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<?php |
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/** |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2015 Repo2 |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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namespace Repo2\QueryReactor\Sharding; |
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use Repo2\QueryReactor\Controller; |
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use Repo2\QueryReactor\Driver; |
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use Repo2\QueryReactor\Query; |
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class ShardingController implements Controller |
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{ |
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/** @var ShardingService */ |
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private $sharding; |
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/** @var string */ |
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private $controllerClass; |
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/** @var Controller[] */ |
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private $controllers = []; |
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/** |
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* @param ShardingService $sharding |
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* @param string $controllerClass |
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*/ |
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public function __construct(ShardingService $sharding, $controllerClass) |
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{ |
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$this->sharding = $sharding; |
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$this->controllerClass = $controllerClass; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getQuery(Driver $driver, $link) |
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{ |
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foreach ($this->controllers as $controller) { |
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try { |
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return $controller->getQuery($driver, $link); |
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} catch (\OutOfBoundsException $err) { |
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continue; |
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} |
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} |
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throw new \OutOfBoundsException(sprintf('Undefined %s in the sharding controller.', $driver->info($link))); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function getLink(Driver $driver, Query $query) |
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{ |
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if ($query instanceof ShardedQuery) { |
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$controller = $this->pickShard($query); |
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} else { |
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$controller = $this->pickGlobal(); |
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} |
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return $controller->getLink($driver, $query); |
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} |
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/** |
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* @return Controller |
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*/ |
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private function pickGlobal() |
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{ |
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if (empty($this->controllers[0])) { |
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$this->controllers[0] = new $this->controllerClass($this->sharding->selectGlobal()); |
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} |
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return $this->controllers[0]; |
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} |
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/** |
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* @param ShardedQuery $query |
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* @return Controller |
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*/ |
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private function pickShard(ShardedQuery $query) |
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{ |
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$params = $this->sharding->selectShard($query->getDistributionName(), $query->getDistributionValue()); |
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if (empty($params['id'])) { |
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throw new \RuntimeException('Required not empty key "id" in sharding configuration.'); |
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} |
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$shardId = $params['id']; |
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if (empty($this->controllers[$shardId])) { |
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$this->controllers[$shardId] = new $this->controllerClass($params); |
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} |
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return $this->controllers[$shardId]; |
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} |
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} |
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Repo2 /
query-reactor
