這次給大家帶來redis計數器類使用步驟詳解,redis計數器類使用的注意事項有哪些,下面就是實戰案例,一起來看一下。
Redis是一個開源的使用ANSI C語言編寫、支援網路、可基於記憶體亦可持久化的日誌型、Key-Value資料庫,並提供多種語言的API。
這裡使用其incr(自增),get(擷取),delete(清除)方法來實現計數器類。
1.Redis計數器類代碼及示範執行個體
RedisCounter.class.php
<?php/** * PHP基於Redis計數器類 * Date: 2017-10-28 * Author: fdipzone * Version: 1.0 * * Descripton: * php基於Redis實現自增計數,主要使用redis的incr方法,並發執行時保證計數自增唯一。 * * Func: * public incr 執行自增計數並擷取自增後的數值 * public get 擷取當前計數 * public reset 重設計數 * private connect 建立redis串連 */class RedisCounter{ // class start private $_config; private $_redis; /** * 初始化 * @param Array $config redis串連設定 */ public function construct($config){ $this->_config = $config; $this->_redis = $this->connect(); } /** * 執行自增計數並擷取自增後的數值 * @param String $key 儲存計數的索引值 * @param Int $incr 自增數量,預設為1 * @return Int */ public function incr($key, $incr=1){ return intval($this->_redis->incr($key, $incr)); } /** * 擷取當前計數 * @param String $key 儲存計數的健值 * @return Int */ public function get($key){ return intval($this->_redis->get($key)); } /** * 重設計數 * @param String $key 儲存計數的健值 * @return Int */ public function reset($key){ return $this->_redis->delete($key); } /** * 建立redis串連 * @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 $redis; }} // class end?>
demo.php
<?phpRequire 'RedisCounter.class.php';// redis串連設定$config = array( 'host' => 'localhost', 'port' => 6379, 'index' => 0, 'auth' => '', 'timeout' => 1, 'reserved' => NULL, 'retry_interval' => 100,);// 建立RedisCounter對象$oRedisCounter = new RedisCounter($config);// 定義儲存計數的健值$key = 'mycounter';// 執行自增計數,擷取當前計數,重設計數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?>
輸出:
011110
2.並發調用計數器,檢查計數唯一性
測試代碼如下:
<?phpRequire 'RedisCounter.class.php';// redis串連設定$config = array( 'host' => 'localhost', 'port' => 6379, 'index' => 0, 'auth' => '', 'timeout' => 1, 'reserved' => NULL, 'retry_interval' => 100,);// 建立RedisCounter對象$oRedisCounter = new RedisCounter($config);// 定義儲存計數的健值$key = 'mytestcounter';// 執行自增計數並返回自增後的計數,記錄入臨時檔案file_put_contents('/tmp/mytest_result.log', $oRedisCounter->incr($key).PHP_EOL, FILE_APPEND);?>
測試並發執行,我們使用ab工具進行測試,設定執行150次,15個並發。
ab -c 15 -n 150 http://localhost/test.php
執行結果:
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)
檢查計數是否唯一
產生的總計數wc -l /tmp/mytest_result.log 150 /tmp/mytest_result.log產生的唯一計數sort -u /tmp/mytest_result.log | wc -l 150
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