Importing upstream Jetty jetty-9.2.1.v20140609

[gigi.git] / lib / jetty / org / eclipse / jetty / server / handler / HotSwapHandler.java

diff --git a/lib/jetty/org/eclipse/jetty/server/handler/HotSwapHandler.java b/lib/jetty/org/eclipse/jetty/server/handler/HotSwapHandler.java
new file mode 100644 (file)
index 0000000..162a719
--- /dev/null
+++ b/lib/jetty/org/eclipse/jetty/server/handler/HotSwapHandler.java
@@ -0,0 +1,160 @@
+//
+//  ========================================================================
+//  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 java.util.List;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.server.Handler;
+import org.eclipse.jetty.server.Request;
+import org.eclipse.jetty.server.Server;
+
+/* ------------------------------------------------------------ */
+/**
+ * A <code>HandlerContainer</code> that allows a hot swap of a wrapped handler.
+ *
+ */
+public class HotSwapHandler extends AbstractHandlerContainer
+{
+    private volatile Handler _handler;
+
+    /* ------------------------------------------------------------ */
+    /**
+     *
+     */
+    public HotSwapHandler()
+    {
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the handlers.
+     */
+    public Handler getHandler()
+    {
+        return _handler;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return Returns the handlers.
+     */
+    @Override
+    public Handler[] getHandlers()
+    {
+        return new Handler[]
+        { _handler };
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @param handler
+     *            Set the {@link Handler} which should be wrapped.
+     */
+    public void setHandler(Handler handler)
+    {
+        if (handler == null)
+            throw new IllegalArgumentException("Parameter handler is null.");
+        try
+        {
+            updateBean(_handler,handler);
+            _handler=handler;
+            Server server = getServer();
+            handler.setServer(server);
+
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /* ------------------------------------------------------------ */
+    /*
+     * @see org.eclipse.thread.AbstractLifeCycle#doStart()
+     */
+    @Override
+    protected void doStart() throws Exception
+    {
+        super.doStart();
+    }
+
+    /* ------------------------------------------------------------ */
+    /*
+     * @see org.eclipse.thread.AbstractLifeCycle#doStop()
+     */
+    @Override
+    protected void doStop() throws Exception
+    {
+        super.doStop();
+    }
+
+    /* ------------------------------------------------------------ */
+    /*
+     * @see org.eclipse.jetty.server.server.EventHandler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
+     */
+    @Override
+    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
+    {
+        if (_handler != null && isStarted())
+        {
+            _handler.handle(target,baseRequest,request,response);
+        }
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void setServer(Server server)
+    {
+        if (isRunning())
+            throw new IllegalStateException(RUNNING);
+
+        super.setServer(server);
+
+        Handler h = getHandler();
+        if (h != null)
+            h.setServer(server);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    protected void expandChildren(List<Handler> list, Class<?> byClass)
+    {
+        expandHandler(_handler,list,byClass);
+    }
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public void destroy()
+    {
+        if (!isStopped())
+            throw new IllegalStateException("!STOPPED");
+        Handler child = getHandler();
+        if (child != null)
+        {
+            setHandler(null);
+            child.destroy();
+        }
+        super.destroy();
+    }
+}