R binding for NNG (Nanomsg Next Gen), a successor to ZeroMQ. NNG is a socket library providing high-performance scalability protocols, a cross-platform standard for messaging and communications. Serves as a concurrency framework for building distributed applications, utilising 'aio' objects which resolve automatically upon completion of asynchronous operations. Implements connections with transport layer security, and synchronisation primitives, which allow R execution to wait upon events being signalled by concurrent messaging threads.
nanonext offers 2 equivalent interfaces: a functional interface, and an object-oriented interface.
The primary object in the functional interface is the Socket. Use
socket to create a socket and dial or listen at an address.
The socket is then passed as the first argument of subsequent actions
The primary object in the object-oriented interface is the nano object.
nano to create a nano object which encapsulates a Socket
and Dialer/Listener. Methods such as
then be accessed directly from the object.
Guide to the implemented protocols for sockets: protocols
Guide to the supported transports for dialers and listeners: transports
Guide to the options that can be inspected and set using: opt / opt<-
NNG presents a socket view of networking. The sockets are constructed using protocol-specific functions, as a given socket implements precisely one protocol.
Each socket can be used to send and receive messages (if the protocol supports it, and implements the appropriate protocol semantics). For example, sub sockets automatically filter incoming messages to discard those for topics that have not been subscribed.
NNG sockets are message oriented, so that messages are either delivered wholly, or not at all. Partial delivery is not possible. Furthermore, NNG does not provide any other delivery or ordering guarantees; messages may be dropped or reordered (some protocols, such as req may offer stronger guarantees by performing their own retry and validation schemes).
Each socket can have zero, one, or many endpoints, which are either listeners or dialers (a given socket may freely choose whether it uses listeners, dialers, or both). These endpoints provide access to underlying transports, such as TCP, etc.
Each endpoint is associated with a URL, which is a service address. For dialers, this will be the service address that will be contacted, whereas for listeners this is where the listener will accept new connections.