LastModified


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.web.servlet.mvc;
18  
19  import javax.servlet.http.HttpServletRequest  ;
20  
21  /**
22   * Supports last-modified HTTP requests to facilitate content caching.
23   * Same contract as for the Servlet API's <code>getLastModified</code> method.
24   *
25   * <p>Delegated to by a HandlerAdapter's <code>getLastModified</code> implementation.
26   * By default, any Controller or HttpRequestHandler within Spring's default framework
27   * can implement this interface to enable last-modified checking.
28   *
29   * @author Rod Johnson
30   * @author Juergen Hoeller
31   * @see javax.servlet.http.HttpServlet#getLastModified
32   * @see Controller
33   * @see SimpleControllerHandlerAdapter
34   * @see org.springframework.web.HttpRequestHandler
35   * @see HttpRequestHandlerAdapter
36   */
37  public interface LastModified {
38      
39      /**
40       * Same contract as for HttpServlet's <code>getLastModified</code> method.
41       * Invoked <b>before</b> request processing.
42       * <p>The return value will be sent to the HTTP client as Last-Modified header,
43       * and compared with If-Modified-Since headers that the client sends back.
44       * The content will only get regenerated if there has been a modification.
45       * @param request current HTTP request
46       * @return the time the underlying resource was last modified, or -1
47       * meaning that the content must always be regenerated
48       * @see org.springframework.web.servlet.HandlerAdapter#getLastModified
49       * @see javax.servlet.http.HttpServlet#getLastModified
50       */
51      long getLastModified(HttpServletRequest   request);
52      
53  }
54
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