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/*
* Copyright (C) 2010 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:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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.
*/
#ifndef IDBTransactionCoordinator_h
#define IDBTransactionCoordinator_h
#if ENABLE(INDEXED_DATABASE)
#include <memory>
#include <wtf/HashMap.h>
#include <wtf/ListHashSet.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class IDBTransactionBackend;
// Transactions are executed in the order the were created.
class IDBTransactionCoordinator {
public:
IDBTransactionCoordinator();
virtual ~IDBTransactionCoordinator();
// Called by transactions as they start and finish.
void didCreateTransaction(IDBTransactionBackend*);
void didOpenBackingStoreTransaction(IDBTransactionBackend*);
void didStartTransaction(IDBTransactionBackend*);
void didFinishTransaction(IDBTransactionBackend*);
#ifndef NDEBUG
bool isActive(IDBTransactionBackend*);
#endif
private:
void processStartedTransactions();
bool canRunTransaction(IDBTransactionBackend*);
// This is just an efficient way to keep references to all transactions.
HashMap<IDBTransactionBackend*, RefPtr<IDBTransactionBackend> > m_transactions;
// Transactions in different states are grouped below.
ListHashSet<IDBTransactionBackend*> m_queuedTransactions;
HashSet<IDBTransactionBackend*> m_startedTransactions;
};
} // namespace WebCore
#endif // ENABLE(INDEXED_DATABASE)
#endif // IDBTransactionCoordinator_h
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