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<header>Updated: 2017-04-13 18:52:38 CST +08</header>
<main>
<h1 id="queue">Queue</h1>
<pre><code class="language-sequence">Consumer->Queue Server: Add Job
Worker->Queue Server: Listen
Worker->Queue Server: Get Job
Worker->Worker: Do Something
Worker-->Consumer: Notice
</code></pre>
<h2 id="scenario">Scenario</h2>
<h3 id="real-world">Real World</h3>
<p>百貨公司地下街點餐。</p>
<pre><code class="language-sequence">顧客(Client)->櫃臺(Web Application Server): 點餐
櫃臺(Web Application Server)->佇列(Queue Server): 紀錄
廚師(Worker)->佇列(Queue Server):拿單
廚師(Worker)->廚師(Worker):煮菜
廚師(Worker)->顧客(Client):通知
</code></pre>
<p>直接接觸顧客的櫃臺或服務生就如 Web Server，在廚房專心做菜的廚師就像 Worker。
而顧客如何知道何時取餐？靠看板上的號碼或是通知器。</p>
<h3 id="computer-world">Computer World</h3>
<ol>
<li>使用者上傳圖片</li>
<li>將圖片縮圖、優化</li>
<li>上傳至 File Server</li>
</ol>
<p>若一般的作法會在網站伺服器做處理，若使用者過多很容易造成伺服器爆炸，連網站都掛點。</p>
<p>使用Job Queue的話，假設你現在有三台機器，一台當 Web Server，兩台當 Worker Server。</p>
<pre><code class="language-sequence">Client->Web Server: Upload Picture
Web Server->File Server: Upload Picture
Web Server->Queue: Add Picture Process Job
WorkerA.B->Queue: Listen
WorkerA.B->Queue: Get Job
WorkerA.B->File Server: Download Picture
WorkerA.B->WorkerA.B: Process Picture
WorkerA.B->File Server: Upload Thumbnail and Optimized Picture
</code></pre>
<p>WorkerA 與 WorkerB 分別聽取 Queue Server 等待工作，誰有空誰就拿取工作做。</p>
<h3 id="details">Details</h3>
<h3 id="what-is-queue">What is Queue</h3>
<ul>
<li>Data Structure: FIFO (First In First Out)</li>
<li>Line Up (排隊)</li>
</ul>
<h3 id="why">Why</h3>
<ul>
<li>一次做好一件事</li>
</ul>
<h3 id="when">When</h3>
<ul>
<li>事情需要專心處理時，事情需要消耗大量資源時。</li>
</ul>
<h3 id="where">Where</h3>
<ul>
<li>Beanstalk</li>
<li>Redis</li>
<li>Iron.io</li>
</ul>
<h3 id="simple-queue-example-in-php">Simple Queue Example In PHP</h3>
<pre><code class="language-php">class Queue
{
$queue = [];
public function enqueue()
{
return $this->queue
}
public function dequeue()
{
}
}
</code></pre>
<h3 id="laravel-example">Laravel Example</h3>
<p><a href="https://github.com/dinos80152/laravel5-example/tree/master/app/Jobs">Laravel 5 Example by Dino Lai @github</a></p>
<h2 id="beanstalk">Beanstalk</h2>
<p><a href="http://kr.github.io/beanstalkd/">official web site</a></p>
<h3 id="beanstalk-client-reference">Beanstalk Client Reference</h3>
<ul>
<li><a href="https://github.com/pda/pheanstalk">PHP Client</a></li>
<li><a href="http://laravel.com/docs/5.1/queues">Laravel Documentation</a></li>
</ul>
<h3 id="tools">Tools</h3>
<ul>
<li><a href="https://github.com/ptrofimov/beanstalk_console">Beanstalk Console</a></li>
</ul>
<h3 id="reference">Reference</h3>
<ul>
<li><a href="http://www.haodaima.net/art/2428782">http://www.haodaima.net/art/2428782</a></li>
<li><a href="http://alister.github.io/presentations/Beanstalkd/">BeanstalkD: An Introduction to queuing by Alister Bulman</a></li>
</ul>
<h2 id="extended-reading">Extended Reading</h2>
<ul>
<li><a href="https://www.rabbitmq.com/getstarted.html">RabbitMQ Tutorial (Know How Queue Work)</a></li>
</ul>
<gcse:searchresults-only></gcse:searchresults-only>
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