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67 lines
2.9 KiB
Markdown
67 lines
2.9 KiB
Markdown
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# Redisent
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Redisent is a simple, no-nonsense interface to the [Redis](http://code.google.com/p/redis/) key-value store for modest developers.
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Due to the way it is implemented, it is flexible and tolerant of changes to the Redis protocol.
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## Getting to work
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If you're at all familiar with the Redis protocol and PHP objects, you've already mastered Redisent.
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All Redisent does is map the Redis protocol to a PHP object, abstract away the nitty-gritty, and make the return values PHP compatible.
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require 'redisent.php';
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$redis = new Redisent('localhost');
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$redis->set('awesome', 'absolutely');
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echo sprintf('Is Redisent awesome? %s.\n', $redis->get('awesome'));
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You use the exact same command names, and the exact same argument order. **How wonderful.** How about a more complex example?
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require 'redisent.php';
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$redis = new Redisent('localhost');
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$redis->rpush('particles', 'proton');
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$redis->rpush('particles', 'electron');
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$redis->rpush('particles', 'neutron');
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$particles = $redis->lrange('particles', 0, -1);
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$particle_count = $redis->llen('particles');
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echo "<p>The {$particle_count} particles that make up atoms are:</p>";
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echo "<ul>";
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foreach ($particles as $particle) {
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echo "<li>{$particle}</li>";
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}
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echo "</ul>";
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Be aware that Redis error responses will be wrapped in a RedisException class and thrown, so do be sure to use proper coding techniques.
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## Clustering your servers
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Redisent also includes a way for developers to fully utilize the scalability of Redis with multiple servers and [consistent hashing](http://en.wikipedia.org/wiki/Consistent_hashing).
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Using the RedisentCluster class, you can use Redisent the same way, except that keys will be hashed across multiple servers.
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Here is how to set up a cluster:
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include 'redisent_cluster.php';
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$cluster = new RedisentCluster(array(
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array('host' => '127.0.0.1', 'port' => 6379),
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array('host' => '127.0.0.1', 'port' => 6380)
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));
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You can then use Redisent the way you normally would, i.e., `$cluster->set('key', 'value')` or `$cluster->lrange('particles', 0, -1)`.
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But what about when you need to use commands that are server specific and do not operate on keys? You can use routing, with the `RedisentCluster::to` method.
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To use routing, you need to assign a server an alias in the constructor of the Redis cluster. Aliases are not required on all servers, just the ones you want to be able to access directly.
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include 'redisent_cluster.php';
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$cluster = new RedisentCluster(array(
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'alpha' => array('host' => '127.0.0.1', 'port' => 6379),
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array('host' => '127.0.0.1', 'port' => 6380)
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));
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Now there is an alias of the server running on 127.0.0.1:6379 called **alpha**, and can be interacted with like this:
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// get server info
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$cluster->to('alpha')->info();
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Now you have complete programatic control over your Redis servers.
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## About
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© 2009 [Justin Poliey](http://justinpoliey.com)
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