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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * 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@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Service_WindowsAzure
  * @subpackage Storage
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Log_Writer_Abstract
  */
 // require_once 'Zend/Log/Writer/Abstract.php';
 
 /**
  * @category   Zend
  * @package    Zend_Service_WindowsAzure
  * @subpackage Log
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Service_WindowsAzure_Log_Writer_WindowsAzure
     extends Zend_Log_Writer_Abstract
 {
     /**
      * @var Zend_Service_Log_Formatter_Interface
      */
     protected $_formatter;
 
     /**
      * Connection to a windows Azure
      *
      * @var Zend_Service_Service_WindowsAzure_Storage_Table
      */
     protected $_tableStorageConnection = null;
 
     /**
      * Name of the table to use for logging purposes
      *
      * @var string
      */
     protected $_tableName = null;
 
     /**
      * Whether to keep all messages to be logged in an external buffer until the script ends and
      * only then to send the messages in batch to the logging component.
      *
      * @var bool
      */
     protected $_bufferMessages = false;
 
     /**
      * If message buffering is activated, it will store all the messages in this buffer and only
      * write them to table storage (in a batch transaction) when the script ends.
      *
      * @var array
      */
     protected $_messageBuffer = array();
 
     /**
      * @param Zend_Service_Service_WindowsAzure_Storage_Table|Zend_Service_WindowsAzure_Storage_Table $tableStorageConnection
      * @param string                                                                                  $tableName
      * @param bool                                                                                    $createTable create the Windows Azure table for logging if it does not exist
      * @param bool                                                                                    $bufferMessages
      * @throws Zend_Service_Log_Exception
      */
     public function __construct(
         Zend_Service_WindowsAzure_Storage_Table $tableStorageConnection,
         $tableName, $createTable = true, $bufferMessages = true
     )
     {
         if ($tableStorageConnection == null) {
             // require_once 'Zend/Service/Log/Exception.php';
             throw new Zend_Service_Log_Exception(
                 'No connection to the Windows Azure tables provided.'
             );
         }
 
         if (!is_string($tableName)) {
             // require_once 'Zend/Service/Log/Exception.php';
             throw new Zend_Service_Log_Exception(
                 'Provided Windows Azure table name must be a string.'
             );
         }
 
         $this->_tableStorageConnection = $tableStorageConnection;
         $this->_tableName              = $tableName;
 
         // create the logging table if it does not exist. It will add some overhead, so it's optional
         if ($createTable) {
             $this->_tableStorageConnection->createTableIfNotExists(
                 $this->_tableName
             );
         }
 
         // keep messages to be logged in an internal buffer and only send them over the wire when
         // the script execution ends
         if ($bufferMessages) {
             $this->_bufferMessages = $bufferMessages;
         }
 
         $this->_formatter =
             new Zend_Service_WindowsAzure_Log_Formatter_WindowsAzure();
     }
 
     /**
      * If the log messages have been stored in the internal buffer, just send them
      * to table storage.
      */
     public function shutdown()
     {
         parent::shutdown();
         if ($this->_bufferMessages) {
             $this->_tableStorageConnection->startBatch();
             foreach ($this->_messageBuffer as $logEntity) {
                 $this->_tableStorageConnection->insertEntity(
                     $this->_tableName, $logEntity
                 );
             }
             $this->_tableStorageConnection->commit();
         }
     }
 
     /**
      * Create a new instance of Zend_Service_Log_Writer_WindowsAzure
      *
      * @param  array $config
      * @return Zend_Service_Log_Writer_WindowsAzure
      * @throws Zend_Service_Log_Exception
      */
     static public function factory($config)
     {
         $config = self::_parseConfig($config);
         $config = array_merge(
             array(
                  'connection' => null,
                  'tableName' => null,
                  'createTable' => true,
             ), $config
         );
 
         return new self(
             $config['connection'],
             $config['tableName'],
             $config['createTable']
         );
     }
 
     /**
      * The only formatter accepted is already  loaded in the constructor
      *
      * @todo enable custom formatters using the WindowsAzure_Storage_DynamicTableEntity class
      */
     public function setFormatter(
         Zend_Service_Log_Formatter_Interface $formatter
     )
     {
         // require_once 'Zend/Service/Log/Exception.php';
         throw new Zend_Service_Log_Exception(
             get_class($this) . ' does not support formatting');
     }
 
     /**
      * Write a message to the table storage. If buffering is activated, then messages will just be
      * added to an internal buffer.
      *
      * @param  array $event
      * @return void
      * @todo   format the event using a formatted, not in this method
      */
     protected function _write($event)
     {
         $logEntity = $this->_formatter->format($event);
 
         if ($this->_bufferMessages) {
             $this->_messageBuffer[] = $logEntity;
         } else {
             $this->_tableStorageConnection->insertEntity(
                 $this->_tableName, $logEntity
             );
         }
     }
 }