diff -r 000000000000 -r 7f95f8617b0b vendor/swiftmailer/lib/classes/Swift/Plugins/ThrottlerPlugin.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/swiftmailer/lib/classes/Swift/Plugins/ThrottlerPlugin.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,184 @@
+<?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.
+ */
+
+
+/**
+ * Throttles the rate at which emails are sent.
+ * @package Swift
+ * @subpackage Plugins
+ * @author Chris Corbyn
+ */
+class Swift_Plugins_ThrottlerPlugin
+  extends Swift_Plugins_BandwidthMonitorPlugin
+  implements Swift_Plugins_Sleeper, Swift_Plugins_Timer
+{
+  
+  /** Flag for throttling in bytes per minute */
+  const BYTES_PER_MINUTE = 0x01;
+  
+  /** Flag for throttling in emails per minute */
+  const MESSAGES_PER_MINUTE = 0x10;
+  
+  /**
+   * The Sleeper instance for sleeping.
+   * @var Swift_Plugins_Sleeper
+   * @access private
+   */
+  private $_sleeper;
+  
+  /**
+   * The Timer instance which provides the timestamp.
+   * @var Swift_Plugins_Timer
+   * @access private
+   */
+  private $_timer;
+  
+  /**
+   * The time at which the first email was sent.
+   * @var int
+   * @access private
+   */
+  private $_start;
+  
+  /**
+   * The rate at which messages should be sent.
+   * @var int
+   * @access private
+   */
+  private $_rate;
+  
+  /**
+   * The mode for throttling.
+   * This is {@link BYTES_PER_MINUTE} or {@link MESSAGES_PER_MINUTE}
+   * @var int
+   * @access private
+   */
+  private $_mode;
+  
+  /**
+   * An internal counter of the number of messages sent.
+   * @var int
+   * @access private
+   */
+  private $_messages = 0;
+  
+  /**
+   * Create a new ThrottlerPlugin.
+   * @param int $rate
+   * @param int $mode, defaults to {@link BYTES_PER_MINUTE}
+   * @param Swift_Plugins_Sleeper $sleeper (only needed in testing)
+   * @param Swift_Plugins_Timer $timer (only needed in testing)
+   */
+  public function __construct($rate, $mode = self::BYTES_PER_MINUTE,
+    Swift_Plugins_Sleeper $sleeper = null, Swift_Plugins_Timer $timer = null)
+  {
+    $this->_rate = $rate;
+    $this->_mode = $mode;
+    $this->_sleeper = $sleeper;
+    $this->_timer = $timer;
+  }
+  
+  /**
+   * Invoked immediately before the Message is sent.
+   * @param Swift_Events_SendEvent $evt
+   */
+  public function beforeSendPerformed(Swift_Events_SendEvent $evt)
+  {
+    $time = $this->getTimestamp();
+    if (!isset($this->_start))
+    {
+      $this->_start = $time;
+    }
+    $duration = $time - $this->_start;
+    
+    if (self::BYTES_PER_MINUTE == $this->_mode)
+    {
+      $sleep = $this->_throttleBytesPerMinute($duration);
+    }
+    else
+    {
+      $sleep = $this->_throttleMessagesPerMinute($duration);
+    }
+    
+    if ($sleep > 0)
+    {
+      $this->sleep($sleep);
+    }
+  }
+  
+  /**
+   * Invoked when a Message is sent.
+   * @param Swift_Events_SendEvent $evt
+   */
+  public function sendPerformed(Swift_Events_SendEvent $evt)
+  {
+    parent::sendPerformed($evt);
+    ++$this->_messages;
+  }
+  
+  /**
+   * Sleep for $seconds.
+   * @param int $seconds
+   */
+  public function sleep($seconds)
+  {
+    if (isset($this->_sleeper))
+    {
+      $this->_sleeper->sleep($seconds);
+    }
+    else
+    {
+      sleep($seconds);
+    }
+  }
+  
+  /**
+   * Get the current UNIX timestamp
+   * @return int
+   */
+  public function getTimestamp()
+  {
+    if (isset($this->_timer))
+    {
+      return $this->_timer->getTimestamp();
+    }
+    else
+    {
+      return time();
+    }
+  }
+  
+  // -- Private methods
+  
+  /**
+   * Get a number of seconds to sleep for.
+   * @param int $timePassed
+   * @return int
+   * @access private
+   */
+  private function _throttleBytesPerMinute($timePassed)
+  {
+    $expectedDuration = $this->getBytesOut() / ($this->_rate / 60);
+    return (int) ceil($expectedDuration - $timePassed);
+  }
+  
+  /**
+   * Get a number of seconds to sleep for.
+   * @param int $timePassed
+   * @return int
+   * @access private
+   */
+  private function _throttleMessagesPerMinute($timePassed)
+  {
+    $expectedDuration = $this->_messages / ($this->_rate / 60);
+    return (int) ceil($expectedDuration - $timePassed);
+  }
+  
+}