OSGi , Spring OSGi and the server-side. Part 1
Friday 29 June 2007
I want to post here some information that will help you to find out more about OSGi and how Spring Framework work with it.
First I want to say few words about OSGi technology.
From Wikipedia, the free encyclopedia:
"The OSGi Alliance (formerly known as the Open Services Gateway initiative - now an obsolete name) 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 model and a service registry. Based on this framework, a large number of OSGi Layers, APIs, and Services have been defined: Security, Module, Life Cycle, and Service Layers; Framework API; Package Admin Service; Start Level Service; Conditional Permission Admin; Permission Admin Service; URL Handlers Service; Log Service; HTTP Service (runs servlets); Device Access; Configuration Admin Service; Metatype Service; Preferences Service; User Admin Service; Wire Admin Service; I/O Connector Service; Initial Provisioning; UPnP Device Service; Declarative Services; Event Admin Service; Deployment Admin; Auto Configuration; Application Admin Service; DMT Admin Service; Monitor Admin Service; Foreign Application Service; Service Tracker; XML Parser Service; Position; Measurement and State; and Execution Environments.
"The OSGi specification is developed by the members in an open process and made available to the public free of charge under the OSGi Specification License. The OSGi Alliance has a compliance program that is open to members only. As of January 2007, the list of certified OSGi implementations contains 3 entries."
OSGi in fact:
"OSGi technology is the dynamic module system for Java™. The OSGi Service Platform provides functionality to Java that makes Java the premier environment for software integration and thus for development. Java provides the portability that is required to support products on many different platforms. The OSGi technology provides the standardized primitives that allow applications to be constructed from small, reusable and collaborative components. These components can be composed into an application and deployed.
The OSGi Service Platform provides the functions to change the composition dynamically on the device of a variety of networks, without requiring restarts. To minimize the coupling, as well as make these couplings managed, the OSGi technology provides a service-oriented architecture that enables these components to dynamically discover each other for collaboration. The OSGi Alliance has developed many standard component interfaces for common functions like HTTP servers, configuration, logging, security, user administration, XML and many more. Plug-compatible implementations of these components can be obtained from different vendors with different optimizations and costs. However, service interfaces can also be developed on a proprietary basis.
OSGi technology adopters benefit from improved time-to-market and reduced development costs because OSGi technology provides for the integration of pre-built and pre-tested component subsystems. The technology also reduces maintenance costs and enables unique new aftermarket opportunities because components can be dynamically delivered to devices in the field. "
To be continued...
- Resources:
- OSGI Alliance
- OSGi in Wikipedia
- OSGi Blog
Posted byEugene at 04:42