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Re: [equinox-dev] Choosing which version of a bundle to start after the workbench starts

Thanks Peter and Tom.  You're right that I was confusing my terminology.  I'll try using a resolverHook. Perhaps using resolverHooks will be more stable than enabling and disabling bundles through PDE's BundleInfo class.

Are there any examples or tutorials on resolverHooks?  I've been looking through the equinox/eclipse code base and a bit of a web search, but haven't found anything useful yet.


On Thu, Apr 11, 2013 at 12:02 PM, Peter Kriens <peter.kriens@xxxxxxxxx> wrote:
As Thomas indicated, you're confusing wiring and start stop. The wiring is basically creating a class path for the bundles. Since the java VM is very picky there is no way you can do anything useful in java before a class can properly link to its context. Start and stop in OSGi is different. It tells a bundle to provide its function or not. When you use services this model makes a lot of sense.

So you're using in the wrong way. As with any technology it is a bad idea to go against its intended usage, however close it may seem. If I get your root requirement then I think the best solution is to create a "management" bundle. This bundle looks at your property and installs the proper bundle. This can be done quite easily with the OSGi api and saves some memory as well.

Unfortunately, in Eclipse you will then be confronted with the little problem of starting your management bundle ...

Kind regards,

    Peter Kriens 

Sent from my iPad

On 11 apr. 2013, at 20:54, Andrew Eisenberg <andrew@xxxxxxxxxxxx> wrote:

Right, so taking a deeper look, it seems that the version dependencies are all fixed early on in the framework's startup during the call to SystemState.resolve().  So, even if I call stop() later oniensfor the 2.0 bundle, it is already wired to other bundles (and will get restarted when a class of its is loaded).  So, it looks like calling stop and start in downstream bundles is happening too late. This brings me back to my original solution, which I want to avoid is to get into the framework early enough so that I have control over how the resolving happens.


On Thu, Apr 11, 2013 at 11:08 AM, Andrew Eisenberg <andrew@xxxxxxxxxxxx> wrote:
OK.  Just tried something like this.  The problem is that by the time the downstream bundle gets into its start method, and tries to stop all of the unwanted versions of the non-singleton bundle, a bunch of wiring has already been done.  And there are other bundles out there that have already wired themselves to the 2.0 version instead of the 1.8 version.  I'll dig a bit deeper to see if this is just a matter of timing (ie- maybe I'm choosing the wrong downstream bundle to execute stop() in).


On Thu, Apr 11, 2013 at 10:49 AM, Neil Bartlett <njbartlett@xxxxxxxxx> wrote:
Bundle version 2.0.0 will only be started if somebody explicitly starts it, or if it has already been put into the persistently-started state, or if it is listed in config.ini with @start.

If you're unsure of the current persisted state of all the bundles, your "starter" bundle should probably explicitly stop ALL versions before transiently starting the selected version.

Neil


On Thu, Apr 11, 2013 at 6:42 PM, Andrew Eisenberg <andrew@xxxxxxxxxxxx> wrote:
Thanks, Neil.  I'll have to try this to make sure, but starting the bundle that I want doesn't prevent the bundle I don't want from starting.  Eg- if I want version 1.8.6 and I call start(START_TRANSIENT) on it, I think the 2.0.0 version will still be started.

I'll try this to make sure, though.


On Thu, Apr 11, 2013 at 10:22 AM, Neil Bartlett <njbartlett@xxxxxxxxx> wrote:
Why not start the bundle transiently (ie. Bundle.START_TRANSIENT) from another ordinary bundle? Since the target bundle's start-state is not persisted, you will be able to decide each time which bundle to start.

Neil


On Thu, Apr 11, 2013 at 6:18 PM, Andrew Eisenberg <andrew@xxxxxxxxxxxx> wrote:
Hi all,

I have multiple versions of a bundle installed in my Eclipse installation.  After the workbench starts up, I need to make a decision as to which version of the bundle should be started based on a system property that the user passes in from the command line.  Currently, I am doing this through a framework adapter that adds a BundleInfo to disable/enable appropriate versions of the bundle as the workbench starts up, but this is brittle and has limitations.

This bundle is not a singleton and all downstream bundles depend on a version range that includes all possible candidates of this bundle.

So my question is: is there any way to control which version of the plugin starts without using BundleInfos?  I can provide more details if you need.

thanks for your help,
Andrew

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