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<?php

/*
 High-availability failover Transport class from Swift Mailer.
 
 This program 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 3 of the License, or
 (at your option) any later version.
 
 This program 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.  See the
 GNU General Public License for more details.

You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 */

//@require 'Swift/Transport/LoadBalancedTransport.php';
//@require 'Swift/Mime/Message.php';

/**
 * Contains a list of redundant Transports so when one fails, the next is used.
 *
 * @author Chris Corbyn
 */
class Swift_Transport_FailoverTransport
  extends Swift_Transport_LoadBalancedTransport
{
    /**
   * Registered transport curently used.
   *
   * @var Swift_Transport
   */
  private $_currentTransport;

/**
   * Creates a new FailoverTransport.
   */
  public function __construct()
  {
      parent::__construct();
  }

/**
   * Send the given Message.
   * Recipient/sender data will be retreived from the Message API.
   * The return value is the number of recipients who were accepted for delivery.
   *
   * @param Swift_Mime_Message $message
   * @param string[] &$failedRecipients to collect failures by-reference
   *
   * @return int
   */
  public function send(Swift_Mime_Message $message, &$failedRecipients = null)
  {
      $maxTransports = count($this->_transports);
      $sent = 0;

for ($i = 0; $i < $maxTransports
      && $transport = $this->_getNextTransport(); ++$i) {
          try {
              if (!$transport->isStarted()) {
                  $transport->start();
              }

return $transport->send($message, $failedRecipients);
          } catch (Swift_TransportException $e) {
              $this->_killCurrentTransport();
          }
      }

if (count($this->_transports) == 0) {
          throw new Swift_TransportException(
        'All Transports in FailoverTransport failed, or no Transports available'
        );
      }

return $sent;
  }

// -- Protected methods

protected function _getNextTransport()
  {
      if (!isset($this->_currentTransport)) {
          $this->_currentTransport = parent::_getNextTransport();
      }

return $this->_currentTransport;
  }

protected function _killCurrentTransport()
    {
        $this->_currentTransport = null;
        parent::_killCurrentTransport();
    }
}

[+] ..
[-] MailTransport.php [edit]
[-] EsmtpTransport.php [edit]
[-] AbstractSmtpTransport.php [edit]
[-] FailoverTransport.php [edit]
[-] StreamBuffer.php [edit]
[-] SendmailTransport.php [edit]
[-] IoBuffer.php [edit]
[+] Esmtp
[-] SimpleMailInvoker.php [edit]
[-] LoadBalancedTransport.php [edit]
[-] MailInvoker.php [edit]
[-] SmtpAgent.php [edit]
[-] EsmtpHandler.php [edit]