Package org.springframework.messaging.handler.annotation.reactive

Class MessageMappingMessageHandler

java.lang.Object

org.springframework.messaging.handler.invocation.reactive.AbstractMethodMessageHandler<CompositeMessageCondition>

org.springframework.messaging.handler.annotation.reactive.MessageMappingMessageHandler

All Implemented Interfaces:

Aware, BeanNameAware, InitializingBean, ApplicationContextAware, EmbeddedValueResolverAware, ReactiveMessageHandler

Direct Known Subclasses:

RSocketMessageHandler

public class MessageMappingMessageHandler
extends AbstractMethodMessageHandler<CompositeMessageCondition>
implements EmbeddedValueResolverAware

Extension of AbstractMethodMessageHandler for reactive, non-blocking handling of messages via @MessageMapping methods. By default such methods are detected in @Controller Spring beans but that can be changed via AbstractMethodMessageHandler.setHandlerPredicate(Predicate).

Payloads for incoming messages are decoded through the configured setDecoders(List) decoders, with the help of PayloadMethodArgumentResolver.

There is no default handling for return values but AbstractMethodMessageHandler.setReturnValueHandlerConfigurer(org.springframework.messaging.handler.invocation.reactive.ReturnValueHandlerConfigurer) can be used to configure custom return value handlers. Sub-classes may also override initReturnValueHandlers() to set up default return value handlers.

Since:

5.2

Author:

Rossen Stoyanchev

See Also:

• AbstractEncoderMethodReturnValueHandler

Field Summary

Fields inherited from class org.springframework.messaging.handler.invocation.reactive.AbstractMethodMessageHandler

logger

Constructor Summary

Constructors

Constructor	Description
MessageMappingMessageHandler()

Method Summary

Modifier and Type	Method	Description
void	afterPropertiesSet()	Invoked by the containing BeanFactory after it has set all bean properties and satisfied BeanFactoryAware, ApplicationContextAware etc.
protected AbstractExceptionHandlerMethodResolver	createExceptionMethodResolverFor(Class<?> beanType)	Create a concrete instance of AbstractExceptionHandlerMethodResolver that finds exception handling methods based on some criteria, e.g.
protected CompositeMessageCondition	getCondition(AnnotatedElement element)	Determine the mapping condition for the given annotated element.
ConversionService	getConversionService()	Return the configured ConversionService.
List<? extends Decoder<?>>	getDecoders()	Return the configured decoders.
protected RouteMatcher.Route	getDestination(Message<?> message)	Extract the destination from the given message.
protected Set<String>	getDirectLookupMappings(CompositeMessageCondition mapping)	Return String-based destinations for the given mapping, if any, that can be used to find matches with a direct lookup (i.e.
protected Comparator<CompositeMessageCondition>	getMappingComparator(Message<?> message)	Return a comparator for sorting matching mappings.
protected CompositeMessageCondition	getMappingForMethod(Method method, Class<?> handlerType)	Obtain the mapping for the given method, if any.
protected CompositeMessageCondition	getMatchingMapping(CompositeMessageCondition mapping, Message<?> message)	Check if a mapping matches the current message and return a possibly new mapping with conditions relevant to the current request.
RouteMatcher	getRouteMatcher()	Return the RouteMatcher used to map messages to handlers.
Validator	getValidator()	Return the configured Validator instance.
protected reactor.core.publisher.Mono<Void>	handleMatch(CompositeMessageCondition mapping, HandlerMethod handlerMethod, Message<?> message)
protected List<? extends HandlerMethodArgumentResolver>	initArgumentResolvers()	Return the list of argument resolvers to use.
protected List<? extends HandlerMethodReturnValueHandler>	initReturnValueHandlers()	Return the list of return value handlers to use.
protected RouteMatcher	obtainRouteMatcher()	Obtain the RouteMatcher for actual use.
protected String[]	processDestinations(String[] destinations)	Resolve placeholders in the given destinations.
void	registerMessagingAdvice(MessagingAdviceBean bean)	Use this method to register a MessagingAdviceBean that may contain globally applicable @MessageExceptionHandler methods.
void	setConversionService(ConversionService conversionService)	Configure a ConversionService to use for type conversion of String based values, e.g.
void	setDecoders(List<? extends Decoder<?>> decoders)	Configure the decoders to use for incoming payloads.
void	setEmbeddedValueResolver(StringValueResolver resolver)	Set the StringValueResolver to use for resolving embedded definition values.
void	setRouteMatcher(RouteMatcher routeMatcher)	Set the RouteMatcher to use for mapping messages to handlers based on the route patterns they're configured with.
void	setValidator(Validator validator)	Set the Validator instance used for validating @Payload arguments.

Methods inherited from class org.springframework.messaging.handler.invocation.reactive.AbstractMethodMessageHandler

detectHandlerMethods, extendMapping, getApplicationContext, getArgumentResolverConfigurer, getArgumentResolvers, getBeanName, getDestinationLookup, getHandlerMethods, getHandlerPredicate, getReactiveAdapterRegistry, getReturnValueHandlerConfigurer, handleMessage, handleNoMatch, registerExceptionHandlerAdvice, registerHandlerMethod, setApplicationContext, setArgumentResolverConfigurer, setBeanName, setHandlerPredicate, setHandlers, setReactiveAdapterRegistry, setReturnValueHandlerConfigurer

Methods inherited from class java.lang.Object

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

Constructor Details

MessageMappingMessageHandler

public MessageMappingMessageHandler()

Method Details

setDecoders

public void setDecoders(List<? extends Decoder<?>> decoders)

Configure the decoders to use for incoming payloads.

getDecoders

public List<? extends Decoder<?>> getDecoders()

Return the configured decoders.

setValidator

public void setValidator(@Nullable
 Validator validator)

Set the Validator instance used for validating @Payload arguments.

See Also:

• Validated
• PayloadMethodArgumentResolver

getValidator

@Nullable
public Validator getValidator()

Return the configured Validator instance.

setRouteMatcher

public void setRouteMatcher(@Nullable
 RouteMatcher routeMatcher)

Set the RouteMatcher to use for mapping messages to handlers based on the route patterns they're configured with.

By default, SimpleRouteMatcher is used, backed by AntPathMatcher with "." as separator. For greater efficiency consider using the PathPatternRouteMatcher from spring-web instead.

getRouteMatcher

@Nullable
public RouteMatcher getRouteMatcher()

Return the RouteMatcher used to map messages to handlers. May be null before the component is initialized.

obtainRouteMatcher

protected RouteMatcher obtainRouteMatcher()

Obtain the RouteMatcher for actual use.

Returns:

the RouteMatcher (never null)

Throws:

IllegalStateException - in case of no RouteMatcher set

Since:

5.0

setConversionService

public void setConversionService(ConversionService conversionService)

Configure a ConversionService to use for type conversion of String based values, e.g. in destination variables or headers.

By default DefaultFormattingConversionService is used.

Parameters:

conversionService - the conversion service to use

getConversionService

public ConversionService getConversionService()

Return the configured ConversionService.

setEmbeddedValueResolver

public void setEmbeddedValueResolver(StringValueResolver resolver)

Description copied from interface: EmbeddedValueResolverAware

Set the StringValueResolver to use for resolving embedded definition values.

Specified by:

setEmbeddedValueResolver in interface EmbeddedValueResolverAware

registerMessagingAdvice

public void registerMessagingAdvice(MessagingAdviceBean bean)

Use this method to register a MessagingAdviceBean that may contain globally applicable @MessageExceptionHandler methods.

Note: spring-messaging does not depend on spring-web and therefore it is not possible to explicitly support the registration of a @ControllerAdvice bean. You can use the following adapter code to register @ControllerAdvice beans here:

 ControllerAdviceBean.findAnnotatedBeans(context).forEach(bean ->
         messageHandler.registerMessagingAdvice(new ControllerAdviceWrapper(bean));

 public class ControllerAdviceWrapper implements MessagingAdviceBean {
     private final ControllerAdviceBean delegate;
     // delegate all methods
 }
 

Parameters:

bean - the bean to check for @MessageExceptionHandler methods

Since:

5.3.5

afterPropertiesSet

public void afterPropertiesSet()

Description copied from interface: InitializingBean

Invoked by the containing BeanFactory after it has set all bean properties and satisfied BeanFactoryAware, ApplicationContextAware etc.

This method allows the bean instance to perform validation of its overall configuration and final initialization when all bean properties have been set.

Specified by:

afterPropertiesSet in interface InitializingBean

Overrides:

afterPropertiesSet in class AbstractMethodMessageHandler<CompositeMessageCondition>

initArgumentResolvers

protected List<? extends HandlerMethodArgumentResolver> initArgumentResolvers()

Description copied from class: AbstractMethodMessageHandler

Return the list of argument resolvers to use.

Subclasses should also take into account custom argument types configured via AbstractMethodMessageHandler.setArgumentResolverConfigurer(org.springframework.messaging.handler.invocation.reactive.ArgumentResolverConfigurer).

Specified by:

initArgumentResolvers in class AbstractMethodMessageHandler<CompositeMessageCondition>

initReturnValueHandlers

protected List<? extends HandlerMethodReturnValueHandler> initReturnValueHandlers()

Description copied from class: AbstractMethodMessageHandler

Return the list of return value handlers to use.

Subclasses should also take into account custom return value types configured via AbstractMethodMessageHandler.setReturnValueHandlerConfigurer(org.springframework.messaging.handler.invocation.reactive.ReturnValueHandlerConfigurer).

Specified by:

initReturnValueHandlers in class AbstractMethodMessageHandler<CompositeMessageCondition>

getMappingForMethod

protected CompositeMessageCondition getMappingForMethod(Method method,
 Class<?> handlerType)

Description copied from class: AbstractMethodMessageHandler

Obtain the mapping for the given method, if any.

Specified by:

getMappingForMethod in class AbstractMethodMessageHandler<CompositeMessageCondition>

Parameters:

method - the method to check

handlerType - the handler type, possibly a sub-type of the method's declaring class

Returns:

the mapping, or null if the method is not mapped

getCondition

@Nullable
protected CompositeMessageCondition getCondition(AnnotatedElement element)

Determine the mapping condition for the given annotated element.

Parameters:

element - the element to check

Returns:

the condition, or null

processDestinations

protected String[] processDestinations(String[] destinations)

Resolve placeholders in the given destinations.

Parameters:

destinations - the destinations

Returns:

new array with the processed destinations or the same array

getDirectLookupMappings

protected Set<String> getDirectLookupMappings(CompositeMessageCondition mapping)

Description copied from class: AbstractMethodMessageHandler

Return String-based destinations for the given mapping, if any, that can be used to find matches with a direct lookup (i.e. non-patterns).

Note: This is completely optional. The mapping metadata for a subclass may support neither direct lookups, nor String based destinations.

Specified by:

getDirectLookupMappings in class AbstractMethodMessageHandler<CompositeMessageCondition>

getDestination

protected RouteMatcher.Route getDestination(Message<?> message)

Description copied from class: AbstractMethodMessageHandler

Extract the destination from the given message.

Specified by:

getDestination in class AbstractMethodMessageHandler<CompositeMessageCondition>

See Also:

• AbstractMethodMessageHandler.getDirectLookupMappings(Object)

getMatchingMapping

protected CompositeMessageCondition getMatchingMapping(CompositeMessageCondition mapping,
 Message<?> message)

Description copied from class: AbstractMethodMessageHandler

Check if a mapping matches the current message and return a possibly new mapping with conditions relevant to the current request.

Specified by:

getMatchingMapping in class AbstractMethodMessageHandler<CompositeMessageCondition>

Parameters:

mapping - the mapping to get a match for

message - the message being handled

Returns:

the match or null if there is no match

getMappingComparator

protected Comparator<CompositeMessageCondition> getMappingComparator(Message<?> message)

Description copied from class: AbstractMethodMessageHandler

Return a comparator for sorting matching mappings. The returned comparator should sort 'better' matches higher.

Specified by:

getMappingComparator in class AbstractMethodMessageHandler<CompositeMessageCondition>

Parameters:

message - the current Message

Returns:

the comparator, never null

createExceptionMethodResolverFor

protected AbstractExceptionHandlerMethodResolver createExceptionMethodResolverFor(Class<?> beanType)

Description copied from class: AbstractMethodMessageHandler

Create a concrete instance of AbstractExceptionHandlerMethodResolver that finds exception handling methods based on some criteria, e.g. based on the presence of @MessageExceptionHandler.

Specified by:

createExceptionMethodResolverFor in class AbstractMethodMessageHandler<CompositeMessageCondition>

Parameters:

beanType - the class in which an exception occurred during handling

Returns:

the resolver to use

handleMatch

protected reactor.core.publisher.Mono<Void> handleMatch(CompositeMessageCondition mapping,
 HandlerMethod handlerMethod,
 Message<?> message)

Overrides:

handleMatch in class AbstractMethodMessageHandler<CompositeMessageCondition>