Hi,
Several places have several methods. However I like the way of having an
inner static class. Java make sure a class is load only once, thus only one
object is created.
1. class Singleton {
2. private static class InstanceHolder {
3. public static Singleton instance = new Singleton();
4. }
5.
6. public static Singleton getInstance() {
7. return InstanceHolder.instance;
8. }
9. }
On Fri, Dec 19, 2014 at 3:19 PM, Manuranga Perera <[email protected]> wrote:
>
>
> ---------- Forwarded message ----------
> From: Manuranga Perera <[email protected]>
> Date: Fri, Dec 19, 2014 at 3:15 PM
> Subject: What is the recommended way to initialize singleton
> To: dev <[email protected]>
> Cc: Afkham Azeez <[email protected]>, Sameera Jayasoma <[email protected]>,
> Sameera Perera <[email protected]>, Ruchira Wageesha <[email protected]>
>
> Following kind of double locking code doesn't work [1] for singletons.
> (please remove this if you see it in any place in the platform)
>
> if(instance == null) {
> synchronized(MyClass.class) {
> if(instance == null) {
> instance = new MyClass();
> }
> }
> }
> return instance;
>
>
> There are multiple ways we can do this right. What is the best practice
> for defining singletons in unavoidable situations?
>
> [1] http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html
>
> --
> With regards,
> *Manu*ranga Perera.
>
> phone : 071 7 70 20 50
> mail : [email protected]
>
>
> --
> With regards,
> *Manu*ranga Perera.
>
> phone : 071 7 70 20 50
> mail : [email protected]
>
> --
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--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897
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