Added AsyncDelayHandler example

examples/embedded/pom.xml

@@ -76,6 +76,16 @@
       <artifactId>jetty-proxy</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-jaas</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>org.eclipse.jetty</groupId>
+      <artifactId>jetty-plus</artifactId>
+      <version>${project.version}</version>
+    </dependency>
     <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>apache-jsp</artifactId>

examples/embedded/src/main/java/org/eclipse/jetty/embedded/LikeJettyXml.java

@@ -34,6 +34,7 @@ import org.eclipse.jetty.server.SecureRequestCustomizer;
 import org.eclipse.jetty.server.Server;
 import org.eclipse.jetty.server.ServerConnector;
 import org.eclipse.jetty.server.SslConnectionFactory;
+import org.eclipse.jetty.server.handler.AsyncDelayHandler;
 import org.eclipse.jetty.server.handler.ContextHandlerCollection;
 import org.eclipse.jetty.server.handler.DefaultHandler;
 import org.eclipse.jetty.server.handler.HandlerCollection;
@@ -42,6 +43,7 @@ import org.eclipse.jetty.server.handler.StatisticsHandler;
 import org.eclipse.jetty.util.ssl.SslContextFactory;
 import org.eclipse.jetty.util.thread.QueuedThreadPool;
 import org.eclipse.jetty.util.thread.ScheduledExecutorScheduler;
+import org.eclipse.jetty.webapp.Configuration;
 
 public class LikeJettyXml
 {
@@ -142,7 +144,11 @@ public class LikeJettyXml
 
         deployer.addAppProvider(webapp_provider);
         server.addBean(deployer);
-
+        
+        // === setup jetty plus ==
+        Configuration.ClassList.setServerDefault(server)
+        .addAfter("org.eclipse.jetty.webapp.FragmentConfiguration",
+                  "org.eclipse.jetty.plus.webapp.EnvConfiguration","org.eclipse.jetty.plus.webapp.PlusConfiguration");
 
         // === jetty-stats.xml ===
         StatisticsHandler stats = new StatisticsHandler();
@@ -182,7 +188,6 @@ public class LikeJettyXml
         login.setRefreshInterval(0);
         server.addBean(login);
 
-
         // Start the server
         server.start();
         server.join();

jetty-server/src/main/java/org/eclipse/jetty/server/handler/AsyncDelayHandler.java

@@ -0,0 +1,153 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.server.handler;
+
+import java.io.IOException;
+
+import javax.servlet.AsyncContext;
+import javax.servlet.DispatcherType;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.server.Request;
+
+
+/* ------------------------------------------------------------ */
+/** A handler wrapper that provides the framework to asynchronously
+ * delay the handling of a request.  While it uses standard servlet 
+ * API for asynchronous servlets, it adjusts the dispatch type of the 
+ * request so that it does not appear to be asynchronous during the
+ * delayed dispatch.
+ * 
+ */
+public class AsyncDelayHandler extends HandlerWrapper
+{
+    public final static String AHW_ATTR = "o.e.j.s.h.AsyncHandlerWrapper";
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
+    {
+        if (!isStarted() || _handler==null)
+            return;
+        
+        // Get the dispatcher types
+        DispatcherType ctype = baseRequest.getDispatcherType();
+        DispatcherType dtype = (DispatcherType)baseRequest.getAttribute(AHW_ATTR);
+        Object async_context_path=null;
+        Object async_path_info=null;
+        Object async_query_string=null;
+        Object async_request_uri=null;
+        Object async_servlet_path=null;
+        
+        // Is this request a restarted one?
+        boolean restart=false;
+        if (dtype!=null)
+        {
+            // fake the dispatch type to the original
+            baseRequest.setAttribute(AHW_ATTR,null);
+            baseRequest.setDispatcherType(dtype);
+            restart=true;
+            
+            async_context_path=baseRequest.getAttribute(AsyncContext.ASYNC_CONTEXT_PATH);
+            baseRequest.setAttribute(AsyncContext.ASYNC_CONTEXT_PATH,null);
+            async_path_info=baseRequest.getAttribute(AsyncContext.ASYNC_PATH_INFO);
+            baseRequest.setAttribute(AsyncContext.ASYNC_PATH_INFO,null);
+            async_query_string=baseRequest.getAttribute(AsyncContext.ASYNC_QUERY_STRING);
+            baseRequest.setAttribute(AsyncContext.ASYNC_QUERY_STRING,null);
+            async_request_uri=baseRequest.getAttribute(AsyncContext.ASYNC_REQUEST_URI);
+            baseRequest.setAttribute(AsyncContext.ASYNC_REQUEST_URI,null);
+            async_servlet_path=baseRequest.getAttribute(AsyncContext.ASYNC_SERVLET_PATH);
+            baseRequest.setAttribute(AsyncContext.ASYNC_SERVLET_PATH,null);
+        }
+        
+        // Should we handle this request now?
+        if (!startHandling(baseRequest,restart))
+        {
+            // No, so go async and remember dispatch type
+            AsyncContext context = baseRequest.startAsync();
+            baseRequest.setAttribute(AHW_ATTR,ctype);
+
+            delayHandling(baseRequest, context);
+            return;
+        }
+
+        // Handle the request
+        try
+        {
+            _handler.handle(target,baseRequest, request, response);
+        }
+        finally
+        {
+            if(restart)
+            {
+                // reset the request
+                baseRequest.setDispatcherType(ctype);
+                baseRequest.setAttribute(AsyncContext.ASYNC_CONTEXT_PATH,async_context_path);
+                baseRequest.setAttribute(AsyncContext.ASYNC_PATH_INFO,async_path_info);
+                baseRequest.setAttribute(AsyncContext.ASYNC_QUERY_STRING,async_query_string);
+                baseRequest.setAttribute(AsyncContext.ASYNC_REQUEST_URI,async_request_uri);
+                baseRequest.setAttribute(AsyncContext.ASYNC_SERVLET_PATH,async_servlet_path);
+            }
+            
+            // signal the request is leaving the handler
+            endHandling(baseRequest);
+        }
+        
+    }
+    
+    /* ------------------------------------------------------------ */
+    /** Called to indicate that a request has been presented for handling
+     * @param request The request to handle
+     * @param restart True if this request is being restarted after a delay
+     * @return True if the request should be handled now
+     */
+    protected boolean startHandling(Request request, boolean restart)
+    {
+        return true;
+    }
+
+    /* ------------------------------------------------------------ */
+    /** Called to indicate that a requests handling is being delayed/
+     * The implementation should arrange for context.dispatch() to be
+     * called when the request should be handled.  It may also set
+     * timeouts on the context. 
+     * 
+     * @param request The request to be delayed
+     * @param context The AsyncContext of the delayed request
+     */
+    protected void delayHandling(Request request,AsyncContext context)
+    {
+        context.dispatch();
+    }
+    
+    /* ------------------------------------------------------------ */
+    /** Called to indicated the handling of the request is ending.
+     * This is only the end of the current dispatch of the request and
+     * if the request is asynchronous, it may be handled again.
+     * @param request The request
+     */
+    protected void endHandling(Request request)
+    {
+        
+    }
+    
+    
+}