public class RequestMappingHandlerAdapter extends AbstractHandlerMethodAdapter implements BeanFactoryAware,
InitializingBean {
.....
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 invokeHandlerMethod(request, response, handlerMethod);
}
}
}
return invokeHandlerMethod(request, response, handlerMethod);
}
private ModelAndView invokeHandlerMethod(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);
requestMappingMethod.invokeAndHandle(webRequest, mavContainer);
modelFactory.updateModel(webRequest, mavContainer);
if (mavContainer.isRequestHandled()) {
return null;
}
else {
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();
RequestContextUtils.getOutputFlashMap(request).putAll(flashAttributes);
}
return mav;
}
}
.....
}
public class ServletInvocableHandlerMethod extends InvocableHandlerMethod {
.......
public final void invokeAndHandle(
NativeWebRequest request, ModelAndViewContainer mavContainer,
Object... providedArgs) throws Exception {
Object returnValue = invokeForRequest(request, mavContainer, providedArgs);
setResponseStatus((ServletWebRequest) request);
if (returnValue == null) {
if (isRequestNotModified(request) || hasResponseStatus() || mavContainer.isRequestHandled()) {
mavContainer.setRequestHandled(true);
return;
}
}
mavContainer.setRequestHandled(false);
try {
returnValueHandlers.handleReturnValue(returnValue, getReturnType(), mavContainer, request);
} catch (Exception ex) {
if (logger.isTraceEnabled()) {
logger.trace(getReturnValueHandlingErrorMessage("Error handling return value", returnValue), ex);
}
throw ex;
}
}
.......
}
public class HandlerMethodReturnValueHandlerComposite implements HandlerMethodReturnValueHandler {
...
public void handleReturnValue(
Object returnValue, MethodParameter returnType,
ModelAndViewContainer mavContainer, NativeWebRequest webRequest)
throws Exception {
HandlerMethodReturnValueHandler handler = getReturnValueHandler(returnType);
Assert.notNull(handler, "Unknown return value type [" + returnType.getParameterType().getName() + "]");
handler.handleReturnValue(returnValue, returnType, mavContainer, webRequest);
}
...
}
public class ViewNameMethodReturnValueHandler implements HandlerMethodReturnValueHandler {
...
public void handleReturnValue(
Object returnValue, MethodParameter returnType,
ModelAndViewContainer mavContainer, NativeWebRequest webRequest)
throws Exception {
if (returnValue == null) {
return;
}
else if (returnValue instanceof String) {
String viewName = (String) returnValue;
mavContainer.setViewName(viewName);
if (isRedirectViewName(viewName)) {
mavContainer.setRedirectModelScenario(true);
}
}
else {
// should not happen
throw new UnsupportedOperationException("Unexpected return type: " +
returnType.getParameterType().getName() + " in method: " + returnType.getMethod());
}
}
/**
* Whether the given view name is a redirect view reference.
* @param viewName the view name to check, never {@code null}
* @return "true" if the given view name is recognized as a redirect view
* reference; "false" otherwise.
*/
protected boolean isRedirectViewName(String viewName) {
return viewName.startsWith("redirect:");
}
...
}
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