Singleton object will create instances per jvm basis. How it works in clustering environment?
What are the alternatives?
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It would be useful to know what you are using to create your cluster. – Mike Daniels Sep 26 '11 at 22:33
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I used Apache Http webserver,Apache Tomcat server and mod_jk.dll – Raj Sep 26 '11 at 22:35
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I think the question is legitimate after the information about technologies used. – Bozho Sep 26 '11 at 22:46
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check this out: http://stackoverflow.com/questions/1194129/singleton-in-cluster-environment – shrini1000 May 23 '12 at 09:25
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Technically, you can use Terracotta to cluster the JVM. I think it will guarantee the singleton instance.
But I think it's not what you want. Singletons are just "global state". So you don't need the same instance as long as the state (field values) in it is the same. I don't know how you cluster your application, but I guess you can have cluster-wide data.
Bozho
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One alternative is to not create a Singleton:
http://code.google.com/p/google-singleton-detector/
Google thinks they're a bad idea.
Clustered caching sounds like what you want. Maybe a Terracotta or a Coherence is a better idea.
duffymo
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