ScriptCommand.php
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<?php
/*
* This file is part of the Predis package.
*
* (c) Daniele Alessandri <suppakilla@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Predis\Command;
/**
* Base class used to implement an higher level abstraction for commands based
* on Lua scripting with EVAL and EVALSHA.
*
* @link http://redis.io/commands/eval
*
* @author Daniele Alessandri <suppakilla@gmail.com>
*/
abstract class ScriptCommand extends ServerEvalSHA
{
/**
* Gets the body of a Lua script.
*
* @return string
*/
abstract public function getScript();
/**
* Specifies the number of arguments that should be considered as keys.
*
* The default behaviour for the base class is to return 0 to indicate that
* all the elements of the arguments array should be considered as keys, but
* subclasses can enforce a static number of keys.
*
* @return int
*/
protected function getKeysCount()
{
return 0;
}
/**
* Returns the elements from the arguments that are identified as keys.
*
* @return array
*/
public function getKeys()
{
return array_slice($this->getArguments(), 2, $this->getKeysCount());
}
/**
* {@inheritdoc}
*/
protected function filterArguments(array $arguments)
{
if (($numkeys = $this->getKeysCount()) && $numkeys < 0) {
$numkeys = count($arguments) + $numkeys;
}
return array_merge(array(sha1($this->getScript()), (int) $numkeys), $arguments);
}
/**
* @return array
*/
public function getEvalArguments()
{
$arguments = $this->getArguments();
$arguments[0] = $this->getScript();
return $arguments;
}
}