/*
 * Copyright 2002-2012 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.servlet.mvc.method.annotation;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.xml.transform.Source;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
import org.springframework.core.OrderComparator;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.core.task.AsyncTaskExecutor;
import org.springframework.core.task.SimpleAsyncTaskExecutor;
import org.springframework.http.converter.ByteArrayHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
import org.springframework.http.converter.xml.SourceHttpMessageConverter;
import org.springframework.ui.ModelMap;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ReflectionUtils.MethodFilter;
import org.springframework.web.accept.ContentNegotiationManager;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.support.DefaultDataBinderFactory;
import org.springframework.web.bind.support.DefaultSessionAttributeStore;
import org.springframework.web.bind.support.SessionAttributeStore;
import org.springframework.web.bind.support.WebBindingInitializer;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.context.request.async.WebAsyncTask;
import org.springframework.web.context.request.async.AsyncWebRequest;
import org.springframework.web.context.request.async.CallableProcessingInterceptor;
import org.springframework.web.context.request.async.DeferredResultProcessingInterceptor;
import org.springframework.web.context.request.async.WebAsyncManager;
import org.springframework.web.context.request.async.WebAsyncUtils;
import org.springframework.web.method.ControllerAdviceBean;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.method.HandlerMethodSelector;
import org.springframework.web.method.annotation.ErrorsMethodArgumentResolver;
import org.springframework.web.method.annotation.ExpressionValueMethodArgumentResolver;
import org.springframework.web.method.annotation.MapMethodProcessor;
import org.springframework.web.method.annotation.ModelAttributeMethodProcessor;
import org.springframework.web.method.annotation.ModelFactory;
import org.springframework.web.method.annotation.ModelMethodProcessor;
import org.springframework.web.method.annotation.RequestHeaderMapMethodArgumentResolver;
import org.springframework.web.method.annotation.RequestHeaderMethodArgumentResolver;
import org.springframework.web.method.annotation.RequestParamMapMethodArgumentResolver;
import org.springframework.web.method.annotation.RequestParamMethodArgumentResolver;
import org.springframework.web.method.annotation.SessionAttributesHandler;
import org.springframework.web.method.annotation.SessionStatusMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodArgumentResolverComposite;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite;
import org.springframework.web.method.support.InvocableHandlerMethod;
import org.springframework.web.method.support.ModelAndViewContainer;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.mvc.annotation.ModelAndViewResolver;
import org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import org.springframework.web.servlet.support.RequestContextUtils;
import org.springframework.web.util.WebUtils;

/**
 * An {@link AbstractHandlerMethodAdapter} that supports {@link HandlerMethod}s
 * with the signature -- method argument and return types, defined in
 * {@code @RequestMapping}.
 *
 * <p>Support for custom argument and return value types can be added via
 * {@link #setCustomArgumentResolvers} and {@link #setCustomReturnValueHandlers}.
 * Or alternatively to re-configure all argument and return value types use
 * {@link #setArgumentResolvers} and {@link #setReturnValueHandlers(List)}.
 *
 * @author Rossen Stoyanchev
 * @since 3.1
 * @see HandlerMethodArgumentResolver
 * @see HandlerMethodReturnValueHandler
 */
public class RequestMappingHandlerAdapter extends AbstractHandlerMethodAdapter implements BeanFactoryAware,
		InitializingBean {

	private List<HandlerMethodArgumentResolver> customArgumentResolvers;

	private HandlerMethodArgumentResolverComposite argumentResolvers;

	private HandlerMethodArgumentResolverComposite initBinderArgumentResolvers;

	private List<HandlerMethodReturnValueHandler> customReturnValueHandlers;

	private HandlerMethodReturnValueHandlerComposite returnValueHandlers;

	private List<ModelAndViewResolver> modelAndViewResolvers;

	private ContentNegotiationManager contentNegotiationManager = new ContentNegotiationManager();

	private List<HttpMessageConverter<?>> messageConverters;

	private WebBindingInitializer webBindingInitializer;

	private AsyncTaskExecutor taskExecutor = new SimpleAsyncTaskExecutor("MvcAsync");

	private Long asyncRequestTimeout;

	private CallableProcessingInterceptor[] callableInterceptors = new CallableProcessingInterceptor[] {};

	private DeferredResultProcessingInterceptor[] deferredResultInterceptors = new DeferredResultProcessingInterceptor[] {};

	private boolean ignoreDefaultModelOnRedirect = false;

	private int cacheSecondsForSessionAttributeHandlers = 0;

	private boolean synchronizeOnSession = false;

	private SessionAttributeStore sessionAttributeStore = new DefaultSessionAttributeStore();

	private ParameterNameDiscoverer parameterNameDiscoverer = new LocalVariableTableParameterNameDiscoverer();

	private ConfigurableBeanFactory beanFactory;


	private final Map<Class<?>, SessionAttributesHandler> sessionAttributesHandlerCache =
			new ConcurrentHashMap<Class<?>, SessionAttributesHandler>(64);

	private final Map<Class<?>, Set<Method>> initBinderCache = new ConcurrentHashMap<Class<?>, Set<Method>>(64);

	private final Map<ControllerAdviceBean, Set<Method>> initBinderAdviceCache =
			new LinkedHashMap<ControllerAdviceBean, Set<Method>>();

	private final Map<Class<?>, Set<Method>> modelAttributeCache = new ConcurrentHashMap<Class<?>, Set<Method>>(64);

	private final Map<ControllerAdviceBean, Set<Method>> modelAttributeAdviceCache =
			new LinkedHashMap<ControllerAdviceBean, Set<Method>>();


	/**
	 * Default constructor.
	 */
	public RequestMappingHandlerAdapter() {

		StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter();
		stringHttpMessageConverter.setWriteAcceptCharset(false); // See SPR-7316

		this.messageConverters = new ArrayList<HttpMessageConverter<?>>();
		this.messageConverters.add(new ByteArrayHttpMessageConverter());
		this.messageConverters.add(stringHttpMessageConverter);
		this.messageConverters.add(new SourceHttpMessageConverter<Source>());
		this.messageConverters.add(new AllEncompassingFormHttpMessageConverter());
	}

	/**
	 * Provide resolvers for custom argument types. Custom resolvers are ordered
	 * after built-in ones. To override the built-in support for argument
	 * resolution use {@link #setArgumentResolvers} instead.
	 */
	public void setCustomArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
		this.customArgumentResolvers = argumentResolvers;
	}

	/**
	 * Return the custom argument resolvers, or {@code null}.
	 */
	public List<HandlerMethodArgumentResolver> getCustomArgumentResolvers() {
		return this.customArgumentResolvers;
	}

	/**
	 * Configure the complete list of supported argument types thus overriding
	 * the resolvers that would otherwise be configured by default.
	 */
	public void setArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
		if (argumentResolvers == null) {
			this.argumentResolvers = null;
		}
		else {
			this.argumentResolvers = new HandlerMethodArgumentResolverComposite();
			this.argumentResolvers.addResolvers(argumentResolvers);
		}
	}

	/**
	 * Return the configured argument resolvers, or possibly {@code null} if
	 * not initialized yet via {@link #afterPropertiesSet()}.
	 */
	public HandlerMethodArgumentResolverComposite getArgumentResolvers() {
		return this.argumentResolvers;
	}

	/**
	 * Configure the supported argument types in {@code @InitBinder} methods.
	 */
	public void setInitBinderArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
		if (argumentResolvers == null) {
			this.initBinderArgumentResolvers = null;
		}
		else {
			this.initBinderArgumentResolvers = new HandlerMethodArgumentResolverComposite();
			this.initBinderArgumentResolvers.addResolvers(argumentResolvers);
		}
	}

	/**
	 * Return the argument resolvers for {@code @InitBinder} methods, or possibly
	 * {@code null} if not initialized yet via {@link #afterPropertiesSet()}.
	 */
	public HandlerMethodArgumentResolverComposite getInitBinderArgumentResolvers() {
		return this.initBinderArgumentResolvers;
	}

	/**
	 * Provide handlers for custom return value types. Custom handlers are
	 * ordered after built-in ones. To override the built-in support for
	 * return value handling use {@link #setReturnValueHandlers}.
	 */
	public void setCustomReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) {
		this.customReturnValueHandlers = returnValueHandlers;
	}

	/**
	 * Return the custom return value handlers, or {@code null}.
	 */
	public List<HandlerMethodReturnValueHandler> getCustomReturnValueHandlers() {
		return this.customReturnValueHandlers;
	}

	/**
	 * Configure the complete list of supported return value types thus
	 * overriding handlers that would otherwise be configured by default.
	 */
	public void setReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) {
		if (returnValueHandlers == null) {
			this.returnValueHandlers = null;
		}
		else {
			this.returnValueHandlers = new HandlerMethodReturnValueHandlerComposite();
			this.returnValueHandlers.addHandlers(returnValueHandlers);
		}
	}

	/**
	 * Return the configured handlers, or possibly {@code null} if not
	 * initialized yet via {@link #afterPropertiesSet()}.
	 */
	public HandlerMethodReturnValueHandlerComposite getReturnValueHandlers() {
		return this.returnValueHandlers;
	}

	/**
	 * Provide custom {@link ModelAndViewResolver}s.
	 * <p><strong>Note:</strong> This method is available for backwards
	 * compatibility only. However, it is recommended to re-write a
	 * {@code ModelAndViewResolver} as {@link HandlerMethodReturnValueHandler}.
	 * An adapter between the two interfaces is not possible since the
	 * {@link HandlerMethodReturnValueHandler#supportsReturnType} method
	 * cannot be implemented. Hence {@code ModelAndViewResolver}s are limited
	 * to always being invoked at the end after all other return value
	 * handlers have been given a chance.
	 * <p>A {@code HandlerMethodReturnValueHandler} provides better access to
	 * the return type and controller method information and can be ordered
	 * freely relative to other return value handlers.
	 */
	public void setModelAndViewResolvers(List<ModelAndViewResolver> modelAndViewResolvers) {
		this.modelAndViewResolvers = modelAndViewResolvers;
	}

	/**
	 * Return the configured {@link ModelAndViewResolver}s, or {@code null}.
	 */
	public List<ModelAndViewResolver> getModelAndViewResolvers() {
		return modelAndViewResolvers;
	}

	/**
	 * Provide the converters to use in argument resolvers and return value
	 * handlers that support reading and/or writing to the body of the
	 * request and response.
	 */
	public void setMessageConverters(List<HttpMessageConverter<?>> messageConverters) {
		this.messageConverters = messageConverters;
	}

	/**
	 * Set the {@link ContentNegotiationManager} to use to determine requested media types.
	 * If not set, the default constructor is used.
	 */
	public void setContentNegotiationManager(ContentNegotiationManager contentNegotiationManager) {
		this.contentNegotiationManager = contentNegotiationManager;
	}

	/**
	 * Return the configured message body converters.
	 */
	public List<HttpMessageConverter<?>> getMessageConverters() {
		return messageConverters;
	}

	/**
	 * 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}.
	 */
	public WebBindingInitializer getWebBindingInitializer() {
		return webBindingInitializer;
	}

	/**
	 * Set the default {@link AsyncTaskExecutor} to use when a controller method
	 * return a {@link Callable}. Controller methods can override this default on
	 * a per-request basis by returning an {@link WebAsyncTask}.
	 * <p>By default a {@link SimpleAsyncTaskExecutor} instance is used.
	 * It's recommended to change that default in production as the simple executor
	 * does not re-use threads.
	 */
	public void setTaskExecutor(AsyncTaskExecutor taskExecutor) {
		this.taskExecutor = taskExecutor;
	}

	/**
	 * Specify the amount of time, in milliseconds, before concurrent handling
	 * should time out. In Servlet 3, the timeout begins after the main request
	 * processing thread has exited and ends when the request is dispatched again
	 * for further processing of the concurrently produced result.
	 * <p>If this value is not set, the default timeout of the underlying
	 * implementation is used, e.g. 10 seconds on Tomcat with Servlet 3.
	 * @param timeout the timeout value in milliseconds
	 */
	public void setAsyncRequestTimeout(long timeout) {
		this.asyncRequestTimeout = timeout;
	}

	/**
	 * Configure {@code CallableProcessingInterceptor}'s to register on async requests.
	 * @param interceptors the interceptors to register
	 */
	public void setCallableInterceptors(List<CallableProcessingInterceptor> interceptors) {
		Assert.notNull(interceptors);
		this.callableInterceptors = interceptors.toArray(new CallableProcessingInterceptor[interceptors.size()]);
	}

	/**
	 * Configure {@code DeferredResultProcessingInterceptor}'s to register on async requests.
	 * @param interceptors the interceptors to register
	 */
	public void setDeferredResultInterceptors(List<DeferredResultProcessingInterceptor> interceptors) {
		Assert.notNull(interceptors);
		this.deferredResultInterceptors = interceptors.toArray(new DeferredResultProcessingInterceptor[interceptors.size()]);
	}

	/**
	 * By default the content of the "default" model is used both during
	 * rendering and redirect scenarios. Alternatively a controller method
	 * can declare a {@link RedirectAttributes} argument and use it to provide
	 * attributes for a redirect.
	 * <p>Setting this flag to {@code true} guarantees the "default" model is
	 * never used in a redirect scenario even if a RedirectAttributes argument
	 * is not declared. Setting it to {@code false} means the "default" model
	 * may be used in a redirect if the controller method doesn't declare a
	 * RedirectAttributes argument.
	 * <p>The default setting is {@code false} but new applications should
	 * consider setting it to {@code true}.
	 * @see RedirectAttributes
	 */
	public void setIgnoreDefaultModelOnRedirect(boolean ignoreDefaultModelOnRedirect) {
		this.ignoreDefaultModelOnRedirect = ignoreDefaultModelOnRedirect;
	}

	/**
	 * Specify the strategy to store session attributes with. The default is
	 * {@link org.springframework.web.bind.support.DefaultSessionAttributeStore},
	 * storing session attributes in the HttpSession with the same attribute
	 * name as in the model.
	 */
	public void setSessionAttributeStore(SessionAttributeStore sessionAttributeStore) {
		this.sessionAttributeStore = sessionAttributeStore;
	}

	/**
	 * Cache content produced by {@code @SessionAttributes} annotated handlers
	 * for the given number of seconds. Default is 0, preventing caching completely.
	 * <p>In contrast to the "cacheSeconds" property which will apply to all general
	 * handlers (but not to {@code @SessionAttributes} annotated handlers),
	 * this setting will apply to {@code @SessionAttributes} handlers only.
	 * @see #setCacheSeconds
	 * @see org.springframework.web.bind.annotation.SessionAttributes
	 */
	public void setCacheSecondsForSessionAttributeHandlers(int cacheSecondsForSessionAttributeHandlers) {
		this.cacheSecondsForSessionAttributeHandlers = cacheSecondsForSessionAttributeHandlers;
	}

	/**
	 * Set if controller execution should be synchronized on the session,
	 * to serialize parallel invocations from the same client.
	 * <p>More specifically, the execution of the {@code handleRequestInternal}
	 * method will get synchronized if this flag is "true". The best available
	 * session mutex will be used for the synchronization; ideally, this will
	 * be a mutex exposed by HttpSessionMutexListener.
	 * <p>The session mutex is guaranteed to be the same object during
	 * the entire lifetime of the session, available under the key defined
	 * by the {@code SESSION_MUTEX_ATTRIBUTE} constant. It serves as a
	 * safe reference to synchronize on for locking on the current session.
	 * <p>In many cases, the HttpSession reference itself is a safe mutex
	 * as well, since it will always be the same object reference for the
	 * same active logical session. However, this is not guaranteed across
	 * different servlet containers; the only 100% safe way is a session mutex.
	 * @see org.springframework.web.util.HttpSessionMutexListener
	 * @see org.springframework.web.util.WebUtils#getSessionMutex(javax.servlet.http.HttpSession)
	 */
	public void setSynchronizeOnSession(boolean synchronizeOnSession) {
		this.synchronizeOnSession = synchronizeOnSession;
	}

	/**
	 * Set the ParameterNameDiscoverer to use for resolving method parameter
	 * names if needed (e.g. for default attribute names). Default is a
	 * {@link org.springframework.core.LocalVariableTableParameterNameDiscoverer}.
	 */
	public void setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer) {
		this.parameterNameDiscoverer = parameterNameDiscoverer;
	}

	/**
	 * {@inheritDoc}
	 * <p>A {@link ConfigurableBeanFactory} is expected for resolving
	 * expressions in method argument default values.
	 */
	public void setBeanFactory(BeanFactory beanFactory) {
		if (beanFactory instanceof ConfigurableBeanFactory) {
			this.beanFactory = (ConfigurableBeanFactory) beanFactory;
		}
	}

	/**
	 * Return the owning factory of this bean instance, or {@code null}.
	 */
	protected ConfigurableBeanFactory getBeanFactory() {
		return this.beanFactory;
	}

	public void afterPropertiesSet() {
		if (this.argumentResolvers == null) {
			List<HandlerMethodArgumentResolver> resolvers = getDefaultArgumentResolvers();
			this.argumentResolvers = new HandlerMethodArgumentResolverComposite().addResolvers(resolvers);
		}
		if (this.initBinderArgumentResolvers == null) {
			List<HandlerMethodArgumentResolver> resolvers = getDefaultInitBinderArgumentResolvers();
			this.initBinderArgumentResolvers = new HandlerMethodArgumentResolverComposite().addResolvers(resolvers);
		}
		if (this.returnValueHandlers == null) {
			List<HandlerMethodReturnValueHandler> handlers = getDefaultReturnValueHandlers();
			this.returnValueHandlers = new HandlerMethodReturnValueHandlerComposite().addHandlers(handlers);
		}
		initControllerAdviceCache();
	}

	/**
	 * Return the list of argument resolvers to use including built-in resolvers
	 * and custom resolvers provided via {@link #setCustomArgumentResolvers}.
	 */
	private List<HandlerMethodArgumentResolver> getDefaultArgumentResolvers() {
		List<HandlerMethodArgumentResolver> resolvers = new ArrayList<HandlerMethodArgumentResolver>();

		// Annotation-based argument resolution
		resolvers.add(new RequestParamMethodArgumentResolver(getBeanFactory(), false));
		resolvers.add(new RequestParamMapMethodArgumentResolver());
		resolvers.add(new PathVariableMethodArgumentResolver());
		resolvers.add(new PathVariableMapMethodArgumentResolver());
		resolvers.add(new MatrixVariableMethodArgumentResolver());
		resolvers.add(new MatrixVariableMapMethodArgumentResolver());
		resolvers.add(new ServletModelAttributeMethodProcessor(false));
		resolvers.add(new RequestResponseBodyMethodProcessor(getMessageConverters()));
		resolvers.add(new RequestPartMethodArgumentResolver(getMessageConverters()));
		resolvers.add(new RequestHeaderMethodArgumentResolver(getBeanFactory()));
		resolvers.add(new RequestHeaderMapMethodArgumentResolver());
		resolvers.add(new ServletCookieValueMethodArgumentResolver(getBeanFactory()));
		resolvers.add(new ExpressionValueMethodArgumentResolver(getBeanFactory()));

		// Type-based argument resolution
		resolvers.add(new ServletRequestMethodArgumentResolver());
		resolvers.add(new ServletResponseMethodArgumentResolver());
		resolvers.add(new HttpEntityMethodProcessor(getMessageConverters()));
		resolvers.add(new RedirectAttributesMethodArgumentResolver());
		resolvers.add(new ModelMethodProcessor());
		resolvers.add(new MapMethodProcessor());
		resolvers.add(new ErrorsMethodArgumentResolver());
		resolvers.add(new SessionStatusMethodArgumentResolver());
		resolvers.add(new UriComponentsBuilderMethodArgumentResolver());

		// Custom arguments
		if (getCustomArgumentResolvers() != null) {
			resolvers.addAll(getCustomArgumentResolvers());
		}

		// Catch-all
		resolvers.add(new RequestParamMethodArgumentResolver(getBeanFactory(), true));
		resolvers.add(new ServletModelAttributeMethodProcessor(true));

		return resolvers;
	}

	/**
	 * Return the list of argument resolvers to use for {@code @InitBinder}
	 * methods including built-in and custom resolvers.
	 */
	private List<HandlerMethodArgumentResolver> getDefaultInitBinderArgumentResolvers() {
		List<HandlerMethodArgumentResolver> resolvers = new ArrayList<HandlerMethodArgumentResolver>();

		// Annotation-based argument resolution
		resolvers.add(new RequestParamMethodArgumentResolver(getBeanFactory(), false));
		resolvers.add(new RequestParamMapMethodArgumentResolver());
		resolvers.add(new PathVariableMethodArgumentResolver());
		resolvers.add(new PathVariableMapMethodArgumentResolver());
		resolvers.add(new MatrixVariableMethodArgumentResolver());
		resolvers.add(new MatrixVariableMapMethodArgumentResolver());
		resolvers.add(new ExpressionValueMethodArgumentResolver(getBeanFactory()));

		// Type-based argument resolution
		resolvers.add(new ServletRequestMethodArgumentResolver());
		resolvers.add(new ServletResponseMethodArgumentResolver());

		// Custom arguments
		if (getCustomArgumentResolvers() != null) {
			resolvers.addAll(getCustomArgumentResolvers());
		}

		// Catch-all
		resolvers.add(new RequestParamMethodArgumentResolver(getBeanFactory(), true));

		return resolvers;
	}

	/**
	 * Return the list of return value handlers to use including built-in and
	 * custom handlers provided via {@link #setReturnValueHandlers}.
	 */
	private List<HandlerMethodReturnValueHandler> getDefaultReturnValueHandlers() {
		List<HandlerMethodReturnValueHandler> handlers = new ArrayList<HandlerMethodReturnValueHandler>();

		// Single-purpose return value types
		handlers.add(new ModelAndViewMethodReturnValueHandler());
		handlers.add(new ModelMethodProcessor());
		handlers.add(new ViewMethodReturnValueHandler());
		handlers.add(new HttpEntityMethodProcessor(getMessageConverters(), this.contentNegotiationManager));
		handlers.add(new CallableMethodReturnValueHandler());
		handlers.add(new DeferredResultMethodReturnValueHandler());
		handlers.add(new AsyncTaskMethodReturnValueHandler(this.beanFactory));

		// Annotation-based return value types
		handlers.add(new ModelAttributeMethodProcessor(false));
		handlers.add(new RequestResponseBodyMethodProcessor(getMessageConverters(), this.contentNegotiationManager));

		// Multi-purpose return value types
		handlers.add(new ViewNameMethodReturnValueHandler());
		handlers.add(new MapMethodProcessor());

		// Custom return value types
		if (getCustomReturnValueHandlers() != null) {
			handlers.addAll(getCustomReturnValueHandlers());
		}

		// Catch-all
		if (!CollectionUtils.isEmpty(getModelAndViewResolvers())) {
			handlers.add(new ModelAndViewResolverMethodReturnValueHandler(getModelAndViewResolvers()));
		}
		else {
			handlers.add(new ModelAttributeMethodProcessor(true));
		}

		return handlers;
	}

	private void initControllerAdviceCache() {
		if (getApplicationContext() == null) {
			return;
		}
		if (logger.isDebugEnabled()) {
			logger.debug("Looking for controller advice: " + getApplicationContext());
		}

		List<ControllerAdviceBean> beans = ControllerAdviceBean.findAnnotatedBeans(getApplicationContext());
		Collections.sort(beans, new OrderComparator());

		for (ControllerAdviceBean bean : beans) {
			Set<Method> attrMethods = HandlerMethodSelector.selectMethods(bean.getBeanType(), MODEL_ATTRIBUTE_METHODS);
			if (!attrMethods.isEmpty()) {
				this.modelAttributeAdviceCache.put(bean, attrMethods);
				logger.info("Detected @ModelAttribute methods in " + bean);
			}
			Set<Method> binderMethods = HandlerMethodSelector.selectMethods(bean.getBeanType(), INIT_BINDER_METHODS);
			if (!binderMethods.isEmpty()) {
				this.initBinderAdviceCache.put(bean, binderMethods);
				logger.info("Detected @InitBinder methods in " + bean);
			}
		}
	}

	/**
	 * Always return {@code true} since any method argument and return value
	 * type will be processed in some way. A method argument not recognized
	 * by any HandlerMethodArgumentResolver is interpreted as a request parameter
	 * if it is a simple type, or as a model attribute otherwise. A return value
	 * not recognized by any HandlerMethodReturnValueHandler will be interpreted
	 * as a model attribute.
	 */
	@Override
	protected boolean supportsInternal(HandlerMethod handlerMethod) {
		return true;
	}

	/**
	 * This implementation always returns -1. An {@code @RequestMapping}
	 * method can calculate the lastModified value, call
	 * {@link WebRequest#checkNotModified(long)}, and return {@code null}
	 * if the result of that call is {@code true}.
	 */
	@Override
	protected long getLastModifiedInternal(HttpServletRequest request, HandlerMethod handlerMethod) {
		return -1;
	}

	@Override
	protected final ModelAndView handleInternal(HttpServletRequest request,
			HttpServletResponse response, HandlerMethod handlerMethod) throws Exception {

		if (getSessionAttributesHandler(handlerMethod).hasSessionAttributes()) {
			// Always prevent caching in case of session attribute management.
			checkAndPrepare(request, response, this.cacheSecondsForSessionAttributeHandlers, true);
		}
		else {
			// Uses configured default cacheSeconds setting.
			checkAndPrepare(request, response, true);
		}

		// Execute invokeHandlerMethod in synchronized block if required.
		if (this.synchronizeOnSession) {
			HttpSession session = request.getSession(false);
			if (session != null) {
				Object mutex = WebUtils.getSessionMutex(session);
				synchronized (mutex) {
					return invokeHandleMethod(request, response, handlerMethod);
				}
			}
		}

		return invokeHandleMethod(request, response, handlerMethod);
	}

	/**
	 * Return the {@link SessionAttributesHandler} instance for the given
	 * handler type, never {@code null}.
	 */
	private SessionAttributesHandler getSessionAttributesHandler(HandlerMethod handlerMethod) {
		Class<?> handlerType = handlerMethod.getBeanType();
		SessionAttributesHandler sessionAttrHandler = this.sessionAttributesHandlerCache.get(handlerType);
		if (sessionAttrHandler == null) {
			synchronized(this.sessionAttributesHandlerCache) {
				sessionAttrHandler = this.sessionAttributesHandlerCache.get(handlerType);
				if (sessionAttrHandler == null) {
					sessionAttrHandler = new SessionAttributesHandler(handlerType, sessionAttributeStore);
					this.sessionAttributesHandlerCache.put(handlerType, sessionAttrHandler);
				}
			}
		}
		return sessionAttrHandler;
	}

	/**
	 * Invoke the {@link RequestMapping} handler method preparing a {@link ModelAndView} if view resolution is required.
	 */
	private ModelAndView invokeHandleMethod(HttpServletRequest request,
			HttpServletResponse response, HandlerMethod handlerMethod) throws Exception {

		ServletWebRequest webRequest = new ServletWebRequest(request, response);

		WebDataBinderFactory binderFactory = getDataBinderFactory(handlerMethod);
		ModelFactory modelFactory = getModelFactory(handlerMethod, binderFactory);
		ServletInvocableHandlerMethod requestMappingMethod = createRequestMappingMethod(handlerMethod, binderFactory);

		ModelAndViewContainer mavContainer = new ModelAndViewContainer();
		mavContainer.addAllAttributes(RequestContextUtils.getInputFlashMap(request));
		modelFactory.initModel(webRequest, mavContainer, requestMappingMethod);
		mavContainer.setIgnoreDefaultModelOnRedirect(this.ignoreDefaultModelOnRedirect);

		AsyncWebRequest asyncWebRequest = WebAsyncUtils.createAsyncWebRequest(request, response);
		asyncWebRequest.setTimeout(this.asyncRequestTimeout);

		final WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
		asyncManager.setTaskExecutor(this.taskExecutor);
		asyncManager.setAsyncWebRequest(asyncWebRequest);
		asyncManager.registerCallableInterceptors(this.callableInterceptors);
		asyncManager.registerDeferredResultInterceptors(this.deferredResultInterceptors);

		if (asyncManager.hasConcurrentResult()) {
			Object result = asyncManager.getConcurrentResult();
			mavContainer = (ModelAndViewContainer) asyncManager.getConcurrentResultContext()[0];
			asyncManager.clearConcurrentResult();

			if (logger.isDebugEnabled()) {
				logger.debug("Found concurrent result value [" + result + "]");
			}
			requestMappingMethod = requestMappingMethod.wrapConcurrentResult(result);
		}

		requestMappingMethod.invokeAndHandle(webRequest, mavContainer);

		if (asyncManager.isConcurrentHandlingStarted()) {
			return null;
		}

		return getModelAndView(mavContainer, modelFactory, webRequest);
	}

	private ServletInvocableHandlerMethod createRequestMappingMethod(
			HandlerMethod handlerMethod, WebDataBinderFactory binderFactory) {

		ServletInvocableHandlerMethod requestMethod;
		requestMethod = new ServletInvocableHandlerMethod(handlerMethod);
		requestMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
		requestMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);
		requestMethod.setDataBinderFactory(binderFactory);
		requestMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);
		return requestMethod;
	}

	private ModelFactory getModelFactory(HandlerMethod handlerMethod, WebDataBinderFactory binderFactory) {
		SessionAttributesHandler sessionAttrHandler = getSessionAttributesHandler(handlerMethod);
		Class<?> handlerType = handlerMethod.getBeanType();
		Set<Method> methods = this.modelAttributeCache.get(handlerType);
		if (methods == null) {
			methods = HandlerMethodSelector.selectMethods(handlerType, MODEL_ATTRIBUTE_METHODS);
			this.modelAttributeCache.put(handlerType, methods);
		}
		List<InvocableHandlerMethod> attrMethods = new ArrayList<InvocableHandlerMethod>();
		for (Method method : methods) {
			Object bean = handlerMethod.getBean();
			attrMethods.add(createModelAttributeMethod(binderFactory, bean, method));
		}
		for (Entry<ControllerAdviceBean, Set<Method>> entry : this.modelAttributeAdviceCache.entrySet()) {
			Object bean = entry.getKey().resolveBean();
			for (Method method : entry.getValue()) {
				attrMethods.add(createModelAttributeMethod(binderFactory, bean, method));
			}
		}
		return new ModelFactory(attrMethods, binderFactory, sessionAttrHandler);
	}

	private InvocableHandlerMethod createModelAttributeMethod(WebDataBinderFactory factory, Object bean, Method method) {
		InvocableHandlerMethod attrMethod = new InvocableHandlerMethod(bean, method);
		attrMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
		attrMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);
		attrMethod.setDataBinderFactory(factory);
		return attrMethod;
	}

	private WebDataBinderFactory getDataBinderFactory(HandlerMethod handlerMethod) throws Exception {
		Class<?> handlerType = handlerMethod.getBeanType();
		Set<Method> methods = this.initBinderCache.get(handlerType);
		if (methods == null) {
			methods = HandlerMethodSelector.selectMethods(handlerType, INIT_BINDER_METHODS);
			this.initBinderCache.put(handlerType, methods);
		}
		List<InvocableHandlerMethod> initBinderMethods = new ArrayList<InvocableHandlerMethod>();
		for (Method method : methods) {
			Object bean = handlerMethod.getBean();
			initBinderMethods.add(createInitBinderMethod(bean, method));
		}
		for (Entry<ControllerAdviceBean, Set<Method>> entry : this.initBinderAdviceCache .entrySet()) {
			Object bean = entry.getKey().resolveBean();
			for (Method method : entry.getValue()) {
				initBinderMethods.add(createInitBinderMethod(bean, method));
			}
		}
		return createDataBinderFactory(initBinderMethods);
	}

	private InvocableHandlerMethod createInitBinderMethod(Object bean, Method method) {
		InvocableHandlerMethod binderMethod = new InvocableHandlerMethod(bean, method);
		binderMethod.setHandlerMethodArgumentResolvers(this.initBinderArgumentResolvers);
		binderMethod.setDataBinderFactory(new DefaultDataBinderFactory(this.webBindingInitializer));
		binderMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);
		return binderMethod;
	}

	/**
	 * Template method to create a new ServletRequestDataBinderFactory instance.
	 * <p>The default implementation creates a ServletRequestDataBinderFactory.
	 * This can be overridden for custom ServletRequestDataBinder subclasses.
	 * @param binderMethods {@code @InitBinder} methods
	 * @return the ServletRequestDataBinderFactory instance to use
	 * @throws Exception in case of invalid state or arguments
	 */
	protected ServletRequestDataBinderFactory createDataBinderFactory(List<InvocableHandlerMethod> binderMethods)
			throws Exception {

		return new ServletRequestDataBinderFactory(binderMethods, getWebBindingInitializer());
	}

	private ModelAndView getModelAndView(ModelAndViewContainer mavContainer,
			ModelFactory modelFactory, NativeWebRequest webRequest) throws Exception {

		modelFactory.updateModel(webRequest, mavContainer);

		if (mavContainer.isRequestHandled()) {
			return null;
		}
		ModelMap model = mavContainer.getModel();
		ModelAndView mav = new ModelAndView(mavContainer.getViewName(), model);
		if (!mavContainer.isViewReference()) {
			mav.setView((View) mavContainer.getView());
		}
		if (model instanceof RedirectAttributes) {
			Map<String, ?> flashAttributes = ((RedirectAttributes) model).getFlashAttributes();
			HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
			RequestContextUtils.getOutputFlashMap(request).putAll(flashAttributes);
		}
		return mav;
	}


	/**
	 * MethodFilter that matches {@link InitBinder @InitBinder} methods.
	 */
	public static final MethodFilter INIT_BINDER_METHODS = new MethodFilter() {

		public boolean matches(Method method) {
			return AnnotationUtils.findAnnotation(method, InitBinder.class) != null;
		}
	};

	/**
	 * MethodFilter that matches {@link ModelAttribute @ModelAttribute} methods.
	 */
	public static final MethodFilter MODEL_ATTRIBUTE_METHODS = new MethodFilter() {

		public boolean matches(Method method) {
			return ((AnnotationUtils.findAnnotation(method, RequestMapping.class) == null) &&
					(AnnotationUtils.findAnnotation(method, ModelAttribute.class) != null));
		}
	};

}
