Redis是一个开源的使用ANSI C语言编写、支持网络、可基于内存亦可持久化的日志型、Key-Value数据库,并提供多种语言的API。
本文将使用其incr(自增),get(获取),delete(清除)方法来实现计数器类。
1.Redis计数器类代码及演示实例
RedisCounter.class.php
<?php
/**
* PHP基于Redis计数器类
* Date: 2017-10-28 *
* Author: fdipzone
* Version: 1.0
* Descripton:
* php基于Redis实现自增计数,主要使用redis的incr方法,并发执行时保证计数自增唯一。
* Func: * public incr 执行自增计数并获取自增后的数值
* public get 获取当前计数
* public reset 重置计数
* private connect 创建redis连接
*/
class RedisCounter{
// class start
private $_config;
private $_redis;
/**
* 初始化
* @param Array $config redis连接设定
*/
public function __construct($config){
$this->_config = $config;
$this->_redis = $this->connect();
}
/**
* 执行自增计数并获取自增后的数值
* @param String $key 保存计数的键值
* @param Int $incr 自增数量,默认为1
* @return Int
*/
public function incr($key, $incr=1){
return intval($this->_redis->incr($key, $incr));
}
/**
* 获取当前计数
* @param String $key 保存计数的健值
* @return Int
*/
public function get($key){
return intval($this->_redis->get($key));
}
/**
* 重置计数
* @param String $key 保存计数的健值
* @return Int
*/
public function reset($key){
return $this->_redis->delete($key);
}
/**
*创建redis连接
*@return Link
*/
private function connect(){
try{
$redis = new Redis();
$redis->connect($this->_config['host'],$this->_config['port'],$this->_config['timeout'],$this->_config['reserved'],$this->_config['retry_interval']);
if(empty($this->_config['auth'])){
$redis->auth($this->_config['auth']);
}
$redis->select($this->_config['index']);
}catch(RedisException $e){ throw new Exception($e->getMessage()); return false; }return $redis;
}}
// class end
?>
*/
demo.php
<?php
Require 'RedisCounter.class.php';
// redis连接设定
$config = array(
'host' => 'localhost',
'port' => 6379,
'index' => 0,
'auth' => '',
'timeout' => 1,
'reserved' => NULL,
'retry_interval' => 100,
);
// 创建RedisCounter对象
$oRedisCounter = new RedisCounter($config);
// 定义保存计数的健值
$key = 'mycounter';
// 执行自增计数,获取当前计数,重置计数
echo $oRedisCounter->get($key).PHP_EOL;
// 0echo
$oRedisCounter->incr($key).PHP_EOL;
// 1echo
$oRedisCounter->incr($key, 10).PHP_EOL;
// 11echo
$oRedisCounter->reset($key).PHP_EOL;
// 1echo
$oRedisCounter->get($key).PHP_EOL;
// 0
?>
输出:
011110
2.并发调用计数器,检查计数唯一性
测试代码如下:
<?php
Require 'RedisCounter.class.php';
// redis连接设定
$config = array(
'host' => 'localhost',
'port' => 6379,
'index' => 0,
'auth' => '',
'timeout' => 1,
'reserved' => NULL,
'retry_interval' => 100,
);
// 创建RedisCounter对象
$oRedisCounter = new RedisCounter($config);
// 定义保存计数的健值
$key = 'mytestcounter';
// 执行自增计数并返回自增后的计数,记录入临时文件
file_put_contents('/tmp/mytest_result.log', $oRedisCounter->incr($key).PHP_EOL, FILE_APPEND);
?>
测试并发执行,我们使用ab工具进行测试,设置执行150次,15个并发。
ab -c 15 -n 150 http://localhost/test.php
执行结果:
ab -c 15 -n 150 http://localhost/test.php
This is ApacheBench, Version 2.3 <$Revision: 1554214 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking home.rabbit.km.com (be patient).....doneServer Software: nginx/1.6.3Server Hostname: localhostServer Port: 80Document Path: /test.phpDocument Length: 0 bytesConcurrency Level: 15Time taken for tests: 0.173 secondsComplete requests: 150Failed requests: 0Total transferred: 24150 bytesHTML transferred: 0 bytesRequests per second: 864.86 [#/sec] (mean)Time per request: 17.344 [ms] (mean)Time per request: 1.156 [ms] (mean, across all concurrent requests)Transfer rate: 135.98 [Kbytes/sec] receivedConnection Times (ms) min mean[+/-sd] median maxConnect: 0 0 0.2 0 1Processing: 3 16 3.2 16 23Waiting: 3 16 3.2 16 23Total: 4 16 3.1 17 23Percentage of the requests served within a certain time (ms) 50% 17 66% 18 75% 18 80% 19 90% 20 95% 21 98% 22 99% 22 100% 23 (longest request)
检查计数是否唯一
生成的总计数wc -l /tmp/mytest_result.log 150 /tmp/mytest_result.log生成的唯一计数sort -u /tmp/mytest_result.log | wc -l 150
可以看到在并发调用的情况下,生成的计数也保证唯一。
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