IGB Developer's Guide
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  • The java standard for Plugins is OSGi (http://www.osgi.org), this is what IGB (written in java) uses.
  • the OSGi term for a Plugin is Bundle, they mean the same thing.
  • an OSGi bundle is a jar file. It must have a MANIFEST.MF file with the OSGi headers (see below).
  • an OSGi bundle can (usually will) have a special java class called an Activator. This class must extend org.osgi.framework.BundleActivator, and implement the start() and stop() method. The activator class is specified in the Bundle-Activator bundle header (see below). These methods are called when the bundle is started and stopped.
  • when a program is running with OSGi, the OSGi framework dynamically handles installing / uninstalling,
    activating (starting), deactivating (stopping), and upgrading bundles.
  • There are several implementations of OSGi, including:
    1. Apache Felix (http://felix.apache.org/)
    2. Eclipse Equinox (http://www.eclipse.org/equinox/)
    3. Knoplerfish (http://www.knopflerfish.org/)
  • the implementations are (for the most part) interchangeable and are free
  • the implementations allow the user to run OSGi from a command line tool or to start it within a program
  • IGB starts the felix implementation from with the com.affymetrix.igb.main.OSGiHandler class, but IGB can
    be run using the Felix command line tool by running ant gogo
  • there are several tutorials for OSGi, including:
    1. How to get Started with OSGi (http://www.osgi.org/About/HowOSGi)
    2. Apache Felix OSGi Tutorial (http://felix.apache.org/site/apache-felix-osgi-tutorial.html)
    3. OSGi for Beginners (http://www.theserverside.com/news/1363825/OSGi-for-Beginners)
    4. OSGi with Eclipse Equinox - Tutorial (http://www.vogella.de/articles/OSGi/article.html)
  • IGB uses OBR (http://felix.apache.org/site/apache-felix-osgi-bundle-repository.html) to find and load bundles . Web Servers that host bundles from web servers (repositories). The web servers need to use OBR to create the repository.xml file
    listing all the available bundles.
  • Users can add /remove bundle repositories on the Preferences page.
  • IGB uses OSGi Services to allow bundles to add new implementations of existing IGB elements. The new implementations will show up as soon as the bundle is started. Examples are the IGB tabs and the graph functions.

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