jackson-dataformat-msgpack

This Jackson extension library handles reading and writing of data encoded in MessagePack data format. It extends standard Jackson streaming API (JsonFactory, JsonParser, JsonGenerator), and as such works seamlessly with all the higher level data abstractions (data binding, tree model, and pluggable extensions).

Maven dependency

To use this module on Maven-based projects, use following dependency:

<dependency>
  <groupId>org.komamitsu</groupId>
  <artifactId>jackson-dataformat-msgpack</artifactId>
  <version>0.0.2</version>
</dependency>

Usage

Only thing you need to do is to instantiate MessagePackFactory and pass it to the constructor of ObjectMapper.

  ObjectMapper objectMapper = new ObjectMapper(new MessagePackFactory());
  ExamplePojo orig = new ExamplePojo("komamitsu");
  byte[] bytes = objectMapper.writeValueAsBytes(orig);
  ExamplePojo value = objectMapper.readValue(bytes, ExamplePojo.class);
  System.out.println(value.getName()); // => komamitsu

Also, you can exchange data among multiple languages.

Java

  // Serialize
  Map<String, Object> obj = new HashMap<String, Object>();
  obj.put("foo", "hello");
  obj.put("bar", "world");
  byte[] bs = objectMapper.writeValueAsBytes(obj);
  // bs => [-126, -93, 102, 111, 111, -91, 104, 101, 108, 108, 111,
  //        -93, 98, 97, 114, -91, 119, 111, 114, 108, 100]

Ruby

  require 'msgpack'

  # Deserialize
  xs = [-126, -93, 102, 111, 111, -91, 104, 101, 108, 108, 111,
        -93, 98, 97, 114, -91, 119, 111, 114, 108, 100]
  MessagePack.unpack(xs.pack("C*"))
  # => {"foo"=>"hello", "bar"=>"world"}

  # Serialize
  ["zero", 1, 2.0, nil].to_msgpack.unpack('C*')
  # => [148, 164, 122, 101, 114, 111, 1, 203, 64, 0, 0, 0, 0, 0, 0, 0, 192]

Java

  // Deserialize
  bs = new byte[] {(byte) 148, (byte) 164, 122, 101, 114, 111, 1,
                   (byte) 203, 64, 0, 0, 0, 0, 0, 0, 0, (byte) 192};
  TypeReference<List<Object>> typeReference = new TypeReference<List<Object>>(){};
  List<Object> xs = objectMapper.readValue(bs, typeReference);
  // xs => [zero, 1, 2.0, null]