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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2023 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 ArrayAccess;
use ArrayIterator;
use Countable;
use IteratorAggregate;
use OutOfBoundsException;
use Predis\Connection\NodeConnectionInterface;
use ReturnTypeWillChange;
use Traversable;
/**
* Slot map for redis-cluster.
*/
class SlotMap implements ArrayAccess, IteratorAggregate, Countable
{
private $slots = [];
/**
* Checks if the given slot is valid.
*
* @param int $slot Slot index.
*
* @return bool
*/
public static function isValid($slot)
{
return $slot >= 0x0000 && $slot <= 0x3FFF;
}
/**
* Checks if the given slot range is valid.
*
* @param int $first Initial slot of the range.
* @param int $last Last slot of the range.
*
* @return bool
*/
public static function isValidRange($first, $last)
{
return $first >= 0x0000 && $first <= 0x3FFF && $last >= 0x0000 && $last <= 0x3FFF && $first <= $last;
}
/**
* Resets the slot map.
*/
public function reset()
{
$this->slots = [];
}
/**
* Checks if the slot map is empty.
*
* @return bool
*/
public function isEmpty()
{
return empty($this->slots);
}
/**
* Returns the current slot map as a dictionary of $slot => $node.
*
* The order of the slots in the dictionary is not guaranteed.
*
* @return array
*/
public function toArray()
{
return $this->slots;
}
/**
* Returns the list of unique nodes in the slot map.
*
* @return array
*/
public function getNodes()
{
return array_keys(array_flip($this->slots));
}
/**
* Assigns the specified slot range to a node.
*
* @param int $first Initial slot of the range.
* @param int $last Last slot of the range.
* @param NodeConnectionInterface|string $connection ID or connection instance.
*
* @throws OutOfBoundsException
*/
public function setSlots($first, $last, $connection)
{
if (!static::isValidRange($first, $last)) {
throw new OutOfBoundsException("Invalid slot range $first-$last for `$connection`");
}
$this->slots += array_fill($first, $last - $first + 1, (string) $connection);
}
/**
* Returns the specified slot range.
*
* @param int $first Initial slot of the range.
* @param int $last Last slot of the range.
*
* @return array
*/
public function getSlots($first, $last)
{
if (!static::isValidRange($first, $last)) {
throw new OutOfBoundsException("Invalid slot range $first-$last");
}
return array_intersect_key($this->slots, array_fill($first, $last - $first + 1, null));
}
/**
* Checks if the specified slot is assigned.
*
* @param int $slot Slot index.
*
* @return bool
*/
#[ReturnTypeWillChange]
public function offsetExists($slot)
{
return isset($this->slots[$slot]);
}
/**
* Returns the node assigned to the specified slot.
*
* @param int $slot Slot index.
*
* @return string|null
*/
#[ReturnTypeWillChange]
public function offsetGet($slot)
{
return $this->slots[$slot] ?? null;
}
/**
* Assigns the specified slot to a node.
*
* @param int $slot Slot index.
* @param NodeConnectionInterface|string $connection ID or connection instance.
*
* @return void
*/
#[ReturnTypeWillChange]
public function offsetSet($slot, $connection)
{
if (!static::isValid($slot)) {
throw new OutOfBoundsException("Invalid slot $slot for `$connection`");
}
$this->slots[(int) $slot] = (string) $connection;
}
/**
* Returns the node assigned to the specified slot.
*
* @param int $slot Slot index.
*
* @return void
*/
#[ReturnTypeWillChange]
public function offsetUnset($slot)
{
unset($this->slots[$slot]);
}
/**
* Returns the current number of assigned slots.
*
* @return int
*/
#[ReturnTypeWillChange]
public function count()
{
return count($this->slots);
}
/**
* Returns an iterator over the slot map.
*
* @return Traversable<int, string>
*/
#[ReturnTypeWillChange]
public function getIterator()
{
return new ArrayIterator($this->slots);
}
}