WebRequest abstraction.
This interface assumes MVC-style request processing: A handler gets executed, exposes a set of model objects, then a view gets rendered based on that model. Alternatively, a handler may also process the request completely, with no view to be rendered.
In an async processing scenario, the handler may be executed in a separate
thread while the main thread exits without rendering or invoking the
postHandle and afterCompletion callbacks. When concurrent
handler execution completes, the request is dispatched back in order to
proceed with rendering the model and all methods of this contract are invoked
again. For further options and comments see
org.springframework.web.context.request.async.AsyncWebRequestInterceptor
This interface is deliberately minimalistic to keep the dependencies of generic request interceptors as minimal as feasible.
ServletWebRequest, org.springframework.web.servlet.DispatcherServlet , org.springframework.web.servlet.handler.AbstractHandlerMapping#setInterceptors , org.springframework.web.servlet.HandlerInterceptor
| Modifier and Type | Method and Description |
|---|---|
| public void | afterCompletion(WebRequest
the current web request request, Exception exception thrown on handler execution, if any ex)Callback after completion of request processing, that is, after rendering the view. |
| public void | postHandle(WebRequest
the current web request request, ModelMap the map of model objects that will be exposed to the view
(may be model)null). Can be used to analyze the exposed model
and/or to add further model attributes, if desired.Intercept the execution of a request handler after its successful invocation, right before view rendering (if any). |
| public void | preHandle(WebRequest
the current web request request)Intercept the execution of a request handler before its invocation. |
| afterCompletion | back to summary |
|---|---|
| public void afterCompletion(WebRequest request, Exception ex) throws Exception 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
| |
| postHandle | back to summary |
|---|---|
| public void postHandle(WebRequest request, ModelMap model) throws Exception Intercept the execution of a request handler after its successful invocation, right before view rendering (if any). Allows for modifying context resources after successful handler execution (for example, flushing a Hibernate Session).
| |
| preHandle | back to summary |
|---|---|
| public void preHandle(WebRequest request) throws Exception Intercept the execution of a request handler before its invocation. Allows for preparing context resources (such as a Hibernate Session) and expose them as request attributes or as thread-local objects.
| |