Re: [equinox-dev] How do I dynamically install and attach a fragment?

[Thomas Watson <tjwatson@xxxxxxxxxx>]

Hi,

Simon is correct, you need to use either
PackageAdmin.resolveBundles(...) or PackageAdmin.refreshPackages(...) to
force a fragment to resolve.  When launching from PDE, the update
configurator bundle uses PackageAdmin to force all possible bundles to
resolve.  When you install a bundle yourself you must do something
to force it to resolve.  For fragment bundles the only way to force
them to resolve is to use PackageAdmin.

The two PackageAdmin methods (resolveBundles(...)
and refreshPackages(...)) have different usecases.

-  If you have a fragment which
you would like to resolve and attach to an existing host bundle which is
already resolved then you must use PackageAdmin.resolveBundles(...).  This
method will attempt to attach a fragment to any available host bundles.
 If the host bundle is already in the RESOLVED state then a fragment
can only be attached dynamically if it does not add any new constraints
to the host.

-  If you have a fragment which
adds new constraints (i.e. new Import-Package or Require-Bundle headers),
then you must use PackageAdmin.refreshPackages to force the host bundle
to re-resolve.  This is because we cannot dynamically add new constraints
to an already RESOLVED host bundle from fragment bundles.

Tom

"Simon Kaegi" <simon.kaegi@xxxxxxxxx>
Sent by: equinox-dev-bounces@xxxxxxxxxxx

12/29/2006 11:58 AM

Please respond to
Equinox development mailing list <equinox-dev@xxxxxxxxxxx>

To	"Equinox development mailing list" <equinox-dev@xxxxxxxxxxx>
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Subject	Re: [equinox-dev] How do I dynamically install and attach a fragment?

Hi Matthew,
 
What you're doing sounds right to me.
Is the fragment showing up as UNRESOLVED
in the console?
If you installed the fragment first, you
might need to use PackageAdmin.resolveBundles(...) and possibly refreshPackages(...)
to get everything set correctly.
 
-Simon
----- Original Message ----- 
From: Matthew
Webster 
To: Equinox
development mailing list 
Sent: Friday, December 29, 2006 6:32 AM
Subject: [equinox-dev] How do I dynamically install
and attach a fragment?


I am trying to use BundleContext.installBundle() to install a fragment
and its host. However when I use Bundle.loadClass() (for the host) I cannot
resolve any classes in the fragment. If use PDE (JUnit Plug-in Test) it
works. I notice that in the failing case querying the fragments gives no
host and vice versa for the host. Is there an additional API I must call
to attach the fragment? Is the order in which I install the bundles important?

Thanks in advance. 

Matthew Webster
AOSD Project
Java Technology Centre, MP146
IBM Hursley Park, Winchester,  SO21 2JN, England
Telephone: +44 196 2816139 (external) 246139 (internal) 
Email: Matthew Webster/UK/IBM @ IBMGB, matthew_webster@xxxxxxxxxx
http://w3.hursley.ibm.com/~websterm/

---

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