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About pkg-config: From http://www.freedesktop.org/wiki/Software/pkg-config pkg-config is a helper tool used when compiling applications and libraries. It helps you insert the correct compiler options on the command line so an application can use gcc -o test test.c `pkg-config --libs --cflags glib-2.0` for instance, rather than hard-coding values on where to find glib (or other libraries). It is language-agnostic, so it can be used for defining the location of documentation tools, for instance. pkg-config is a widely used build helper tool. Major build tools such as GNU Autoconf, CMake and so on support pkg-config. MessagePack users can build their software more easily.
MessagePack
Extremely efficient object serialization library. It's like JSON, but very fast and small.
What's MessagePack?
MessagePack is a binary-based efficient object serialization library. It enables to exchange structured objects between many languages like JSON. But unlike JSON, it is very fast and small.
Typical small integer (like flags or error code) is saved only in 1 byte, and typical short string only needs 1 byte except the length of the string itself. [1,2,3] (3 elements array) is serialized in 4 bytes using MessagePack as follows:
require 'msgpack'
msg = [1,2,3].to_msgpack #=> "\x93\x01\x02\x03"
MessagePack.unpack(msg) #=> [1,2,3]
MessagePack-RPC is cross-language RPC library for client, server and cluster applications. Because it releases you from complicated network programming completely and provides well-designed API, you can easily implement advanced network applications with MessagePack-RPC.
require 'msgpack/rpc'
class MyHandler
def add(x,y) return x+y end
end
svr = MessagePack::RPC::Server.new
svr.listen('0.0.0.0', 18800, MyHandler.new)
svr.run
require 'msgpack/rpc'
c = MessagePack::RPC::Client.new('127.0.0.1',18800)
result = c.call(:add, 1, 2) #=> 3
Getting Started
Usage and other documents about implementations in each language are found at the web site.