that command shows me nothing. I executed complete -F _service service in the command line, after that, the command service <TAB> shows me: service -su: completion: function `_service' not found this function is defined in the service file I recently copied, for some reasons it can't be found ...

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  • Bluetooth -> service discovery failed

    - by Kaiser
    Hello, I'm writing an application which is able to communicate with my PC. I have used the Bluetooth functionalities of the SDK 2.1. I can find devices, get their MAC address, create a RFCOMM socket, but when I start the connection, I get the following error message : Service discovery failed. 1)Is it because of the UUID which is not the same on my application and on my PC ? 2)How can I get the correct UUID on my PC ? If I write a such application, is my Nexus one the client or the server ? Thanks a lot for your help !

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  • How to use WIX to deploy and run WCF service

    - by Giampaolo
    Hi I am trying to make an installer which deploys my wcf service, at the moment it is creating the virtual directory, but when i try connect my app to it, i get a CommunicationException was unhandled by user code The remote server returned an error: NotFound. I notice that if i create a virtual directory manually that it will connect and work, so i'm assuming IIS is doing something behind my back which is making it work. This is the code i am using to create the virtual directory,please note this is inside a iis:WebSite tag if more information is needed please let me know. <iis:WebVirtualDir Id="VAWebService" Directory="VAWebService" Alias="VAWebService" > <iis:WebApplication Id="VAWebService" Name="VAWebService" AllowSessions="yes" WebAppPool="VA_AppPool" /> <iis:WebDirProperties Id="MyWebSite_Properties" AnonymousAccess="yes" WindowsAuthentication="no" DefaultDocuments="service1.svc" AccessSSL="yes" AccessSSL128="yes" AccessSSLMapCert="yes" AccessSSLNegotiateCert="yes" AccessSSLRequireCert="yes" Read="yes" Write="yes" Execute="yes" Script="yes" /> </iis:WebVirtualDir> Does any one know how to fix this? any help would be appreciated. Thanks

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  • Consuming SAP Web Service from ASP.Net

    - by mehmet6parmak
    Hi, Next week i am supposed to develop an asp.net application which will connect to SAP, retrieve some data, change them and send back to SAP. We decided to use web services to achieve this and now i just want to know what diffuculties may i face with? I have URL of WSDL of the Web Service, will it be enough for me to adding web reference and giving the WSDL's URL? How will i authenticate? And Will it be the same with consuming normal web services? Also i wonder is there anybody that can share a .NET dll that can be used in visual studio 2008? There are some articles relating how to create such a dll using SAP .Net Connector and visual studio 2003 but i could not find anybody sharing the resulting dll under their post. Thanks...

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