httpdestination.java

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//========================================================================
//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.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;

import javax.servlet.http.Cookie;

import org.mortbay.io.Buffer;
import org.mortbay.io.ByteArrayBuffer;
import org.mortbay.jetty.HttpHeaders;
import org.mortbay.jetty.client.security.Authorization;
import org.mortbay.jetty.client.security.SecurityListener;
import org.mortbay.jetty.servlet.PathMap;
import org.mortbay.log.Log;

/**
* @author Greg Wilkins
* @author Guillaume Nodet
*/
public class HttpDestination
{
    private ByteArrayBuffer _hostHeader;
    private final Address _address;
    private final LinkedList<HttpConnection> _connections = new LinkedList<HttpConnection>();
    private final ArrayList<HttpConnection> _idle = new ArrayList<HttpConnection>();
    private final HttpClient _client;
    private final boolean _ssl;
    private int _maxConnections;
    private int _pendingConnections=0;
    private ArrayBlockingQueue<Object> _newQueue = new ArrayBlockingQueue<Object>(10,true);
    private int _newConnection=0;
    private Address _proxy;
    private Authorization _proxyAuthentication;
    private PathMap _authorizations;
    private List<Cookie> _cookies;

    public void dump() throws IOException
    {
        synchronized (this)
        {
            System.err.println(this);
            System.err.println("connections="+_connections.size());
            System.err.println("idle="+_idle.size());
            System.err.println("pending="+_pendingConnections);
            for (HttpConnection c : _connections)
            {
                if (!c.isIdle())
                    c.dump();
            }
        }
    }
    
    /* The queue of exchanged for this destination if connections are limited */
    private LinkedList<HttpExchange> _queue=new LinkedList<HttpExchange>();

    /* ------------------------------------------------------------ */
    HttpDestination(HttpClient pool, Address address, boolean ssl, int maxConnections)
    {
        _client=pool;
        _address=address;
        _ssl=ssl;
        _maxConnections=maxConnections;
        String addressString = address.getHost();
        if (address.getPort() != (_ssl ? 443 : 80)) addressString += ":" + address.getPort();
        _hostHeader = new ByteArrayBuffer(addressString);
    }

    /* ------------------------------------------------------------ */
    public Address getAddress()
    {
        return _address;
    }

    /* ------------------------------------------------------------ */
    public Buffer getHostHeader()
    {
        return _hostHeader;
    }
    
    /* ------------------------------------------------------------ */
    public HttpClient getHttpClient()
    {
        return _client;
    }

    /* ------------------------------------------------------------ */
    public boolean isSecure()
    {
        return _ssl;
    }
    
    /* ------------------------------------------------------------ */
    public void addAuthorization(String pathSpec,Authorization authorization)
    {
        synchronized (this)
        {
            if (_authorizations==null)
                _authorizations=new PathMap();
            _authorizations.put(pathSpec,authorization);
        }
        
        // TODO query and remove methods
    }

    /* ------------------------------------------------------------------------------- */
    public void addCookie(Cookie cookie)
    {
        synchronized (this)
        {
            if (_cookies==null)
                _cookies=new ArrayList<Cookie>();
            _cookies.add(cookie);
        }
        
        // TODO query, remove and age methods
    }
    
    /* ------------------------------------------------------------------------------- */
    /**
     * Get a connection. We either get an idle connection if one is available, or
     * we make a new connection, if we have not yet reached maxConnections. If we
     * have reached maxConnections, we wait until the number reduces.
     * @param timeout max time prepared to block waiting to be able to get a connection
     * @return
     * @throws IOException
     */
    private HttpConnection getConnection(long timeout) throws IOException
    {
        HttpConnection connection = null;

        while ((connection == null) && (connection = getIdleConnection()) == null && timeout>0)
        {
            int totalConnections = 0;
            boolean starting = false;
            synchronized (this)
            {
                totalConnections = _connections.size() + _pendingConnections;
                if (totalConnections < _maxConnections)
                {
                    _newConnection++;
                    startNewConnection();
                    starting = true;
                }
            }
            
            if (!starting)
            {
                try
                {
                    Thread.currentThread().sleep(200);
                    timeout-=200;
                }
                catch (InterruptedException e)
                {
                    Log.ignore(e);
                }
            }
            else
            {
               try
               {
                   Object o = _newQueue.take();
                   if (o instanceof HttpConnection)
                   {
                       connection = (HttpConnection)o;
                   }
                   else
                       throw (IOException)o;
               }
               catch (InterruptedException e)
               {
                   Log.ignore(e);
               }
           }
        }
        return connection;
    }
    
    /* ------------------------------------------------------------------------------- */
    public HttpConnection reserveConnection(long timeout) throws IOException
    {
        HttpConnection connection = getConnection(timeout);
        if (connection != null)
            connection.setReserved(true);
        return connection;
    }

    /* ------------------------------------------------------------------------------- */
    public HttpConnection getIdleConnection() throws IOException
    {
        synchronized (this)
        {
            long now = System.currentTimeMillis();
            long idleTimeout=_client.getIdleTimeout();
 
            // Find an idle connection
            while (_idle.size() > 0)
            {
                HttpConnection connection = _idle.remove(_idle.size()-1);
                long last = connection.getLast();
                if (connection.getEndPoint().isOpen() && (last==0 || ((now-last)<idleTimeout)) )
                    return connection;
                else
                {
                    _connections.remove(connection);
                    connection.getEndPoint().close();
                }
            }

            return null;
        }
    }

    /* ------------------------------------------------------------------------------- */
    protected void startNewConnection() 
    {
        try
        {
            synchronized (this)
            {
                _pendingConnections++;
            }
            _client._connector.startConnection(this);
        }
        catch(Exception e)
        {
            onConnectionFailed(e);
        }
    }

    /* ------------------------------------------------------------------------------- */
    public void onConnectionFailed(Throwable throwable)
    {
        Throwable connect_failure=null;
        
        synchronized (this)
        {
            _pendingConnections--;
            if (_newConnection>0)
            {
                connect_failure=throwable;
                _newConnection--;
            }
            else if (_queue.size()>0)
            {
                HttpExchange ex=_queue.removeFirst();
                ex.getEventListener().onConnectionFailed(throwable);
            }
        }

        if(connect_failure!=null)
        {
            try
            {
                _newQueue.put(connect_failure);
            }