java/src/main/com/google/appengine/tools/development/BackendServers.java

   1 // Copyright 2011 Google Inc. All Rights Reserved.
   2
   3 package com.google.appengine.tools.development;
   4
   5 import com.google.common.annotations.VisibleForTesting;
   6
   7 import org.mortbay.jetty.webapp.WebAppContext;
   8
   9 import java.io.IOException;
  10
  11 import javax.servlet.RequestDispatcher;
  12 import javax.servlet.ServletException;
  13 import javax.servlet.http.HttpServletRequest;
  14 import javax.servlet.http.HttpServletResponse;
  15
  16 /**
  17  * Controls backend servers configured in appengine-web.xml. Each server is
  18  * started on a separate port. All servers run the same code as the main app.
  19  *
  20  *
  21  */
  22 public class BackendServers extends AbstractBackendServers {
  23
  24   private static BackendServers instance = new BackendServers();
  25
  26   public static BackendServers getInstance() {
  27     return instance;
  28   }
  29
  30   @VisibleForTesting
  31   BackendServers() {
  32   }
  33   /**
  34    * Forward a request to a specific server and instance. This will call the
  35    * specified instance request dispatcher so the request is handled in the
  36    * right server context.
  37    */
  38   @Override
  39   protected void forwardToServer(String requestedServer, int instance, HttpServletRequest hrequest,
  40       HttpServletResponse hresponse) throws IOException, ServletException {
  41     ServerWrapper server = getServerWrapper(requestedServer, instance);
  42     logger.finest("forwarding request to server: " + server);
  43     WebAppContext jettyContext =
  44         (WebAppContext) server.getContainer().getAppContext().getContainerContext();
  45     RequestDispatcher requestDispatcher =
  46         jettyContext.getServletContext().getRequestDispatcher(hrequest.getRequestURI());
  47     requestDispatcher.forward(hrequest, hresponse);
  48   }
  49 }