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537 lines
16 KiB
PHP
537 lines
16 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Queue
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Db.php 18705 2009-10-26 13:05:13Z matthew $
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*/
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/**
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* @see Zend_Queue_Adapter_AdapterAbstract
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*/
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require_once 'Zend/Queue/Adapter/AdapterAbstract.php';
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/**
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* @see Zend_Db_Select
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*/
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require_once 'Zend/Db/Select.php';
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/**
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* @see Zend_Db
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*/
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require_once 'Zend/Db.php';
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/**
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* @see Zend_Queue_Adapter_Db_Queue
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*/
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require_once 'Zend/Queue/Adapter/Db/Queue.php';
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/**
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* @see Zend_Queue_Adapter_Db_Message
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*/
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require_once 'Zend/Queue/Adapter/Db/Message.php';
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/**
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* Class for using connecting to a Zend_Db-based queuing system
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*
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* @category Zend
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* @package Zend_Queue
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Queue_Adapter_Db extends Zend_Queue_Adapter_AdapterAbstract
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{
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/**
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* @var Zend_Queue_Adapter_Db_Queue
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*/
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protected $_queueTable = null;
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/**
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* @var Zend_Queue_Adapter_Db_Message
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*/
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protected $_messageTable = null;
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/**
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* @var Zend_Db_Table_Row_Abstract
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*/
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protected $_messageRow = null;
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/**
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* Constructor
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*
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* @param array|Zend_Config $options
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* @param Zend_Queue|null $queue
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* @return void
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*/
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public function __construct($options, Zend_Queue $queue = null)
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{
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parent::__construct($options, $queue);
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if (!isset($this->_options['options'][Zend_Db_Select::FOR_UPDATE])) {
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// turn off auto update by default
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$this->_options['options'][Zend_Db_Select::FOR_UPDATE] = false;
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}
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if (!is_bool($this->_options['options'][Zend_Db_Select::FOR_UPDATE])) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception('Options array item: Zend_Db_Select::FOR_UPDATE must be boolean');
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}
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if (isset($this->_options['dbAdapter'])
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&& $this->_options['dbAdapter'] instanceof Zend_Db_Adapter_Abstract) {
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$db = $this->_options['dbAdapter'];
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} else {
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$db = $this->_initDbAdapter();
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}
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$this->_queueTable = new Zend_Queue_Adapter_Db_Queue(array(
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'db' => $db,
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));
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$this->_messageTable = new Zend_Queue_Adapter_Db_Message(array(
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'db' => $db,
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));
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}
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/**
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* Initialize Db adapter using 'driverOptions' section of the _options array
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*
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* Throws an exception if the adapter cannot connect to DB.
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*
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* @return Zend_Db_Adapter_Abstract
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* @throws Zend_Queue_Exception
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*/
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protected function _initDbAdapter()
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{
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$options = &$this->_options['driverOptions'];
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if (!array_key_exists('type', $options)) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception("Configuration array must have a key for 'type' for the database type to use");
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}
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if (!array_key_exists('host', $options)) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception("Configuration array must have a key for 'host' for the host to use");
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}
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if (!array_key_exists('username', $options)) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception("Configuration array must have a key for 'username' for the username to use");
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}
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if (!array_key_exists('password', $options)) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception("Configuration array must have a key for 'password' for the password to use");
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}
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if (!array_key_exists('dbname', $options)) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception("Configuration array must have a key for 'dbname' for the database to use");
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}
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$type = $options['type'];
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unset($options['type']);
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try {
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$db = Zend_Db::factory($type, $options);
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} catch (Zend_Db_Exception $e) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception('Error connecting to database: ' . $e->getMessage(), $e->getCode());
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}
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return $db;
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}
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/********************************************************************
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* Queue management functions
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*********************************************************************/
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/**
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* Does a queue already exist?
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*
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* Throws an exception if the adapter cannot determine if a queue exists.
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* use isSupported('isExists') to determine if an adapter can test for
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* queue existance.
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*
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* @param string $name
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* @return boolean
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* @throws Zend_Queue_Exception
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*/
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public function isExists($name)
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{
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$id = 0;
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try {
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$id = $this->getQueueId($name);
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} catch (Zend_Queue_Exception $e) {
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return false;
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}
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return ($id > 0);
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}
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/**
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* Create a new queue
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*
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* Visibility timeout is how long a message is left in the queue "invisible"
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* to other readers. If the message is acknowleged (deleted) before the
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* timeout, then the message is deleted. However, if the timeout expires
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* then the message will be made available to other queue readers.
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*
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* @param string $name queue name
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* @param integer $timeout default visibility timeout
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* @return boolean
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* @throws Zend_Queue_Exception - database error
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*/
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public function create($name, $timeout = null)
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{
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if ($this->isExists($name)) {
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return false;
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}
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$queue = $this->_queueTable->createRow();
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$queue->queue_name = $name;
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$queue->timeout = ($timeout === null) ? self::CREATE_TIMEOUT_DEFAULT : (int)$timeout;
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try {
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if ($queue->save()) {
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return true;
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}
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} catch (Exception $e) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception($e->getMessage(), $e->getCode());
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}
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return false;
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}
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/**
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* Delete a queue and all of it's messages
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*
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* Returns false if the queue is not found, true if the queue exists
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*
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* @param string $name queue name
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* @return boolean
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* @throws Zend_Queue_Exception - database error
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*/
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public function delete($name)
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{
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$id = $this->getQueueId($name); // get primary key
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// if the queue does not exist then it must already be deleted.
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$list = $this->_queueTable->find($id);
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if (count($list) === 0) {
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return false;
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}
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$queue = $list->current();
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if ($queue instanceof Zend_Db_Table_Row_Abstract) {
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try {
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$queue->delete();
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} catch (Exception $e) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception($e->getMessage(), $e->getCode());
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}
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}
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if (array_key_exists($name, $this->_queues)) {
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unset($this->_queues[$name]);
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}
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return true;
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}
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/*
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* Get an array of all available queues
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*
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* Not all adapters support getQueues(), use isSupported('getQueues')
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* to determine if the adapter supports this feature.
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*
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* @return array
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* @throws Zend_Queue_Exception - database error
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*/
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public function getQueues()
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{
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$query = $this->_queueTable->select();
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$query->from($this->_queueTable, array('queue_id', 'queue_name'));
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$this->_queues = array();
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foreach ($this->_queueTable->fetchAll($query) as $queue) {
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$this->_queues[$queue->queue_name] = (int)$queue->queue_id;
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}
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$list = array_keys($this->_queues);
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return $list;
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}
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/**
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* Return the approximate number of messages in the queue
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*
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* @param Zend_Queue $queue
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* @return integer
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* @throws Zend_Queue_Exception
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*/
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public function count(Zend_Queue $queue = null)
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{
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if ($queue === null) {
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$queue = $this->_queue;
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}
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$info = $this->_messageTable->info();
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$db = $this->_messageTable->getAdapter();
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$query = $db->select();
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$query->from($info['name'], array(new Zend_Db_Expr('COUNT(1)')))
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->where('queue_id=?', $this->getQueueId($queue->getName()));
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// return count results
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return (int) $db->fetchOne($query);
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}
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/********************************************************************
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* Messsage management functions
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*********************************************************************/
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/**
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* Send a message to the queue
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*
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* @param string $message Message to send to the active queue
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* @param Zend_Queue $queue
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* @return Zend_Queue_Message
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* @throws Zend_Queue_Exception - database error
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*/
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public function send($message, Zend_Queue $queue = null)
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{
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if ($this->_messageRow === null) {
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$this->_messageRow = $this->_messageTable->createRow();
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}
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if ($queue === null) {
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$queue = $this->_queue;
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}
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if (is_scalar($message)) {
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$message = (string) $message;
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}
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if (is_string($message)) {
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$message = trim($message);
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}
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if (!$this->isExists($queue->getName())) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception('Queue does not exist:' . $queue->getName());
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}
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$msg = clone $this->_messageRow;
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$msg->queue_id = $this->getQueueId($queue->getName());
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$msg->created = time();
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$msg->body = $message;
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$msg->md5 = md5($message);
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// $msg->timeout = ??? @TODO
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try {
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$msg->save();
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} catch (Exception $e) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception($e->getMessage(), $e->getCode());
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}
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$options = array(
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'queue' => $queue,
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'data' => $msg->toArray(),
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);
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$classname = $queue->getMessageClass();
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if (!class_exists($classname)) {
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require_once 'Zend/Loader.php';
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Zend_Loader::loadClass($classname);
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}
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return new $classname($options);
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}
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/**
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* Get messages in the queue
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*
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* @param integer $maxMessages Maximum number of messages to return
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* @param integer $timeout Visibility timeout for these messages
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* @param Zend_Queue $queue
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* @return Zend_Queue_Message_Iterator
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* @throws Zend_Queue_Exception - database error
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*/
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public function receive($maxMessages = null, $timeout = null, Zend_Queue $queue = null)
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{
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if ($maxMessages === null) {
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$maxMessages = 1;
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}
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if ($timeout === null) {
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$timeout = self::RECEIVE_TIMEOUT_DEFAULT;
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}
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if ($queue === null) {
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$queue = $this->_queue;
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}
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$msgs = array();
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$info = $this->_messageTable->info();
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$microtime = microtime(true); // cache microtime
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$db = $this->_messageTable->getAdapter();
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// start transaction handling
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try {
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if ( $maxMessages > 0 ) { // ZF-7666 LIMIT 0 clause not included.
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$db->beginTransaction();
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$query = $db->select();
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if ($this->_options['options'][Zend_Db_Select::FOR_UPDATE]) {
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// turn on forUpdate
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$query->forUpdate();
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}
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$query->from($info['name'], array('*'))
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->where('queue_id=?', $this->getQueueId($queue->getName()))
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->where('handle IS NULL OR timeout+' . (int)$timeout . ' < ' . (int)$microtime)
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->limit($maxMessages);
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foreach ($db->fetchAll($query) as $data) {
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// setup our changes to the message
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$data['handle'] = md5(uniqid(rand(), true));
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$update = array(
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'handle' => $data['handle'],
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'timeout' => $microtime,
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);
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// update the database
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$where = array();
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$where[] = $db->quoteInto('message_id=?', $data['message_id']);
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$where[] = 'handle IS NULL OR timeout+' . (int)$timeout . ' < ' . (int)$microtime;
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$count = $db->update($info['name'], $update, $where);
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// we check count to make sure no other thread has gotten
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// the rows after our select, but before our update.
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if ($count > 0) {
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$msgs[] = $data;
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}
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}
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$db->commit();
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}
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} catch (Exception $e) {
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$db->rollBack();
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception($e->getMessage(), $e->getCode());
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}
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$options = array(
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'queue' => $queue,
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'data' => $msgs,
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'messageClass' => $queue->getMessageClass(),
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);
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$classname = $queue->getMessageSetClass();
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if (!class_exists($classname)) {
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require_once 'Zend/Loader.php';
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Zend_Loader::loadClass($classname);
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}
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return new $classname($options);
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}
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/**
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* Delete a message from the queue
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*
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* Returns true if the message is deleted, false if the deletion is
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* unsuccessful.
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*
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* @param Zend_Queue_Message $message
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* @return boolean
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* @throws Zend_Queue_Exception - database error
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*/
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public function deleteMessage(Zend_Queue_Message $message)
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{
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$db = $this->_messageTable->getAdapter();
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$where = $db->quoteInto('handle=?', $message->handle);
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if ($this->_messageTable->delete($where)) {
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return true;
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}
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return false;
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}
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/********************************************************************
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* Supporting functions
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*********************************************************************/
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/**
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* Return a list of queue capabilities functions
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*
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* $array['function name'] = true or false
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* true is supported, false is not supported.
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*
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* @param string $name
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* @return array
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*/
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public function getCapabilities()
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{
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return array(
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'create' => true,
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'delete' => true,
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'send' => true,
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'receive' => true,
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'deleteMessage' => true,
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'getQueues' => true,
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'count' => true,
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'isExists' => true,
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);
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}
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|
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/********************************************************************
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* Functions that are not part of the Zend_Queue_Adapter_Abstract
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*********************************************************************/
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/**
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* Get the queue ID
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*
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* Returns the queue's row identifier.
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*
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* @param string $name
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* @return integer|null
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* @throws Zend_Queue_Exception
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*/
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protected function getQueueId($name)
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{
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if (array_key_exists($name, $this->_queues)) {
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return $this->_queues[$name];
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}
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$query = $this->_queueTable->select();
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$query->from($this->_queueTable, array('queue_id'))
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->where('queue_name=?', $name);
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$queue = $this->_queueTable->fetchRow($query);
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if ($queue === null) {
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require_once 'Zend/Queue/Exception.php';
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throw new Zend_Queue_Exception('Queue does not exist: ' . $name);
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}
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$this->_queues[$name] = (int)$queue->queue_id;
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return $this->_queues[$name];
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}
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}
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