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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\Connection\Aggregate;
use Predis\Cluster\PredisStrategy;
use Predis\Cluster\StrategyInterface;
use Predis\Command\CommandInterface;
use Predis\Connection\NodeConnectionInterface;
use Predis\NotSupportedException;
/**
* Abstraction for a cluster of aggregate connections to various Redis servers
* implementing client-side sharding based on pluggable distribution strategies.
*
* @author Daniele Alessandri <suppakilla@gmail.com>
*
* @todo Add the ability to remove connections from pool.
*/
class PredisCluster implements ClusterInterface, \IteratorAggregate, \Countable
{
private $pool;
private $strategy;
private $distributor;
/**
* @param StrategyInterface $strategy Optional cluster strategy.
*/
public function __construct(StrategyInterface $strategy = null)
{
$this->pool = array();
$this->strategy = $strategy ?: new PredisStrategy();
$this->distributor = $this->strategy->getDistributor();
}
/**
* {@inheritdoc}
*/
public function isConnected()
{
foreach ($this->pool as $connection) {
if ($connection->isConnected()) {
return true;
}
}
return false;
}
/**
* {@inheritdoc}
*/
public function connect()
{
foreach ($this->pool as $connection) {
$connection->connect();
}
}
/**
* {@inheritdoc}
*/
public function disconnect()
{
foreach ($this->pool as $connection) {
$connection->disconnect();
}
}
/**
* {@inheritdoc}
*/
public function add(NodeConnectionInterface $connection)
{
$parameters = $connection->getParameters();
if (isset($parameters->alias)) {
$this->pool[$parameters->alias] = $connection;
} else {
$this->pool[] = $connection;
}
$weight = isset($parameters->weight) ? $parameters->weight : null;
$this->distributor->add($connection, $weight);
}
/**
* {@inheritdoc}
*/
public function remove(NodeConnectionInterface $connection)
{
if (($id = array_search($connection, $this->pool, true)) !== false) {
unset($this->pool[$id]);
$this->distributor->remove($connection);
return true;
}
return false;
}
/**
* Removes a connection instance using its alias or index.
*
* @param string $connectionID Alias or index of a connection.
*
* @return bool Returns true if the connection was in the pool.
*/
public function removeById($connectionID)
{
if ($connection = $this->getConnectionById($connectionID)) {
return $this->remove($connection);
}
return false;
}
/**
* {@inheritdoc}
*/
public function getConnection(CommandInterface $command)
{
$slot = $this->strategy->getSlot($command);
if (!isset($slot)) {
throw new NotSupportedException(
"Cannot use '{$command->getId()}' over clusters of connections."
);
}
$node = $this->distributor->getBySlot($slot);
return $node;
}
/**
* {@inheritdoc}
*/
public function getConnectionById($connectionID)
{
return isset($this->pool[$connectionID]) ? $this->pool[$connectionID] : null;
}
/**
* Retrieves a connection instance from the cluster using a key.
*
* @param string $key Key string.
*
* @return NodeConnectionInterface
*/
public function getConnectionByKey($key)
{
$hash = $this->strategy->getSlotByKey($key);
$node = $this->distributor->getBySlot($hash);
return $node;
}
/**
* Returns the underlying command hash strategy used to hash commands by
* using keys found in their arguments.
*
* @return StrategyInterface
*/
public function getClusterStrategy()
{
return $this->strategy;
}
/**
* @return int
*/
public function count()
{
return count($this->pool);
}
/**
* @return \Traversable<string|int, NodeConnectionInterface>
*/
public function getIterator()
{
return new \ArrayIterator($this->pool);
}
/**
* {@inheritdoc}
*/
public function writeRequest(CommandInterface $command)
{
$this->getConnection($command)->writeRequest($command);
}
/**
* {@inheritdoc}
*/
public function readResponse(CommandInterface $command)
{
return $this->getConnection($command)->readResponse($command);
}
/**
* {@inheritdoc}
*/
public function executeCommand(CommandInterface $command)
{
return $this->getConnection($command)->executeCommand($command);
}
/**
* Executes the specified Redis command on all the nodes of a cluster.
*
* @param CommandInterface $command A Redis command.
*
* @return array
*/
public function executeCommandOnNodes(CommandInterface $command)
{
$responses = array();
foreach ($this->pool as $connection) {
$responses[] = $connection->executeCommand($command);
}
return $responses;
}
}