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<?php
/*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the MIT license. For more information, see
* <http://www.doctrine-project.org>.
*/
namespace Doctrine\ORM\Id;
use Doctrine\ORM\EntityManager;
/**
* Id generator that uses a single-row database table and a hi/lo algorithm.
*
* @since 2.0
* @author Benjamin Eberlei <kontakt@beberlei.de>
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Jonathan Wage <jonwage@gmail.com>
* @author Roman Borschel <roman@code-factory.org>
*/
class TableGenerator extends AbstractIdGenerator
{
/**
* @var string
*/
private $_tableName;
/**
* @var string
*/
private $_sequenceName;
/**
* @var int
*/
private $_allocationSize;
/**
* @var int|null
*/
private $_nextValue;
/**
* @var int|null
*/
private $_maxValue;
/**
* @param string $tableName
* @param string $sequenceName
* @param int $allocationSize
*/
public function __construct($tableName, $sequenceName = 'default', $allocationSize = 10)
{
$this->_tableName = $tableName;
$this->_sequenceName = $sequenceName;
$this->_allocationSize = $allocationSize;
}
/**
* {@inheritDoc}
*/
public function generate(
EntityManager $em, $entity)
{
if ($this->_maxValue === null || $this->_nextValue == $this->_maxValue) {
// Allocate new values
$conn = $em->getConnection();
if ($conn->getTransactionNestingLevel() === 0) {
// use select for update
$sql = $conn->getDatabasePlatform()->getTableHiLoCurrentValSql($this->_tableName, $this->_sequenceName);
$currentLevel = $conn->fetchColumn($sql);
if ($currentLevel != null) {
$this->_nextValue = $currentLevel;
$this->_maxValue = $this->_nextValue + $this->_allocationSize;
$updateSql = $conn->getDatabasePlatform()->getTableHiLoUpdateNextValSql(
$this->_tableName, $this->_sequenceName, $this->_allocationSize
);
if ($conn->executeUpdate($updateSql, [1 => $currentLevel, 2 => $currentLevel+1]) !== 1) {
// no affected rows, concurrency issue, throw exception
}
} else {
// no current level returned, TableGenerator seems to be broken, throw exception
}
} else {
// only table locks help here, implement this or throw exception?
// or do we want to work with table locks exclusively?
}
}
return $this->_nextValue++;
}
}
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