org.springframework.jms.support.converter

Class MappingJackson2MessageConverter

java.lang.Object

org.springframework.jms.support.converter.MappingJackson2MessageConverter

All Implemented Interfaces:

Aware, BeanClassLoaderAware, MessageConverter

public class MappingJackson2MessageConverter
extends java.lang.Object
implements MessageConverter, BeanClassLoaderAware

Message converter that uses the Jackson 2 library to convert messages to and from JSON. Maps an object to a BytesMessage, or to a TextMessage if the targetType is set to MessageType.TEXT. Converts from a TextMessage or BytesMessage to an object.

Since:

3.1.4

Author:

Mark Pollack, Dave Syer, Juergen Hoeller

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.ClassLoader	beanClassLoader
private java.util.Map<java.lang.Class<?>,java.lang.String>	classIdMappings
static java.lang.String	DEFAULT_ENCODING The default encoding used for writing to text messages: UTF-8.
private java.lang.String	encoding
private java.lang.String	encodingPropertyName
private java.util.Map<java.lang.String,java.lang.Class<?>>	idClassMappings
private ObjectMapper	objectMapper
private MessageType	targetType
private java.lang.String	typeIdPropertyName

Constructor Summary

Constructors

Constructor and Description
MappingJackson2MessageConverter()

Method Summary

Modifier and Type	Method and Description
protected java.lang.Object	convertFromBytesMessage(BytesMessage message, JavaType targetJavaType) Convert a BytesMessage to a Java Object with the specified type.
protected java.lang.Object	convertFromMessage(Message message, JavaType targetJavaType) Template method that allows for custom message mapping.
protected java.lang.Object	convertFromTextMessage(TextMessage message, JavaType targetJavaType) Convert a TextMessage to a Java Object with the specified type.
private java.lang.Object	convertToObject(Message message, JavaType targetJavaType) Convenience method to dispatch to converters for individual message types.
java.lang.Object	fromMessage(Message message) Convert from a JMS Message to a Java object.
protected JavaType	getJavaTypeForMessage(Message message) Determine a Jackson JavaType for the given JMS Message, typically parsing a type id message property.
protected BytesMessage	mapToBytesMessage(java.lang.Object object, Session session, ObjectMapper objectMapper) Map the given object to a BytesMessage.
protected Message	mapToMessage(java.lang.Object object, Session session, ObjectMapper objectMapper, MessageType targetType) Template method that allows for custom message mapping.
protected TextMessage	mapToTextMessage(java.lang.Object object, Session session, ObjectMapper objectMapper) Map the given object to a TextMessage.
void	setBeanClassLoader(java.lang.ClassLoader classLoader) Callback that supplies the bean <code>class loader</code> to a bean instance.
void	setEncoding(java.lang.String encoding) Specify the encoding to use when converting to and from text-based message body content.
void	setEncodingPropertyName(java.lang.String encodingPropertyName) Specify the name of the JMS message property that carries the encoding from bytes to String and back is BytesMessage is used during the conversion process.
void	setObjectMapper(ObjectMapper objectMapper) Specify the ObjectMapper to use instead of using the default.
void	setTargetType(MessageType targetType) Specify whether toMessage(Object, Session) should marshal to a BytesMessage or a TextMessage.
void	setTypeIdMappings(java.util.Map<java.lang.String,java.lang.Class<?>> typeIdMappings) Specify mappings from type ids to Java classes, if desired.
protected void	setTypeIdOnMessage(java.lang.Object object, Message message) Set a type id for the given payload object on the given JMS Message.
void	setTypeIdPropertyName(java.lang.String typeIdPropertyName) Specify the name of the JMS message property that carries the type id for the contained object: either a mapped id value or a raw Java class name.
Message	toMessage(java.lang.Object object, Session session) Convert a Java object to a JMS Message using the supplied session to create the message object.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_ENCODING

public static final java.lang.String DEFAULT_ENCODING

The default encoding used for writing to text messages: UTF-8.

See Also:

Constant Field Values

objectMapper

private ObjectMapper objectMapper

targetType

private MessageType targetType

encoding

private java.lang.String encoding

encodingPropertyName

private java.lang.String encodingPropertyName

typeIdPropertyName

private java.lang.String typeIdPropertyName

idClassMappings

private java.util.Map<java.lang.String,java.lang.Class<?>> idClassMappings

classIdMappings

private java.util.Map<java.lang.Class<?>,java.lang.String> classIdMappings

beanClassLoader

private java.lang.ClassLoader beanClassLoader

Constructor Detail

MappingJackson2MessageConverter

public MappingJackson2MessageConverter()

Method Detail

setObjectMapper

public void setObjectMapper(ObjectMapper objectMapper)

Specify the ObjectMapper to use instead of using the default.

setTargetType

public void setTargetType(MessageType targetType)

Specify whether toMessage(Object, Session) should marshal to a BytesMessage or a TextMessage.

The default is MessageType.BYTES, i.e. this converter marshals to a BytesMessage. Note that the default version of this converter supports MessageType.BYTES and MessageType.TEXT only.

See Also:

MessageType.BYTES, MessageType.TEXT

setEncoding

public void setEncoding(java.lang.String encoding)

Specify the encoding to use when converting to and from text-based message body content. The default encoding will be "UTF-8".

When reading from a a text-based message, an encoding may have been suggested through a special JMS property which will then be preferred over the encoding set on this MessageConverter instance.

See Also:

setEncodingPropertyName(java.lang.String)

setEncodingPropertyName

public void setEncodingPropertyName(java.lang.String encodingPropertyName)

Specify the name of the JMS message property that carries the encoding from bytes to String and back is BytesMessage is used during the conversion process.

Default is none. Setting this property is optional; if not set, UTF-8 will be used for decoding any incoming bytes message.

See Also:

setEncoding(java.lang.String)

setTypeIdPropertyName

public void setTypeIdPropertyName(java.lang.String typeIdPropertyName)

Specify the name of the JMS message property that carries the type id for the contained object: either a mapped id value or a raw Java class name.

Default is none. NOTE: This property needs to be set in order to allow for converting from an incoming message to a Java object.

See Also:

setTypeIdMappings(java.util.Map<java.lang.String, java.lang.Class<?>>)

setTypeIdMappings

public void setTypeIdMappings(java.util.Map<java.lang.String,java.lang.Class<?>> typeIdMappings)

Specify mappings from type ids to Java classes, if desired. This allows for synthetic ids in the type id message property, instead of transferring Java class names.

Default is no custom mappings, i.e. transferring raw Java class names.

Parameters:

typeIdMappings - a Map with type id values as keys and Java classes as values

setBeanClassLoader

public void setBeanClassLoader(java.lang.ClassLoader classLoader)

Description copied from interface: BeanClassLoaderAware

Callback that supplies the bean <code>class loader</code> to a bean instance.

Invoked after the population of normal bean properties but before an initialization callback such as InitializingBean's InitializingBean.afterPropertiesSet() method or a custom init-method.

Specified by:

setBeanClassLoader in interface BeanClassLoaderAware

Parameters:

classLoader - the owning class loader; may be null in which case a default ClassLoader must be used, for example the ClassLoader obtained via ClassUtils.getDefaultClassLoader()

toMessage

public Message toMessage(java.lang.Object object,
                         Session session)
                  throws JMSException,
                         MessageConversionException

Description copied from interface: MessageConverter

Convert a Java object to a JMS Message using the supplied session to create the message object.

Specified by:

toMessage in interface MessageConverter

Parameters:

object - the object to convert

session - the Session to use for creating a JMS Message

Returns:

the JMS Message

Throws:

MessageConversionException - in case of conversion failure

JMSException

fromMessage

public java.lang.Object fromMessage(Message message)
                             throws JMSException,
                                    MessageConversionException

Description copied from interface: MessageConverter

Convert from a JMS Message to a Java object.

Specified by:

fromMessage in interface MessageConverter

Parameters:

message - the message to convert

Returns:

the converted Java object

Throws:

MessageConversionException - in case of conversion failure

JMSException

mapToTextMessage

protected TextMessage mapToTextMessage(java.lang.Object object,
                                       Session session,
                                       ObjectMapper objectMapper)
                                throws JMSException,
                                       java.io.IOException

Map the given object to a TextMessage.

Parameters:

object - the object to be mapped

session - current JMS session

objectMapper - the mapper to use

Returns:

the resulting message

Throws:

JMSException - if thrown by JMS methods

java.io.IOException - in case of I/O errors

See Also:

Session#createBytesMessage

mapToBytesMessage

protected BytesMessage mapToBytesMessage(java.lang.Object object,
                                         Session session,
                                         ObjectMapper objectMapper)
                                  throws JMSException,
                                         java.io.IOException

Map the given object to a BytesMessage.

Parameters:

object - the object to be mapped

session - current JMS session

objectMapper - the mapper to use

Returns:

the resulting message

Throws:

JMSException - if thrown by JMS methods

java.io.IOException - in case of I/O errors

See Also:

Session#createBytesMessage

mapToMessage

protected Message mapToMessage(java.lang.Object object,
                               Session session,
                               ObjectMapper objectMapper,
                               MessageType targetType)
                        throws JMSException,
                               java.io.IOException

Template method that allows for custom message mapping. Invoked when setTargetType(org.springframework.jms.support.converter.MessageType) is not MessageType.TEXT or MessageType.BYTES.

The default implementation throws an <code>IllegalArgumentException</code>.

Parameters:

object - the object to marshal

session - the JMS Session

objectMapper - the mapper to use

targetType - the target message type (other than TEXT or BYTES)

Returns:

the resulting message

Throws:

JMSException - if thrown by JMS methods

java.io.IOException - in case of I/O errors

setTypeIdOnMessage

protected void setTypeIdOnMessage(java.lang.Object object,
                                  Message message)
                           throws JMSException

Set a type id for the given payload object on the given JMS Message.

The default implementation consults the configured type id mapping and sets the resulting value (either a mapped id or the raw Java class name) into the configured type id message property.

Parameters:

object - the payload object to set a type id for

message - the JMS Message to set the type id on

Throws:

JMSException - if thrown by JMS methods

See Also:

#getJavaTypeForMessage(javax.jms.Message), setTypeIdPropertyName(String), setTypeIdMappings(java.util.Map)

convertToObject

private java.lang.Object convertToObject(Message message,
                                         JavaType targetJavaType)
                                  throws JMSException,
                                         java.io.IOException

Convenience method to dispatch to converters for individual message types.

Throws:

JMSException

java.io.IOException

convertFromTextMessage

protected java.lang.Object convertFromTextMessage(TextMessage message,
                                                  JavaType targetJavaType)
                                           throws JMSException,
                                                  java.io.IOException

Convert a TextMessage to a Java Object with the specified type.

Parameters:

message - the input message

targetJavaType - the target type

Returns:

the message converted to an object

Throws:

JMSException - if thrown by JMS

java.io.IOException - in case of I/O errors

convertFromBytesMessage

protected java.lang.Object convertFromBytesMessage(BytesMessage message,
                                                   JavaType targetJavaType)
                                            throws JMSException,
                                                   java.io.IOException

Convert a BytesMessage to a Java Object with the specified type.

Parameters:

message - the input message

targetJavaType - the target type

Returns:

the message converted to an object

Throws:

JMSException - if thrown by JMS

java.io.IOException - in case of I/O errors

convertFromMessage

protected java.lang.Object convertFromMessage(Message message,
                                              JavaType targetJavaType)
                                       throws JMSException,
                                              java.io.IOException

Template method that allows for custom message mapping. Invoked when setTargetType(org.springframework.jms.support.converter.MessageType) is not MessageType.TEXT or MessageType.BYTES.

The default implementation throws an <code>IllegalArgumentException</code>.

Parameters:

message - the input message

targetJavaType - the target type

Returns:

the message converted to an object

Throws:

JMSException - if thrown by JMS

java.io.IOException - in case of I/O errors

getJavaTypeForMessage

protected JavaType getJavaTypeForMessage(Message message)
                                  throws JMSException

Determine a Jackson JavaType for the given JMS Message, typically parsing a type id message property.

The default implementation parses the configured type id property name and consults the configured type id mapping. This can be overridden with a different strategy, e.g. doing some heuristics based on message origin.

Parameters:

message - the JMS Message to set the type id on

Throws:

JMSException - if thrown by JMS methods

See Also:

#setTypeIdOnMessage(Object, javax.jms.Message), setTypeIdPropertyName(String), setTypeIdMappings(java.util.Map)