# Gearman Job Worker for PHP

最近同事接觸到需要 worker 來處理一些非同步的事情。諸如訂單、寄發 email 都常用非同步來執行，以往這些事情大多都用排程解決，其實還有更好的 solution。他們使用 [Gearman](http://gearman.org/) 來解決這個問題。好奇心的驅使，就算不是我實作的我也想去玩玩看新的東西，Gearman 可以在系統裡起一個 `Job Worker` 也可以算是 service，這個 job worker 可以在不起一個排程的情況底下，幫你寄信、處理訂單。也就是當你有需要使用 email 在呼叫他就好了。

## 安裝 Gearman

在 CentOS 中可以直接用 `yum` 安裝

```bash
yum install -y gearmand
```

## 安裝 Gearman 依賴包

```bash
yum -y install re2c geoip geoip-data geoip-devel gcc* boost* libgearman*
```

這兩個步驟都很簡單

## 安裝 PHP 的 Gearman extension

```bash
wget http://pecl.php.net/get/gearman-1.1.1.tgz
cd gearman-1.1.1
phpize
./configure
```

![](https://482391049-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M4iaeavZQiIsfq7eCxo%2Fuploads%2Fgit-blob-04a4e9516e28beb681262e4ae641937a8be25551%2Fgearman-1.PNG?alt=media)

```bash
make && make install
```

![](https://482391049-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M4iaeavZQiIsfq7eCxo%2Fuploads%2Fgit-blob-e1c66c67b5dad066c1ee767b09a7138be8ca5ff5%2Fgearman-2.PNG?alt=media)

![](https://482391049-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M4iaeavZQiIsfq7eCxo%2Fuploads%2Fgit-blob-9c86993c64149d8aad05e37231979e72f3753f36%2Fgearman-3.PNG?alt=media)

最後在 `php.ini` 加上 module

```bash
vim /etc/php.ini
```

```ini
extension="gearman.so"
```

儲存後重新啟動

```bash
service httpd restart
```

這樣 php 就支援 gearman 囉

![](https://482391049-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M4iaeavZQiIsfq7eCxo%2Fuploads%2Fgit-blob-8583175552b15c4fdb9eddf2790d4931920f91d3%2Fgearman-4.PNG?alt=media)

## Hello World

不免俗的一定要測試一下的，這邊我就利用官網提供的程式碼做測試。

首先建立一隻 worker.php

```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());
  }
?>
```

再建立一隻 client.php

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

然後執行 worker

```bash
php worker.php
```

再執行 client 就可以得到 Hello World 了

```bash
php client.php
```

若要停止這個 job worker 可以用 `Ctrl + C`

這東西還蠻強大的，之前試用過 [Beanstalk](http://beanstalkapp.com/) 覺得 Gearman 相對強大許多。

> Dec 22nd, 2013 4:40:00pm


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