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<?php |
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namespace itertools; |
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use Exception; |
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use IteratorIterator; |
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use itertools\IterUtil; |
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use PDO; |
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/** |
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* When adding this itertator to a for loop you can automatically |
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* batch updates in a transaction to speed up inserts or updates. |
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* |
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* Example: |
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* foreach (new TimedAutoTransactionBatchIterator($entities, $pdo) as $entity) { |
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* $this->pdo->exec('UPDATE entity SET counter = counter + 1 WHERE id = ' . (int) $entity->getId()); |
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* // Batching updates in a transaction can be have a huge performance improvement |
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* // By default the commit happens every second. Be aware, long transactions can cause dead locks |
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* } |
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*/ |
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class TimedAutoTransactionBatchIterator extends IteratorIterator |
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{ |
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const START_TRANSACTION = -1; |
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protected $timeout; |
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protected $pdo; |
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protected $nextCommitTime = self::START_TRANSACTION; |
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protected $inTransaction = false; |
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public function __construct($iterator, PDO $pdo, $timeout = 1.0 /** s */) |
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{ |
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parent::__construct(IterUtil::asTraversable($iterator)); |
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$this->timeout = $timeout; |
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$this->pdo = $pdo; |
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} |
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public function valid() |
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{ |
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$valid = parent::valid(); |
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if (! $valid) { |
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$this->commitIfInTransaction(); |
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return false; |
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} |
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if (microtime(true) >= $this->nextCommitTime) { |
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$this->nextCommitTime = self::START_TRANSACTION; |
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$this->commitIfInTransaction(); |
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} |
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if (self::START_TRANSACTION == $this->nextCommitTime) { |
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$this->pdo->beginTransaction(); |
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$this->inTransaction = true; |
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$this->nextCommitTime = microtime(true) + $this->timeout; |
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} |
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return true; |
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} |
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public function commitIfInTransaction() |
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{ |
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if(! $this->inTransaction) { |
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return; |
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} |
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try { |
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$this->pdo->commit(); |
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$this->inTransaction = false; |
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} catch(Exception $e) { |
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$this->pdo->rollBack(); |
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$this->inTransaction = false; |
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throw $e; |
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} |
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} |
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public function __destruct() |
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{ |
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if (! $this->inTransaction) { |
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return; |
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} |
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// this can only be destructed in transaction if exception occured |
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$this->pdo->rollBack(); |
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} |
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} |
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