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<?php declare(strict_types=1); |
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namespace Igni\Storage; |
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use Igni\Storage\Migration\Version; |
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use Igni\Storage\Migration\VersionSynchronizer; |
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/** |
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* Lightweight migration system usable with multiple databases. |
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* Using migration manager one must implement VersionSynchronizer |
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* which is responsible for providing current system version as well |
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* as storing version used by migration. |
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* |
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* @see \Igni\Storage\Migration\VersionSynchronizer |
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* @package Igni\Storage |
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*/ |
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class MigrationManager |
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{ |
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/** |
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* @var VersionSynchronizer |
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*/ |
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private $synchronizer; |
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/** |
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* @var Migration[] |
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*/ |
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private $migrations = []; |
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public function __construct(VersionSynchronizer $synchronizer) |
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{ |
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$this->synchronizer = $synchronizer; |
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} |
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public function register(Migration $migration): void |
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{ |
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$this->migrations[] = $migration; |
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} |
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public function getCurrentVersion(): Version |
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{ |
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return $this->synchronizer->getVersion(); |
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} |
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public function migrate(Version $targetVersion = null): Version |
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{ |
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$lastVersion = $this->synchronizer->getVersion(); |
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if ($targetVersion === null) { |
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$targetVersion = $this->findNewestVersion(); |
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} |
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if ($targetVersion->greaterThan($lastVersion)) { |
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foreach ($this->migrations as $migration) { |
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if ($migration->getVersion()->lowerOrEquals($targetVersion)) { |
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$migration->up(); |
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} |
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} |
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} else if ($targetVersion->lowerThan($lastVersion)) { |
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foreach ($this->migrations as $migration) { |
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if ($migration->getVersion()->greaterThan($targetVersion)) { |
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$migration->down(); |
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} |
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} |
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} |
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$this->synchronizer->setVersion($targetVersion); |
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return $targetVersion; |
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} |
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private function findNewestVersion(): Version |
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{ |
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$version = Version::fromString('0.0.0'); |
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foreach ($this->migrations as $migration) { |
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if ($migration->getVersion()->greaterThan($version)) { |
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$version = clone $migration->getVersion(); |
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} |
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} |
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return $version; |
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} |
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} |
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igniphp /
storage
