[EMAIL PROTECTED] wrote:
Thanks Richard
It all depends on how isolated you want your instances to be, but one
approach is to modify your bundle to provide a factory for creating
instances of you app
Creating an instance is as easy as instanitating a class (which uses
many many other classes including singletons), but I do need the
instances to be isolated so that the singletons in one instance do not
interfere with or overwrite the singletons in another. Could that work
with your factory solution?
That depends on your implementation details. If your singletons are
static members of some class, probably not, e.g. :
public Foo {
private static Value v;
public static void init(Value v) {
this.v = v;
}
public static Value get() {
return v
}
}
This wouldn't work because everyone would be trying to set and access
the same class statics. However, if your singletons are instances stored
someplace, which is itself an instance, then no problem. This would be
similar to how the OSGi registry works, where a service instance is
created and placed into the service registry for bundles to discover.
If your singleton approach is based on static (generally not a good
idea), then you will need to use class loader isolation, which will
require separate bundles.
-> richard
p.s. Another approach is to create your own Felix launcher. Instead of
installing the same bundle multiple times into one framework instance,
you could create and start different framework instances, installing
your bundle once into each one. Then you don't need to make any
modifications to your bundle. However, they will not be running in the
same framework and won't be able to interact in any way. This would be
pretty easy to implement.
-----Original Message-----
From: Richard S. Hall [mailto:[EMAIL PROTECTED]
Sent: 18 November 2008 14:54
To: [email protected]
Subject: Re: Running multiple instances of one bundle?
It used to be that you could do this by just installing the bundle again
using a different location, but OSGi R4 added the additional requirement
that the symbolic name + version pair must be unique, so this is no
longer possible.
It all depends on how isolated you want your instances to be, but one
approach is to modify your bundle to provide a factory for creating
instances of you app, then you can creating as many instances as you
want.
A hacky approach is to create another copy of your bundle with a
different symbolic name and install two copies.
-> richard
[EMAIL PROTECTED] wrote:
Hi all
Is it possible to run multiple instances of one bundle simultaneously?
The idea here is to use OSGi as a way of running multiple instances,
in one JRE, of a very messy client application that uses lots of
singletons and so on. The multiple instances would be used to
load-test a server.
They would differ only in that they would each "log in" to the server
using a different userID, which could be passed in as a parameter or
fetched from a distinct OSGi service.
Thanks,
Anthony
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