107 lines
3.3 KiB
PHP
107 lines
3.3 KiB
PHP
<?php
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/*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information, see
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* <http://www.doctrine-project.org>.
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*/
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namespace Doctrine\ORM\Id;
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use Serializable, Doctrine\ORM\EntityManager;
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/**
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* Represents an ID generator that uses a database sequence.
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*
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* @since 2.0
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* @author Roman Borschel <roman@code-factory.org>
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*/
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class SequenceGenerator extends AbstractIdGenerator implements Serializable
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{
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private $_allocationSize;
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private $_sequenceName;
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private $_nextValue = 0;
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private $_maxValue = null;
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/**
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* Initializes a new sequence generator.
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*
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* @param Doctrine\ORM\EntityManager $em The EntityManager to use.
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* @param string $sequenceName The name of the sequence.
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* @param integer $allocationSize The allocation size of the sequence.
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*/
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public function __construct($sequenceName, $allocationSize)
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{
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$this->_sequenceName = $sequenceName;
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$this->_allocationSize = $allocationSize;
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}
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/**
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* Generates an ID for the given entity.
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*
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* @param object $entity
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* @return integer|float The generated value.
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* @override
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*/
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public function generate(EntityManager $em, $entity)
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{
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if ($this->_maxValue === null || $this->_nextValue == $this->_maxValue) {
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// Allocate new values
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$conn = $em->getConnection();
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$sql = $conn->getDatabasePlatform()->getSequenceNextValSQL($this->_sequenceName);
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$this->_nextValue = (int)$conn->fetchColumn($sql);
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$this->_maxValue = $this->_nextValue + $this->_allocationSize;
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}
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return $this->_nextValue++;
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}
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/**
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* Gets the maximum value of the currently allocated bag of values.
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*
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* @return integer|float
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*/
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public function getCurrentMaxValue()
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{
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return $this->_maxValue;
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}
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/**
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* Gets the next value that will be returned by generate().
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*
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* @return integer|float
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*/
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public function getNextValue()
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{
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return $this->_nextValue;
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}
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public function serialize()
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{
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return serialize(array(
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'allocationSize' => $this->_allocationSize,
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'sequenceName' => $this->_sequenceName
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));
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}
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public function unserialize($serialized)
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{
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$array = unserialize($serialized);
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$this->_sequenceName = $array['sequenceName'];
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$this->_allocationSize = $array['allocationSize'];
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}
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}
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