php 写一个漏桶算法
时间: 2023-05-23 22:03:20 浏览: 57
<?php
class LeakyBucketAlgorithm {
private $bucketSize;
private $rateLimit;
private $currentBucketSize;
private $lastBucketUpdatedTime;
public function __construct(int $bucketSize, $rateLimit)
{
$this->bucketSize = $bucketSize;
$this->rateLimit = $rateLimit;
$this->currentBucketSize = $bucketSize;
$this->lastBucketUpdatedTime = time();
}
public function pour(int $size): bool
{
$this->updateBucket();
if($size < $this->currentBucketSize) {
$this->currentBucketSize -= $size;
return true;
} else {
return false;
}
}
private function updateBucket(): void
{
$currentTime = time();
$timeSinceLastUpdate = $currentTime - $this->lastBucketUpdatedTime;
$this->lastBucketUpdatedTime = $currentTime;
$newBucketSize = $this->currentBucketSize + $timeSinceLastUpdate * $this->rateLimit;
if($newBucketSize > $this->bucketSize){
$this->currentBucketSize = $this->bucketSize;
} else {
$this->currentBucketSize = $newBucketSize;
}
}
}
# Example usage
$leakyBucketAlgorithm = new LeakyBucketAlgorithm(1000, 10);
for($i = 1; $i <= 12; $i++) {
if($leakyBucketAlgorithm->pour(500)){
echo "Request $i was successful\n";
} else {
echo "Request $i was unsuccessful\n";
}
}
?>
这是一个简单的 php 漏桶算法的实现,可以通过调用 pour 方法来实现对请求的限流。
但是需要注意的是,这个实现没有考虑分布式系统中的限流问题,如果需要在分布式系统中实现限流,建议使用基于 Redis 或者类似服务的分布式限流算法。