AphrontDatabaseTransactionState.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* Represents current transaction state of a connection.
	*
	* @group storage
	*/
	final class AphrontDatabaseTransactionState {

	private $depth;

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

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

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

	return --$this->depth;
	}

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

	public function __destruct() {
	if ($this->depth) {
	throw new Exception(
	'Process exited with an open transaction! The transaction will be '.
	'implicitly rolled back. Calls to openTransaction() must always be '.
	'paired with a call to saveTransaction() or killTransaction().');
	}
	}

	}