Message Function

From pbdZMQ v0.2-1 by Wei-Chen Chen

Message Functions

Message functions

Keywords: programming

Usage

zmq.msg.send(rmsg, socket, flags = .pbd_env$ZMQ.SR$BLOCK, serialize = TRUE)
zmq.msg.recv(socket, flags = .pbd_env$ZMQ.SR$BLOCK, unserialize = TRUE)

Arguments

rmsg: an R message
socket: a ZMQ socket
flags: a flag for method of send and receive
serialize: if serialize the rmsg
unserialize: if unserialize the received R message

Details

zmq.msg.send() sends an R message.

zmq.msg.recv() receives an R message.

Value

zmq.msg.send() returns 0 if successful, otherwise returns -1 and sets errno to EFAULT.
zmq.msg.recv() returns the message if successful, otherwise returns -1 and sets errno to EFAULT.

References

ZeroMQ/4.1.0 API Reference: http://api.zeromq.org/4-1:_start

Programming with Big Data in R Website: http://r-pbd.org/

Examples

### Using request-reply pattern.

### At the server, run next in background or the other window.
library(pbdZMQ, quietly = TRUE)

context <- zmq.ctx.new()
responder <- zmq.socket(context, .pbd_env$ZMQ.ST$REP)
zmq.bind(responder, "tcp://*:5555")
buf <- zmq.msg.recv(responder)
set.seed(1234)
ret <- rnorm(5)
print(ret)
zmq.msg.send(ret, responder)
zmq.close(responder)
zmq.ctx.destroy(context)


### At a client, run next in foreground.
library(pbdZMQ, quietly = TRUE)

context <- zmq.ctx.new()
requester <- zmq.socket(context, .pbd_env$ZMQ.ST$REQ)
zmq.connect(requester, "tcp://localhost:5555")
zmq.msg.send(NULL, requester)
ret <- zmq.msg.recv(requester)
print(ret)
zmq.close(requester)
zmq.ctx.destroy(context)

Documentation reproduced from package pbdZMQ, version 0.2-1, License: GPL-3

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