CounterFormController


1   /*
2   @COPYRIGHT@
3   */
4   package demo.events.web;
5   
6   import java.util.HashMap  ;
7   import java.util.Map  ;
8   
9   import javax.servlet.http.HttpServletRequest  ;
10  import javax.servlet.http.HttpServletResponse  ;
11  
12  import org.springframework.context.ApplicationContext;
13  import org.springframework.web.bind.RequestUtils;
14  import org.springframework.web.servlet.ModelAndView;
15  import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
16  
17  import demo.events.EventProcessor;
18  import demo.events.MessageEvent;
19  
20  /**
21   * Web controller for the Events sample application; provides the list of current messages and publishes new messages as
22   * events to the {@link ApplicationContext}, which is distributed by Terracotta for Spring.
23   * 
24   * @author Eugene Kuleshov
25   */
26  public class CounterFormController extends MultiActionController {
27  
28    private transient EventProcessor eventProcessor;
29  
30    public void setEventProcessor(EventProcessor eventProcessor) {
31      this.eventProcessor = eventProcessor;
32    }
33  
34    /**
35     * Controller method to handle refresh action
36     */
37    public ModelAndView handleRefresh(HttpServletRequest   request, HttpServletResponse   response) throws Exception   {
38      Map   model = new HashMap  ();
39      model.put("events", eventProcessor.getEvents());
40      return new ModelAndView("index", model);
41    }
42  
43    /**
44     * Controller method to handle message submission action
45     */
46    public ModelAndView handleMessage(HttpServletRequest   request, HttpServletResponse   response) throws Exception   {
47      String   message = RequestUtils.getRequiredStringParameter(request, "message");
48      String   sender = RequestUtils.getRequiredStringParameter(request, "sender");
49  
50      ApplicationContext ctx = getApplicationContext();
51      ctx.publishEvent(new MessageEvent(sender, message));
52  
53      return new ModelAndView("redirect:index.jsp", null);
54    }
55  
56  }
57
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