This is something I think Doug has been trying to tell me to do from the
start :-)
The main idea is to remove all the MessageHandlingServer subclasses and,
instead, if you want a server which is hooked up with the RPC dispatcher
you just use this convenience function:
server = rpc_server.get_rpc_server(transport, target, endpoints)
This means the dispatcher interface is now part of the public API, but
that should be fine since it's very simple - it's a callable that takes
a request context and message.
However, we also need to be able to construct a MessageHandlingServer
with a specific executor. By having an executor_cls parameter to the
constructor as part of the public API, we'd be exposing the executor
interface which is quite likely to change. Instead - and this seems
obvious in retrospect - just use stevedore to load executors and allow
them to be requested by name:
server = rpc_server.get_rpc_server(transport, target, endpoints,
executor='eventlet')
This also means we can get rid of openstack.common.messaging.eventlet.
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