一分钟解读php基于redis计数器类

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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

_config = $config;
 $this->_redis = $this->connect();
    }    
    public function incr($key, $incr=1){ return intval($this->_redis->incr($key, $incr));
    }    
    public function get($key){ return intval($this->_redis->get($key));
    }    
    public function reset($key){ return $this->_redis->delete($key);
    }    
    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

 '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：

 '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      01
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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