Starting today the conference OSGi DevCon Europe 2009 takes place in Zurich (in association with the Jazoon conference). Two talks will be given by Day's OSGi experts:
Felix Meschberger: Declarative Services: Dependency Injection OSGi style
2009-06-22, 11:20
Applications in general and OSGi applications in particular consist of a host of different modules and services which need to be bound together to form the actual application. In a traditional application services are generally bound by calling factories or instantiating the service classes or accessing a registry of services. In recent years a new buzz-word entered the arena: Dependency Injection. With dependency injection services are provided to the service clients as they become available. Likewise configuration is injected into the services, that is services do manage their configuration themselves. The OSGi specification for dependency injection is the Declarative Services specification: The components are declared and indicate what services they use and require and may in addition be provided with configuration. This talk shows the benefit of using Declarative Services and how the Apache Felix Maven SCR Plugin simplifies the service declaration even more.
Update: find Felix' slides below
Betrand Delacretaz: Tales from the OSGi trenches
2009-06-22, 14:60
In this talk we share our experience of using OSGi for a major rewrite of Day's family of content management products. After more than two years working with OSGi, the impact on our products, developers, customers and service people is very high, in a positive way. OSGi is no silver bullet either. The extreme modularization and dynamic service deployment features of OSGi make our products much more robust and maintainable, but the costs associated with changing people's way of thinking about code and modules, and with testing and debugging highly dynamic systems, must not be underestimated. Based on real-life code samples, we will show how OSGi is used at several levels in our products, from low-level interactions with the framework to very simple creation of (compiled or scripted) services. We will also present some of the automated testing techniques used in our project. Sharing our experience will help you decide if OSGi is for you, and more importantly at which level you should use it.