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

[confluence]

Page Edited : FELIX : Architecture Handler Architecture Handler has been edited by Clement Escoffier (Aug 17, 2007). (View changes) Content: Architecture Handler The architecture feature allows obtaining an architectural / component view of your systems. It exposes a snapshot of the present instances & factories, the state of these instances ... Moreover, iPOJO defines an 'arch' command displaying this architecture in Felix. You need to install the arch command bundle available in the Felix trunk. Reflection on the component The architecture feature does "reflection" on the iPOJO containers. It gathers information about the component (state, class name ...), requirement (state, multiple, optional ...), provided services (state, properties) ... Each handler can participate to the architecutre. This information allows you to know why a instance 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 => displays instances name & state (equivalent to arch -instances) arch -instance $instance_name => displays complete information about the instance $instance_name arch -factories => display the list of available factories arch -factory $factory_name => display complete information about the factory $factory_name 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.

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