jackson-databind memo

  Map<String, Object> map = new HashMap<>();
  map.put("name", "komamitsu");
  map.put("age", 39);
  ObjectMapper objectMapper = new ObjectMapper();
  String serialized = objectMapper.writeValueAsString(map);
  System.out.println(serialized);
  Map<String, Object> deserialized =
          objectMapper.readValue(serialized, new TypeReference<Map<String, Object>>() { });
  System.out.println(deserialized);

  String serialized = objectMapper.writeValueAsString(map);
    com.fasterxml.jackson.core.JsonFactory#createGenerator(java.io.Writer)
    com.fasterxml.jackson.databind.ObjectMapper#_configAndWriteValue(com.fasterxml.jackson.core.JsonGenerator, java.lang.Object)
    _configAndWriteValue(_jsonFactory.createGenerator(sw), value);
    _serializerProvider(cfg).serializeValue(jgen, value);
    final JsonSerializer<Object> ser = findTypedValueSerializer(cls, true, null);
    com.fasterxml.jackson.databind.SerializerProvider#findValueSerializer(java.lang.Class<?>, com.fasterxml.jackson.databind.BeanProperty)
    com.fasterxml.jackson.databind.SerializerProvider#_createAndCacheUntypedSerializer(java.lang.Class<?>)
    com.fasterxml.jackson.databind.cfg.MapperConfig#constructType(java.lang.Class<?>)
      return getTypeFactory().constructType(cls, (TypeBindings) null);
    com.fasterxml.jackson.databind.type.TypeFactory#_constructType
        type=class java.util.HashMap
        // simple class?
        if (type instanceof Class<?>) {
            Class<?> cls = (Class<?>) type;
            resultType = _fromClass(cls, context);
    com.fasterxml.jackson.databind.type.TypeFactory#_fromClass
    public ClassKey(Class<?> clz)
    {
        _class = clz;
        _className = clz.getName();
        _hashCode = _className.hashCode();
    }
    TypeSerializer typeSer = _serializerFactory.createTypeSerializer(_config, _config.constructType(valueType));
    com.fasterxml.jackson.databind.ser.BasicSerializerFactory#createTypeSerializer
      baseType=[map type; class java.util.HashMap, [simple type, class java.lang.Object] -> [simple type, class java.lang.Object]]
    com.fasterxml.jackson.databind.introspect.BasicClassIntrospector#forClassAnnotations
        AnnotatedClass ac = bean.getClassInfo();
        AnnotationIntrospector ai = config.getAnnotationIntrospector();
        TypeResolverBuilder<?> b = ai.findTypeResolver(config, ac, baseType);
        ac=[AnnotedClass java.util.HashMap]
        ai=com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector@5f9c449f
    com.fasterxml.jackson.databind.introspect.AnnotatedClass#resolveClassAnnotations
        for (Class<?> cls : _superTypes) {
            // and mix mix-in annotations in-between
            _addClassMixIns(_classAnnotations, cls);
            _addAnnotationsIfNotPresent(_classAnnotations, cls.getDeclaredAnnotations());
        }
        _superTypes = {java.util.ArrayList@1540} size = 4
        [0] = {java.lang.Class@77}"interface java.util.Map"
        [1] = {java.lang.Class@307}"interface java.lang.Cloneable"
        [2] = {java.lang.Class@327}"interface java.io.Serializable"
        [3] = {java.lang.Class@322}"class java.util.AbstractMap"
    ser=com.fasterxml.jackson.databind.ser.std.MapSerializer@4dfe96f2
    public void serialize(Map<?,?> value, JsonGenerator jgen, SerializerProvider provider)
      com.fasterxml.jackson.core.json.WriterBasedJsonGenerator@449b9ad
      com.fasterxml.jackson.databind.ser.DefaultSerializerProvider$Impl@49271218
    com.fasterxml.jackson.databind.ser.std.MapSerializer#serializeFields
      keySerializer=com.fasterxml.jackson.databind.ser.std.StdKeySerializer@40c444cf
    com.fasterxml.jackson.databind.ser.std.StdKeySerializer#serialize
    com.fasterxml.jackson.core.json.WriterBasedJsonGenerator#writeFieldName(java.lang.String)
      com.fasterxml.jackson.core.json.JsonWriteContext#writeFieldName
          public final int writeFieldName(String name) throws JsonProcessingException
          {
              _gotName = true;
              _currentName = name;
              if (_dups != null) {
                  _checkDup(_dups, name);
              }
              return (_index < 0) ? STATUS_OK_AS_IS : STATUS_OK_AFTER_COMMA;
          }
      com.fasterxml.jackson.core.json.WriterBasedJsonGenerator#_writeFieldName(java.lang.String, boolean)
      com.fasterxml.jackson.core.json.WriterBasedJsonGenerator#_writeString(java.lang.String)
    com.fasterxml.jackson.databind.ser.std.MapSerializer#_findAndAddDynamic(com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap, java.lang.Class<?>, com.fasterxml.jackson.databind.SerializerProvider)
    com.fasterxml.jackson.databind.ser.std.NumberSerializers.IntegerSerializer#serialize
      com.fasterxml.jackson.core.json.WriterBasedJsonGenerator#writeNumber(int)
      com.fasterxml.jackson.core.io.NumberOutput#outputInt(int, char[], int)
    com.fasterxml.jackson.core.json.WriterBasedJsonGenerator#close
    

jackson-dataformat-smile

Map<String, Object> map = new HashMap<>();
map.put("name", "komamitsu");
map.put("age", 39);
SmileFactory factory = new SmileFactory();
ObjectMapper objectMapper = new ObjectMapper(factory);
byte[] serialized = objectMapper.writeValueAsBytes(map);
Map<String, Object> deserialized =
        objectMapper.readValue(serialized, new TypeReference<Map<String, Object>>() { });
System.out.println(deserialized);

com.fasterxml.jackson.databind.ObjectMapper#writeValueAsBytes
com.fasterxml.jackson.dataformat.smile.SmileFactory#createGenerator(java.io.OutputStream, com.fasterxml.jackson.core.JsonEncoding)
com.fasterxml.jackson.dataformat.smile.SmileFactory#_createGenerator(java.io.OutputStream, com.fasterxml.jackson.core.io.IOContext)
SmileGenerator gen = new SmileGenerator(ctxt, _generatorFeatures, feats, _objectCodec, out);
com.fasterxml.jackson.databind.ObjectMapper#_configAndWriteValue(com.fasterxml.jackson.core.JsonGenerator, java.lang.Object)
com.fasterxml.jackson.databind.ser.DefaultSerializerProvider#serializeValue(com.fasterxml.jackson.core.JsonGenerator, java.lang.Object)
com.fasterxml.jackson.databind.SerializerProvider#findTypedValueSerializer(java.lang.Class<?>, boolean, com.fasterxml.jackson.databind.BeanProperty)
com.fasterxml.jackson.databind.SerializerProvider#findValueSerializer(java.lang.Class<?>, com.fasterxml.jackson.databind.BeanProperty)
com.fasterxml.jackson.databind.SerializerProvider#_createAndCacheUntypedSerializer(java.lang.Class<?>)
com.fasterxml.jackson.databind.ser.std.MapSerializer#serialize
com.fasterxml.jackson.dataformat.smile.SmileGenerator#writeStartObject
    @Override
    public final void writeStartObject() throws IOException, JsonGenerationException
    {
        _verifyValueWrite("start an object");
        _writeContext = _writeContext.createChildObjectContext();
        _writeByte(TOKEN_LITERAL_START_OBJECT);
    }
com.fasterxml.jackson.databind.ser.std.MapSerializer#serializeFields
com.fasterxml.jackson.databind.ser.std.StdKeySerializer#serialize
com.fasterxml.jackson.dataformat.smile.SmileGenerator#writeFieldName(java.lang.String)
  com.fasterxml.jackson.core.json.JsonWriteContext#writeFieldName
  com.fasterxml.jackson.dataformat.smile.SmileGenerator#_writeFieldName(java.lang.String)
          int len = name.length();
          name.getChars(0, len, _charBuffer, 0);
com.fasterxml.jackson.databind.ser.std.MapSerializer#_findAndAddDynamic(com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap, java.lang.Class<?>, com.fasterxml.jackson.databind.SerializerProvider)
com.fasterxml.jackson.databind.ser.std.NumberSerializers.IntegerSerializer#serialize
com.fasterxml.jackson.dataformat.smile.SmileGenerator#writeNumber(int)
com.fasterxml.jackson.databind.ser.std.StringSerializer#serialize
com.fasterxml.jackson.dataformat.smile.SmileGenerator#writeString(java.lang.String)
com.fasterxml.jackson.dataformat.smile.SmileGenerator#close



com.fasterxml.jackson.databind.ObjectMapper#readValue(byte[], com.fasterxml.jackson.core.type.TypeReference)
com.fasterxml.jackson.dataformat.smile.SmileFactory#createParser(byte[])
com.fasterxml.jackson.core.JsonFactory#_createContext
com.fasterxml.jackson.dataformat.smile.SmileFactory#_createParser(byte[], int, int, com.fasterxml.jackson.core.io.IOContext)
com.fasterxml.jackson.databind.ObjectMapper#_readMapAndClose
com.fasterxml.jackson.databind.ObjectMapper#_initForReading
  com.fasterxml.jackson.core.base.ParserMinimalBase#getCurrentToken
  com.fasterxml.jackson.dataformat.smile.SmileParser#nextToken
  int ch = _inputBuffer[_inputPtr++];

    case 0x1A: // START_OBJECT
      _parsingContext = _parsingContext.createChildObjectContext(-1, -1);
      return (_currToken = JsonToken.START_OBJECT);
  com.fasterxml.jackson.core.json.JsonReadContext#createChildObjectContext
com.fasterxml.jackson.databind.deser.std.MapDeserializer#deserialize(com.fasterxml.jackson.core.JsonParser, com.fasterxml.jackson.databind.DeserializationContext)
com.fasterxml.jackson.core.base.ParserMinimalBase#getCurrentToken
com.fasterxml.jackson.databind.deser.std.MapDeserializer#_readAndBindStringMap
  com.fasterxml.jackson.core.base.ParserMinimalBase#getCurrentToken
  com.fasterxml.jackson.dataformat.smile.SmileParser#nextToken
  com.fasterxml.jackson.core.base.ParserBase#getCurrentName
  com.fasterxml.jackson.databind.deser.std.UntypedObjectDeserializer#deserialize
  com.fasterxml.jackson.core.base.ParserBase#getNumberValue
  com.fasterxml.jackson.dataformat.smile.SmileParser#_parseNumericValue

```
      # When did it call _parsingContext.setCurrentName(name)???
      com.fasterxml.jackson.dataformat.smile.SmileParser#_handleFieldName
      case 2: // short ASCII
	    {
	        int len = 1 + (ch & 0x3f);
        	String name;
        	Name n = _findDecodedFromSymbols(len);
        	if (n != null) {
        	    name = n.getName();
        	    _inputPtr += len;
        	} else {
        	    name = _decodeShortAsciiName(len);
        	    name = _addDecodedToSymbols(len, name);
        	}
                if (_seenNames != null) {
                   if (_seenNameCount >= _seenNames.length) {
   	               _seenNames = _expandSeenNames(_seenNames);
                   }
                   _seenNames[_seenNameCount++] = name;
                }
                _parsingContext.setCurrentName(name);
	    }
```