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<title>MemcacheQ - Simple Queue Service over Memcache</title>
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<body>
<div class="document" id="memcacheq-simple-queue-service-over-memcache">
<h1 class="title">MemcacheQ - Simple Queue Service over Memcache</h1>
<div class="section" id="features">
<h1>Features</h1>
<ul class="simple">
<li>High performance</li>
<li>Strictly FIFO</li>
<li>Multiple queue supported</li>
<li>Memcache protocol compatible</li>
<li>Simple and easy to use</li>
</ul>
</div>
<div class="section" id="benchmark">
<h1>Benchmark</h1>
</div>
<div class="section" id="getting-started">
<h1>Getting Started</h1>
<div class="section" id="download">
<h2>Download</h2>
<p>See <<a class="reference external" href="http://code.google.com/p/memcacheq/downloads/list">http://code.google.com/p/memcacheq/downloads/list</a>></p>
</div>
<div class="section" id="installation">
<h2>Installation</h2>
<p>See <<a class="reference external" href="http://memcachedb.org/memcacheq/INSTALL.html">http://memcachedb.org/memcacheq/INSTALL.html</a>></p>
</div>
<div class="section" id="commands">
<h2>Commands</h2>
<p>Only two commands are used to operate the queue:</p>
<p><strong>Append a message to the tail of queue</strong>:</p>
<pre class="literal-block">
set <queue name> 0 0 <message_len>\r\n
<put your message body here>\r\n
STORED\r\n
</pre>
<p><strong>Note:</strong> MQ will create a new queue automatically if your queue is not existed. The original 'flags' and 'expire time' field is ignored by server(here just padded with 0).</p>
<p><strong>Pop a message from the head of queue</strong>:</p>
<pre class="literal-block">
get <queue name>\r\n
VALUE <queue name> 0 <message_len>\r\n
<your message body will come here>\r\n
END\r\n
</pre>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<p>Assuming you are using PHP memcache<<a class="reference external" href="http://www.php.net/memcache">http://www.php.net/memcache</a>>:</p>
<pre class="literal-block">
<?php
/* connect to memcached server */
$memcache_obj = memcache_connect('memcacheq_host', 21201);
/* append a message to queue */
memcache_set($memcache_obj, 'demoqueue1', 'message body here', 0, 0);
/* pop a message from 'demoqueue1' */
memcache_get($memcache_obj, 'demoqueue1');
memcache_close($memcache_obj);
?>
</pre>
</div>
</div>
<div class="section" id="limitation">
<h1>Limitation</h1>
<p>The message body is stored in Berkeley DB with fixed length. Any message that is shorter than the declared length will automatically be padded with space character (0x20 in the ASCII character set).</p>
<p>In Berkeley DB, as the official document refers,</p>
<p>"For the Queue access method, the record length must be enough smaller than the database's page size that at least one record plus the database page's metadata information can fit on each database page."</p>
<p>"The minimum page size is 512 bytes, the maximum page size is 64K bytes, and the page size must be a power-of-two."</p>
<p>So we have a limit on the message body size with a max of a bit less than <em>64K</em>.</p>
</div>
</div>
</body>
</html>