tcpduplexcontroller.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 212 行

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.server.connection;

import java.util.*;
import java.util.logging.*;
import javax.servlet.*;

import com.caucho.server.port.*;
import com.caucho.util.*;
import com.caucho.vfs.*;

/**
 * Public API to control a http upgrade connection.
 */
public class TcpDuplexController extends ConnectionController
{
  private static final L10N L = new L10N(TcpDuplexController.class);
  private static final Logger log
    = Logger.getLogger(TcpDuplexController.class.getName());

  private ClassLoader _loader;
  
  private TcpServerRequest _request;
  private TcpConnection _conn;
  private long _maxIdleTime;

  private ReadStream _is;
  private WriteStream _os;

  private TcpDuplexHandler _handler;
  private String _readThreadName;

  public TcpDuplexController(TcpServerRequest request,
			     TcpDuplexHandler handler)
  {
    super(request.getConnection());

    if (handler == null)
      throw new NullPointerException(L.l("handler is a required argument"));

    _conn = (TcpConnection) request.getConnection();
    _handler = handler;
    
    _request = request;
    _loader = Thread.currentThread().getContextClassLoader();

    _is = _conn.getReadStream();
    _os = _conn.getWriteStream();
    
    _readThreadName = ("resin-" + _handler.getClass().getSimpleName()
		       + "-read-" + request.getConnection().getId());
  }

  private static AbstractHttpRequest
    getAbstractHttpRequest(ServletRequest request)
  {
    return (AbstractHttpRequest) request;
  }

  /**
   * Returns true for a duplex controller
   */
  @Override
  public boolean isDuplex()
  {
    return true;
  }
  
  /**
   * Sets the max idle time.
   */
  public void setIdleTimeMax(long idleTime)
  {
    if (idleTime < 0 || Long.MAX_VALUE / 2 < idleTime)
      idleTime = Long.MAX_VALUE / 2;
    
    TcpConnection conn = _conn;
    if (conn != null)
      conn.setIdleTimeMax(idleTime);
  }
  
  /**
   * Gets the max idle time.
   */
  public long getIdleTimeMax()
  {
    TcpConnection conn = _conn;
    
    if (conn != null)
      return conn.getIdleTimeMax();
    else
      return -1;
  }
  
  /**
   * Returns the read stream.  The read stream should only be
   * used by the read handler.
   */
  public ReadStream getReadStream()
  {
    return _is;
  }
  
  /**
   * Returns the write stream.  The write stream must be synchronized
   * if multiple threads can write to it.
   */
  public WriteStream getWriteStream()
  {
    return _os;
  }

  /**
   * Returns the handler
   */
  public TcpDuplexHandler getHandler()
  {
    return _handler;
  }

  /**
   * Closes the connection.
   */
  @Override
  public void close()
  {
    _conn = null;
    _request = null;
    _is = null;
    _os = null;
    _handler = null;
    _loader = null;
    
    super.close();
  }

  public boolean serviceRead()
  {
    Thread thread = Thread.currentThread();
      
    boolean isValid = false;

    String oldName = thread.getName();
      
    try {
      thread.setName(_readThreadName);
      thread.setContextClassLoader(_loader);

      TcpConnection conn = (TcpConnection) getConnection();
      ReadStream is = _is;
      TcpDuplexHandler handler = _handler;
      
      if (conn == null || is == null || handler == null)
         return false;
        
      isValid = handler.serviceRead(is, this);
    } catch (Exception e) {
      log.log(Level.FINE, e.toString(), e);
    } finally {
      thread.setName(oldName);
      
      if (! isValid)
        close();
    }
    
    return isValid;
  }

  @Override
  public String toString()
  {
    TcpServerRequest request = _request;

    if (request == null || request.getConnection() == null)
      return getClass().getSimpleName() + "[closed]";
    else if (Alarm.isTest())
      return getClass().getSimpleName() + "[" + _handler + "]";
    else
      return (getClass().getSimpleName() + "["
	      + request.getConnection().getId()
	      + "," + _handler + "]");
  }
}