Open a new Context to be used with a Socket. The purpose of a Context is to permit applications to share a single socket, with its underlying dialers and listeners, while still benefiting from separate state tracking.
context(socket)a Socket.
A Context (object of class 'nanoContext' and 'nano').
Contexts allow the independent and concurrent use of stateful operations using the same socket. For example, two different contexts created on a rep socket can each receive requests, and send replies to them, without any regard to or interference with each other.
Only the following protocols support creation of contexts: req, rep, sub (in a pub/sub pattern), surveyor, respondent.
To send and receive over a context use send and
recv or their async counterparts send_aio and
recv_aio.
For nano objects, use the $context_open() method, which will
attach a new context at $context. See nano.
s <- socket("req", listen = "inproc://nanonext")
ctx <- context(s)
ctx
#> < nanoContext >
#> - id: 1
#> - socket: 3
#> - state: opened
#> - protocol: req
close(ctx)
close(s)
n <- nano("req", listen = "inproc://nanonext")
n$context_open()
n$context
#> < nanoContext >
#> - id: 2
#> - socket: 4
#> - state: opened
#> - protocol: req
n$context_open()
n$context
#> < nanoContext >
#> - id: 3
#> - socket: 4
#> - state: opened
#> - protocol: req
n$context_close()
#> [1] 0
n$close()