metricapp.utility

Class JacksonMapper

java.lang.Object

metricapp.utility.JacksonMapper

@Service(value="JacksonMapper")
public class JacksonMapper
extends java.lang.Object

This class is a utility, wired with Spring, that offers a lightweight converter for object to json string, and viceversa According to Jackson Documentation max performance of massive multithread use of mapper could be reached only with the separated use of writer and reader.

Jackson Documentation permits to use mapper with a single instance, it is ThreadSafe: from Jackson Doc... "ObjectReader/ObjectWriter: these are light-weight immutable objects that can be safely shared between threads (and thus reused) as well"

Example of use: jacksonMapper.toJson(myDTO) = return String of Json

Field Summary

Fields

Modifier and Type	Field and Description
private com.fasterxml.jackson.databind.ObjectMapper	mapper
private com.fasterxml.jackson.databind.ObjectWriter	writer

Constructor Summary

Constructors

Constructor and Description
JacksonMapper()

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	fromJson(java.lang.String json, java.lang.Class<T> myClass) Easier function to convert a string json to object
<T> com.fasterxml.jackson.databind.ObjectReader	getReader(java.lang.Class<T> myClass) this method return a ready to operate reader, it is customized for class.
private void	initialize() this method is the Spring implementation of Singleton.
java.lang.String	toJson(java.lang.Object object) this method is a simple wrapper of writeValueAsString of writer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mapper

private com.fasterxml.jackson.databind.ObjectMapper mapper

writer

private com.fasterxml.jackson.databind.ObjectWriter writer

Constructor Detail

JacksonMapper

public JacksonMapper()

Method Detail

initialize

@Autowired
private void initialize()

this method is the Spring implementation of Singleton. According to Jackson Documentation max performance of massive multithread use of mapper could be reached only with the separated use of writer and reader. Jackson Documentation permits to use mapper with a single instance, it is ThreadSafe

toJson

public java.lang.String toJson(java.lang.Object object)
                        throws com.fasterxml.jackson.core.JsonProcessingException

this method is a simple wrapper of writeValueAsString of writer.

Example of use: jacksonMapper.toJson(myDTO) = return String of Json

Parameters:

object - that you want to convert

Returns:

String json formatted

Throws:

com.fasterxml.jackson.core.JsonProcessingException

getReader

public <T> com.fasterxml.jackson.databind.ObjectReader getReader(java.lang.Class<T> myClass)

this method return a ready to operate reader, it is customized for class. It's easier to use function fromJson

Parameters:

myClass -

Returns:

a Reader Object

fromJson

public <T> T fromJson(java.lang.String json,
             java.lang.Class<T> myClass)
           throws java.io.IOException

Easier function to convert a string json to object

Parameters:

json - String of json

myClass - this is the class of destination of the mapping

Returns:

no cast needed, we do it for you.

Throws:

java.io.IOException - if the conversion failed