OSGi

The OSGi Alliance (formerly known as the Open Services Gateway initiative) is an open standards organization founded in March 1999. The Alliance and its members have specified a Java-based service platform that can be remotely managed. The core part of the specifications is a framework that defines an application life cycle management model, a service registry, an Execution environment and Modules. Based on this framework, a large number of OSGi Layers, APIs, and Services have been defined.
Keep on reading Wikipedia OSGi definition.

Learn

Official documentation

1. Specifications
¬ OSGi Service Platform Release 4 Version 4.2 – Early Draft

Books

Neil BARTLETT - OSGi in Practice OSGi In Practice, by Neil Bartlett [Draft]
PACKT - OSGi and Apache Felix 3.0 : Beginner's Guide OSGi and Apache Felix 3.o
Beginner’s Guide
PACKT publishing

Other sources

Creating OSGi bundles, by Costin Leau, on 18th february, 2008.
Dynamic Java web site.
OSGi Look web site
[FR] La plate-forme dynamique de service OSGi™, by Didier Donsez

Blogs

Implementations

¬ Knopflerfish
¬ Apache Felix
¬ Eclipse Equinox
¬ Concierge OSGi

Component Model frameworks

¬ BluePrint Services
¬ iPojo
¬ Peaberry
¬ SCA OSGi
¬ Service Component Runtime (SCR), a.k.a. Declarative Services (DS), specified in §112 of service compendium
¬ SpringDM (Dynamic module)

Projects

Apache CXF

Apache CXF is an open source services framework.
The Apache CXF Distributed OSGi subproject provides the Reference Implementation of the Distribution Provider component of the OSGi Remote Services Specification (Chapter 13 in the OSGi 4.2 Compendium Specification).
¬ User Guide
¬ Apache CFX API

ETH Zurich Projects

¬ flowSGi Project
flowSGi is an approach for a Collaborative Middleware for Mobile Devices . It brings together the paradigm of Fluid Computing and the dynamic of the OSGi . The project was initiated as a master’s thesis by Jan S. Rellermeyer and is now an ongoing research project at Information and Communication Systems Research Group (IKS) at ETH Zurich .

¬ R-OSGi
R-OSGi runs as an OSGi bundle and facilitates distribution for arbitrary OSGi framework implementations.
–¬ R-OSGi API

Main concepts

Layers interaction

OSGi - Layers interaction [Source : OSGi & Apache Felix 3.o]

Bundle life cycle

OSGi Bundles' life cycle [Source : OSGi and Apache felix 3.o]

OSGi Commands

Command Description
start Starts a bundle given an ID or symbolic name
stop Stops a bundle given an ID or symbolic name
install Adds a bundle given a URL for the current instance
uninstall Removes a bundle given a URL for the current instance
update Updates a bundle given a URL for the current instance
active Lists all active bundles in the current instance
headers List the headers for a bundle given an ID or symbolic name
ss Lists a short status of all the bundles registered in the current instance
services Lists services given the proper filter
diag Runs diagnostics on a bundle given an ID or symbolic name
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