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Table of Contents
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OSGi (Open Services Gateway Initiative)- Dynamic Module System for Java (with accompanying service portfolios)
- Provides a mechanism to break an application into modules for which:
- dependencies are explicitly defined and must be provided
- the services provided by the module are explicitly defined
- versions of dependencies and services are understood
- configuration and other services are managed by the framework
- Applications run inside of an OSGi framework which performs all of the dependency checking
- Dynamic
- Applications/modules can be installed, uninstalled, started, and stopped on-the-fly
- An OSGi bundle is simply a standard Java jar with the addition of a Manifest which specifies the services that the module provides as well as the modules dependencies (among other things)
Spring DM (Dynamic Modules)- Allows for the creation of OSGi bundles through the use of Spring xml
- Provides a way to support OSGi without your code needing to be aware of OSGi (or Spring)
- OSGi services can be injected into application-wired Spring-beans
- Application services can be deployed as OSGi services
- Especially useful if you intend to take advantage of Spring for other purposes within your application
- PAX Construct provides scripts which handle some of the setup/configuration of an OSGi project
- Maven plugins for creating bundle artifacts
- JUnit integration test support
Misc- Web Application support
- Bundle configuration (fragments)
References
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