redis计数器类定义与用法

这里 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; // 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
?>

输出：

0
1
11
1
0

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).....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)

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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