Book Image

Julia 1.0 Programming - Second Edition

By : Ivo Balbaert
Book Image

Julia 1.0 Programming - Second Edition

By: Ivo Balbaert

Overview of this book

The release of Julia 1.0 is now ready to change the technical world by combining the high productivity and ease of use of Python and R with the lightning-fast speed of C++. Julia 1.0 programming gives you a head start in tackling your numerical and data problems. You will begin by learning how to set up a running Julia platform, before exploring its various built-in types. With the help of practical examples, this book walks you through two important collection types: arrays and matrices. In addition to this, you will be taken through how type conversions and promotions work. In the course of the book, you will be introduced to the homo-iconicity and metaprogramming concepts in Julia. You will understand how Julia provides different ways to interact with an operating system, as well as other languages, and then you'll discover what macros are. Once you have grasped the basics, you’ll study what makes Julia suitable for numerical and scientific computing, and learn about the features provided by Julia. By the end of this book, you will also have learned how to run external programs. This book covers all you need to know about Julia in order to leverage its high speed and efficiency for your applications.
Table of Contents (17 chapters)
Title Page
Copyright and Credits
Packt Upsell

Working with TCP sockets and servers

To send data over a network, the data has to conform to a certain format or protocol. The Transmission Control Protocol / Internet Protocol (TCP/IP) is one of the core protocols to be used on the internet.

The following screenshot shows how to communicate over TCP/IP between a Julia TCP server and a client (see the code in Chapter 8\tcpserver.jl):

The server (in the upper-left corner) is started in a Julia session with server = Sockets.listen(8080), which returns a TcpServer object listening on port 8080. The conn = accept(server) line waits for an incoming client to make a connection. In a second terminal (in the lower-right corner), we start the netcat (nc) tool at the prompt to make a connection with the Julia server on port 8080, for example, nc localhost 8080. Then, the accept function creates a TcpSocket object on which the server can read or write.

Then, the server issues the line = readline(conn) command, blocking the server until it gets a full...