php-beanstalkd消息队列类实例分享

/**

• An interface to the beanstalk queue service. Implements the beanstalk
• protocol spec 1.9. Where appropriate the documentation from the protocol
• has been added to the docblocks in this class.
• @link https://github.com/kr/beanstalkd/blob/master/doc/protocol.txt
  */
  class BeanStalk {

/**

• Minimum priority value which can be assigned to a job. The minimum
• priority value is also the highest priority a job can have.
• @var integer
  */
  const MIN_PRIORITY = 0;

/**

• Maximum priority value which can be assigned to a job. The maximum
• priority value is also the lowest priority a job can have.
• @var integer
  */
  const MAX_PRIORITY = 4294967295;

/**

• Holds a boolean indicating whether a connection to the server is
• currently established or not.
• @var boolean
  */
  public $connected = false;

/**

• Holds configuration values.
• @var array
  */
  protected $_config = [];

/**

• The current connection resource handle (if any).
• @var resource
  */
  protected $_connection;

/**

• Constructor.
• @param array $config An array of configuration values:
• • 'persistent' Whether to make the connection persistent or
• not,defaults to true as the FAQ recommends
• persistent connections.
• • 'host' The beanstalk server hostname or IP address to
• connect to,defaults to 127.0.0.1.
• • 'port' The port of the server to connect to,defaults
• to 11300.
• • 'timeout' Timeout in seconds when establishing the
• connection,defaults to 1.
• • 'logger' An instance of a PSR-3 compatible logger.
• @link https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
• @return void
  */
  public function __construct(array $config = []) {
  $defaults = [
  'persistent' => true,'host' => '127.0.0.1','port' => 11300,'timeout' => 1,'logger' => null
  ];
  $this->_config = $config + $defaults;
  }

/**

• Destructor,disconnects from the server.
• @return void
  */
  public function __destruct() {
  $this->disconnect();
  }

/**

• Initiates a socket connection to the beanstalk server. The resulting
• stream will not have any timeout set on it. Which means it can wait
• an unlimited amount of time until a packet becomes available. This
• is required for doing blocking reads.
• @see BeanstalkClient::$_connection
• @see BeanstalkClient::reserve()
• @return boolean true if the connection was established,false otherwise.
  */
  public function connect() {
  if (isset($this->_connection)) {
  $this->disconnect();
  }
  $errNum = '';
  $errStr = '';
  $function = $this->_config['persistent'] ? 'pfsockopen' : 'fsockopen';
  $params = [$this->_config['host'],$this->_config['port'],&$errNum,&$errStr];

if ($this->_config['timeout']) {
  $params[] = $this->_config['timeout'];
}
$this->_connection = @call_user_func_array($function,$params);

if (!empty($errNum) || !empty($errStr)) {
  $this->_error("{$errNum}: {$errStr}");
}

$this->connected = is_resource($this->_connection);

if ($this->connected) {
  stream_set_timeout($this->_connection,-1);
}
return $this->connected;

}

/**

• Closes the connection to the beanstalk server by first signaling

• that we want to quit then actually closing the socket connection.

• @return boolean true if diconnecting was successful.
  */
  public function disconnect() {
  if (!is_resource($this->_connection)) {
  $this->connected = false;
  } else {
  $this->_write('quit');
  $this->connected = !fclose($this->_connection);

  if (!$this->connected) {
  $this->_connection = null;
  }
  }
  return !$this->connected;
  }

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