Hi Chaung,
What is this file-lock ? How do we lock a file ? Could you be a bit
clear on that?
Thanks in advance.
regards,
kris
-----Original Message-----
From: Gene Chuang [mailto:[EMAIL PROTECTED]]
Sent: Thursday, May 23, 2002 2:15 AM
To: [EMAIL PROTECTED]
Subject: Re: Off Topic : ClassLoaders
Please clarify: do you want an Instance singleton or a Class singleton
across multiple
VM's? These are two very distinct concepts.
An Instance singleton across multiple VMs is accomplishable in one of many
ways, as
already described by previous posts.
A Class singleton across multiple VMs isn't difficult either; simple
overload the
classloading method to
1) check for a file lock
2) load class if no lock, or throw ClassNotFoundException if lock exists
3) place file lock if Class successfully loaded
Gene
--- Ramakrishna N <[EMAIL PROTECTED]> wrote:
> Hi,
> This is an off topic suggestion that I am seeking but its urgent and so
I
> am posting it here.
> I want only one Instance of a particular Class to be running across
> multiple VMs. I mean if I am executing a class in one of the VMs then If I
> say run the same Class in another VM of the same machine it should not
run.
> How do I achieve this behaviour ?
> Currently we have a configuration xml file where in the Application
> registers when it has opened and registers again when it has successfully
> closed so that in between if I try to open the application in another VM
the
> application first reads the configuration xml and understands that one
> istance of the application is running and so it exits.
> I would like to achieve it through ClassLoaders. Say custom
> ClassLoaders. I am sure there should be a way to achieve this without
doing
> any I/O operations like opening a socket when the application starts..
> Any help on this would be of great help. Thanks in advance.
>
> Thanks & Regards,
> kris
>
>
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