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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2025 Till Krüss
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Predis\Cluster;
use Countable;
use OutOfBoundsException;
/**
* Represents a range of slots in a Redis cluster.
*/
class SlotRange implements Countable
{
/**
* Maximum number of slots in a Redis cluster is 16384.
*/
public const MAX_SLOTS = 0x3FFF;
/**
* Starting slot of the range.
*
* @var int
*/
protected $start;
/**
* Ending slot of the range.
*
* @var int
*/
protected $end;
/**
* Connection to the server hosting this slot range.
*
* @var string
*/
protected $connection;
public function __construct(int $start, int $end, string $connection)
{
if (!static::isValidRange($start, $end)) {
throw new OutOfBoundsException("Invalid slot range $start-$end for `$connection`");
}
$this->start = $start;
$this->end = $end;
$this->connection = $connection;
}
/**
* Checks if a slot range is valid.
*
* @param int $first
* @param int $last
*
* @return bool
*/
public static function isValidRange($first, $last)
{
return $first >= 0 && $first <= self::MAX_SLOTS && $last >= 0x0000 && $last <= self::MAX_SLOTS && $first <= $last;
}
/**
* Returns the start slot index of this range.
*
* @return int
*/
public function getStart()
{
return $this->start;
}
/**
* Returns the end slot index of this range.
*
* @return int
*/
public function getEnd()
{
return $this->end;
}
/**
* Returns the connection to the server hosting this slot range.
*
* @return string
*/
public function getConnection()
{
return $this->connection;
}
/**
* Checks if the specific slot is contained in this range.
*
* @param int $slot
*
* @return bool
*/
public function hasSlot(int $slot)
{
return $this->start <= $slot && $this->end >= $slot;
}
/**
* Returns an array of connection strings for each slot in this range.
*
* @return string[]
*/
public function toArray(): array
{
return array_fill($this->start, $this->end - $this->start + 1, $this->connection);
}
/**
* Returns the number of slots in this range.
*
* @return int
*/
public function count(): int
{
return $this->end - $this->start + 1;
}
/**
* Checks if this range has an intersection with the given slot range.
*
* @param SlotRange $slotRange
*
* @return bool
*/
public function hasIntersectionWith(SlotRange $slotRange): bool
{
return $this->start <= $slotRange->getEnd() && $this->end >= $slotRange->getStart();
}
}