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