Gearman+PHP实现分布式对象调用

Gearman &＃43; PHP 实现分布式对象调用

http://netkiller.github.io/journal/gearman.php.html

Mr. Neo Chen (netkiller), 陈景峰(BG7NYT)

中国广东省深圳市龙华新区民治街道溪山美地
518131
&＃43;86 13113668890
&＃43;86 755 29812080

$Id$

$Date$

摘要

在群里看到有网友问&＃xff0c;IDC的服务器是否需要开启防火墙&＃xff0c;我意识到应该写一篇关于IDC安全的文章。

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1. Gearman Job Server
2. Gearman PHP扩展
3. 参数传递与返回值

1. Gearman Job Server

文本格式回复

yum install gearmand

2. Gearman PHP扩展

PHP扩展安装

#!/bin/bash
yum install libgearman-devel -y
pecl install gearman
cat >> /srv/php/etc/conf.d/gearman.ini <extension&＃61;gearman.so
EOF

确认模块是否安装&＃xff0c;同时检查gearman扩展的版本。

# php -m | grep gearman
gearman
# php -r &＃39;printf("%s\r\n",gearman_version());&＃39;
1.1.8

测试脚本 server.php

$worker&＃61; new GearmanWorker();
$worker->addServer();
$worker->addFunction("reverse", "my_reverse_function");
while ($worker->work());
function my_reverse_function($job)
{
return strrev($job->workload());
}
?>

测试脚本 client.php

$client&＃61; new GearmanClient();
$client->addServer();
print $client->doNormal("reverse", "Hello World!");
?>

我用&＃39;o&＃39; 表示与上次备份中有差异的部分。

3. 参数传递与返回值

Gearman 向functon 传递参数只能通过$job->workload(), 而 $job->workload() 只能传递字符串。

如果托传递多个参数&＃xff0c;需要将参数序列化后传递

返回值也一样&＃xff0c;一个字符串可以直接返回&＃xff0c;如果返回数字类型是不允许的&＃xff0c;需要序列化处理

例 1. 多参数传递与返回值实例

Server

require &＃39;Doctrine/Common/ClassLoader.php&＃39;;
use Doctrine\Common\ClassLoader;
use Doctrine\DBAL\DriverManager;
use Doctrine\DBAL\Configuration;
$classLoader &＃61; new ClassLoader(&＃39;Doctrine&＃39;, &＃39;/www/DoctrineDBAL-2.3.4/&＃39;);
$classLoader->register();
$config &＃61; new Configuration();
$connectionParams &＃61; array(
&＃39;dbname&＃39; &＃61;> &＃39;example&＃39;,
&＃39;user&＃39; &＃61;> &＃39;www&＃39;,
&＃39;password&＃39; &＃61;> &＃39;password&＃39;,
&＃39;host&＃39; &＃61;> &＃39;192.168.2.1&＃39;,
&＃39;driver&＃39; &＃61;> &＃39;pdo_mysql&＃39;,
);
$conn &＃61; DriverManager::getConnection($connectionParams, $config);
$host &＃61; &＃39;127.0.0.1&＃39;;
$port &＃61; 4730;
echo "Starting\n";
# Create our worker object.
$gmworker&＃61; new GearmanWorker();
# Add default server (localhost).
$gmworker->addServer($host, $port);
# Register function "reverse" with the server. Change the worker function to
# "reverse_fn_fast" for a faster worker with no output.
$gmworker->addFunction("members", "members");
print "Waiting for job...\n";
while($gmworker->work())
{
if ($gmworker->returnCode() !&＃61; GEARMAN_SUCCESS)
{
echo "return_code: " . $gmworker->returnCode() . "\n";
break;
}
}
function members($job)
{
global $conn;
$param &＃61; unserialize($job->workload());
print_r($param);
$sql &＃61; "SELECT username FROM members limit ".$param[&＃39;limit&＃39;].",".$param[&＃39;offset&＃39;];
$stmt &＃61; $conn->query($sql);
while ($row &＃61; $stmt->fetch()) {
//printf("%s\r\n", );
$result[] &＃61; $row[&＃39;username&＃39;];
}
return serialize($result);
}

Client

# create our client object
$gmclient&＃61; new GearmanClient();
# add the default server (localhost)
$gmclient->addServer();
# run reverse client in the background
$job_handle &＃61; $gmclient->doNormal("members",serialize(array(&＃39;limit&＃39;&＃61;>5,&＃39;offset&＃39;&＃61;>10)));
if ($gmclient->returnCode() &＃61;&＃61; GEARMAN_SUCCESS)
{
print_r(unserialize($job_handle));
}

运行结果

$ php client.php
Array
(
[0] &＃61;> 257000005
[1] &＃61;> 257000006
[2] &＃61;> 257000009
[3] &＃61;> 257000010
[4] &＃61;> 257000011
[5] &＃61;> 257000012
[6] &＃61;> 257000013
[7] &＃61;> 257000014
[8] &＃61;> 257000015
[9] &＃61;> 257000016
)