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Redis counter class definition and usage
- 小云云Original
- 2018-02-09 09:13:151493browse
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. This article mainly introduces the definition and usage of the PHP-based redis counter class. It analyzes the redis counter class defined by PHP and its related usage techniques in detail in the form of examples. Friends in need can refer to it. I hope it can help you.
Here, 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 ?>
Output:
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);
?>
To test the concurrent execution, we use the ab tool to test, and set the execution to 150 times, 15 concurrency.
ab -c 15 -n 150 http://localhost/test.php
Execution results:
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
You can see that in the case of concurrent calls, the generated count is also guaranteed to be unique.
Related recommendations:
Introduction to redis counter methods to prevent brushing orders
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