/* | |
* Copyright (C) 2009 Google Inc. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are | |
* met: | |
* | |
* * Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* * Redistributions in binary form must reproduce the above | |
* copyright notice, this list of conditions and the following disclaimer | |
* in the documentation and/or other materials provided with the | |
* distribution. | |
* * Neither the name of Google Inc. nor the names of its | |
* contributors may be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* 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. | |
*/ | |
#include "config.h" | |
#include "SQLTransactionCoordinator.h" | |
#if ENABLE(DATABASE) | |
#include "CString.h" | |
#include "Database.h" | |
#include "SQLTransaction.h" | |
#include <wtf/Deque.h> | |
#include <wtf/HashMap.h> | |
#include <wtf/HashSet.h> | |
#include <wtf/RefPtr.h> | |
namespace WebCore { | |
static String getDatabaseIdentifier(SQLTransaction* transaction) | |
{ | |
Database* database = transaction->database(); | |
ASSERT(database); | |
return database->stringIdentifier(); | |
} | |
void SQLTransactionCoordinator::processPendingTransactions(CoordinationInfo& info) | |
{ | |
if (info.activeWriteTransaction || info.pendingTransactions.isEmpty()) | |
return; | |
RefPtr<SQLTransaction> firstPendingTransaction = info.pendingTransactions.first(); | |
if (firstPendingTransaction->isReadOnly()) { | |
do { | |
firstPendingTransaction = info.pendingTransactions.first(); | |
info.pendingTransactions.removeFirst(); | |
info.activeReadTransactions.add(firstPendingTransaction); | |
firstPendingTransaction->lockAcquired(); | |
} while (!info.pendingTransactions.isEmpty() && info.pendingTransactions.first()->isReadOnly()); | |
} else if (info.activeReadTransactions.isEmpty()) { | |
info.pendingTransactions.removeFirst(); | |
info.activeWriteTransaction = firstPendingTransaction; | |
firstPendingTransaction->lockAcquired(); | |
} | |
} | |
void SQLTransactionCoordinator::acquireLock(SQLTransaction* transaction) | |
{ | |
String dbIdentifier = getDatabaseIdentifier(transaction); | |
CoordinationInfoMap::iterator coordinationInfoIterator = m_coordinationInfoMap.find(dbIdentifier); | |
if (coordinationInfoIterator == m_coordinationInfoMap.end()) { | |
// No pending transactions for this DB | |
coordinationInfoIterator = m_coordinationInfoMap.add(dbIdentifier, CoordinationInfo()).first; | |
} | |
CoordinationInfo& info = coordinationInfoIterator->second; | |
info.pendingTransactions.append(transaction); | |
processPendingTransactions(info); | |
} | |
void SQLTransactionCoordinator::releaseLock(SQLTransaction* transaction) | |
{ | |
if (m_coordinationInfoMap.isEmpty()) | |
return; | |
String dbIdentifier = getDatabaseIdentifier(transaction); | |
CoordinationInfoMap::iterator coordinationInfoIterator = m_coordinationInfoMap.find(dbIdentifier); | |
ASSERT(coordinationInfoIterator != m_coordinationInfoMap.end()); | |
CoordinationInfo& info = coordinationInfoIterator->second; | |
if (transaction->isReadOnly()) { | |
ASSERT(info.activeReadTransactions.contains(transaction)); | |
info.activeReadTransactions.remove(transaction); | |
} else { | |
ASSERT(info.activeWriteTransaction == transaction); | |
info.activeWriteTransaction = 0; | |
} | |
processPendingTransactions(info); | |
} | |
void SQLTransactionCoordinator::shutdown() | |
{ | |
// Notify all transactions in progress that the database thread is shutting down | |
for (CoordinationInfoMap::iterator coordinationInfoIterator = m_coordinationInfoMap.begin(); | |
coordinationInfoIterator != m_coordinationInfoMap.end(); ++coordinationInfoIterator) { | |
CoordinationInfo& info = coordinationInfoIterator->second; | |
if (info.activeWriteTransaction) | |
info.activeWriteTransaction->notifyDatabaseThreadIsShuttingDown(); | |
for (HashSet<RefPtr<SQLTransaction> >::iterator activeReadTransactionsIterator = | |
info.activeReadTransactions.begin(); | |
activeReadTransactionsIterator != info.activeReadTransactions.end(); | |
++activeReadTransactionsIterator) { | |
(*activeReadTransactionsIterator)->notifyDatabaseThreadIsShuttingDown(); | |
} | |
} | |
// Clean up all pending transactions for all databases | |
m_coordinationInfoMap.clear(); | |
} | |
} // namespace WebCore | |
#endif // ENABLE(DATABASE) |