Module Rpc

module Rpc: sig .. end

The approach here is to have a separate representation of the server-side implementation of an RPC (An Implementation.t) and the interface that it exports (either an Rpc.t, a State_rpc.t or a Pipe_rpc.t, but we'll refer to them generically as RPC interfaces). A server builds the Implementation.t out of an RPC interface and a function for implementing the RPC, while the client dispatches a request using the same RPC interface.

The Implementation.t hides the type of the query and the response, whereas the Rpc.t is polymorphic in the query and response type. This allows you to build a Implementations.t out of a list of Implementation.ts.

Each RPC also comes with a version number. This is meant to allow support of multiple different versions of what is essentially the same RPC. You can think of it as an extension to the name of the RPC, and in fact, each RPC is uniquely identified by its (name, version) pair. RPCs with the same name but different versions should implement similar functionality.

module Implementation: sig .. end

module Implementations: sig .. end

module type Connection = Connection  with module Implementations := Implementations

module Connection: Connection 

module Rpc: sig .. end

module Pipe_rpc: sig .. end

module State_rpc: sig .. end