Gearman + PHP 实现分布式对象调用

191145685

Gearman + 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
+86 13113668890
+86 755 29812080
<netkiller@msn.com>









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版权 © 2011, 2012, 2013 http://netkiller.github.io



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





我的系列文档

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Netkiller Linux 手札	Netkiller CentOS 手札	Netkiller FreeBSD 手札	Netkiller Security 手札	Netkiller Version 手札	Netkiller Web 手札
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Netkiller Multimedia 手札	Netkiller Docbook 手札	Netkiller 开源软件 手札

　　目录

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 <<EOF
extension=gearman.so
EOF

　　确认模块是否安装，同时检查gearman扩展的版本。

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

　　测试脚本 server.php


<?php
$worker= 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


<?php
$client= new GearmanClient();
$client->addServer();
print $client->doNormal("reverse", "Hello World!");
?>

　　我用'o' 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，需要将参数序列化后传递
　　返回值也一样，一个字符串可以直接返回，如果返回数字类型是不允许的，需要序列化处理

例 1. 多参数传递与返回值实例
　　Server


<?php
require 'Doctrine/Common/ClassLoader.php';
use Doctrine\Common\ClassLoader;
use Doctrine\DBAL\DriverManager;
use Doctrine\DBAL\Configuration;
$classLoader = new ClassLoader('Doctrine', '/www/DoctrineDBAL-2.3.4/');
$classLoader->register();
$config = new Configuration();
$connectionParams = array(
'dbname' => 'example',
'user' => 'www',
'password' => 'password',
'host' => '192.168.2.1',
'driver' => 'pdo_mysql',
);
$conn = DriverManager::getConnection($connectionParams, $config);
$host = '127.0.0.1';
$port = 4730;
echo "Starting\n";
# Create our worker object.
$gmworker= 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() != GEARMAN_SUCCESS)
{
echo "return_code: " . $gmworker->returnCode() . "\n";
break;
}
}
function members($job)
{
global  $conn;
$param = unserialize($job->workload());
print_r($param);
$sql = "SELECT username FROM members limit ".$param['limit'].",".$param['offset'];
$stmt = $conn->query($sql);
while ($row = $stmt->fetch()) {
//printf("%s\r\n", );
$result[] = $row['username'];
}
return serialize($result);
}

　　Client


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

　　运行结果

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