php 基于redis计数器类

来源:转载

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

<?phpRequire '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:

<?phpRequire '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.phpThis 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。


源码下载地址:点击查看

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