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AphrontDatabaseTransactionState.php
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Fri, Aug 9, 18:34

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 = 0;
private $readLockLevel = 0;
private $writeLockLevel = 0;
public function getDepth() {
return $this->depth;
}
public function increaseDepth() {
return ++$this->depth;
}
public function decreaseDepth() {
if ($this->depth == 0) {
throw new Exception(
'Too many calls to saveTransaction() or killTransaction()!');
}
return --$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("Too many calls to endReadLocking()!");
}
$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("Too many calls to endWriteLocking()!");
}
$this->writeLockLevel--;
return $this;
}
public function isWriteLocking() {
return ($this->writeLockLevel > 0);
}
public function __destruct() {
if ($this->depth) {
throw new Exception(
'Process exited with an open transaction! The transaction will be '.
'implicitly rolled back. Calls to openTransaction() must always be '.
'paired with a call to saveTransaction() or killTransaction().');
}
if ($this->readLockLevel) {
throw new Exception(
'Process exited with an open read lock! Call to beginReadLocking() '.
'must always be paired with a call to endReadLocking().');
}
if ($this->writeLockLevel) {
throw new Exception(
'Process exited with an open write lock! Call to beginWriteLocking() '.
'must always be paired with a call to endWriteLocking().');
}
}
}

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