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<?php |
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/** |
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* Created by PhpStorm. |
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* User: yiranzai |
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* Date: 19-3-23 |
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* Time: 下午3:56 |
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*/ |
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namespace Yiranzai\SnowFlake; |
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/** |
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* Class SnowFlake |
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* @package Yiranzai\SnowFlake |
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*/ |
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final class SnowFlake |
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{ |
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// 41bit timestamp + 5bit dataCenter + 5bit worker + 12bit |
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public const LENGTH = 2 << 5; |
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public const TIMESTAMP_LENGTH = 41; |
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public const DATA_CENTER_LENGTH = 5; |
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public const WORKER_LENGTH = 5; |
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public const SEQUENCE_LENGTH = 12; |
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public const WORKER_LEFT_SHIFT = 12; |
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public const DATA_CENTER_LEFT_SHIFT = 17; |
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public const TIMESTAMP_LEFT_SHIFT = 22; |
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public const MAX_SEQUENCE = (2 << 11) - 1; |
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/** |
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* 最后一次的时间戳 |
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* |
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* @var int |
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*/ |
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private static $lastTimestamp = 0; |
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/** |
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* @var int |
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*/ |
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private static $lastSequence = 0; |
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/** |
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* @var int |
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*/ |
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private static $baseTimestamp = 1553328109824; |
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/** |
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* @param int $dataCenterID |
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* @param int $workerID |
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* @return int |
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*/ |
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public static function next($dataCenterID = 0, $workerID = 0): int |
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{ |
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$timestamp = self::generateTimestamp(); |
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if (self::$lastTimestamp === $timestamp) { |
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++self::$lastSequence; |
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if (self::$lastSequence > self::MAX_SEQUENCE) { |
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$timestamp = self::nextMillisecond(); |
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self::$lastSequence = 0; |
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} |
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} else { |
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self::$lastSequence = 0; |
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} |
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self::$lastTimestamp = $timestamp; |
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$snowFlakeId = (($timestamp - self::$baseTimestamp) << self::TIMESTAMP_LEFT_SHIFT) |
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| ($dataCenterID << self::DATA_CENTER_LEFT_SHIFT) |
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| ($workerID << self::WORKER_LEFT_SHIFT) |
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| self::$lastSequence; |
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return $snowFlakeId; |
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} |
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/** |
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* @param $snowFlakeId |
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* @return Node |
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*/ |
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public static function analysis($snowFlakeId): Node |
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{ |
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$Binary = str_pad(decbin($snowFlakeId), self::LENGTH, '0', STR_PAD_LEFT); |
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$node = new Node(); |
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$node->timestamp = bindec(substr($Binary, 0, self::TIMESTAMP_LENGTH)) |
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+ self::$baseTimestamp; |
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$node->dataCenterID = bindec(substr( |
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$Binary, |
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self::TIMESTAMP_LENGTH + 1, |
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self::DATA_CENTER_LENGTH |
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)); |
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$node->workerID = bindec(substr( |
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$Binary, |
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self::LENGTH - self::DATA_CENTER_LEFT_SHIFT, |
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self::WORKER_LENGTH |
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)); |
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$node->sequence = bindec(substr($Binary, -self::SEQUENCE_LENGTH)); |
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return $node; |
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} |
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/** |
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* @return int |
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*/ |
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private static function nextMillisecond(): int |
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{ |
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$timestamp = self::generateTimestamp(); |
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while ($timestamp <= self::$lastTimestamp) { |
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$timestamp = self::generateTimestamp(); |
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} |
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return $timestamp; |
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} |
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/** |
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* @return int |
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*/ |
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private static function generateTimestamp(): int |
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{ |
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return (int)floor(microtime(true) * 1000); |
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} |
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/** |
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* just test phpunit |
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* |
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* @param int $dataCenterID |
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* @param int $workerID |
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* @return int |
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*/ |
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public static function test($dataCenterID = 0, $workerID = 0): int |
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{ |
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$timestamp = self::generateTimestamp(); |
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if (self::$lastTimestamp === $timestamp) { |
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++self::$lastSequence; |
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if (self::$lastSequence > 10) { |
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$timestamp = self::nextMillisecond(); |
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self::$lastSequence = 0; |
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} |
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} else { |
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self::$lastSequence = 0; |
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} |
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self::$lastTimestamp = $timestamp; |
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$snowFlakeId = (($timestamp - self::$baseTimestamp) << self::TIMESTAMP_LEFT_SHIFT) |
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| ($dataCenterID << self::DATA_CENTER_LEFT_SHIFT) |
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| ($workerID << self::WORKER_LEFT_SHIFT) |
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| self::$lastSequence; |
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return $snowFlakeId; |
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} |
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} |
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yiranzai /
php-snowflake
