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Decoupling singleton design pattern
I am trying to implement a decoupled singleton, I have read that this way will help my code be more flexible and avoid hard dependency on database when server might be down.
public class Singleton {
private static Singleton singletonInstance;
private Singleton() {
}
public static Singleton getSingletonInstance() {
if(singletonInstance==null){
singletonInstance = new Singleton();
}
return singletonInstance;
}
}
However, in some cases, I have to use the constructor to initialize some private fields (e.g. single instance of a customized product). I have also read that using constructor as method may create a possible multiple instances.
My question is when will the method getSingletonInstance() be executed and how can I make sure that it is only executed once?
Thanks.
A:
Singleton methods should be static for good reason:
There's no sense in hiding the only instance of a class by making it a private instance variable.
They're typically called from outside code.
If you want to ensure a single instance of the class is created, you should make the Singleton constructor private:
Singleton() {
//....
}
This will make the singleton class non-instantiable.
You can then still get the single instance using Singleton.getSingletonInstance().
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