Hi there.
Are you sure that you have a problem? Remember that Google App Engine is a
cloud, and that your app could be running on multiple independent individual
nodes. Each node could initialize one single instance of your singleton, as
expected.
Good luck,
Raj
On Apr 5, 2010, at 9:49 AM, g3 insight wrote:
> We are meeting one strange thing when we do testing on GAE.
> The problem is that we implemented a GameCenter class as below.
> It is a singleton class in system, but we found it always initialize
> multiple instances based on logs.
> Please check the source code and info log below.
> Could you explain why it happens and how to resolve it?
>
>
> Source Code:
> public class GameCenter implements IGameCenter {
> static final long serialVersionUID = -1L;
> private static GameCenter instance = null;
> private long instanceNumber = -1;
> private GameCenter() {
> instanceNumber = System.currentTimeMillis();
> initRoom();
> hostClientProxy = new HostClientProxyImpl();
> chatCenter = new ChatCenter(null);
> log.info("GameCenter constructor--- : " + instanceNumber);
> dataVersion = 0;
> }
> public static synchronized GameCenter getInstance() {
> if(instance == null){
> instance =new GameCenter();
> }
> return instance;
> }
> }
>
>
> Info Log in GAE:
> 04-05 07:29AM 47.910 GameCenter <init>: GameCenter constructor--- :
> 1270477784633
> 04-05 07:27AM 48.654 GameCenter <init>: GameCenter constructor--- :
> 1270477664172
>
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