AphrontDatabaseTransactionState.php
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AphrontDatabaseTransactionState.php
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	<?php

	/**
	* Represents current transaction state of a connection.
	*/
	final class AphrontDatabaseTransactionState extends Phobject {

	private $depth = 0;
	private $readLockLevel = 0;
	private $writeLockLevel = 0;

	public function getDepth() {
	return $this->depth;
	}

	public function increaseDepth() {
	return ++$this->depth;
	}

	public function decreaseDepth() {
	if ($this->depth == 0) {
	throw new Exception(
	pht(
	'Too many calls to %s or %s!',
	'saveTransaction()',
	'killTransaction()'));
	}

	return --$this->depth;
	}

	public function getSavepointName() {
	return 'Aphront_Savepoint_'.$this->depth;
	}

	public function beginReadLocking() {
	$this->readLockLevel++;
	return $this;
	}

	public function endReadLocking() {
	if ($this->readLockLevel == 0) {
	throw new Exception(
	pht(
	'Too many calls to %s!',
	__FUNCTION__.'()'));
	}
	$this->readLockLevel--;
	return $this;
	}

	public function isReadLocking() {
	return ($this->readLockLevel > 0);
	}

	public function beginWriteLocking() {
	$this->writeLockLevel++;
	return $this;
	}

	public function endWriteLocking() {
	if ($this->writeLockLevel == 0) {
	throw new Exception(
	pht(
	'Too many calls to %s!',
	__FUNCTION__.'()'));
	}
	$this->writeLockLevel--;
	return $this;
	}

	public function isWriteLocking() {
	return ($this->writeLockLevel > 0);
	}

	public function __destruct() {
	if ($this->depth) {
	throw new Exception(
	pht(
	'Process exited with an open transaction! The transaction '.
	'will be implicitly rolled back. Calls to %s must always be '.
	'paired with a call to %s or %s.',
	'openTransaction()',
	'saveTransaction()',
	'killTransaction()'));
	}
	if ($this->readLockLevel) {
	throw new Exception(
	pht(
	'Process exited with an open read lock! Call to %s '.
	'must always be paired with a call to %s.',
	'beginReadLocking()',
	'endReadLocking()'));
	}
	if ($this->writeLockLevel) {
	throw new Exception(
	pht(
	'Process exited with an open write lock! Call to %s '.
	'must always be paired with a call to %s.',
	'beginWriteLocking()',
	'endWriteLocking()'));
	}
	}

	}

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