equinox Region support
----------------------
Key: KARAF-1009
URL: https://issues.apache.org/jira/browse/KARAF-1009
Project: Karaf
Issue Type: Improvement
Components: karaf-core
Affects Versions: 3.0.0
Reporter: David Jencks
Assignee: David Jencks
Virgo and the subsystem RI (under development) use the equinox region jar for
isolation in R43 frameworks. Subsystem provides a convenient way to set up
some isolation containers but is much less general than the regions jar or
model allow for. It might be useful both before subsystems is available and to
provide the additional flexibility to integrate region based isolation in karaf.
the attached patch implements isolation and provides some minimal
administration commands. Set up the desired region model in
etc/regions-config.xml. The available commands are:
region:info shows the structure of the regions and which region each bundle is
in
region:addbundle moves a bundle from one region (probably the root) to the
specified region
region:addfilter creates a filter between regions. AFAICT once created a filter
cannot be modified.
region:addregion adds a region
the model in regions-config.xml is installed only on first startup: subsequent
modifications will have no effect without a clean start.
The "from" and "to" regions for a filter match the region api but seem
backwards to me: a filter from R1 to R2 lets the stuff allowed by the filter in
R2 be visible to R1.
To build, you need to build the /region module with -Pfetch-external to get the
region jar in your local maven repo.
Generally the practical way to install bundles into a region is to specify the
(new) "region" attribute on a feature. I've set up the jpa and jndi features
to install into the application region included as an example. Previously I've
modified the aries 0.4-SNAPSHOT util jar to include a recursive bundle tracker
that will let the blueprint extender find blueprint bundles in all regions no
matter how isolated so the jpa blueprint config should get created. If it
doesn't check that your aries util bundle is up to date.
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