/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.reactive.result.method.annotation;
import java.util.List;
import java.util.function.Function;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Mono;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.util.Assert;
import org.springframework.web.bind.support.WebBindingInitializer;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.HandlerAdapter;
import org.springframework.web.reactive.HandlerResult;
import org.springframework.web.reactive.result.method.InvocableHandlerMethod;
import org.springframework.web.server.ServerWebExchange;
/**
* Supports the invocation of {@code @RequestMapping} methods.
*
* @author Rossen Stoyanchev
* @since 5.0
*/
public class RequestMappingHandlerAdapter implements HandlerAdapter, ApplicationContextAware, InitializingBean {
private static final Log logger = LogFactory.getLog(RequestMappingHandlerAdapter.class);
private ServerCodecConfigurer messageCodecConfigurer;
private WebBindingInitializer webBindingInitializer;
private ArgumentResolverConfigurer argumentResolverConfigurer;
private ReactiveAdapterRegistry reactiveAdapterRegistry;
private ConfigurableApplicationContext applicationContext;
private ControllerMethodResolver methodResolver;
private ModelInitializer modelInitializer;
/**
* Configure HTTP message readers to de-serialize the request body with.
* <p>By default this is set to {@link ServerCodecConfigurer} with defaults.
*/
public void setMessageCodecConfigurer(ServerCodecConfigurer configurer) {
this.messageCodecConfigurer = configurer;
}
/**
* Return the configurer for HTTP message readers.
*/
public ServerCodecConfigurer getMessageCodecConfigurer() {
return this.messageCodecConfigurer;
}
/**
* Provide a WebBindingInitializer with "global" initialization to apply
* to every DataBinder instance.
*/
public void setWebBindingInitializer(WebBindingInitializer webBindingInitializer) {
this.webBindingInitializer = webBindingInitializer;
}
/**
* Return the configured WebBindingInitializer, or {@code null} if none.
*/
public WebBindingInitializer getWebBindingInitializer() {
return this.webBindingInitializer;
}
/**
* Configure resolvers for controller method arguments.
*/
public void setArgumentResolverConfigurer(ArgumentResolverConfigurer configurer) {
Assert.notNull(configurer, "ArgumentResolverConfigurer is required");
this.argumentResolverConfigurer = configurer;
}
/**
* Return the configured resolvers for controller method arguments.
*/
public ArgumentResolverConfigurer getArgumentResolverConfigurer() {
return this.argumentResolverConfigurer;
}
/**
* Configure the registry for adapting various reactive types.
* <p>By default this is an instance of {@link ReactiveAdapterRegistry} with
* default settings.
*/
public void setReactiveAdapterRegistry(ReactiveAdapterRegistry registry) {
this.reactiveAdapterRegistry = registry;
}
/**
* Return the configured registry for adapting reactive types.
*/
public ReactiveAdapterRegistry getReactiveAdapterRegistry() {
return this.reactiveAdapterRegistry;
}
/**
* A {@link ConfigurableApplicationContext} is expected for resolving
* expressions in method argument default values as well as for
* detecting {@code @ControllerAdvice} beans.
*/
@Override
public void setApplicationContext(ApplicationContext applicationContext) {
if (applicationContext instanceof ConfigurableApplicationContext) {
this.applicationContext = (ConfigurableApplicationContext) applicationContext;
}
}
public ConfigurableApplicationContext getApplicationContext() {
return this.applicationContext;
}
@Override
public void afterPropertiesSet() throws Exception {
if (this.messageCodecConfigurer == null) {
this.messageCodecConfigurer = ServerCodecConfigurer.create();
}
if (this.argumentResolverConfigurer == null) {
this.argumentResolverConfigurer = new ArgumentResolverConfigurer();
}
if (this.reactiveAdapterRegistry == null) {
this.reactiveAdapterRegistry = new ReactiveAdapterRegistry();
}
this.methodResolver = new ControllerMethodResolver(this.argumentResolverConfigurer,
this.messageCodecConfigurer, this.reactiveAdapterRegistry, this.applicationContext);
this.modelInitializer = new ModelInitializer(this.reactiveAdapterRegistry);
}
@Override
public boolean supports(Object handler) {
return HandlerMethod.class.equals(handler.getClass());
}
@Override
public Mono<HandlerResult> handle(ServerWebExchange exchange, Object handler) {
Assert.notNull(handler, "Expected handler");
HandlerMethod handlerMethod = (HandlerMethod) handler;
BindingContext bindingContext = new InitBinderBindingContext(
getWebBindingInitializer(), this.methodResolver.getInitBinderMethods(handlerMethod));
List<InvocableHandlerMethod> modelAttributeMethods =
this.methodResolver.getModelAttributeMethods(handlerMethod);
Function<Throwable, Mono<HandlerResult>> exceptionHandler =
ex -> handleException(ex, handlerMethod, bindingContext, exchange);
return this.modelInitializer
.initModel(bindingContext, modelAttributeMethods, exchange)
.then(Mono.defer(() -> this.methodResolver.getRequestMappingMethod(handlerMethod)
.invoke(exchange, bindingContext)
.doOnNext(result -> result.setExceptionHandler(exceptionHandler))
.onErrorResume(exceptionHandler)));
}
private Mono<HandlerResult> handleException(Throwable ex, HandlerMethod handlerMethod,
BindingContext bindingContext, ServerWebExchange exchange) {
return this.methodResolver.getExceptionHandlerMethod(ex, handlerMethod)
.map(invocable -> {
try {
if (logger.isDebugEnabled()) {
logger.debug("Invoking @ExceptionHandler method: " + invocable.getMethod());
}
bindingContext.getModel().asMap().clear();
Throwable cause = ex.getCause() != null ? ex.getCause() : ex;
return invocable.invoke(exchange, bindingContext, cause, handlerMethod);
}
catch (Throwable invocationEx) {
if (logger.isWarnEnabled()) {
logger.warn("Failed to invoke: " + invocable.getMethod(), invocationEx);
}
return null;
}
})
.orElseGet(() -> Mono.error(ex));
}
}