Jetty example source code file (HttpConnection.java)

This example Jetty source code file (HttpConnection.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, buffer, endpoint, httpconnection, httpconnection, httpdestination, httpexchange, illegalstateexception, io, ioexception, ioexception, override, override, selectchannelendpoint, string, util

The Jetty HttpConnection.java source code

// ========================================================================
// Copyright 2006-2007 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.client;

import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.nio.channels.CancelledKeyException;
import java.util.Date;

import org.mortbay.io.Buffer;
import org.mortbay.io.Buffers;
import org.mortbay.io.ByteArrayBuffer;
import org.mortbay.io.Connection;
import org.mortbay.io.EndPoint;
import org.mortbay.io.nio.NIOBuffer;
import org.mortbay.io.nio.SelectChannelEndPoint;
import org.mortbay.jetty.HttpGenerator;
import org.mortbay.jetty.HttpHeaderValues;
import org.mortbay.jetty.HttpHeaders;
import org.mortbay.jetty.HttpParser;
import org.mortbay.jetty.HttpVersions;
import org.mortbay.log.Log;
import org.mortbay.thread.Timeout;


/**
 *
 * @author Greg Wilkins
 * @author Guillaume Nodet
 */
class HttpConnection implements Connection
{
    HttpDestination _destination;
    EndPoint _endp;
    HttpGenerator _generator;
    HttpParser _parser;
    boolean _http11=true;
    Buffer _connectionHeader;
    Buffer _requestContentChunk;
    long _last;
    boolean _requestComplete;
    

    Timeout.Task _timeout= new Timeout.Task()
    {
        public void expire()
        {
            HttpExchange ex=null;
            try
            {
                synchronized(HttpConnection.this)
                {
                    ex=_exchange;
                    _exchange=null;
                    if (ex!=null)
                        _destination.returnConnection(HttpConnection.this,true); 
                }
            }
            catch(Exception e)
            {
                Log.debug(e);
            }
            finally
            {
                try
                {
                    _endp.close();
                }
                catch (IOException e)
                {
                    Log.ignore(e);
                }
                
                if(ex.getStatus()<HttpExchange.STATUS_COMPLETED)
                {
                    ex.setStatus(HttpExchange.STATUS_EXPIRED);
                }
            }
        }

    };


    /* The current exchange waiting for a response */
    HttpExchange _exchange;  
    
    
    /* ------------------------------------------------------------ */
    HttpConnection(Buffers buffers,EndPoint endp,int hbs,int cbs)
    {
        _endp=endp;
        _generator=new HttpGenerator(buffers,endp,hbs,cbs);
        _parser=new HttpParser(buffers,endp,new Handler(),hbs,cbs);
    }

    /* ------------------------------------------------------------ */
    public HttpDestination getDestination()
    {
        return _destination;
    }

    /* ------------------------------------------------------------ */
    public void setDestination(HttpDestination destination)
    {
        _destination = destination;
    }

    /* ------------------------------------------------------------ */
    public boolean send(HttpExchange ex) throws IOException
    {
        synchronized(this)
        {
            if (_exchange!=null)
                throw new IllegalStateException(this+" PIPELINED!!!  _exchange="+_exchange);

            if (!_endp.isOpen())
                return false;

            ex.setStatus(HttpExchange.STATUS_WAITING_FOR_COMMIT);
            _exchange=ex;
            
            if (_endp.isBlocking())
                this.notify();
            else
            {
                SelectChannelEndPoint scep = (SelectChannelEndPoint)_endp;
                scep.scheduleWrite();
            }
            
            if (!_endp.isBlocking())
                _destination.getHttpClient().schedule(_timeout);
            
            return true;
        }
    }
        
    /* ------------------------------------------------------------ */
    public void handle() throws IOException
    {
        int no_progress=0;
        int flushed=0;
        
        
        while (_endp.isOpen())
        {
            synchronized(this)
            {
                while (_exchange==null)
                {
                    if (_endp.isBlocking())
                    {
                        try
                        {
                            this.wait();
                        }
                        catch (InterruptedException e)
                        {
                            throw new InterruptedIOException();
                        }
                    }
                    else
                    {
                        // Hopefully just space?
                        _parser.fill();
                        _parser.skipCRLF();
                        if (_parser.isMoreInBuffer())
                        {
                            Log.warn("unexpected data");
                            _endp.close();
                        }
                        
                        return;
                    }
                }
            }
            if (_exchange.getStatus()==HttpExchange.STATUS_WAITING_FOR_COMMIT)
            {
                no_progress=0;
                commitRequest();
            }
            
            try
            {
                long io=0;
                
                if (!_generator.isComplete())
                {
                    // Write as much of the request as possible
                    synchronized(this)
                    {
                        if (_exchange==null)
                            continue;
                        io=_generator.flush();
                        flushed+=io;
                    }
                    
                    if (!_generator.isComplete())
                    {
                        InputStream in = _exchange.getRequestContentSource();
                        if (in!=null)
                        {
                            if (_requestContentChunk==null || _requestContentChunk.length()==0)
                            {
                                _requestContentChunk=_exchange.getRequestContentChunk();
                                if (_requestContentChunk!=null)
                                    _generator.addContent(_requestContentChunk,false);
                                else
                                    _generator.complete();
                                io+=_generator.flush();
                            }
                        }
                        else
                            _generator.complete();
                    }
                }
                else if (!_requestComplete)
                {
                    _requestComplete=true;
                    _exchange.onRequestComplete();
                }

                // If we are not ended then parse available
                if (!_parser.isComplete() && _generator.isCommitted()) 
                {
                    long filled=_parser.parseAvailable();
                    io+=filled;
                }

                if (io>0)
                    no_progress=0;
                else if (no_progress++>=2 && !_endp.isBlocking())
                    return;
            }
            catch (IOException e)
            {
                synchronized(this)
                {
                    if (_exchange!=null)
                    {
                        _exchange.onException(e);
                        _exchange.setStatus(HttpExchange.STATUS_EXCEPTED);
                    }
                }
            }
            finally
            {
                if (_parser.isComplete() && _generator.isComplete())
                {  
                    
                    _destination.getHttpClient().cancel(_timeout);

                    synchronized(this)
                    {
                        boolean close=shouldClose();
                        reset(true);
                        no_progress=0;
                        flushed=-1;
                        if (_exchange!=null)
                        {
                            if (_exchange.getStatus()!=HttpExchange.STATUS_COMPLETED)
                            {
                                Log.warn("NOT COMPLETE! "+_exchange);
                                _exchange.setStatus(HttpExchange.STATUS_COMPLETED);
                            }
                            _exchange=null;
                            _destination.returnConnection(this, close); 
                            if (close)
                                return;
                        }
          
                    }
                }
            }
        }
    }
    
    /* ------------------------------------------------------------ */
    public boolean isIdle()
    {
        synchronized(this)
        {
            return _exchange == null;
        }
    }

    /* ------------------------------------------------------------ */
    public EndPoint getEndPoint()
    {
        return _endp;
    }


    /* ------------------------------------------------------------ */
    private void commitRequest() throws IOException
    {
        synchronized(this)
        {
            if (_exchange.getStatus()!=HttpExchange.STATUS_WAITING_FOR_COMMIT)
                throw new IllegalStateException();
            
            _exchange.setStatus(HttpExchange.STATUS_SENDING_REQUEST);

            _generator.setVersion(_exchange._version);
            _generator.setRequest(_exchange._method, _exchange._uri);

            if (_exchange._version>=HttpVersions.HTTP_1_1_ORDINAL)
            {
                if(!_exchange._requestFields.containsKey(HttpHeaders.HOST_BUFFER))
                    _exchange._requestFields.add(HttpHeaders.HOST_BUFFER,_destination.getHostHeader());
            }
            
            if (_exchange._requestContent != null)
            {
                _exchange._requestFields.putLongField(HttpHeaders.CONTENT_LENGTH, _exchange._requestContent.length());
                _generator.completeHeader(_exchange._requestFields, false);
                _generator.addContent(_exchange._requestContent, true);
            }
            else if (_exchange._requestContentSource != null)
            {
                _generator.completeHeader(_exchange._requestFields, false);
                int available = _exchange._requestContentSource.available();
                if (available>0)
                {
                    // TODO deal with any known content length
                    
                    // TODO reuse this buffer!
                    byte[] buf = new byte[available];
                    int length =_exchange._requestContentSource.read(buf);
                    _generator.addContent(new ByteArrayBuffer(buf,0,length), false);
                }
            }
            else
            {
                _exchange._requestFields.remove(HttpHeaders.CONTENT_LENGTH); // TODO: should not be needed
                _generator.completeHeader(_exchange._requestFields, true);
            }

            _exchange.setStatus(HttpExchange.STATUS_WAITING_FOR_RESPONSE);
        }
    }

    /* ------------------------------------------------------------ */
    protected void reset(boolean returnBuffers) throws IOException
    {
        _requestComplete=false;
        _connectionHeader = null;
        _parser.reset(returnBuffers); 
        _generator.reset(returnBuffers); 
        _http11=true;
    }
    
    /* ------------------------------------------------------------ */
    private boolean shouldClose()
    {
        if (HttpHeaderValues.CLOSE_BUFFER.equals(_connectionHeader))
        {
            return true;
        }
        else if (HttpHeaderValues.KEEP_ALIVE_BUFFER.equals(_connectionHeader))
        {
            return false;
        }
        else
        {
            return !_http11;
        }
    }

    /* ------------------------------------------------------------ */
    private class Handler extends HttpParser.EventHandler
    {
        @Override
        public void startRequest(Buffer method, Buffer url, Buffer version) throws IOException
        {
            throw new IllegalStateException();
        }

        @Override
        public void startResponse(Buffer version, int status, Buffer reason) throws IOException
        {
            _http11 = HttpVersions.HTTP_1_1_BUFFER.equals(version);
            _exchange.onResponseStatus(version, status, reason);
            _exchange.setStatus(HttpExchange.STATUS_PARSING_HEADERS);
        }
        
        @Override
        public void parsedHeader(Buffer name, Buffer value) throws IOException
        {
            if (HttpHeaders.CACHE.getOrdinal(name)==HttpHeaders.CONNECTION_ORDINAL)
            {
                _connectionHeader = HttpHeaderValues.CACHE.lookup(value);
            }
            _exchange.onResponseHeader(name, value);
        }

        @Override
        public void headerComplete() throws IOException
        {
            _exchange.setStatus(HttpExchange.STATUS_PARSING_CONTENT);
        }

        @Override
        public void content(Buffer ref) throws IOException
        {
            _exchange.onResponseContent(ref);
        }

        @Override
        public void messageComplete(long contextLength) throws IOException
        {
            _exchange.setStatus(HttpExchange.STATUS_COMPLETED);
        }
    }

    /* ------------------------------------------------------------ */
    public String toString()
    {
        return "HttpConnection@"+hashCode()+"//"+_destination.getAddress().getHostName()+":"+_destination.getAddress().getPort();
    }

    /* ------------------------------------------------------------ */
    public String toDetailString()
    {
        return toString()+" ex="+_exchange+" "+_timeout.getAge();
    }

    /* ------------------------------------------------------------ */
    /**
     * @return the last
     */
    public long getLast()
    {
        return _last;
    }

    /* ------------------------------------------------------------ */
    /**
     * @param last the last to set
     */
    public void setLast(long last)
    {
        _last=last;
    }
    
}