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Detailed explanation of the steps to use the redis counter class
Detailed explanation of the steps to use the redis counter class
This time I will bring you a detailed explanation of the steps to use the redis counter class. What are the precautions when using the redis counter class? Here are practical cases, let’s take a look.
Redis is an open source log-type Key-Value database written in ANSI C language, supports network, can be memory-based and persistent, and provides APIs in multiple languages.
Here we use its incr(increment),get(get),delete(clear)methods to implement the counter class.
1.Redis counter class code and demonstration example
##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; // 0 echo $oRedisCounter->incr($key).PHP_EOL; // 1 echo $oRedisCounter->incr($key, 10).PHP_EOL; // 11 echo $oRedisCounter->reset($key).PHP_EOL; // 1 echo $oRedisCounter->get($key).PHP_EOL; // 0 ?>
0 1 11 1 0
2. Concurrent call counter, Check the uniqueness of the count
The test code is as follows:<?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);
?>ab tool to test, set execution150 times, 15 concurrency.
ab -c 15 -n 150 http://localhost/test.php
Execution result:
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).....done Server Software: nginx/1.6.3 Server Hostname: localhost Server Port: 80 Document Path: /test.php Document Length: 0 bytes Concurrency Level: 15 Time taken for tests: 0.173 seconds Complete requests: 150 Failed requests: 0 Total transferred: 24150 bytes HTML transferred: 0 bytes Requests 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] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.2 0 1 Processing: 3 16 3.2 16 23 Waiting: 3 16 3.2 16 23 Total: 4 16 3.1 17 23 Percentage 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)
Check whether the count is unique
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
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