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/*
* Copyright 2008 biaoping.yin
*
* 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.frameworkset.web.servlet.handler.annotations;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;
import org.frameworkset.http.converter.HttpMessageConverter;
import org.frameworkset.util.ReflectionUtils;
import org.frameworkset.util.annotations.MethodData;
import org.frameworkset.web.servlet.HandlerMapping;
import org.frameworkset.web.servlet.ModelMap;
import org.frameworkset.web.servlet.handler.AbstractUrlHandlerMapping;
import org.frameworkset.web.servlet.handler.HandlerMeta;
import org.frameworkset.web.servlet.handler.HandlerUtils;
import org.frameworkset.web.servlet.support.RequestContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.frameworkset.util.BeanUtils;
/**
*
* Title: HandlerMethodInvoker.java
*
*
* Description:
*
*
* bboss workgroup
*
*
* Copyright (c) 2008
*
*
* @Date 2010-10-24
* @author biaoping.yin
* @version 1.0
*/
public class HandlerMethodInvoker {
/**
* We'll create a lot of these objects, so we don't want a new logger every
* time.
*/
protected final static Logger logger = LoggerFactory.getLogger(HandlerMethodInvoker.class);
private final HandlerMethodResolver methodResolver;
//
//// private final WebBindingInitializer bindingInitializer;
//
// private final SessionAttributeStore sessionAttributeStore;
//
// private final ParameterNameDiscoverer parameterNameDiscoverer;
//
// private final WebArgumentResolver[] customArgumentResolvers;
protected HttpMessageConverter[] messageConverters;
// private final SimpleSessionStatus sessionStatus = new SimpleSessionStatus();
// public HandlerMethodInvoker(HandlerMethodResolver methodResolver,HttpMessageConverter[] messageConverters) {
// this(methodResolver, null,messageConverters);
// }
// public HandlerMethodInvoker(HandlerMethodResolver methodResolver,
// WebBindingInitializer bindingInitializer,
// HttpMessageConverter[] messageConverters) {
// this(messageConverters,methodResolver,
//// bindingInitializer,
// new DefaultSessionAttributeStore(), null);
// }
public HandlerMethodInvoker(HttpMessageConverter[] messageConverters,
// ,
HandlerMethodResolver methodResolver
// ,
// WebBindingInitializer bindingInitializer,
// SessionAttributeStore sessionAttributeStore,
// ParameterNameDiscoverer parameterNameDiscoverer,
// WebArgumentResolver... customArgumentResolvers
) {
this.methodResolver = methodResolver;
// this.bindingInitializer = bindingInitializer;
// this.sessionAttributeStore = sessionAttributeStore;
// this.parameterNameDiscoverer = parameterNameDiscoverer;
// this.customArgumentResolvers = customArgumentResolvers;
this.messageConverters = messageConverters;
}
public final Object invokeHandlerMethod(MethodData handlerMethod,
HandlerMeta handler, HttpServletRequest request,
HttpServletResponse response, PageContext pageContext,
ModelMap implicitModel) throws Exception {
// Method handlerMethodToInvoke =
// BridgeMethodResolver.findBridgedMethod(handlerMethod);
try {
boolean debug = logger.isDebugEnabled();
// for (Method attributeMethod :
// this.methodResolver.getModelAttributeMethods()) {
// Method attributeMethodToInvoke =
// BridgeMethodResolver.findBridgedMethod(attributeMethod);
// Object[] args = resolveHandlerArguments(attributeMethodToInvoke,
// handler, webRequest,pageContext, implicitModel);
// if (debug) {
// logger.debug("Invoking model attribute method: " +
// attributeMethodToInvoke);
// }
// Object attrValue = doInvokeMethod(attributeMethodToInvoke,
// handler, args);
// String attrName =
// AnnotationUtils.findAnnotation(attributeMethodToInvoke,
// org.frameworkset.util.annotations.ModelAttribute.class).name();
// if ("".equals(attrName)) {
// Class resolvedType =
// GenericTypeResolver.resolveReturnType(attributeMethodToInvoke,
// handler.getClass());
// attrName =
// Conventions.getVariableNameForReturnType(attributeMethodToInvoke,
// resolvedType, attrValue);
// }
// implicitModel.addAttribute(attrName, attrValue);
// }
// System.out.println("_________________"+request.getMethod());
/**
* HttpServletRequest request, HttpServletResponse
* response,PageContext pageContext, MethodData handlerMethod,
* ModelMap model,Validator[] validators
*/
if(handlerMethod.getMethodInfo().isPagerMethod())//
{
AbstractUrlHandlerMapping.exposeAttribute(HandlerMapping.PAGER_METHOD_FLAG_ATTRIBUTE, new Boolean(true), request);
if(!handlerMethod.getMethodInfo().isDefinePageSize())
{
String cookieid = RequestContext.getPagerSizeCookieID(request, null);
int defaultSize = RequestContext.getPagerSize(request, HandlerMapping.DEFAULT_PAGE_SIZE,cookieid);
AbstractUrlHandlerMapping.exposeAttribute(HandlerMapping.PAGER_PAGESIZE_FLAG_ATTRIBUTE, new Integer(defaultSize), request);
AbstractUrlHandlerMapping.exposeAttribute(org.frameworkset.web.servlet.HandlerMapping.PAGER_COOKIEID_ATTRIBUTE,
cookieid, request);
AbstractUrlHandlerMapping.exposeAttribute(org.frameworkset.web.servlet.HandlerMapping.PAGER_CUSTOM_PAGESIZE_ATTRIBUTE,
HandlerMapping.DEFAULT_PAGE_SIZE, request);
}
}
Object[] args = HandlerUtils.buildMethodCallArgs(request, response,
pageContext, handlerMethod, implicitModel, null,messageConverters);
// Object[] args = resolveHandlerArguments(handlerMethodToInvoke,
// handler, webRequest, pageContext,implicitModel);
if (debug) {
logger.debug("Invoking request handler method: "
+ handlerMethod.getMethodInfo().getMethod());
}
if(!implicitModel.hasErrors())//没有数据绑定错误
{
return doInvokeMethod(handlerMethod.getMethodInfo().getMethod(),
handler, args);
}
else//有绑定数据错误
{
return doInvokeMethod(handlerMethod.getMethodInfo().getMethod(),
handler, args);
}
} catch (IllegalStateException ex) {
// Throw exception with full handler method context...
throw new HandlerMethodInvocationException(handlerMethod
.getMethodInfo().getMethod(), ex);
}
catch (InvocationTargetException ex) {
// The handler method threw an exception.
return handleException(handler,request, response, pageContext, ex.getTargetException(),implicitModel);
}
catch (Exception ex) {
// The binding process threw an exception.
return handleException(handler,request, response, pageContext, ex,implicitModel);
}
finally
{
if(handlerMethod.getMethodInfo().isPagerMethod())
{
// AbstractUrlHandlerMapping.removeAttribute(HandlerMapping.PAGER_METHOD_FLAG_ATTRIBUTE, request);
// AbstractUrlHandlerMapping.removeAttribute(HandlerMapping.PAGER_PAGESIZE_FLAG_ATTRIBUTE, request);
// AbstractUrlHandlerMapping.removeAttribute(HandlerMapping.PAGER_COOKIEID_ATTRIBUTE, request);
}
}
}
/**
* We've encountered an exception thrown from a handler method.
* Invoke an appropriate exception handler method, if any.
* @param request current HTTP request
* @param response current HTTP response
* @param ex the exception that got thrown
* @return a ModelAndView to render the response
*/
private Object handleException(HandlerMeta delegate,HttpServletRequest request, HttpServletResponse response, PageContext pageContext, Throwable ex,ModelMap implicitModel)
throws Exception {
Method handler = methodResolver.getExceptionHandler(ex);
if (handler != null) {
{
logger.debug("Invoking exception handler [" + handler + "] for exception: " + ex);
}
try {
Object returnValue = handler.invoke(delegate.getHandler(), request, response,pageContext, ex,implicitModel);
return returnValue;
// return massageReturnValueIfNecessary(returnValue);
}
catch (InvocationTargetException ex2) {
logger.error("Original exception overridden by exception handling failure", ex);
ReflectionUtils.rethrowException(ex2.getTargetException());
}
catch (Exception ex2) {
logger.error("Failed to invoke exception handler method", ex2);
}
}
else {
// If we get here, there was no custom handler or we couldn't invoke it.
ReflectionUtils.rethrowException(ex);
}
throw new IllegalStateException("Should never get here");
}
/**
* Determine whether the given value qualifies as a "binding candidate",
* i.e. might potentially be subject to bean-style data binding later on.
*/
protected boolean isBindingCandidate(Object value) {
return (value != null && !value.getClass().isArray()
&& !(value instanceof Collection) && !(value instanceof Map) && !BeanUtils
.isSimpleValueType(value.getClass()));
}
private Object doInvokeMethod(Method method, HandlerMeta target, Object[] args)
throws Exception {
ReflectionUtils.makeAccessible(method);
try {
return method.invoke(target.getHandler(), args);
} catch (InvocationTargetException ex) {
if(logger.isDebugEnabled())
{
try {
StringBuilder b = new StringBuilder();
b.append("args:");
if(args != null && args.length > 0)
{
int i = 0;
for(Object arg:args)
{
b.append("arg[").append(i).append("]=").append(arg).append("\n");
i ++;
}
}
logger.debug(b.toString());
} catch (Exception e) {
}
}
ReflectionUtils.rethrowException(ex.getTargetException());
}
catch (IllegalArgumentException ex) {
if(logger.isDebugEnabled())
{
try {
StringBuilder b = new StringBuilder();
b.append("args:");
if(args != null && args.length > 0)
{
int i = 0;
for(Object arg:args)
{
b.append("arg[").append(i).append("]=").append(arg).append("\n");
i ++;
}
}
logger.debug(b.toString());
} catch (Exception e) {
}
}
ReflectionUtils.rethrowException(ex);
}
throw new IllegalStateException("Should never get here");
}
protected void raiseMissingParameterException(String paramName,
Class paramType) throws Exception {
throw new IllegalStateException("Missing parameter '" + paramName
+ "' of type [" + paramType.getName() + "]");
}
protected void raiseSessionRequiredException(String message)
throws Exception {
throw new IllegalStateException(message);
}
// protected WebDataBinder createBinder(NativeWebRequest webRequest,
// Object target, String objectName) throws Exception {
//
// return new ServletRequestDataBinder(target, objectName);
// }
protected HttpMessageConverter[] getMessageConverters() {
return messageConverters;
}
// /**
// * Create a new binder instance for the given command and request.
// * Called by bind. Can be overridden to plug in custom
// * ServletRequestDataBinder subclasses.
// *
The default implementation creates a standard
// ServletRequestDataBinder,
// * and invokes initBinder. Note that initBinder
// * will not be invoked if you override this method!
// * @param request current HTTP request
// * @param command the command to bind onto
// * @return the new binder instance
// * @throws Exception in case of invalid state or arguments
// * @see #bind
// * @see #initBinder
// */
// protected ServletRequestDataBinder createBinder(HttpServletRequest
// request, Object command) throws Exception {
// ServletRequestDataBinder binder = new ServletRequestDataBinder(command,
// getCommandName(command));
// initBinder(request, binder);
// return binder;
// }
// /**
// * Return the command name to use for the given command object.
// *
Default is "command".
// * @param command the command object
// * @return the command name to use
// * @see #DEFAULT_COMMAND_NAME
// */
// protected String getCommandName(Object command) {
// return DEFAULT_COMMAND_NAME;
// }
//
// /** Default command name used for binding command objects: "command" */
// public static final String DEFAULT_COMMAND_NAME = "command";
}