app/code/core/Mage/Adminhtml/controllers/Newsletter/QueueController.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Adminhtml newsletter queue controller
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Newsletter_QueueController extends Mage_Adminhtml_Controller_Action
{
    /**
     * Queue list action
     */
    public function indexAction()
    {
        if ($this->getRequest()->getQuery('ajax')) {
            $this->_forward('grid');
            return;
        }

        $this->loadLayout();

        $this->_setActiveMenu('newsletter/queue');

        $this->_addContent(
            $this->getLayout()->createBlock('adminhtml/newsletter_queue', 'queue')
        );

        $this->_addBreadcrumb(Mage::helper('newsletter')->__('Newsletter Queue'), Mage::helper('newsletter')->__('Newsletter Queue'));

        $this->renderLayout();
    }

    /**
     * Queue list Ajax action
     */
    public function gridAction()
    {
        $this->getResponse()->setBody($this->getLayout()->createBlock('adminhtml/newsletter_queue_grid')->toHtml());
    }

    public function startAction()
    {
        $queue = Mage::getModel('newsletter/queue')
            ->load($this->getRequest()->getParam('id'));
        if ($queue->getId()) {
            if (!in_array($queue->getQueueStatus(),
                         array(Mage_Newsletter_Model_Queue::STATUS_NEVER,
                               Mage_Newsletter_Model_Queue::STATUS_PAUSE))) {
                $this->_redirect('*/*');
                return;
            }

            $queue->setQueueStartAt(Mage::getSingleton('core/date')->gmtDate())
                ->setQueueStatus(Mage_Newsletter_Model_Queue::STATUS_SENDING)
                ->save();
        }

        $this->_redirect('*/*');
    }

    public function pauseAction()
    {
        $queue = Mage::getSingleton('newsletter/queue')
            ->load($this->getRequest()->getParam('id'));

        if (!in_array($queue->getQueueStatus(),
                     array(Mage_Newsletter_Model_Queue::STATUS_SENDING))) {
            $this->_redirect('*/*');
            return;
        }

        $queue->setQueueStatus(Mage_Newsletter_Model_Queue::STATUS_PAUSE);
        $queue->save();

        $this->_redirect('*/*');
    }

    public function resumeAction()
    {
        $queue = Mage::getSingleton('newsletter/queue')
            ->load($this->getRequest()->getParam('id'));

        if (!in_array($queue->getQueueStatus(),
                     array(Mage_Newsletter_Model_Queue::STATUS_PAUSE))) {
            $this->_redirect('*/*');
            return;
        }

        $queue->setQueueStatus(Mage_Newsletter_Model_Queue::STATUS_SENDING);
        $queue->save();

        $this->_redirect('*/*');
    }

    public function cancelAction()
    {
        $queue = Mage::getSingleton('newsletter/queue')
            ->load($this->getRequest()->getParam('id'));

        if (!in_array($queue->getQueueStatus(),
                     array(Mage_Newsletter_Model_Queue::STATUS_SENDING))) {
            $this->_redirect('*/*');
            return;
        }

        $queue->setQueueStatus(Mage_Newsletter_Model_Queue::STATUS_CANCEL);
        $queue->save();

        $this->_redirect('*/*');
    }

    public function sendingAction()
    {
        // Todo: put it somewhere in config!
        $countOfQueue  = 3;
        $countOfSubscritions = 20;

        $collection = Mage::getResourceModel('newsletter/queue_collection')
            ->setPageSize($countOfQueue)
            ->setCurPage(1)
            ->addOnlyForSendingFilter()
            ->load();

        $collection->walk('sendPerSubscriber', array($countOfSubscritions));
    }


    public function editAction()
    {
        $queue = Mage::getSingleton('newsletter/queue')
            ->load($this->getRequest()->getParam('id'));

        Mage::register('current_queue', $queue);

        $this->loadLayout();

        $this->_setActiveMenu('newsletter/queue');

        $this->_addBreadcrumb(Mage::helper('newsletter')->__('Newsletter Queue'), Mage::helper('newsletter')->__('Newsletter Queue'), $this->getUrl('*/newsletter_queue'));
        $this->_addBreadcrumb(Mage::helper('newsletter')->__('Edit Queue'), Mage::helper('newsletter')->__('Edit Queue'));

        $this->_addContent(
            $this->getLayout()->createBlock('adminhtml/newsletter_queue_edit', 'queue.edit')
        );

        $this->renderLayout();
    }

    public function saveAction()
    {
        $queue = Mage::getSingleton('newsletter/queue')
            ->load($this->getRequest()->getParam('id'));

        if (!in_array($queue->getQueueStatus(),
                     array(Mage_Newsletter_Model_Queue::STATUS_NEVER,
                           Mage_Newsletter_Model_Queue::STATUS_PAUSE))) {
            $this->_redirect('*/*');
            return;
        }

        $format = Mage::app()->getLocale()->getDateTimeFormat(
            Mage_Core_Model_Locale::FORMAT_TYPE_MEDIUM
        );

        if ($queue->getQueueStatus()==Mage_Newsletter_Model_Queue::STATUS_NEVER) {
            if ($this->getRequest()->getParam('start_at')) {
                $date = Mage::app()->getLocale()->date($this->getRequest()->getParam('start_at'), $format);
                $time = $date->getTimestamp();
                $queue->setQueueStartAt(
                    Mage::getModel('core/date')->gmtDate(null, $time)
                );
            } else {
                $queue->setQueueStartAt(null);
            }
        }

        $queue->setStores($this->getRequest()->getParam('stores', array()));

        $queue->addTemplateData($queue);
        $queue->getTemplate()
            ->setTemplateSubject($this->getRequest()->getParam('subject'))
            ->setTemplateSenderName($this->getRequest()->getParam('sender_name'))
            ->setTemplateSenderEmail($this->getRequest()->getParam('sender_email'))
            ->setTemplateTextPreprocessed($this->getRequest()->getParam('text'));

        if ($queue->getQueueStatus() == Mage_Newsletter_Model_Queue::STATUS_PAUSE
            && $this->getRequest()->getParam('_resume', false)) {
            $queue->setQueueStatus(Mage_Newsletter_Model_Queue::STATUS_SENDING);
        }

        $queue->setSaveTemplateFlag(true);

        try {
            $queue->save();
        }
        catch (Exception $e) {
            echo $e->getMessage();
            exit;
        }
        $this->_redirect('*/*');
    }

    protected function _isAllowed()
    {
        return Mage::getSingleton('admin/session')->isAllowed('newsletter/queue');
    }
}

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