[CONF] Apache Felix: Architecture Handler (page edited)

[confluence]

Page Edited : FELIX : Architecture Handler Architecture Handler has been edited by Clement Escoffier (Oct 19, 2006). (View changes) Content: Architecture Handler The architecture feature allows obtaining an architectural / component view of your systems. It exposes a snapshot of the present components, the state of these components, the state fo the dependencies ... To use the arch command, you need to install the arch command bundle available here. Reflection on the component The architecture feature does some "reflection" on the iPOJO containers. It gathers information about the component (state, class name ...), dependencies (state, multiple, optional ...), provided services (state, properties) ... This information allows you to know why a component does not start, or why the component does not publish / provide a service. Metadata To allow the architecture to introspect the container, you need to add a attribute "architecture=true" to the component element: <Component className="fr.imag.adele.escoffier.hello.impl.HelloServiceImpl" architecture="true"> By default, the architecture feature is disabled. The "arch" command A Felix command comes with the architecture handler. This command looks for all component exposing the architecture and print the information: => arch Component : fr.imag.adele.escoffier.hello.impl.HelloServiceImpl - VALID Dependency : org.osgi.service.log.LogService - RESOLVED - Optional : true - Multiple : false Provides : fr.imag.adele.escoffier.hello.HelloService - REGISTERED Service Property : floor_ = 2 Service Property : coucou = coucou Service Property : empty = true Service Property : language = fr Component : fr.imag.adele.escoffier.hello.impl.HelloServiceImpl2 - VALID Dependency : org.osgi.service.log.LogService - RESOLVED - Optional : true - Multiple : false Provides : fr.imag.adele.escoffier.hello.HelloService - REGISTERED Technical information In fact, when a component enables the architecture introspection, its container exposes an Architecture service. Any architecture requester can obtain information about the component. For example, the arch command request all the architecture service and print the information. Limitation and perspectives The architecture feature use some implementation details of the different other features (Dependency, Provided service ...). Therefore, if you change the implementation of this feature, the architecture does not more work. Moreover, we are working one a graphical view of the architecture.

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