AnnotationMethodHandlerAdapter.java 文件源码

@Override
public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
        throws Exception {

    Class<?> clazz = ClassUtils.getUserClass(handler);
    Boolean annotatedWithSessionAttributes = this.sessionAnnotatedClassesCache.get(clazz);
    if (annotatedWithSessionAttributes == null) {
        annotatedWithSessionAttributes = (AnnotationUtils.findAnnotation(clazz, SessionAttributes.class) != null);
        this.sessionAnnotatedClassesCache.put(clazz, annotatedWithSessionAttributes);
    }

    if (annotatedWithSessionAttributes) {
        checkAndPrepare(request, response, this.cacheSecondsForSessionAttributeHandlers, true);
    }
    else {
        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, handler);
            }
        }
    }

    return invokeHandlerMethod(request, response, handler);
}