PHP一致性hash分布式算法封装类定义与用法示例

php  /  管理员 发布于 7年前   153

本文实例讲述了PHP一致性hash分布式算法封装类定义与用法。分享给大家供大家参考，具体如下：

一、无虚拟节点实现

myHash($server. '#1');    if(!isset($this->_serverList[$hash])) {      for ($i = 1; $i <= $this->_virtual_node_num; $i++) {        $hash = $this->myHash($server . '#' . $i);        $this->_serverList[$hash] = $server;      }    }    $this->_isSorted = false;    return true;  }  //删除服务器  function removeServer($server){    for ($i = 1; $i <= $this->_virtual_node_num; $i++) {      $hash = $this->myHash($server . '#' . $i);      unset($this->_serverList[$hash]);    }    $this->_isSorted = false;    return true;  }  //获取服务器  function lookup($key){    $hash =$this->myHash($key);    if(!$this->_isSorted){      krsort($this->_serverList,SORT_NUMERIC);      $this->_isSorted = true;    }    foreach($this->_serverList as $pos=>$server){      if($hash >= $pos) return $server;    }    return end($this->_serverList);  }  public function getServerList(){    krsort($this->_serverList,SORT_NUMERIC);    return $this->_serverList;  }}//demo test$hserver = new FlexiHash();//添加服务器$hserver->addServer('192.168.1.1');$hserver->addServer('192.168.1.2');$hserver->addServer('192.168.1.3');$hserver->addServer('192.168.1.4');$hserver->addServer('192.168.1.5');$key1='Key1111';$key2='Key2222';$key2='Key3333';$key2='Key4444';$key2='Key5555';$key2='Key6666';echo "save key1 in server: ".$hserver->lookup($key1).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key2).PHP_EOL;echo "save key1 in server: ".$hserver->lookup($key3).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key4).PHP_EOL;echo "save key1 in server: ".$hserver->lookup($key5).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key6).PHP_EOL;echo "================================================".PHP_EOL;//移除服务器 key值将自动转义到下一台服务器$hserver->removeServer('192.168.1.4');echo "save key1 in server: ".$hserver->lookup($key1).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key2).PHP_EOL;echo "save key1 in server: ".$hserver->lookup($key3).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key4).PHP_EOL;echo "save key1 in server: ".$hserver->lookup($key5).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key6).PHP_EOL;echo "================================================".PHP_EOL;//恢复故障服务器 key值将恢复原来服务器$hserver->addServer('192.168.1.4');echo "save key1 in server: ".$hserver->lookup($key1).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key2).PHP_EOL;echo "save key1 in server: ".$hserver->lookup($key3).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key4).PHP_EOL;echo "save key1 in server: ".$hserver->lookup($key5).PHP_EOL;echo "save key2 in server: ".$hserver->lookup($key6).PHP_EOL;

二、运行结果：

save key1 in server: 192.168.1.4
save key2 in server: 192.168.1.4
save key1 in server: 192.168.1.3
save key2 in server: 192.168.1.3
save key1 in server: 192.168.1.3
save key2 in server: 192.168.1.3
================================================
save key1 in server: 192.168.1.2
save key2 in server: 192.168.1.5
save key1 in server: 192.168.1.3
save key2 in server: 192.168.1.3
save key1 in server: 192.168.1.3
save key2 in server: 192.168.1.3
================================================
save key1 in server: 192.168.1.4
save key2 in server: 192.168.1.4
save key1 in server: 192.168.1.3
save key2 in server: 192.168.1.3
save key1 in server: 192.168.1.3
save key2 in server: 192.168.1.3

PS：这里再为大家提供2款hash相关在线工具供大家参考使用：

在线散列/哈希算法加密工具：
http://tools..net.cn/password/hash_encrypt

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：
http://tools..net.cn/password/hash_md5_sha

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php加密方法总结》、《PHP编码与转码操作技巧汇总》、《PHP数学运算技巧总结》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》、《PHP数据结构与算法教程》、《php程序设计算法总结》及《php正则表达式用法总结》

希望本文所述对大家PHP程序设计有所帮助。

您可能感兴趣的文章:

• 标准PHP的AES加密算法类
• php 地区分类排序算法
• PHP对称加密算法（DES/AES）类的实现代码
• PHP实现的各类hash算法长度及性能测试实例
• PHP排序算法类实例
• PHP经典算法集锦【经典收藏】
• php加密算法之实现可逆加密算法和解密分享
• PHP面试常用算法(推荐)
• PHP mcrypt可逆加密算法分析
• PHP实现的ID混淆算法类与用法示例