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Jetty example source code file (RandomConnector.java)

This example Jetty source code file (RandomConnector.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

buffer, bytechannel, context, exception, file, file, helloservlet, http, interruptedexception, interruptedexception, io, ioexception, ioexception, randomconnector, randomendpoint, randomendpoint, request, response, servlet, util

The Jetty RandomConnector.java source code

//========================================================================
// Copyright 2006 Mort Bay Consulting Pty. Ltd.
// expecting other bits copyrighted sun
//------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//========================================================================

package org.mortbay.jetty;


import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.channels.ByteChannel;
import java.nio.channels.ClosedChannelException;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.mortbay.io.Buffer;
import org.mortbay.io.EndPoint;
import org.mortbay.io.nio.ChannelEndPoint;
import org.mortbay.io.nio.NIOBuffer;
import org.mortbay.jetty.nio.AbstractNIOConnector;
import org.mortbay.jetty.servlet.Context;
import org.mortbay.jetty.servlet.ServletHolder;
import org.mortbay.log.Log;
import org.mortbay.util.ajax.Continuation;

/* ------------------------------------------------------------------------------- */
/**
 * @author gregw
 *
 */
public class RandomConnector extends AbstractNIOConnector 
{
    static Random random = new Random(System.currentTimeMillis());
    static int rate = 1;
    
    /* ------------------------------------------------------------------------------- */
    /**
     * Constructor.
     * 
     */
    public RandomConnector()
    {
    }


    
    /* ------------------------------------------------------------ */
    public Object getConnection()
    {
    	// TODO return private connection eg server socket
        return null;
    }
    


    /* ------------------------------------------------------------ */
    /*
     * @see org.mortbay.jetty.AbstractConnector#doStart()
     */
    protected void doStart() throws Exception
    {
        super.doStart();
    }

    /* ------------------------------------------------------------ */
    /*
     * @see org.mortbay.jetty.AbstractConnector#doStop()
     */
    protected void doStop() throws Exception
    {
        super.doStop();
    }


    /* ------------------------------------------------------------ */
    public void open() throws IOException
    {
    	// TODO Open server socket
    }

    /* ------------------------------------------------------------ */
    public void close() throws IOException
    {
    	// TODO Close server socket
    }

    /* ------------------------------------------------------------ */
    public void accept(int acceptorID) throws IOException
    {
        // TODO accept a connection for real or progress an existing one
        // but for now.... let's just pretend.
        
        // This creates a connection and runs it to completion.
        // in reality there will be lots of endpoints in play and any one
        // of them may need to be dispatched.
        
        try 
        {
            File file = new File("fakeRequests.txt");
            if (!file.exists())
                file = new File("modules/jetty/src/test/resources/fakeRequests.txt");
            if (!file.exists())
                file = new File("src/test/resources/fakeRequests.txt");
            if (!file.exists())
                file = new File("/tmp/fakeRequests.txt");
            if (!file.exists())
            {
                System.err.println("No such file "+file);
                System.exit(1);
            }
            
            Thread.sleep(random.nextInt(50*rate));
            
            ByteChannel channel = new FileInputStream(file).getChannel();
            RandomEndPoint gep = new RandomEndPoint(this,channel);
            
            try
            {
                // TODO in reality this dispatches would be mixed with others from other connections.
                while (gep.isOpen())
                {
                    Thread.sleep(random.nextInt(10*rate));
                    synchronized(gep)
                    {
                        if (!gep.dispatched)
                        { 
                            gep.dispatched=true;
                            getThreadPool().dispatch(gep);
                        }
                    }
                }
            }
            finally
            {
                connectionClosed(gep._connection);
            }
            
        } 
        catch (InterruptedException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }
    
    /* ------------------------------------------------------------------------------- */
    public void customize(EndPoint endpoint, Request request) throws IOException
    {
        super.customize(endpoint, request);
    }


    /* ------------------------------------------------------------------------------- */
    public int getLocalPort()
    {
    	// TODO return the actual port we are listening on
    	return 0;
    }
    

    /* ------------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------------- */
    public static class RandomEndPoint extends ChannelEndPoint implements EndPoint, Runnable
    {
        HttpConnection _connection;
        boolean dispatched=false;
        
        public RandomEndPoint(RandomConnector connector, ByteChannel channel)
        {
            super(channel);
            _connection = new HttpConnection(connector,this,connector.getServer());
            connector.connectionOpened(_connection);
        }

        public void run()
        {
            System.err.print("|");
            try
            {
                _connection.handle();
            }
            catch (ClosedChannelException e)
            {
                Log.ignore(e);
            }
            catch (EofException e)
            {
                Log.debug("EOF", e);
                try{close();}
                catch(IOException e2){Log.ignore(e2);}
            }
            catch (HttpException e)
            {
                Log.debug("BAD", e);
                try{close();}
                catch(IOException e2){Log.ignore(e2);}
            }
            catch (Throwable e)
            {
                Log.warn("handle failed", e);
                try{close();}
                catch(IOException e2){Log.ignore(e2);}
            }
            finally
            {
                Continuation continuation =  _connection.getRequest().getContinuation();
                if (continuation != null && continuation.isPending())
                {
                    // We have a continuation
                    // TODO something!
                }
                else
                {
                    synchronized (RandomEndPoint.this)
                    {
                        dispatched=false;
                    }
                    // something else... normally re-enable this connection is the selectset with the latest interested ops
                }
            }
        }

        public boolean blockReadable(long millisecs)
        {
            try {Thread.sleep(random.nextInt(10*rate));} catch (InterruptedException e) {e.printStackTrace();}
            return true;
        }

        public boolean blockWritable(long millisecs)
        {
            try {Thread.sleep(random.nextInt(10*rate));} catch (InterruptedException e) {e.printStackTrace();}
            return true;
        }

        public int fill(Buffer buffer) throws IOException
        {
            // sometimes read nothing
            if (random.nextInt()%10 <2 )
            {
                // System.err.println("fill: 0");
                return 0;
            }
                
            // Get a random amount of data
            int len=random.nextInt(20*rate);
            if (len>buffer.space())
                len=buffer.space();
            
            // Load a length limited slice via a temp buffer
            NIOBuffer temp= new NIOBuffer(len,false);
            int len2=super.fill(temp);
            if (len2<0)
            {
                // System.err.println("fill: EOF");
                return -1;
            }
            
            if (len!=len2)
                throw new IllegalStateException();
            temp.mark();
            buffer.put(temp);
            temp.reset();
            System.err.print(temp);
            buffer.skip(len);
            return len;
        }

        public int flush(Buffer header, Buffer buffer, Buffer trailer) throws IOException
        {
            int len=0;
            
            // TODO gather operation.
            if (header!=null && header.hasContent())
                len+=flush(header);
            
            if (header==null || !header.hasContent())
            {
                if (buffer!=null && buffer.hasContent())
                    len+=flush(buffer);
            }

            if (buffer==null || !buffer.hasContent())
            {
                if (trailer!=null && trailer.hasContent())
                    len+=flush(trailer);
            }
            
            return len;
            
        }

        public int flush(Buffer buffer) throws IOException
        {
            // sometimes flush nothing
            if (random.nextInt(10) <2 )
            {
                // System.err.println("flush:"+0);
                return 0;
            }

            // flush a random amount of data
            int len=random.nextInt(20*rate);
            if (len>buffer.length())
                len=buffer.length();
            
            // Load a length limited slice via a temp buffer
            Buffer temp= buffer.get(len);
            System.err.print(temp);
            return len;
        }

        public boolean isBlocking()
        {
            return false;
        }

        
    }
    
    public static void main(String[] arg)
        throws Exception
    {
        // Just a little test main....

        Server server = new Server();
        server.addConnector(new RandomConnector());
        Context context = new Context(server,"/",Context.SESSIONS);
        context.addServlet(new ServletHolder(new HelloServlet()), "/*");
        
        server.start();
        server.join();
    }
    
    public static class HelloServlet extends HttpServlet
    {
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
        {
            response.setContentType("text/html");
            response.setStatus(HttpServletResponse.SC_OK);
            PrintWriter out =  response.getWriter();
            out.println("<h1>Hello SimpleServlet: "+request.getRequestURI()+"
");
            int lines = random.nextInt(100);
            for (int i=0;i<lines;i++)
                out.println(i+" Blah blah blah. Now is the time for all good FSMs to work. Hoooo nooo broooon cooooo");
            out.println("</pre>");       
        }
    }

}

Other Jetty examples (source code examples)

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