<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */


/**
 * Reduces network flooding when sending large amounts of mail.
 * @package Swift
 * @subpackage Plugins
 * @author Chris Corbyn
 */
class Swift_Plugins_BandwidthMonitorPlugin
  implements Swift_Events_SendListener, Swift_Events_CommandListener,
  Swift_Events_ResponseListener, Swift_InputByteStream
{
  
  /**
   * The outgoing traffic counter.
   * @var int
   * @access private
   */
  private $_out = 0;
  
  /**
   * The incoming traffic counter.
   * @var int
   * @access private
   */
  private $_in = 0;
  
  /** Bound byte streams */
  private $_mirrors = array();
  
  /**
   * Not used.
   */
  public function beforeSendPerformed(Swift_Events_SendEvent $evt)
  {
  }
  
  /**
   * Invoked immediately after the Message is sent.
   * @param Swift_Events_SendEvent $evt
   */
  public function sendPerformed(Swift_Events_SendEvent $evt)
  {
    $message = $evt->getMessage();
    $message->toByteStream($this);
  }
  
  /**
   * Invoked immediately following a command being sent.
   * @param Swift_Events_ResponseEvent $evt
   */
  public function commandSent(Swift_Events_CommandEvent $evt)
  {
    $command = $evt->getCommand();
    $this->_out += strlen($command);
  }
  
  /**
   * Invoked immediately following a response coming back.
   * @param Swift_Events_ResponseEvent $evt
   */
  public function responseReceived(Swift_Events_ResponseEvent $evt)
  {
    $response = $evt->getResponse();
    $this->_in += strlen($response);
  }
  
  /**
   * Called when a message is sent so that the outgoing counter can be increased.
   * @param string $bytes
   */
  public function write($bytes)
  {
    $this->_out += strlen($bytes);
    foreach ($this->_mirrors as $stream)
    {
      $stream->write($bytes);
    }
  }
  
  /**
   * Not used.
   */
  public function commit()
  {
  }
  
  /**
   * Attach $is to this stream.
   * The stream acts as an observer, receiving all data that is written.
   * All {@link write()} and {@link flushBuffers()} operations will be mirrored.
   * 
   * @param Swift_InputByteStream $is
   */
  public function bind(Swift_InputByteStream $is)
  {
    $this->_mirrors[] = $is;
  }
  
  /**
   * Remove an already bound stream.
   * If $is is not bound, no errors will be raised.
   * If the stream currently has any buffered data it will be written to $is
   * before unbinding occurs.
   * 
   * @param Swift_InputByteStream $is
   */
  public function unbind(Swift_InputByteStream $is)
  {
    foreach ($this->_mirrors as $k => $stream)
    {
      if ($is === $stream)
      {
        unset($this->_mirrors[$k]);
      }
    }
  }
  
  /**
   * Not used.
   */
  public function flushBuffers()
  {
    foreach ($this->_mirrors as $stream)
    {
      $stream->flushBuffers();
    }
  }
  
  /**
   * Get the total number of bytes sent to the server.
   * @return int
   */
  public function getBytesOut()
  {
    return $this->_out;
  }
  
  /**
   * Get the total number of bytes received from the server.
   * @return int
   */
  public function getBytesIn()
  {
    return $this->_in;
  }
  
  /**
   * Reset the internal counters to zero.
   */
  public function reset()
  {
    $this->_out = 0;
    $this->_in = 0;
  }
  
}
