CODEWITHSUNDEEP
javadesign-patterns
Vivek Panday
Vivek Panday

Reputation: 1436

Singleton on Two JVM

Is It Possible to achieve Singleton for any given class on two JVM Machine.? Here My requirement is to achieve Singleton on two JVM machine lets say code is deployed on two machines

Upvotes: 0

Views: 1453

Answers (3)

Mohit Singh
Mohit Singh

Reputation: 6167

No You cannot implement it. totally agree with Davide Lorenzo. if you try o do so you will have to either use reflection(a bad way though) or you will break the singleton property.

Upvotes: 0

hemant1900
hemant1900

Reputation: 1226

Typically no, but you can implement it in logical way using some kind of distributed caching. E.g. Distributed Ehcache (http://ehcache.org/documentation/2.6/get-started/about-distributed-cache)

Here you instantiate the singleton in one JVM and immediately put it in distributed cache which serializes it across all JVMs. So all JVMs have same copy of the singleton (now its no more singleton in theoretical way but logically it is the same object across all JVMs).

Upvotes: 2

Davide Lorenzo MARINO
Davide Lorenzo MARINO

Reputation: 26926

No. The singleton pattern is appliable only for a single JVM.

You can use other approaches (not singleton) to have a single object instance for a number of JVM greater than one. For that you need a central repository to store information on wich JVM is storing the single instance of your object. This could be a centralized database or a centralized file.

Upvotes: 5

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