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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
* @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: Queue.php 18951 2009-11-12 16:26:19Z alexander $
*/
/**
* Class for connecting to queues performing common operations.
*
* @category Zend
* @package Zend_Queue
* @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 implements Countable
{
/**
* Use the TIMEOUT constant in the config of a Zend_Queue
*/
const TIMEOUT = 'timeout';
/**
* Default visibility passed to count
*/
const VISIBILITY_TIMEOUT = 30;
/**
* Use the NAME constant in the config of Zend_Queue
*/
const NAME = 'name';
/**
* @var Zend_Queue_Adapter_AdapterInterface
*/
protected $_adapter = null;
/**
* User-provided configuration
*
* @var array
*/
protected $_options = array();
/**
* Zend_Queue_Message class
*
* @var string
*/
protected $_messageClass = 'Zend_Queue_Message';
/**
* Zend_Queue_Message_Iterator class
*
* @var string
*/
protected $_messageSetClass = 'Zend_Queue_Message_Iterator';
/**
* @var Zend_Log
*/
protected $_logger = null;
/**
* Constructor
*
* Can be called as
* $queue = new Zend_Queue($config);
* - or -
* $queue = new Zend_Queue('array', $config);
* - or -
* $queue = new Zend_Queue(null, $config); // Zend_Queue->createQueue();
*
* @param string|Zend_Queue_Adapter|array|Zend_Config|null String or adapter instance, or options array or Zend_Config instance
* @param Zend_Config|array $options Zend_Config or a configuration array
* @return void
*/
public function __construct($spec, $options = array())
{
$adapter = null;
if ($spec instanceof Zend_Queue_Adapter_AdapterInterface) {
$adapter = $spec;
} elseif (is_string($spec)) {
$adapter = $spec;
} elseif ($spec instanceof Zend_Config) {
$options = $spec->toArray();
} elseif (is_array($spec)) {
$options = $spec;
}
// last minute error checking
if ((null === $adapter)
&& (!is_array($options) && (!$options instanceof Zend_Config))
) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('No valid params passed to constructor');
}
// Now continue as we would if we were a normal constructor
if ($options instanceof Zend_Config) {
$options = $options->toArray();
} elseif (!is_array($options)) {
$options = array();
}
// Make sure we have some defaults to work with
if (!isset($options[self::TIMEOUT])) {
$options[self::TIMEOUT] = self::VISIBILITY_TIMEOUT;
}
// Make sure all defaults are appropriately set.
if (!array_key_exists('timeout', $options)) {
$options[self::TIMEOUT] = self::VISIBILITY_TIMEOUT;
}
if (array_key_exists('messageClass', $options)) {
$this->setMessageClass($options['messageClass']);
}
if (array_key_exists('messageSetClass', $options)) {
$this->setMessageSetClass($options['messageSetClass']);
}
$this->setOptions($options);
// if we were passed an adapter we either build the $adapter or use it
if (null !== $adapter) {
$this->setAdapter($adapter);
}
}
/**
* Set queue options
*
* @param array $options
* @return Zend_Queue
*/
public function setOptions(array $options)
{
$this->_options = array_merge($this->_options, $options);
return $this;
}
/**
* Set an individual configuration option
*
* @param string $name
* @param mixed $value
* @return Zend_Queue
*/
public function setOption($name, $value)
{
$this->_options[(string) $name] = $value;
return $this;
}
/**
* Returns the configuration options for the queue
*
* @return array
*/
public function getOptions()
{
return $this->_options;
}
/**
* Determine if a requested option has been defined
*
* @param string $name
* @return bool
*/
public function hasOption($name)
{
return array_key_exists($name, $this->_options);
}
/**
* Retrieve a single option
*
* @param string $name
* @return null|mixed Returns null if option does not exist; option value otherwise
*/
public function getOption($name)
{
if ($this->hasOption($name)) {
return $this->_options[$name];
}
return null;
}
/**
* Set the adapter for this queue
*
* @param string|Zend_Queue_Adapter_AdapterInterface $adapter
* @return Zend_Queue Provides a fluent interface
*/
public function setAdapter($adapter)
{
if (is_string($adapter)) {
if (null === ($adapterNamespace = $this->getOption('adapterNamespace'))) {
$adapterNamespace = 'Zend_Queue_Adapter';
}
$adapterName = str_replace(
' ',
'_',
ucwords(
str_replace(
'_',
' ',
strtolower($adapterNamespace . '_' . $adapter)
)
)
);
if (!class_exists($adapterName)) {
require_once 'Zend/Loader.php';
Zend_Loader::loadClass($adapterName);
}
/*
* Create an instance of the adapter class.
* Pass the configuration to the adapter class constructor.
*/
$adapter = new $adapterName($this->getOptions(), $this);
}
if (!$adapter instanceof Zend_Queue_Adapter_AdapterInterface) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception("Adapter class '" . get_class($adapterName) . "' does not implement Zend_Queue_Adapter_AdapterInterface");
}
$this->_adapter = $adapter;
$this->_adapter->setQueue($this);
if (null !== ($name = $this->getOption(self::NAME))) {
$this->_setName($name);
}
return $this;
}
/**
* Get the adapter for this queue
*
* @return Zend_Queue_Adapter_AdapterInterface
*/
public function getAdapter()
{
return $this->_adapter;
}
/**
* @param string $className
* @return Zend_Queue Provides a fluent interface
*/
public function setMessageClass($className)
{
$this->_messageClass = (string) $className;
return $this;
}
/**
* @return string
*/
public function getMessageClass()
{
return $this->_messageClass;
}
/**
* @param string $className
* @return Zend_Queue Provides a fluent interface
*/
public function setMessageSetClass($className)
{
$this->_messageSetClass = (string) $className;
return $this;
}
/**
* @return string
*/
public function getMessageSetClass()
{
return $this->_messageSetClass;
}
/**
* Get the name of the queue
*
* Note: _setName() used to exist, but it caused confusion with createQueue
* Will evaluate later to see if we should add it back in.
*
* @return string
*/
public function getName()
{
return $this->getOption(self::NAME);
}
/**
* Create a new queue
*
* @param string $name queue name
* @param integer $timeout default visibility timeout
* @return Zend_Queue|false
* @throws Zend_Queue_Exception
*/
public function createQueue($name, $timeout = null)
{
if (!is_string($name)) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('$name is not a string');
}
if ((null !== $timeout) && !is_integer($timeout)) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('$timeout must be an integer');
}
// Default to standard timeout
if (null === $timeout) {
$timeout = $this->getOption(self::TIMEOUT);
}
// Some queues allow you to create on the fly, but cannot return
// a list of queues. Stomp protocol for example.
if ($this->isSupported('create')) {
if ($this->getAdapter()->isExists($name)) {
return false;
}
if (!$this->getAdapter()->create($name, $timeout)) {
return false;
}
}
$options = array(
self::NAME => $name,
'timeout' => $timeout
);
return new self($this->getAdapter(), $options);
}
/**
* Delete the queue this object is working on.
*
* This queue is disabled, regardless of the outcome of the deletion
* of the queue, because the programmers intent is to disable this queue.
*
* @return boolean
*/
public function deleteQueue()
{
if ($this->isSupported('delete')) {
$deleted = $this->getAdapter()->delete($this->getName());
}
else {
$deleted = true;
}
/**
* @see Zend_Queue_Adapter_Null
*/
require_once('Zend/Queue/Adapter/Null.php');
$this->setAdapter(new Zend_Queue_Adapter_Null($this->getOptions()));
return $deleted;
}
/**
* Delete a message from the queue
*
* Returns true if the message is deleted, false if the deletion is
* unsuccessful.
*
* Returns true if the adapter doesn't support message deletion.
*
* @param Zend_Queue_Message $message
* @return boolean
* @throws Zend_Queue_Exception
*/
public function deleteMessage(Zend_Queue_Message $message)
{
if ($this->getAdapter()->isSupported('deleteMessage')) {
return $this->getAdapter()->deleteMessage($message);
}
return true;
}
/**
* Send a message to the queue
*
* @param mixed $message message
* @return Zend_Queue_Message
* @throws Zend_Queue_Exception
*/
public function send($message)
{
return $this->getAdapter()->send($message);
}
/**
* Returns the approximate number of messages in the queue
*
* @return integer
*/
public function count()
{
if ($this->getAdapter()->isSupported('count')) {
return $this->getAdapter()->count();
}
return 0;
}
/**
* Return the first element in the queue
*
* @param integer $maxMessages
* @param integer $timeout
* @return Zend_Queue_Message_Iterator
*/
public function receive($maxMessages=null, $timeout=null)
{
if (($maxMessages !== null) && !is_integer($maxMessages)) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('$maxMessages must be an integer or null');
}
if (($timeout !== null) && !is_integer($timeout)) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('$timeout must be an integer or null');
}
// Default to returning only one message
if ($maxMessages === null) {
$maxMessages = 1;
}
// Default to standard timeout
if ($timeout === null) {
$timeout = $this->getOption(self::TIMEOUT);
}
return $this->getAdapter()->receive($maxMessages, $timeout);
}
/**
* 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 $this->getAdapter()->getCapabilities();
}
/**
* Indicates if a function is supported or not.
*
* @param string $name
* @return boolean
*/
public function isSupported($name)
{
$translation = array(
'deleteQueue' => 'delete',
'createQueue' => 'create'
);
if (isset($translation[$name])) {
$name = $translation[$name];
}
return $this->getAdapter()->isSupported($name);
}
/**
* Get an array of all available queues
*
* @return array
* @throws Zend_Queue_Exception
*/
public function getQueues()
{
if (!$this->isSupported('getQueues')) {
throw new Zend_Queue_Exception( __FUNCTION__ . '() is not supported by ' . get_class($this->getAdapter()));
}
return $this->getAdapter()->getQueues();
}
/**
* Set the name of the queue
*
* This is AN UNSUPPORTED FUNCTION
*
* @param string $name
* @return Zend_Queue|false Provides a fluent interface
*/
protected function _setName($name)
{
if (!is_string($name)) {
/**
* @see Zend_Queue_Exception
*/
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception("$name is not a string");
}
if ($this->getAdapter()->isSupported('create')) {
if (!$this->getAdapter()->isExists($name)) {
$timeout = $this->getOption(self::TIMEOUT);
if (!$this->getAdapter()->create($name, $timeout)) {
// Unable to create the new queue
return false;
}
}
}
$this->setOption(self::NAME, $name);
return $this;
}
/**
* returns a listing of Zend_Queue details.
* useful for debugging
*
* @return array
*/
public function debugInfo()
{
$info = array();
$info['self'] = get_class($this);
$info['adapter'] = get_class($this->getAdapter());
foreach ($this->getAdapter()->getCapabilities() as $feature => $supported) {
$info['adapter-' . $feature] = ($supported) ? 'yes' : 'no';
}
$info['options'] = $this->getOptions();
$info['options']['driverOptions'] = '[hidden]';
$info['currentQueue'] = $this->getName();
$info['messageClass'] = $this->getMessageClass();
$info['messageSetClass'] = $this->getMessageSetClass();
return $info;
}
}
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