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Added AsyncDelayHandler example

This commit is contained in:
Greg Wilkins 2014-10-23 09:11:27 +11:00
parent 0eade706a6
commit 627ba945f1
3 changed files with 170 additions and 2 deletions
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10
examples/embedded/pom.xml
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@ -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>

9
examples/embedded/src/main/java/org/eclipse/jetty/embedded/LikeJettyXml.java
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@ -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();

153
jetty-server/src/main/java/org/eclipse/jetty/server/handler/AsyncDelayHandler.java Normal file
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@ -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)
{
}
}