# 0. Understanding The Structure ====

JSON, 40 Bytes UTF-8

----------------------------------------------
| {"name":"John Doe","age":12}               |
----------------------------------------------
|  {"         | 7B 22                        |
|    name     | 6E 61 6D 65                  |
|  ":"        | 22 3A 22                     |
|    John Doe | 4A 6F 68 6E 20 44 6F 65      |
|  ","        | 22 2C 22                     |
|    age      | 61 67 65                     |
|  ":         | 22 3A 20                     |
|    12       | 31 32                        |
|  }          | 7D                           |
----------------------------------------------


MessagePack, 27 Bytes UTF-8

----------------------------------------------
| ‚¤name¨John Doe£age.12                     |
----------------------------------------------
|  ‚¤         | 82 84                        |
|    name     | 6E 61 6D 65                  |
|  ¨          | A8                           |
|    John Doe | 4A 6F 68 6E 20 44 6F 65      |
|  £          | A3                           |
|    age      | 61 67 65                     |
|  .          | 0C                           |
|    12       | 31 32                        |
----------------------------------------------

# 1. JAVA ====

""" Installing with Maven
"""

<dependencies>
  ...
  <dependency>
    <groupId>org.msgpack</groupId>
    <artifactId>msgpack</artifactId>
    <version>${msgpack.version}</version>
  </dependency>
  ...
</dependencies>


""" Simple Serialization/Deserialization
"""

// Create serialize objects.
List<String> src = new ArrayList<String>();
src.add("msgpack");
src.add("kumofs");

MessagePack msgpack = new MessagePack();
// Serialize
byte[] raw = msgpack.write(src);

// Deserialize directly using a template
List<String> dst1 = msgpack.read(raw, Templates.tList(Templates.TString));
System.out.println(dst1.get(0));
System.out.println(dst1.get(1));

// Or, Deserialze to Value then convert type.
Value dynamic = msgpack.read(raw);
List<String> dst2 = new Converter(dynamic)
    .read(Templates.tList(Templates.TString));
System.out.println(dst2.get(0));
System.out.println(dst2.get(1));


# 2. RUBY ====

""" Installing the Gem
"""

gem install msgpack

""" Streaming API
"""

# serialize a 2-element array [e1, e2]
pk = MessagePack::Packer.new(io)
pk.write_array_header(2).write(e1).write(e2).flush

# deserialize objects from an IO
u = MessagePack::Unpacker.new(io)
u.each { |obj| ... }

# event-driven deserialization
def on_read(data)
  @u ||= MessagePack::Unpacker.new
  @u.feed_each(data) { |obj| ... }
end

# 3. NODE.JS ====

""" Installing with NPM
"""

npm install msgpack5 --save

""" Using in Node
"""

var msgpack = require('msgpack5')() // namespace our extensions
  , a       = new MyType(2, 'a')
  , encode  = msgpack.encode
  , decode  = msgpack.decode

msgpack.register(0x42, MyType, mytipeEncode, mytipeDecode)

console.log(encode({ 'hello': 'world' }).toString('hex'))
// 81a568656c6c6fa5776f726c64
console.log(decode(encode({ 'hello': 'world' })))
// { hello: 'world' }
console.log(encode(a).toString('hex'))
// d5426161
console.log(decode(encode(a)) instanceof MyType)
// true
console.log(decode(encode(a)))
// { value: 'a', size: 2 }

function MyType(size, value) {
  this.value = value
  this.size  = size
}

function mytipeEncode(obj) {
  var buf = new Buffer(obj.size)
  buf.fill(obj.value)
  return buf
}

function mytipeDecode(data) {
  var result = new MyType(data.length, data.toString('utf8', 0, 1))
    , i

  for (i = 0; i < data.length; i++) {
    if (data.readUInt8(0) != data.readUInt8(i)) {
      throw new Error('should all be the same')
    }
  }

  return result
}