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<?php |
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namespace SilverStripe\ORM\Connect; |
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/** |
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* TransactionManager decorator that adds virtual nesting support. |
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* Because this is managed in PHP and not the database, it has the following limitations: |
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* - Committing a nested transaction won't change anything until the parent transaction is committed |
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* - Rolling back a nested transaction means that the parent transaction must be rolled backed |
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* |
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* DBAL describes this behaviour nicely in their docs: https://www.doctrine-project.org/projects/doctrine-dbal/en/2.8/reference/transactions.html#transaction-nesting |
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*/ |
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class NestedTransactionManager implements TransactionManager |
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{ |
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/** |
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* @var int |
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*/ |
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protected $transactionNesting = 0; |
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/** |
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* @var TransactionManager |
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*/ |
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protected $child; |
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/** |
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* Set to true if all transactions must roll back to the parent |
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* @var boolean |
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*/ |
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protected $mustRollback = false; |
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/** |
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* Create a NestedTransactionManager |
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* @param TransactionManager $child The transaction manager that will handle the topmost transaction |
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*/ |
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public function __construct(TransactionManager $child) |
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{ |
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$this->child = $child; |
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} |
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/** |
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* Start a transaction |
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* @throws DatabaseException on failure |
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* @return bool True on success |
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*/ |
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public function transactionStart($transactionMode = false, $sessionCharacteristics = false) |
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{ |
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if ($this->transactionNesting <= 0) { |
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$this->transactionNesting = 1; |
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$this->child->transactionStart($transactionMode, $sessionCharacteristics); |
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} else { |
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if ($this->child->supportsSavepoints()) { |
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$this->child->transactionSavepoint("nesting" . $this->transactionNesting); |
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} |
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$this->transactionNesting++; |
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} |
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} |
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public function transactionEnd($chain = false) |
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{ |
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if ($this->mustRollback) { |
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throw new DatabaseException("Child transaction was rolled back, so parent can't be committed"); |
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} |
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if ($this->transactionNesting < 1) { |
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throw new DatabaseException("Not within a transaction, so can't commit"); |
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} |
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$this->transactionNesting--; |
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if ($this->transactionNesting === 0) { |
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$this->child->transactionEnd(); |
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} |
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if ($chain) { |
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return $this->transactionStart(); |
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} |
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} |
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public function transactionRollback($savepoint = null) |
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{ |
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if ($this->transactionNesting < 1) { |
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throw new DatabaseException("Not within a transaction, so can't roll back"); |
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} |
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if ($savepoint) { |
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return $this->child->transactionRollback($savepoint); |
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} |
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$this->transactionNesting--; |
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if ($this->transactionNesting === 0) { |
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$this->child->transactionRollback(); |
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$this->mustRollback = false; |
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} else { |
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if ($this->child->supportsSavepoints()) { |
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$this->child->transactionRollback("nesting" . $this->transactionNesting); |
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$this->mustRollback = false; |
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// Without savepoints, parent transactions must roll back if a child one has |
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} else { |
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$this->mustRollback = true; |
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} |
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} |
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} |
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/** |
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* Return the depth of the transaction. |
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* |
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* @return int |
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*/ |
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public function transactionDepth() |
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{ |
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return $this->transactionNesting; |
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} |
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public function transactionSavepoint($savepoint) |
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{ |
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return $this->child->transactionSavepoint($savepoint); |
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} |
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public function supportsSavepoints() |
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{ |
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return $this->child->supportsSavepoints(); |
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} |
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} |
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silverstripe /
silverstripe-framework
