My requirement is that I need only one single instance for
the whole application in clustered environment.
i.e. even if there are more than one JVMs , all of them
should access single instance.
Exact requirement is that we have a class that handles the
locking functionality of documents in our
Application. We create only one singleton object of this
class and this object maintains a map of locked documents.
Now, in clustered environment, there will be more than one
JVMs and hence more than one objects that are handling
The locking information, which is actually wrong.
I hope I am clear in my words.
Waiting for your reply.
Thanks and regards
Varun Rally
From: An interest list
for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@JAVA.SUN.COM] On
Behalf Of Tubman Aharon
Sent: Thursday, December 02, 2004
1:52 PM
To:
J2EEPATTERNS-INTEREST@JAVA.SUN.COM
Subject: Re: Singleton in
clustered environment
I agree with Mall. It is bad practice to access
singleton remotely. Can you describe the meter of you problem? Which kind of
service it provides?
From: An interest list
for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@JAVA.SUN.COM] On
Behalf Of Mall, Vishnu (Cognizant)
Sent: Thursday, December 02, 2004
8:08 AM
To:
J2EEPATTERNS-INTEREST@JAVA.SUN.COM
Subject: Re: Singleton in
clustered environment
The Concept of Singleton is "one
and only one instance of a class at any given point of time in a single
JVM". The moment you mention a clustered environment, you would end up
having multiple JVMs and hence each JVM would have an instance of this
Singleton class. Hope this helps. Do let me know your exact requirement in detail.
Thanks and Regards,
Vishnu Mall
Cognizant Technology Solutions,
Technocomplex, Kolkata
Ph : 2357 3211/12/13 Extn : 3253
email : MVishnu@cal.cognizant.com
-----Original Message-----
From: Varun Rally, Noida
[mailto:varunr@NOIDA.HCLTECH.COM]
Sent: Thursday, December 02, 2004
11:03 AM
To:
J2EEPATTERNS-INTEREST@JAVA.SUN.COM
Subject: Singleton in clustered
environment
Hi all,
I have to implement singleton in clustered environment.
Can somebody, help with some online resource/link or pattern
for doing the same.
Regards,
Varun Rally
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