Distributed OSGi has been edited by David Bosschaert (May 25, 2009).

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Apache CXF provides the Reference Implementation of the Distribution Software (DSW) component of the Distributed OSGi Specification (RFC 119 in http://www.osgi.org/download/osgi-4.2-early-draft3.pdf).
It implements RFC 119 using Web Services, leveraging SOAP over HTTP and exposing the Web Service over a WSDL contract.

An implementation of the RFC 119 Discovery service is also worked on in this project.

Looking for the developer reference? See the Distributed OSGi Reference pages.
Presentations and other documents are on the DOSGi Presentations page.

Getting Started

To get started, get yourself a CXF-DOSGi distribution.

The following distributions are available:

  • Multi Bundle Distribution: This distribution is a zip file containing the Distributed OSGi bundles, as well as all their dependencies.
  • Single Bundle Distribution: This is a convenience distribution of a single bundle that embeds all the dependencies.

Which distribution to take? That depends on what you are doing. The single-bundle distribution is a really convenient way of getting started as it provides all of Distributed OSGi plus its dependencies in one.
The multi-bundle distribution is obviously a little more work to install, but the fine-grained bundles do have an extra benefit: they allow sharing. So if your application depends on one or more of the library bundles, it can use them from the multi-bundle distribution. Similarly, the multi-bundle distribution makes it possible to update the dependency bundles - if compatible - without having to replace the Distributed OSGi bundles.

Get a distribution by:

  • Downloading a built distribution. See the DOSGi Releases page.
  • Alternatively, built the distribution yourself. See the DOSGi Build page.

The Samples

The samples directory contains the following sample projects:
greeter: a very simple demo of a Greeter OSGi Service exposed remotely and a Consumer invoking on it.
spring_dm: a demo created using Spring-DM. Rather than invoking on the OSGi API's directly, the Spring-DM demo shows how you can use Spring to configure your beans as OSGi Services and similarly how to use Spring-DM to invoke a (remote) OSGi Service.
ds: this demo shows how Distributed OSGi can be used with OSGi Declarative Services (DS).

Walkthrough of the Greeter Demo

An easy way to get started with the samples is by checking them out from SVN (http://svn.apache.org/repos/asf/cxf/dosgi/trunk/samples) and then building them yourself using mvn install.

Using it in your OSGi container

Configuration file snippets for Felix and Equinox are automatically generated during the build process. You can paste these snippets in the configuration of you OSGi container to automatically load the bundles for your distribution.

After doing a build, the following snippets are available:
distribution/multi-bundle/target/felix.config.properties.append
distribution/multi-bundle/target/equinox.config.ini.append
distribution/single-bundle/felix.config.properties.append
distribution/single-bundle/equinox.config.ini.append

Note that to run the Distributed OSGi bundles, you need an OSGi container that implements the ListenerHook Service Registry Hook. This is a new feature in OSGi 4.2 which is available in Felix from version 1.6.0 and Equinox 3.5 milestones since December 2008.

Using Felix

Verified with: Felix 1.8.0

  • Append the content of the felix.config.properties.append file to the conf/config.properties file that comes with Felix.
  • Then start Felix as normal.

For the single-bundle distribution, the following bundles will be present:

java -jar bin\felix.jar
... log output ommitted ...
-> ps
START LEVEL 2
   ID   State         Level  Name
[   0] [Active     ] [    0] System Bundle 
[   1] [Active     ] [    1] Apache Felix Shell Service 
[   2] [Active     ] [    1] Apache Felix Shell TUI 
[   3] [Active     ] [    1] Apache Felix Bundle Repository 
[   4] [Active     ] [    2] OSGi R4 Compendium Bundle (4.1.0)
[   5] [Active     ] [    2] Distributed OSGi Distribution Software Single-Bundle Distribution

For the multi-bundle distribution the list is obviously much longer:

START LEVEL 34
   ID   State         Level  Name
[   0] [Active     ] [    0] System Bundle (1.5.0.SNAPSHOT)
[   1] [Active     ] [    1] Apache Felix Shell Service (1.1.0.SNAPSHOT)
[   2] [Active     ] [    1] Apache Felix Shell TUI (1.1.0.SNAPSHOT)
[   3] [Active     ] [    1] Apache Felix Bundle Repository (1.3.0.SNAPSHOT)
[   4] [Active     ] [    2] OSGi R4 Compendium Bundle (4.1.0)
[   5] [Active     ] [    3] geronimo-annotation_1.0_spec (1.1.1)
[   6] [Active     ] [    4] geronimo-activation_1.1_spec (1.0.2)
[   7] [Active     ] [    5] geronimo-javamail_1.4_spec (1.2)
[   8] [Active     ] [    6] geronimo-ws-metadata_2.0_spec (1.1.2)
[   9] [Active     ] [    7] geronimo-servlet_2.5_spec (1.1.2)
[  10] [Active     ] [    8] Apache Commons Logging (1.1.1)
[  11] [Active     ] [    9] JDOM DOM Processor (1.0.0)
[  12] [Active     ] [   10] spring-core (2.5.5)
[  13] [Active     ] [   11] spring-beans (2.5.5)
[  14] [Active     ] [   12] spring-context (2.5.5)
[  15] [Active     ] [   13] AOP Appliance API (1.0.0)
[  16] [Active     ] [   14] spring-aop (2.5.5)
[  17] [Active     ] [   15] spring-osgi-io (1.1.2)
[  18] [Active     ] [   16] spring-osgi-core (1.1.2)
[  19] [Active     ] [   17] spring-osgi-extender (1.1.2)
[  20] [Active     ] [   18] Jetty Utilities (6.1.9)
[  21] [Active     ] [   19] Jetty Server (6.1.9)
[  22] [Active     ] [   20] org.apache.servicemix.specs.locator-1.0.0.jar
[  23] [Active     ] [   21] Apache ServiceMix OSGI Common Bundles: jaxb-impl (4.0.0.m1)
[  24] [Active     ] [   22] Apache ServiceMix OSGI Common Bundles: wsdl4j (4.0.0.m1)
[  25] [Active     ] [   23] Apache ServiceMix OSGI Common Bundles: xmlschema (4.0.0.m1)
[  26] [Active     ] [   24] Apache ServiceMix OSGI Common Bundles: asm-2.2.3 (1.0.0.rc1)
[  27] [Active     ] [   25] Apache ServiceMix OSGI Common Bundles: xmlresolver (4.0.0.m1)
[  28] [Active     ] [   26] Apache ServiceMix OSGI Common Bundles: neethi (4.0.0.m1)
[  29] [Active     ] [   27] Apache ServiceMix Bundles: woodstox-3.2.7 (3.2.7.1)
[  30] [Active     ] [   28] Apache CXF Minimal Bundle Jar (2.0.8)
[  31] [Active     ] [   29] CXF Local Discovery Service Bundle
[  32] [Active     ] [   30] CXF Distributed Software Bundle
[  33] [Active     ] [   31] Apache ServiceMix Specs :: SAAJ API 1.3 (1.0.0)
[  34] [Active     ] [   32] Apache ServiceMix Specs :: STAX API 1.0 (1.0.0)
[  35] [Active     ] [   33] Apache ServiceMix Specs :: JAXB API 2.0 (1.0.0)
[  36] [Active     ] [   34] Apache ServiceMix Specs :: JAXWS API 2.0 (1.0.0)

Using Equinox

Verified with: Eclipse Equinox 3.5M4

Append the contents of the equinox.config.ini.append file to your Equinox configuration/config.ini file. Or create a new config.ini file with the contents of the equinox.config.ini.append file if you don't have one.

Then start up equinox as normal. You will get something like this (for the single-bundle distribution):

java -jar plugins\org.eclipse.osgi_3.5.0.v20081201-1815.jar -configuration configuration -console 
... log output ommitted ...
osgi> ss
Framework is launched.

id      State       Bundle
0       ACTIVE      org.eclipse.osgi_3.5.0.v20081201-1815
1       ACTIVE      org.eclipse.osgi.services_3.2.0.v20081205-1800
2       ACTIVE      cxf-dosgi-ri-singlebundle-distribution

Using Equinox from with the Eclipse IDE

This option is really handy for debugging. Verified with: Eclipse 3.5M4
Setting up Eclipse for Running and Debugging Distributed OSGi

Reference

See Distributed OSGi Reference pages.

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