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# From Functional I/O to Functional Systems Programming
# Marketplace: Bringing the Network into the Programming Language
Support code for ICFP submission.
Marketplace is a concurrent language able to express communication,
enforce isolation, and manage resources. Network-inspired extensions
to a functional core represent imperative actions as values, giving
side-effects locality and enabling composition of communicating
processes.
Collaborating programs are grouped within task-specific *virtual
machines* (VMs) to scope their interactions. Conversations between
programs are multi-party (using a publish/subscribe medium), and
programs can easily participate in many such conversations at once.
Marketplace makes *presence* notifications an integral part of
pub/sub. Programs react to presence and absence notifications that
report the comings and goings of their peers. Presence serves to
communicate changes in demand for and supply of services, both within
a VM and across *nested VM layers*. Programs can give up
responsibility for maintaining presence information and for scoping
group communications to their containing VM.
## Documentation
A (draft) manual for Marketplace is available
[here](http://tonyg.github.io/marketplace/).
This is a [Racket](http://racket-lang.org/) package containing a
single
## The code
This repository contains a [Racket](http://racket-lang.org/) package
containing a single
[collection](http://docs.racket-lang.org/reference/collects.html),
`marketplace`, which includes
- the implementation of the `#lang marketplace` language from the
paper, in
- the implementation of the `#lang marketplace` language, in
[`marketplace/`](https://github.com/tonyg/marketplace/tree/master/marketplace/).
- the echo server example from the paper, in
- a TCP echo server example, in
[`marketplace/examples/echo-paper.rkt`](https://github.com/tonyg/marketplace/tree/master/marketplace/examples/echo-paper.rkt).
- the chat server example from the paper, in
- a TCP chat server example, in
[`marketplace/examples/chat-paper.rkt`](https://github.com/tonyg/marketplace/tree/master/marketplace/examples/chat-paper.rkt).
- the Haskell, Erlang and Python implementations of the chat server
from the paper, in
- Haskell, Erlang and Python implementations of the chat server for comparison, in
[`marketplace/examples/chat.hs`](https://github.com/tonyg/marketplace/tree/master/marketplace/examples/chat.hs),
[`chat.erl`](https://github.com/tonyg/marketplace/tree/master/marketplace/examples/chat.erl),
and
[`chat.py`](https://github.com/tonyg/marketplace/tree/master/marketplace/examples/chat.py)
respectively.
## How to compile and run the code
## Compiling and running the code
You will need the latest **prerelease** version of Racket. Any version
newer than or equal to Racket 5.3.3.7 should work. Nightly-build
newer than or equal to Racket 5.3.4.11 should work. Nightly-build
installers for Racket can be downloaded
[here](http://pre.racket-lang.org/installers/).