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kolab_sync_transaction_manager.php
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kolab_sync_transaction_manager.php
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<?php
/**
+--------------------------------------------------------------------------+
| Kolab Sync (ActiveSync for Kolab) |
| |
| Copyright (C) 2011-2012, Kolab Systems AG <contact@kolabsys.com> |
| Copyright (C) 2008-2012, Metaways Infosystems GmbH |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU Affero General Public License as published |
| by the Free Software Foundation, either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU Affero General Public License for more details. |
| |
| You should have received a copy of the GNU Affero General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/> |
+--------------------------------------------------------------------------+
| Author: Aleksander Machniak <machniak@kolabsys.com> |
| Author: Cornelius Weiss <c.weiss@metaways.de> |
+--------------------------------------------------------------------------+
*/
/**
* Transaction Manger for Syncroton
*
* This is the central class, all transactions within Syncroton must be handled with.
* For each supported transactionable (backend) this class start a real transaction on
* the first startTransaction request.
*
* Transactions of all transactionable will be commited at once when all requested transactions
* are being commited using this class.
*
* Transactions of all transactionable will be roll back when one rollBack is requested
* using this class.
*/
class kolab_sync_transaction_manager implements Syncroton_TransactionManagerInterface
{
/**
* @var array holds all transactionables with open transactions
*/
protected $_openTransactionables = array();
/**
* @var array list of all open (not commited) transactions
*/
protected $_openTransactions = array();
/**
* @var Syncroton_TransactionManager
*/
private static $_instance = NULL;
/**
* @var Zend_Log
*/
protected $_logger;
/**
* don't clone. Use the singleton.
*/
private function __clone()
{
}
/**
* constructor
*/
private function __construct()
{
if (Syncroton_Registry::isRegistered('loggerBackend')) {
$this->_logger = Syncroton_Registry::get('loggerBackend');
}
}
/**
* @return Tinebase_TransactionManager
*/
public static function getInstance()
{
if (self::$_instance === NULL) {
self::$_instance = new kolab_sync_transaction_manager;
}
return self::$_instance;
}
/**
* starts a transaction
*
* @param mixed $_transactionable
* @return string transactionId
* @throws Tinebase_Exception_UnexpectedValue
*/
public function startTransaction($_transactionable)
{
if ($this->_logger instanceof Zend_Log) {
$this->_logger->debug(__METHOD__ . '::' . __LINE__ . " startTransaction request");
}
if (! in_array($_transactionable, $this->_openTransactionables)) {
if ($_transactionable instanceof rcube_db) {
$_transactionable->startTransaction();
}
else {
$this->rollBack();
throw new Syncroton_Exception_UnexpectedValue('Unsupported transactionable!');
}
array_push($this->_openTransactionables, $_transactionable);
}
$transactionId = sha1(mt_rand(). microtime());
array_push($this->_openTransactions, $transactionId);
return $transactionId;
}
/**
* commits a transaction
*
* @param string $_transactionId
* @return void
*/
public function commitTransaction($_transactionId)
{
if ($this->_logger instanceof Zend_Log) {
$this->_logger->debug(__METHOD__ . '::' . __LINE__ . " commitTransaction request for $_transactionId");
}
$transactionIdx = array_search($_transactionId, $this->_openTransactions);
if ($transactionIdx !== false) {
unset($this->_openTransactions[$transactionIdx]);
}
$numOpenTransactions = count($this->_openTransactions);
if ($numOpenTransactions === 0) {
foreach ($this->_openTransactionables as $transactionable) {
if ($transactionable instanceof rcube_db) {
$transactionable->endTransaction();
}
}
$this->_openTransactionables = array();
$this->_openTransactions = array();
}
else {
if ($this->_logger instanceof Zend_Log) {
$this->_logger->debug(__METHOD__ . '::' . __LINE__ . " commiting defered, as there are still $numOpenTransactions in the queue");
}
}
}
/**
* perform rollBack on all transactionables with open transactions
*
* @return void
*/
public function rollBack()
{
if ($this->_logger instanceof Zend_Log) {
$this->_logger->debug(__METHOD__ . '::' . __LINE__ . " rollBack request, rollBack all transactionables");
}
foreach ($this->_openTransactionables as $transactionable) {
if ($transactionable instanceof rcube_db) {
$transactionable->rollbackTransaction();
}
}
$this->_openTransactionables = array();
$this->_openTransactions = array();
}
}

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