org.springframework.web.servlet.handler

Class WebRequestHandlerInterceptorAdapter

java.lang.Object

org.springframework.web.servlet.handler.WebRequestHandlerInterceptorAdapter

All Implemented Interfaces:

AsyncHandlerInterceptor, HandlerInterceptor

public class WebRequestHandlerInterceptorAdapter
extends Object
implements AsyncHandlerInterceptor

Adapter that implements the Servlet HandlerInterceptor interface and wraps an underlying WebRequestInterceptor.

Since:

2.0

Author:

Juergen Hoeller

See Also:

WebRequestInterceptor, HandlerInterceptor

Constructor Summary

Constructors

Constructor and Description
WebRequestHandlerInterceptorAdapter(WebRequestInterceptor requestInterceptor) Create a new WebRequestHandlerInterceptorAdapter for the given WebRequestInterceptor.

Method Summary

Modifier and Type	Method and Description
void	afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) Callback after completion of request processing, that is, after rendering the view.
void	afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) Called instead of postHandle and afterCompletion when the handler is being executed concurrently.
void	postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) Intercept the execution of a handler.
boolean	preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) Intercept the execution of a handler.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WebRequestHandlerInterceptorAdapter

public WebRequestHandlerInterceptorAdapter(WebRequestInterceptor requestInterceptor)

Create a new WebRequestHandlerInterceptorAdapter for the given WebRequestInterceptor.

Parameters:

requestInterceptor - the WebRequestInterceptor to wrap

Method Detail

preHandle

public boolean preHandle(HttpServletRequest request,
                         HttpServletResponse response,
                         Object handler)
                  throws Exception

Description copied from interface: HandlerInterceptor

Intercept the execution of a handler. Called after HandlerMapping determined an appropriate handler object, but before HandlerAdapter invokes the handler.

DispatcherServlet processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. With this method, each interceptor can decide to abort the execution chain, typically sending an HTTP error or writing a custom response.

Note: special considerations apply for asynchronous request processing. For more details see AsyncHandlerInterceptor.

The default implementation returns true.

Specified by:

preHandle in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - chosen handler to execute, for type and/or instance evaluation

Returns:

true if the execution chain should proceed with the next interceptor or the handler itself. Else, DispatcherServlet assumes that this interceptor has already dealt with the response itself.

Throws:

Exception - in case of errors

postHandle

public void postHandle(HttpServletRequest request,
                       HttpServletResponse response,
                       Object handler,
                       @Nullable
                       ModelAndView modelAndView)
                throws Exception

Description copied from interface: HandlerInterceptor

Intercept the execution of a handler. Called after HandlerAdapter actually invoked the handler, but before the DispatcherServlet renders the view. Can expose additional model objects to the view via the given ModelAndView.

DispatcherServlet processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. With this method, each interceptor can post-process an execution, getting applied in inverse order of the execution chain.

Note: special considerations apply for asynchronous request processing. For more details see AsyncHandlerInterceptor.

The default implementation is empty.

Specified by:

postHandle in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - the handler (or HandlerMethod) that started asynchronous execution, for type and/or instance examination

modelAndView - the ModelAndView that the handler returned (can also be null)

Throws:

Exception - in case of errors

afterCompletion

public void afterCompletion(HttpServletRequest request,
                            HttpServletResponse response,
                            Object handler,
                            @Nullable
                            Exception ex)
                     throws Exception

Description copied from interface: HandlerInterceptor

Callback after completion of request processing, that is, after rendering the view. Will be called on any outcome of handler execution, thus allows for proper resource cleanup.

Note: Will only be called if this interceptor's preHandle method has successfully completed and returned true!

As with the postHandle method, the method will be invoked on each interceptor in the chain in reverse order, so the first interceptor will be the last to be invoked.

Note: special considerations apply for asynchronous request processing. For more details see AsyncHandlerInterceptor.

The default implementation is empty.

Specified by:

afterCompletion in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - the handler (or HandlerMethod) that started asynchronous execution, for type and/or instance examination

ex - any exception thrown on handler execution, if any; this does not include exceptions that have been handled through an exception resolver

Throws:

Exception - in case of errors

afterConcurrentHandlingStarted

public void afterConcurrentHandlingStarted(HttpServletRequest request,
                                           HttpServletResponse response,
                                           Object handler)

Description copied from interface: AsyncHandlerInterceptor

Called instead of postHandle and afterCompletion when the handler is being executed concurrently.

Implementations may use the provided request and response but should avoid modifying them in ways that would conflict with the concurrent execution of the handler. A typical use of this method would be to clean up thread-local variables.

Specified by:

afterConcurrentHandlingStarted in interface AsyncHandlerInterceptor

Parameters:

request - the current request

response - the current response

handler - the handler (or HandlerMethod) that started async execution, for type and/or instance examination