/*
* Copyright 2002-2017 the original author or authors.
*
* 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.springframework.web.context.request;
/**
* Extends {@code WebRequestInterceptor} with a callback method invoked during
* asynchronous request handling.
*
* <p>When a handler starts asynchronous request handling, the DispatcherServlet
* exits without invoking {@code postHandle} and {@code afterCompletion}, as it
* normally does, since the results of request handling (e.g. ModelAndView) are
* not available in the current thread and handling is not yet complete.
* In such scenarios, the {@link #afterConcurrentHandlingStarted(WebRequest)}
* method is invoked instead allowing implementations to perform tasks such as
* cleaning up thread bound attributes.
*
* <p>When asynchronous handling completes, the request is dispatched to the
* container for further processing. At this stage the DispatcherServlet invokes
* {@code preHandle}, {@code postHandle} and {@code afterCompletion} as usual.
*
* @author Rossen Stoyanchev
* @since 3.2
*
* @see org.springframework.web.context.request.async.WebAsyncManager
*/
public interface AsyncWebRequestInterceptor extends WebRequestInterceptor{
/**
* Called instead of {@code postHandle} and {@code afterCompletion}, when the
* handler started handling the request concurrently.
*
* @param request the current request
*/
void afterConcurrentHandlingStarted(WebRequest request);
}