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authorGreg Wilkins2014-10-22 18:11:27 -0400
committerGreg Wilkins2014-10-22 18:11:27 -0400
commit627ba945f1680fad5f77dccd29f02cef5c31a40a (patch)
treec8eeea41117bb30c3b1ced7afde9526808166f0f /jetty-server
parent0eade706a65920ccdc28c12cfa3c1b94afd26736 (diff)
downloadorg.eclipse.jetty.project-627ba945f1680fad5f77dccd29f02cef5c31a40a.tar.gz
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Added AsyncDelayHandler example
Diffstat (limited to 'jetty-server')
-rw-r--r--jetty-server/src/main/java/org/eclipse/jetty/server/handler/AsyncDelayHandler.java153
1 files changed, 153 insertions, 0 deletions
diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/handler/AsyncDelayHandler.java b/jetty-server/src/main/java/org/eclipse/jetty/server/handler/AsyncDelayHandler.java
new file mode 100644
index 0000000000..82ad9142e1
--- /dev/null
+++ b/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)
+ {
+
+ }
+
+
+}

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