Heim > php教程 > PHP源码 > Hauptteil

100%并发无误, PHP高效文本缓存类.

PHP中文网
Freigeben: 2016-05-25 17:06:13
Original
1077 Leute haben es durchsucht

代码

<?php

$old = sprintf(&#39;%1.4f&#39;, memory_get_peak_usage() / 1024) .&#39; KB&#39;;

class caches{
    public  $keep_time = 3600;
    public  $file_path = &#39;./cache.txt&#39;;
    private $handle    = null;
    private $time      = 0;
    public function __construct(){
        $this->time = time();
    }
    
    public function read($key, $keep_time=0){
        # 取得第一行. 判断过期, 不存在, 异常情况, 影响返回值即可. 返回值决定write方法的调用.
        $keep_time === 0 && $keep_time = $this->keep_time;
        $list = $this->__get_one();
        
        # 是否更新判断.
            $check = true;
        if(!$list[$key])
            $check = false;
        if($check && (time() - $list[$key][&#39;t&#39;]) >= $keep_time)
             $check = false;
        
        # 取得第几行数据. 
        $line = $list[$key][&#39;l&#39;]+0;
        $i = 1;
        $data = &#39;&#39;;
        if($this->handle){
            while(!feof($this->handle)){
                if($i === $line){
                   $data = fgets($this->handle);
                }else{
                    // TODO: 有没有好办法跳过这步...
                   fgets($this->handle);
                }
                $i ++;
            }
        }
        
        # 无论如何都保障数据为数组返回.
        if($data){
            $data = $this->__data_parse($data,&#39;DECODE&#39;);
        }
        !$data && $data = array();
        return $data;
    }
    public function write($key, $val){
        # 取得第一行. 判断key是否已经存在了..
        $list = $this->__get_one();
        
        # 什么情况下可以写入.
        if($list[$key]){
            # 已经过期的情况下. write函数被调用后, 不管如何都当作过期.
            $list[$key][&#39;t&#39;] = $this->time;
            $list[&#39;end&#39;] = $list[$key][&#39;l&#39;];
        }else{
            $list[$key] = array(&#39;t&#39;=>$this->time,&#39;l&#39;=>($list[&#39;end&#39;]+1));
            $list[&#39;end&#39;] = $list[$key][&#39;l&#39;];
        }
        
        # 数据加密处理后再传给__write. $list[&#39;end&#39;] 表示更新哪一行. 
        return $this->__write($list[&#39;end&#39;], $this->__data_parse($val), serialize($list));
    }
    
    private function __get_one(){
        $this->__read_fopens();

        if(!$this->handle)
            return array();
        $list = array();
        if($seria = rtrim(fgets($this->handle))){
            $list = unserialize($seria);
            unset($seria);
        }
        
        !$list && $list = array();
        return $list;
    }
    
    private function __data_parse($data, $cls=&#39;ENCODE&#39;){
        # $State 参数以减少is_string, count两函数的调用.
        if($cls === &#39;ENCODE&#39;){
            # 一定要返回无换行的一行. 切记
            # gzcompress 非常占内存, 只是写入时执行.
            $data = base64_encode(gzcompress(serialize($data),9));
        }else{
            $data = unserialize(gzuncompress(base64_decode(rtrim($data))));
            if($State === false && count($data) === 1 && isset($data[0]) === true){
                $data = $data[0];
            }
        }
        return $data;
    }
    
    private function __write($line, $data, $firstline){
        $savedata = array();
        $line +=0;
        $i = 1;
        $savedata[0] = $firstline;
        if($this->handle){
            while(!feof($this->handle)){
                $savedata[$i] = rtrim(fgets($this->handle));
                if($i === $line){
                    $savedata[$i]= $data;
                }
                $i ++;
            }
        }
        
        if(!$savedata[$line])
            $savedata[$line] = $data;
        
        if($this->handle)
            $this->__closes();
            
        # 重新写入文件.
        if(!$fp = fopen($this->file_path, &#39;wb&#39;))
        if(!$fp = fopen($this->file_path, &#39;wb&#39;))
        if(!$fp = fopen($this->file_path, &#39;wb&#39;))
        if(!$fp = fopen($this->file_path, &#39;wb&#39;))
        if(!$fp = fopen($this->file_path, &#39;wb&#39;))
            return 0;
        
        flock($fp, LOCK_EX | LOCK_NB);
        $ints = 0;
        //$ints = fwrite($fp, implode(PHP_EOL, $savedata));
        foreach($savedata AS $key => $val){
            if($key === 0){
                $ints += fwrite($fp,$val);
            }else{
                $ints += fwrite($fp,PHP_EOL.$val);
            }
            if($key === 0 && $ints <= 0)
                break;
        }
        unset($savedata);
        flock($fp, LOCK_UN);
        fclose($fp);
        
        return $ints;
    }
    
    private function __read_fopens(){
        $cls = &#39;rb&#39;;
        if($this->handle)
            $this->__closes();
        if(is_file($this->file_path) === false)
            return false;
        
       if(!$this->handle = fopen($this->file_path,$cls))
       if(!$this->handle = fopen($this->file_path,$cls))
       if(!$this->handle = fopen($this->file_path,$cls))
       if(!$this->handle = fopen($this->file_path,$cls))
       if(!$this->handle = fopen($this->file_path,$cls))
            $this->handle = null;
       if($this->handle)
       flock($this->handle,LOCK_EX | LOCK_NB);
    }
    private function __closes(){
        if($this->handle){
            flock($this->handle, LOCK_UN);
            fclose($this->handle);
            $this->handle = null;
        }
    }
}

########################################### 调用代码 #########################################
set_time_limit(0);
$atime = microtime(true);
$obj = new caches();

$read = 1;  // (0 / 1) 写入或者读, 测试效果.
$size = 10000; // 10K
$arr = range(1,100);  // 首次要快得多, 200:1秒, 1000:11秒
foreach($arr AS $val){
    if($read == 0){
        // 写入测试.
        $ints = $obj->write(&#39;key&#39;.$val,array(&#39;key&#39;=>str_repeat(&#39;A&#39;,$size)));
        echo &#39;key&#39;.$val.&#39; write size: &#39;. ($ints / 1000).&#39; KB<br />&#39;;
    }else{
        // 读缓存测试.
        $ints = $obj->read(&#39;key&#39;.$val);
        echo &#39;key&#39;.$val.&#39; read size: &#39;. strlen($ints[&#39;key&#39;]) / 1000 .&#39; KB<br />&#39;;
    }
}


#################################### 以下代码为监控作用 ####################################
echo &#39;<br />执行时间: &#39;;
echo sprintf(&#39;%1.4f&#39;,microtime(true) - $atime).&#39; 秒&#39;;

echo &#39;<br><br><br><br><hr>内存监控: &#39;;
echo $new = sprintf(&#39;%1.4f&#39;, memory_get_peak_usage() / 1024) .&#39; KB&#39;;
echo &#39;<br><hr>原始内存: &#39;;
echo $old;
echo &#39;<br><hr>增加内存: &#39;;
echo sprintf(&#39;%1.4f&#39;,$new - $old) .&#39; KB&#39;;
exit();
?>
Nach dem Login kopieren
Quelle:php.cn
Erklärung dieser Website
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn
Beliebte Empfehlungen
Beliebte Tutorials
Mehr>
Neueste Downloads
Mehr>
Web-Effekte
Quellcode der Website
Website-Materialien
Frontend-Vorlage