On Aug 31, 2014, at 11:36 AM, Jacopo Cappellato <jacopo.cappell...@hotwaxmedia.com> wrote:
> a) what is the original concern of DispatchContext and of GenericDispatcher This comes from this old but still interesting document: http://ofbiz.apache.org/docs/services.html ======================================== *Service Dispatcher* The Service Dispatcher handles dispatching services to the appropriate Service Engine where it is then invoked. There is exactly one ServiceDispatcher for each Entity Delegator. If there are multiple delegators in an application there will also be multiple dispatchers. The ServiceDispatcher is accessed via a LocalDispatcher. There can be many LocalDispatchers associated with a ServiceDispatcher. Each LocalDispatcher is uniquely named and contains its own list of service definitions. When creating an instance of a LocalDispatcher, a DispatchContext is also created and passed to the ServiceEngine. A LocalDispatcher is associated with an application. Applications never talk directly to the ServiceDispatcher. The LocalDispatcher contains an API for invoking services, which are routed through the ServiceDispather. However, applications may be running in different threads than the actual ServiceDispatcher, so it is left to the LocalDispatcher to keep a DispatchContext which among other things keeps a reference to the applications classloader. *Dispatch Context* The DispatchContext is created by the LocalDispatcher upon instantiation. This is the runtime dispatcher context. It contains necessary information to process services for each dispatcher. This context contains the reference to each of the service definition files, the classloader which should be used for invocation, a reference to the delegator and its dispatcher along with a 'bag' of user defined attributes. This context is passed on to each service when invoked and is used by the dispatcher to determine the service's model. ======================================== Jacopo
