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<?php |
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/** |
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* GpsLab component. |
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* |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2011, Peter Gribanov |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace GpsLab\Component\Base64UID\Generator\Binary; |
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use GpsLab\Component\Base64UID\Exception\ArgumentRangeException; |
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use GpsLab\Component\Base64UID\Exception\ArgumentTypeException; |
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use GpsLab\Component\Base64UID\Exception\ZeroArgumentException; |
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class SnowflakeGenerator implements BinaryGenerator |
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{ |
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/** |
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* TODO use private const after drop PHP < 7.1. |
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* |
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* @var int |
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*/ |
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private static $DATA_CENTER_LENGTH = 5; // data center value 0-31 |
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/** |
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* TODO use private const after drop PHP < 7.1. |
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* |
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* @var int |
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*/ |
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private static $MACHINE_LENGTH = 7; // machine value 0-127 |
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/** |
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* TODO use private const after drop PHP < 7.1. |
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* |
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* @var int |
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*/ |
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private static $SEQUENCE_LENGTH = 6; // sequence value 0-63 |
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/** |
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* @var int |
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*/ |
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private $data_center; |
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/** |
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* @var int |
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*/ |
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private $machine; |
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/** |
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* @var int |
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*/ |
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private $time_offset; |
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/** |
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* @var int |
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*/ |
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private $last_time = 0; |
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/** |
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* @var int |
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*/ |
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private $sequence = 0; |
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/** |
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* Snowflake. |
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* |
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* The time offset allows to move the starting point of time in microseconds, |
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* which reduces the size of the stored time: |
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* 0 = 1970-01-01 00:00:00 (UTC) |
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* 1577833200000 = 2020-01-01 00:00:00 (UTC) |
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* |
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* @param int $data_center |
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* @param int $machine |
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* @param int $time_offset |
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*/ |
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public function __construct($data_center, $machine, $time_offset = 0) |
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{ |
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if (!is_int($data_center)) { |
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throw new ArgumentTypeException(sprintf('Data center should be integer, got "%s" instead.', gettype($data_center))); |
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} |
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if (!is_int($machine)) { |
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throw new ArgumentTypeException(sprintf('Machine should be integer, got "%s" instead.', gettype($data_center))); |
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} |
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if (!is_int($time_offset)) { |
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throw new ArgumentTypeException(sprintf('Time offset should be integer, got "%s" instead.', gettype($data_center))); |
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} |
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if ($data_center < 0) { |
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throw new ZeroArgumentException(sprintf('Data center should be grate then "0", got "%d" instead.', $data_center)); |
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} |
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if ($machine < 0) { |
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throw new ZeroArgumentException(sprintf('Machine should be grate then "0", got "%d" instead.', $machine)); |
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} |
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if ($time_offset < 0) { |
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throw new ZeroArgumentException(sprintf('Time offset should be grate then "0", got "%d" instead.', $time_offset)); |
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} |
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$max_data_center = bindec(str_repeat('1', self::$DATA_CENTER_LENGTH)); |
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if ($data_center > $max_data_center) { |
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throw new ArgumentRangeException(sprintf('Data center number should be grate then or equal to "%d", got "%d" instead.', $max_data_center, $data_center)); |
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} |
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$max_machine = bindec(str_repeat('1', self::$MACHINE_LENGTH)); |
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if ($machine > $max_machine) { |
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throw new ArgumentRangeException(sprintf('Data center number should be grate then or equal to "%d", got "%d" instead.', $max_machine, $machine)); |
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} |
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$now = (int) floor(microtime(true) * 1000); |
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if ($time_offset > $now) { |
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throw new ArgumentRangeException(sprintf('Time offset should be grate then or equal to current time "%d", got "%d" instead.', $now, $time_offset)); |
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} |
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$this->data_center = $data_center; |
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$this->machine = $machine; |
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$this->time_offset = $time_offset; |
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} |
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/** |
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* @return int |
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*/ |
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public function generate() |
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{ |
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$time = ((int) floor(microtime(true) * 1000) - $this->time_offset); |
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if ($this->last_time === $time) { |
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++$this->sequence; |
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} else { |
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$this->last_time = $time; |
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} |
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$uid = 1 << 64 - 1; |
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$uid |= $time << self::$DATA_CENTER_LENGTH + self::$MACHINE_LENGTH + self::$SEQUENCE_LENGTH; |
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$uid |= $this->data_center << self::$MACHINE_LENGTH + self::$SEQUENCE_LENGTH; |
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$uid |= $this->machine << self::$SEQUENCE_LENGTH; |
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$uid |= $this->sequence; |
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return $uid; |
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} |
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} |
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gpslab /
base64uid
