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Singleton Dialog pattern


Singleton Dialog pattern

By : user2950299
Date : November 17 2020, 11:52 AM
To fix this issue Close() will dispose your dialog, preventing you from reusing it.
Call Hide() instead.
code :


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Should my Wait Dialog implement Singleton pattern?

Should my Wait Dialog implement Singleton pattern?


By : Alyona Chernishev
Date : March 29 2020, 07:55 AM
I wish this help you No, it's a bad idea. The Form class was very much designed as a single-use class. Once a form object is disposed it is dead and cannot be revived. You'll get an ObjectDisposedException when you try to display it again. To prevent this, you'll have to intercept the FormClosing event and stop the default processing. You could call Hide() and set e.Cancel = true. But now you've got the hassle of killing it when you really want to get rid of it.
But perhaps more convincingly, you should only ever cache objects that are very expensive to create but don't take a lot of resources. The Form class is the exact opposite. Creating it is cheap but it takes a very large amount of both managed and unmanaged resources. Especially the latter, a window is a very costly OS object. It may look like a Form is expensive to create but what you see is the cycles that are burned on painting the form. You'll burn the exact same number of cycles when you show a hidden form.
In what cases, a singleton design pattern may generate multiple instances of the same singleton class?

In what cases, a singleton design pattern may generate multiple instances of the same singleton class?


By : PiGeoN
Date : March 29 2020, 07:55 AM
it helps some times In C++11 there is a new facility to make once-only initialization reliable - std::call_once. You can find a good reference for it here. If you're working with a compiler that supports C++11, this gives you a nice platform-independent, standard way of accomplishing it.
At the platform dependent level, most operating systems provide a means of doing once-only initialization. E.g. in iOS or OS X you can use dispatch_once from Grand Central Dispatch. On Windows, there's a One-Time Initialization API available in Vista and later.
Android Modal Dialog implemented Singleton pattern

Android Modal Dialog implemented Singleton pattern


By : Milan Mićko Grabovac
Date : March 29 2020, 07:55 AM
wish of those help I think I cannot do what i want to do. this is based on how Android works.
dissabled the code below
code :
 synchronized( synchObject )
        {
           try
           {
              synchObject.wait();
           }
Using Java singleton pattern (static access to the singleton) with Spring

Using Java singleton pattern (static access to the singleton) with Spring


By : user3425479
Date : March 29 2020, 07:55 AM
Hope this helps Accessing a Spring bean from a static context is problematic because the initialization of beans isn't tied to their construction, and Spring may instrument injected beans by wrapping them in proxies; simply passing around references to this will often result in unexpected behaviour. It's best to rely on Spring's injection mechanism.
If you really have to do it (perhaps because you need access from legacy code), use something like this:
code :
@Service
public class A implements ApplicationContextAware {

    private static final AtomicReference<A> singleton;
    private static final CountDownLatch latch = new CountDownLatch(1);

    @Resource
    private MyInjectedBean myBean; // inject stuff...

    public static A getInstance() {
        try {
            if (latch.await(1, TimeUnit.MINUTES)) {
                return singleton.get();
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }
        throw new IllegalStateException("Application Context not initialized");
    }

    @Override
    public void setApplicationContext(ApplicationContext context) {
        singleton.set(context.getBean(A.class));
        latch.countDown();
    }
}
Does making singleton class sealed really help in achieving goal of singleton pattern C# - Static Initialization (A thre

Does making singleton class sealed really help in achieving goal of singleton pattern C# - Static Initialization (A thre


By : z statman
Date : March 29 2020, 07:55 AM
Hope this helps Simply put: if anyone can derive from it, there can be multiple instances. So you definitely need some way of preventing arbitrary derivation.
Now you can simply rely on a private constructor to prevent subclassing instead (and you need the private constructor anyway), but the only reason for making a Singleton class unsealed would be if you wanted a nested type to be the implementation, e.g.
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