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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: Memcacheq.php 18951 2009-11-12 16:26:19Z alexander $
*/
/**
* @see Zend_Queue_Adapter_AdapterAbstract
*/
require_once 'Zend/Queue/Adapter/AdapterAbstract.php';
/**
* Class for using connecting to a Zend_Cache-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_Memcacheq extends Zend_Queue_Adapter_AdapterAbstract
{
const DEFAULT_HOST = '127.0.0.1';
const DEFAULT_PORT = 22201;
const EOL = "\r\n";
/**
* @var Memcache
*/
protected $_cache = null;
/**
* @var string
*/
protected $_host = null;
/**
* @var integer
*/
protected $_port = null;
/**
* @var resource
*/
protected $_socket = null;
/********************************************************************
* Constructor / Destructor
*********************************************************************/
/**
* Constructor
*
* @param array|Zend_Config $options
* @param null|Zend_Queue $queue
* @return void
*/
public function __construct($options, Zend_Queue $queue = null)
{
if (!extension_loaded('memcache')) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('Memcache extension does not appear to be loaded');
}
parent::__construct($options, $queue);
$options = &$this->_options['driverOptions'];
if (!array_key_exists('host', $options)) {
$options['host'] = self::DEFAULT_HOST;
}
if (!array_key_exists('port', $options)) {
$options['port'] = self::DEFAULT_PORT;
}
$this->_cache = new Memcache();
$result = $this->_cache->connect($options['host'], $options['port']);
if ($result === false) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('Could not connect to MemcacheQ');
}
$this->_host = $options['host'];
$this->_port = (int)$options['port'];
}
/**
* Destructor
*
* @return void
*/
public function __destruct()
{
if ($this->_cache instanceof Memcache) {
$this->_cache->close();
}
if (is_resource($this->_socket)) {
$cmd = 'quit' . self::EOL;
fwrite($this->_socket, $cmd);
fclose($this->_socket);
}
}
/********************************************************************
* 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)
{
if (empty($this->_queues)) {
$this->getQueues();
}
return in_array($name, $this->_queues);
}
/**
* 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 $timeout default visibility timeout
* @return boolean
* @throws Zend_Queue_Exception
*/
public function create($name, $timeout=null)
{
if ($this->isExists($name)) {
return false;
}
if ($timeout === null) {
$timeout = self::CREATE_TIMEOUT_DEFAULT;
}
// MemcacheQ does not have a method to "create" a queue
// queues are created upon sending a packet.
// We cannot use the send() and receive() functions because those
// depend on the current name.
$result = $this->_cache->set($name, 'creating queue', 0, 15);
$result = $this->_cache->get($name);
$this->_queues[] = $name;
return true;
}
/**
* Delete a queue and all of it's messages
*
* Returns false if the queue is not found, true if the queue exists
*
* @param string $name queue name
* @return boolean
* @throws Zend_Queue_Exception
*/
public function delete($name)
{
$response = $this->_sendCommand('delete ' . $name, array('DELETED', 'NOT_FOUND'), true);
if (in_array('DELETED', $response)) {
$key = array_search($name, $this->_queues);
if ($key !== false) {
unset($this->_queues[$key]);
}
return true;
}
return false;
}
/**
* 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
*/
public function getQueues()
{
$this->_queues = array();
$response = $this->_sendCommand('stats queue', array('END'));
foreach ($response as $i => $line) {
$this->_queues[] = str_replace('STAT ', '', $line);
}
return $this->_queues;
}
/**
* Return the approximate number of messages in the queue
*
* @param Zend_Queue $queue
* @return integer
* @throws Zend_Queue_Exception (not supported)
*/
public function count(Zend_Queue $queue=null)
{
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('count() is not supported in this adapter');
}
/********************************************************************
* Messsage management functions
*********************************************************************/
/**
* Send a message to the queue
*
* @param string $message Message to send to the active queue
* @param Zend_Queue $queue
* @return Zend_Queue_Message
* @throws Zend_Queue_Exception
*/
public function send($message, Zend_Queue $queue=null)
{
if ($queue === null) {
$queue = $this->_queue;
}
if (!$this->isExists($queue->getName())) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('Queue does not exist:' . $queue->getName());
}
$message = (string) $message;
$data = array(
'message_id' => md5(uniqid(rand(), true)),
'handle' => null,
'body' => $message,
'md5' => md5($message),
);
$result = $this->_cache->set($queue->getName(), $message, 0, 0);
if ($result === false) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('failed to insert message into queue:' . $queue->getName());
}
$options = array(
'queue' => $queue,
'data' => $data,
);
$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 $queue
* @return Zend_Queue_Message_Iterator
* @throws Zend_Queue_Exception
*/
public function receive($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;
}
$msgs = array();
if ($maxMessages > 0 ) {
for ($i = 0; $i < $maxMessages; $i++) {
$data = array(
'handle' => md5(uniqid(rand(), true)),
'body' => $this->_cache->get($queue->getName()),
);
$msgs[] = $data;
}
}
$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 (unsupported)
*/
public function deleteMessage(Zend_Queue_Message $message)
{
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('deleteMessage() is not supported in ' . get_class($this));
}
/********************************************************************
* 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' => false,
'getQueues' => true,
'count' => false,
'isExists' => true,
);
}
/********************************************************************
* Functions that are not part of the Zend_Queue_Adapter_Abstract
*********************************************************************/
/**
* sends a command to MemcacheQ
*
* The memcache functions by php cannot handle all types of requests
* supported by MemcacheQ
* Non-standard requests are handled by this function.
*
* @param string $command - command to send to memcacheQ
* @param array $terminator - strings to indicate end of memcacheQ response
* @param boolean $include_term - include terminator in response
* @return array
* @throws Zend_Queue_Exception if connection cannot be opened
*/
protected function _sendCommand($command, array $terminator, $include_term=false)
{
if (!is_resource($this->_socket)) {
$this->_socket = fsockopen($this->_host, $this->_port, $errno, $errstr, 10);
}
if ($this->_socket === false) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception("Could not open a connection to $this->_host:$this->_port errno=$errno : $errstr");
}
$response = array();
$cmd = $command . self::EOL;
fwrite($this->_socket, $cmd);
$continue_reading = true;
while (!feof($this->_socket) && $continue_reading) {
$resp = trim(fgets($this->_socket, 1024));
if (in_array($resp, $terminator)) {
if ($include_term) {
$response[] = $resp;
}
$continue_reading = false;
} else {
$response[] = $resp;
}
}
return $response;
}
}
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