gistfile1.scala

    final val TypeField = "$type"
    final val ObjectField = "$object"
    
    def encode[T <: Message](msg: T): Array[Byte] = {
      val schema: protostuff.Schema[T] = msg.schema.asInstanceOf[protostuff.Schema[T]]
      
      val out = new java.io.ByteArrayOutputStream
      val context = new org.codehaus.jackson.io.IOContext(protostuff.JsonIOUtil.DEFAULT_JSON_FACTORY._getBufferRecycler(), out, false);
      val generator = protostuff.JsonIOUtil.newJsonGenerator(out, context.allocWriteEncodingBuffer)
      
      generator.writeStartObject
      generator.writeStringField(TypeField, schema.messageName)
      generator.writeFieldName(ObjectField)
      
      try {
        protostuff.JsonIOUtil.writeTo(generator, msg, schema, false)
      } finally {
        generator.writeEndObject
        generator.close
      }
      
      out.toByteArray
    }