org.springframework.web.reactive.result.method

Class AbstractHandlerMethodMapping<T>

java.lang.Object

org.springframework.context.support.ApplicationObjectSupport

org.springframework.web.reactive.handler.AbstractHandlerMapping

org.springframework.web.reactive.result.method.AbstractHandlerMethodMapping<T>

Type Parameters:

T - The mapping for a HandlerMethod containing the conditions needed to match the handler method to incoming request.

All Implemented Interfaces:

Aware, InitializingBean, ApplicationContextAware, Ordered, HandlerMapping

Direct Known Subclasses:

RequestMappingInfoHandlerMapping

public abstract class AbstractHandlerMethodMapping<T>
extends AbstractHandlerMapping
implements InitializingBean

Abstract base class for HandlerMapping implementations that define a mapping between a request and a HandlerMethod.

For each registered handler method, a unique mapping is maintained with subclasses defining the details of the mapping type <T>.

Since:

5.0

Author:

Rossen Stoyanchev, Brian Clozel

Field Summary

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

logger

Fields inherited from interface org.springframework.web.reactive.HandlerMapping

BEST_MATCHING_HANDLER_ATTRIBUTE, BEST_MATCHING_PATTERN_ATTRIBUTE, MATRIX_VARIABLES_ATTRIBUTE, PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE, URI_TEMPLATE_VARIABLES_ATTRIBUTE

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor and Description
AbstractHandlerMethodMapping()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Detects handler methods at initialization.
protected HandlerMethod	createHandlerMethod(Object handler, Method method) Create the HandlerMethod instance.
protected void	detectHandlerMethods(Object handler) Look for handler methods in a handler.
protected CorsConfiguration	getCorsConfiguration(Object handler, ServerWebExchange exchange) Retrieve the CORS configuration for the given handler.
reactor.core.publisher.Mono<HandlerMethod>	getHandlerInternal(ServerWebExchange exchange) Look up a handler method for the given request.
Map<T,HandlerMethod>	getHandlerMethods() Return a (read-only) map with all mappings and HandlerMethod's.
protected abstract Comparator<T>	getMappingComparator(ServerWebExchange exchange) Return a comparator for sorting matching mappings.
protected abstract T	getMappingForMethod(Method method, Class<?> handlerType) Provide the mapping for a handler method.
protected abstract T	getMatchingMapping(T mapping, ServerWebExchange exchange) Check if a mapping matches the current request and return a (potentially new) mapping with conditions relevant to the current request.
protected void	handleMatch(T mapping, HandlerMethod handlerMethod, ServerWebExchange exchange) Invoked when a matching mapping is found.
protected HandlerMethod	handleNoMatch(Set<T> mappings, ServerWebExchange exchange) Invoked when no matching mapping is not found.
protected void	handlerMethodsInitialized(Map<T,HandlerMethod> handlerMethods) Invoked after all handler methods have been detected.
protected CorsConfiguration	initCorsConfiguration(Object handler, Method method, T mapping) Extract and return the CORS configuration for the mapping.
protected void	initHandlerMethods() Scan beans in the ApplicationContext, detect and register handler methods.
protected abstract boolean	isHandler(Class<?> beanType) Whether the given type is a handler with handler methods.
protected HandlerMethod	lookupHandlerMethod(ServerWebExchange exchange) Look up the best-matching handler method for the current request.
protected void	registerHandlerMethod(Object handler, Method method, T mapping) Register a handler method and its unique mapping.
void	registerMapping(T mapping, Object handler, Method method) Register the given mapping.
void	unregisterMapping(T mapping) Un-register the given mapping.

Methods inherited from class org.springframework.web.reactive.handler.AbstractHandlerMapping

getCorsProcessor, getHandler, getOrder, getPathPatternParser, setCorsConfigurations, setCorsProcessor, setOrder, setUseCaseSensitiveMatch, setUseTrailingSlashMatch

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

getApplicationContext, getMessageSourceAccessor, initApplicationContext, initApplicationContext, isContextRequired, obtainApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractHandlerMethodMapping

public AbstractHandlerMethodMapping()

Method Detail

getHandlerMethods

public Map<T,HandlerMethod> getHandlerMethods()

Return a (read-only) map with all mappings and HandlerMethod's.

registerMapping

public void registerMapping(T mapping,
                            Object handler,
                            Method method)

Register the given mapping.

This method may be invoked at runtime after initialization has completed.

Parameters:

mapping - the mapping for the handler method

handler - the handler

method - the method

unregisterMapping

public void unregisterMapping(T mapping)

Un-register the given mapping.

This method may be invoked at runtime after initialization has completed.

Parameters:

mapping - the mapping to unregister

afterPropertiesSet

public void afterPropertiesSet()

Detects handler methods at initialization.

Specified by:

afterPropertiesSet in interface InitializingBean

initHandlerMethods

protected void initHandlerMethods()

Scan beans in the ApplicationContext, detect and register handler methods.

See Also:

isHandler(Class), getMappingForMethod(Method, Class), handlerMethodsInitialized(Map)

detectHandlerMethods

protected void detectHandlerMethods(Object handler)

Look for handler methods in a handler.

Parameters:

handler - the bean name of a handler or a handler instance

registerHandlerMethod

protected void registerHandlerMethod(Object handler,
                                     Method method,
                                     T mapping)

Register a handler method and its unique mapping. Invoked at startup for each detected handler method.

Parameters:

handler - the bean name of the handler or the handler instance

method - the method to register

mapping - the mapping conditions associated with the handler method

Throws:

IllegalStateException - if another method was already registered under the same mapping

createHandlerMethod

protected HandlerMethod createHandlerMethod(Object handler,
                                            Method method)

Create the HandlerMethod instance.

Parameters:

handler - either a bean name or an actual handler instance

method - the target method

Returns:

the created HandlerMethod

initCorsConfiguration

@Nullable
protected CorsConfiguration initCorsConfiguration(Object handler,
                                                            Method method,
                                                            T mapping)

Extract and return the CORS configuration for the mapping.

handlerMethodsInitialized

protected void handlerMethodsInitialized(Map<T,HandlerMethod> handlerMethods)

Invoked after all handler methods have been detected.

Parameters:

handlerMethods - a read-only map with handler methods and mappings.

getHandlerInternal

public reactor.core.publisher.Mono<HandlerMethod> getHandlerInternal(ServerWebExchange exchange)

Look up a handler method for the given request.

Specified by:

getHandlerInternal in class AbstractHandlerMapping

Parameters:

exchange - the current exchange

Returns:

Mono for the matching handler, if any

lookupHandlerMethod

@Nullable
protected HandlerMethod lookupHandlerMethod(ServerWebExchange exchange)
                                               throws Exception

Look up the best-matching handler method for the current request. If multiple matches are found, the best match is selected.

Parameters:

exchange - the current exchange

Returns:

the best-matching handler method, or null if no match

Throws:

Exception

See Also:

handleMatch(T, org.springframework.web.method.HandlerMethod, org.springframework.web.server.ServerWebExchange), handleNoMatch(java.util.Set<T>, org.springframework.web.server.ServerWebExchange)

handleMatch

protected void handleMatch(T mapping,
                           HandlerMethod handlerMethod,
                           ServerWebExchange exchange)

Invoked when a matching mapping is found.

Parameters:

mapping - the matching mapping

handlerMethod - the matching method

exchange - the current exchange

handleNoMatch

@Nullable
protected HandlerMethod handleNoMatch(Set<T> mappings,
                                                ServerWebExchange exchange)
                                         throws Exception

Invoked when no matching mapping is not found.

Parameters:

mappings - all registered mappings

exchange - the current exchange

Returns:

an alternative HandlerMethod or null

Throws:

Exception - provides details that can be translated into an error status code

getCorsConfiguration

protected CorsConfiguration getCorsConfiguration(Object handler,
                                                 ServerWebExchange exchange)

Description copied from class: AbstractHandlerMapping

Retrieve the CORS configuration for the given handler.

Overrides:

getCorsConfiguration in class AbstractHandlerMapping

Parameters:

handler - the handler to check (never null)

exchange - the current exchange

Returns:

the CORS configuration for the handler, or null if none

isHandler

protected abstract boolean isHandler(Class<?> beanType)

Whether the given type is a handler with handler methods.

Parameters:

beanType - the type of the bean being checked

Returns:

"true" if this a handler type, "false" otherwise.

getMappingForMethod

@Nullable
protected abstract T getMappingForMethod(Method method,
                                                   Class<?> handlerType)

Provide the mapping for a handler method. A method for which no mapping can be provided is not a handler method.

Parameters:

method - the method to provide a mapping for

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

getMatchingMapping

@Nullable
protected abstract T getMatchingMapping(T mapping,
                                                  ServerWebExchange exchange)

Check if a mapping matches the current request and return a (potentially new) mapping with conditions relevant to the current request.

Parameters:

mapping - the mapping to get a match for

exchange - the current exchange

Returns:

the match, or null if the mapping doesn't match

getMappingComparator

protected abstract Comparator<T> getMappingComparator(ServerWebExchange exchange)

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

Parameters:

exchange - the current exchange

Returns:

the comparator (never null)