org.springframework.web.reactive.handler

Class AbstractUrlHandlerMapping

java.lang.Object

org.springframework.context.support.ApplicationObjectSupport

org.springframework.web.reactive.handler.AbstractHandlerMapping

org.springframework.web.reactive.handler.AbstractUrlHandlerMapping

All Implemented Interfaces:

Aware, BeanNameAware, ApplicationContextAware, Ordered, HandlerMapping

Direct Known Subclasses:

SimpleUrlHandlerMapping

public abstract class AbstractUrlHandlerMapping
extends AbstractHandlerMapping

Abstract base class for URL-mapped HandlerMapping implementations.

Supports direct matches, e.g. a registered "/test" matches "/test", and various path pattern matches, e.g. a registered "/t*" pattern matches both "/test" and "/team", "/test/*" matches all paths under "/test", "/test/**" matches all paths below "/test". For details, see the PathPattern javadoc.

Will search all path patterns to find the most specific match for the current request path. The most specific pattern is defined as the longest path pattern with the fewest captured variables and wildcards.

Since:

5.0

Author:

Rossen Stoyanchev, Juergen Hoeller, Brian Clozel

Field Summary

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

mappingsLogger

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
AbstractUrlHandlerMapping()

Method Summary

Modifier and Type	Method and Description
reactor.core.publisher.Mono<Object>	getHandlerInternal(ServerWebExchange exchange) Look up a handler for the given request, returning an empty Mono if no specific one is found.
Map<PathPattern,Object>	getHandlerMap() Return a read-only view of registered path patterns and handlers which may may be an actual handler instance or the bean name of lazily initialized handler.
protected Object	lookupHandler(PathContainer lookupPath, ServerWebExchange exchange) Look up a handler instance for the given URL lookup path.
protected void	registerHandler(String[] urlPaths, String beanName) Register the specified handler for the given URL paths.
protected void	registerHandler(String urlPath, Object handler) Register the specified handler for the given URL path.
void	setHandlerPredicate(BiPredicate<Object,ServerWebExchange> handlerPredicate) Configure a predicate for extended matching of the handler that was matched by URL path.
void	setLazyInitHandlers(boolean lazyInitHandlers) Set whether to lazily initialize handlers.
protected void	validateHandler(Object handler, ServerWebExchange exchange) Validate the given handler against the current request.

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

formatMappingName, getCorsConfiguration, getCorsProcessor, getHandler, getOrder, getPathPatternParser, hasCorsConfigurationSource, setBeanName, setCorsConfigurations, setCorsConfigurationSource, 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

AbstractUrlHandlerMapping

public AbstractUrlHandlerMapping()

Method Detail

setLazyInitHandlers

public void setLazyInitHandlers(boolean lazyInitHandlers)

Set whether to lazily initialize handlers. Only applicable to singleton handlers, as prototypes are always lazily initialized. Default is "false", as eager initialization allows for more efficiency through referencing the controller objects directly.

If you want to allow your controllers to be lazily initialized, make them "lazy-init" and set this flag to true. Just making them "lazy-init" will not work, as they are initialized through the references from the handler mapping in this case.

getHandlerMap

public final Map<PathPattern,Object> getHandlerMap()

Return a read-only view of registered path patterns and handlers which may may be an actual handler instance or the bean name of lazily initialized handler.

setHandlerPredicate

public void setHandlerPredicate(BiPredicate<Object,ServerWebExchange> handlerPredicate)

Configure a predicate for extended matching of the handler that was matched by URL path. This allows for further narrowing of the mapping by checking additional properties of the request. If the predicate returns "false", it result in a no-match, which allows another HandlerMapping to match or result in a 404 (NOT_FOUND) response.

Parameters:

handlerPredicate - a bi-predicate to match the candidate handler against the current exchange.

Since:

5.3.5

See Also:

WebSocketUpgradeHandlerPredicate

getHandlerInternal

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

Description copied from class: AbstractHandlerMapping

Look up a handler for the given request, returning an empty Mono if no specific one is found. This method is called by AbstractHandlerMapping.getHandler(org.springframework.web.server.ServerWebExchange).

On CORS pre-flight requests this method should return a match not for the pre-flight request but for the expected actual request based on the URL path, the HTTP methods from the "Access-Control-Request-Method" header, and the headers from the "Access-Control-Request-Headers" header.

Specified by:

getHandlerInternal in class AbstractHandlerMapping

Parameters:

exchange - current exchange

Returns:

Mono for the matching handler, if any

lookupHandler

@Nullable
protected Object lookupHandler(PathContainer lookupPath,
                                         ServerWebExchange exchange)
                                  throws Exception

Look up a handler instance for the given URL lookup path.

Supports direct matches, e.g. a registered "/test" matches "/test", and various path pattern matches, e.g. a registered "/t*" matches both "/test" and "/team". For details, see the PathPattern class.

Parameters:

lookupPath - the URL the handler is mapped to

exchange - the current exchange

Returns:

the associated handler instance, or null if not found

Throws:

Exception

See Also:

PathPattern

validateHandler

protected void validateHandler(Object handler,
                               ServerWebExchange exchange)

Validate the given handler against the current request.

The default implementation is empty. Can be overridden in subclasses, for example to enforce specific preconditions expressed in URL mappings.

Parameters:

handler - the handler object to validate

exchange - current exchange

registerHandler

protected void registerHandler(String[] urlPaths,
                               String beanName)
                        throws BeansException,
                               IllegalStateException

Register the specified handler for the given URL paths.

Parameters:

urlPaths - the URLs that the bean should be mapped to

beanName - the name of the handler bean

Throws:

BeansException - if the handler couldn't be registered

IllegalStateException - if there is a conflicting handler registered

registerHandler

protected void registerHandler(String urlPath,
                               Object handler)
                        throws BeansException,
                               IllegalStateException

Register the specified handler for the given URL path.

Parameters:

urlPath - the URL the bean should be mapped to

handler - the handler instance or handler bean name String (a bean name will automatically be resolved into the corresponding handler bean)

Throws:

BeansException - if the handler couldn't be registered

IllegalStateException - if there is a conflicting handler registered